Ford Ecosport Owners and Service Manuals

Ford Ecosport: Front Seats / Diagnosis and Testing - Front Seats

Ford Ecosport 2014-2024 Service and Repair Manual / Body and Paint / Front Seats / Diagnosis and Testing - Front Seats

DTC Chart: HVAC Module

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).


  HVAC Module DTC Chart


  DTC Description Action
B1034:11 Left Front Seat Heater Element: Circuit Short To Ground   GO to Pinpoint Test C
B1034:12 Left Front Seat Heater Element: Circuit Short To Battery   GO to Pinpoint Test C
B1034:13 Left Front Seat Heater Element: Circuit Open   GO to Pinpoint Test C
B1034:15 Left Front Seat Heater Element: Circuit Short To Battery or Open   GO to Pinpoint Test C
B1036:11 Right Front Seat Heater Element: Circuit Short To Ground   GO to Pinpoint Test D
B1036:12 Right Front Seat Heater Element: Circuit Short To Battery   GO to Pinpoint Test D
B1036:13 Right Front Seat Heater Element: Circuit Open   GO to Pinpoint Test D
B1036:15 Right Front Seat Heater Element: Circuit Short To Battery or Open   GO to Pinpoint Test D
B1038:11 Left Front Seat Heater Sensor: Circuit Short To Ground   GO to Pinpoint Test C
B1038:15 Left Front Seat Heater Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test C
B103A:11 Right Front Seat Heater Sensor: Circuit Short To Ground   GO to Pinpoint Test D
B103A:15 Right Front Seat Heater Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test D
All other Diagnostic Trouble Codes (DTCs) -   Refer to the appropriate section in Group 412 for the procedure.

Symptom Chart(s)

Symptom Chart: Front Seats

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).


  Symptom Chart


Condition Possible Sources Actions
No communication with the HVAC module
  • Refer to the Pinpoint Test

  • REFER to: Communications Network (418-00 Module Communications Network) .
The power seat is inoperative or does not operate correctly - driver
  • Refer to the Pinpoint Test
  • GO to Pinpoint Test A
The heated seats are inoperative — driver and passenger
  • Refer to the Pinpoint Test
  • GO to Pinpoint Test B
The heated seat is inoperative/does not operate correctly — driver
  • Refer to the Pinpoint Test
  • GO to Pinpoint Test C
The heated seat is inoperative/does not operate correctly — passenger
  • Refer to the Pinpoint Test
  • GO to Pinpoint Test D

Pinpoint Tests


PINPOINT TEST A: THE POWER SEAT IS INOPERATIVE OR DOES NOT OPERATE CORRECTLY - DRIVER

Refer to Wiring Diagrams Cell 120 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Front Seats - System Operation and Component Description (501-10A Front Seats, Description and Operation).

Possible Sources

  • Fuse
  • Wiring, terminals or connectors
  • Seat control switch
  • Seat backrest assembly
  • Seat track

Visual Inspection and Pre-checks

  • Verify BJB fuse 5 (30A) is OK.

  WARNING: Incorrect repair techniques or actions can cause an accidental Supplemental Restraint System (SRS) deployment. Never compromise or depart from these instructions. Failure to precisely follow all instructions could result in serious personal injury from an accidental deployment.

A1 CHECK THE SEAT OPERATION
  • Ignition OFF.
  • Attempt to operate the seat in all directions.

Is the seat inoperative in all directions?
Yes GO to A2
No If only the recliner motor is inoperative, GO to A4
If only the horizontal motor is inoperative, GO to A6
If only the vertical height motor is inoperative, GO to A8

A2 CHECK FOR VOLTAGE TO THE POWER SEAT SWITCH

  • REFER to: Supplemental Restraint System (SRS) Depowering (501-20B Supplemental Restraint System, General Procedures).
  • Disconnect: Driver Side Airbag C3050.
  • Disconnect: Power Seat Switch C3387B.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3387B-2   Ground

Is the voltage greater than 11 volts?
Yes GO to A3
No VERIFY the BJB fuse 5 (30A) is OK. If OK, REPAIR the affected circuit. If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short. GO to A10

A3 CHECK THE POWER SEAT SWITCH GROUND CIRCUIT
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3387B-1   Ground

Is the resistance less than 3 ohms?
Yes INSTALL a new seat control switch.
REFER to: Front Seat Control Switch (501-10A Front Seats, Removal and Installation).
GO to A10
No REPAIR the circuit. GO to A10

A4 CHECK FOR VOLTAGE TO THE DRIVER SEAT RECLINER MOTOR

  • REFER to: Supplemental Restraint System (SRS) Depowering (501-20B Supplemental Restraint System, General Procedures).
  • Disconnect: Driver Side Airbag C3050.
  • Disconnect: Driver Seat Recliner Motor C3187.
  • NOTE: The voltage being measured changes polarity dependent upon which direction the seat control switch is activated. Measure while pushing the recline switch forward and rearward:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3187-1   C3187-3

Is the voltage greater than 11 volts when the seat control switch is operated in both directions and 0 volt in the rest position?
Yes INSTALL a new seat backrest frame assembly. GO to A10
No GO to A5

A5 CHECK THE DRIVER SEAT RECLINER MOTOR CIRCUIT FOR AN OPEN
  • Disconnect: Power Seat Switch C3387A.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3387A-1   C3187-1
      C3387A-2   C3187-3

Is the resistance less than 3 ohms for both measurements?
Yes INSTALL a new seat control switch.
REFER to: Front Seat Control Switch (501-10A Front Seats, Removal and Installation).
GO to A10
No REPAIR the circuit. GO to A10

A6 CHECK FOR VOLTAGE TO THE DRIVER SEAT HORIZONTAL MOTOR

  • REFER to: Supplemental Restraint System (SRS) Depowering (501-20B Supplemental Restraint System, General Procedures).
  • Disconnect: Driver Side Airbag C3050.
  • Disconnect: Driver Seat Horizontal Motor C3833.
  • NOTE: The voltage being measured changes polarity dependent upon which direction the seat control switch is activated. Measure pushing the power seat switch forward and rearward:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3833-1   C3833-3

Is the voltage greater than 11 volts when the seat control switch is operated in both directions and 0 volt in the rest position?
Yes INSTALL a new seat track assembly.
REFER to: Front Seat Track (501-10A Front Seats, Removal and Installation).
GO to A10
No GO to A7

A7 CHECK THE HORIZONTAL MOTOR CIRCUITS FOR AN OPEN CIRCUIT
  • Disconnect: Power Seat Control Switch C3387D.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3387D-1   C3833-1
      C3387D-2   C3833-3

Is the resistance less than 3 ohms for both measurements?
Yes INSTALL a new seat control switch.
REFER to: Front Seat Control Switch (501-10A Front Seats, Removal and Installation).
GO to A10
No REPAIR the circuit. GO to A10

A8 CHECK VOLTAGE TO THE DRIVER SEAT HEIGHT MOTOR

  • REFER to: Supplemental Restraint System (SRS) Depowering (501-20B Supplemental Restraint System, General Procedures).
  • Disconnect: Driver Side Airbag C3050.
  • Disconnect: Driver Seat Height Motor C3074.
  • NOTE: The voltage being measured changes polarity dependent upon which direction the seat control switch is activated. Measure while pressing the rear height adjust switch up and down:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3074-1   C3074-3

Is the voltage greater than 11 volts when the seat control switch is operated in both directions and 0 volt in the rest position?
Yes INSTALL a new seat track assembly.
REFER to: Front Seat Track (501-10A Front Seats, Removal and Installation).
GO to A10
No GO to A9

A9 CHECK THE DRIVER SEAT HEIGHT MOTOR CIRCUIT FOR AN OPEN
  • Disconnect: Power Seat Switch C3387C.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3387C-1   C3074-1
      C3387C-2   C3074-3

Is the resistance less than 3 ohms for both measurements?
Yes INSTALL a new seat control switch.
REFER to: Front Seat Control Switch (501-10A Front Seats, Removal and Installation).
GO to A10
No REPAIR the circuit. GO to A10

A10 VERIFY THE SRS (SUPPLEMENTAL RESTRAINT SYSTEM) PROVES OUT SUCCESSFULLY

  • REFER to: Supplemental Restraint System (SRS) Depowering (501-20B Supplemental Restraint System, General Procedures).
  • Connect: Driver Side Airbag C3050.
  • Connect all previously disconnected connectors.

  • REFER to: Supplemental Restraint System (SRS) Repowering (501-20B Supplemental Restraint System, General Procedures).

Did the SRS prove out successfully?
Yes The repair is complete. RETURN the vehicle to the customer.
No
REFER to: Airbag Supplemental Restraint System (SRS) - Vehicles With: Rear Seat Side Airbag (501-20B Supplemental Restraint System, Diagnosis and Testing).

PINPOINT TEST B: THE HEATED SEATS ARE INOPERATIVE — DRIVER AND PASSENGER

Refer to Wiring Diagrams Cell 119 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Front Seats - System Operation and Component Description (501-10A Front Seats, Description and Operation).

Possible Sources

  • Fuse
  • Wiring, terminals or connectors
  • HVAC module

Visual Inspection and Pre-checks

  • Verify the BJB fuse 60 (20A) (Mexico) or 40 (25A) (United States and Canada) is OK.
B1 CHECK FOR HVAC (HEATING, VENTILATION AND AIR CONDITIONING) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, perform HVAC module self-test.

Are any HVAC module Diagnostic Trouble Codes (DTCs) present?
Yes REFER to the HVAC Module DTC Chart in this section.
No GO to B2

B2 CHECK THE HEATED SEAT VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect: HVAC Module C228B.
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228B-1   Ground

Is the voltage greater than 11 volts?
Yes GO to B3
No VERIFY BJB fuse 60 (20A) (Mexico) or 40 (25A) (United States and Canada) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

B3 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all of the HVAC module connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins as necessary
    • pushed-out pins - install new pins as necessary
  • Reconnect the HVAC module connectors. Make sure they seat and latch correctly.
  • Reconnect all previously disconnected connectors.
  • Ignition ON.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new HVAC module . Refer to the appropriate section in Group 412 for the procedure.
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST C: THE HEATED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY — DRIVER

Refer to Wiring Diagrams Cell 119 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Front Seats - System Operation and Component Description (501-10A Front Seats, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC B1034:11 Left Front Seat Heater Element: Circuit Short To Ground Sets when the HVAC module senses the left front heater element current draw has exceeded a specified threshold. When this DTC sets, the HVAC module disables the circuit until the ignition is cycled.
HVAC B1034:12 Left Front Seat Heater Element: Circuit Short To Battery Sets when the HVAC module senses the left front heater circuit voltage is above a specified threshold when the driver is active. When this DTC sets, the HVAC module disables the circuit until the ignition is cycled.
HVAC B1034:13 Left Front Seat Heater Element: Circuit Open Sets when the HVAC module senses the left front heater element current draw is less than a specified threshold. When this DTC sets, the HVAC module disables the circuit until the ignition is cycled.
HVAC B1034:15 Left Front Seat Heater Element: Circuit Short To Battery Or Open Sets when the HVAC module senses the left front heater circuit voltage is above a specified threshold when the driver is active or the left front heater element current draw is less than a specified threshold. When this DTC sets, the HVAC module disables the circuit until the ignition is cycled.
HVAC B1038:11 Left Front Seat Heater Sensor: Circuit Short To Ground Sets when the HVAC module senses the left front heater sensor voltage is out-of-range low. When this DTC sets, the HVAC module disables the circuit until the ignition is cycled.
HVAC B1038:15 Left Front Seat Heater Sensor: Circuit Short To Battery Or Open Sets when the HVAC module senses the left front heater sensor voltage is out-of-range high. When this DTC sets, the HVAC module disables the circuit until the ignition is cycled.

Possible Sources

  • Wiring, terminals or connectors
  • Heater mat
  • HVAC module

  WARNING: Incorrect repair techniques or actions can cause an accidental Supplemental Restraint System (SRS) deployment. Never compromise or depart from these instructions. Failure to precisely follow all instructions could result in serious personal injury from an accidental deployment.

C1 CHECK FOR HVAC (HEATING, VENTILATION AND AIR CONDITIONING) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, perform HVAC module self-test.

Are any HVAC module Diagnostic Trouble Codes (DTCs) present?
Yes For DTC B1034:11, B1034:12, B1034:13 or B1034:15, GO to C3
For DTC B1038:11 or B1038:15, GO to C4
For all other Diagnostic Trouble Codes (DTCs), REFER to the HVAC Module DTC Chart.
No GO to C2

C2 CHECK THE HEATED SEAT VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect: HVAC Module C228B.
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228B-1   Ground

Is the voltage greater than 11 volts?
Yes GO to C3
No REPAIR the circuit.

C3 CHECK THE HEATER ELEMENT POWER CIRCUIT FOR AN OPEN OR SHORT TO GROUND

  • REFER to: Supplemental Restraint System (SRS) Depowering (501-20B Supplemental Restraint System, General Procedures).
  • Disconnect: Driver Side Airbag C3050.
  • Disconnect: HVAC Module C228B (if not previously disconnected).
  • Disconnect: Left Front Seat Cushion Heater C3035.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3035-1   Ground
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3035-1   C228B-16

Is the resistance greater than 10,000 ohms between the driver seat cushion heater mat and ground; and less than 3 ohms between the driver seat cushion heater mat and the HVAC module?
Yes GO to C7
No REPAIR the circuit. GO to C13

C4 CHECK THE HEATED SEAT TEMPERATURE SENSOR CIRCUIT FOR AN OPEN OR SHORT TO GROUND

  • REFER to: Supplemental Restraint System (SRS) Depowering (501-20B Supplemental Restraint System, General Procedures).
  • Disconnect: Driver Side Airbag C3050.
  • Disconnect: HVAC module C228B.
  • Disconnect: Left Front Seat Cushion Heater C3035.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3035-2   Ground
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3035-2   C228B-30

Is the resistance greater than 10,000 ohms between the driver seat cushion heater mat and ground; and less than 3 ohms between the driver seat cushion heater mat and the HVAC module?
Yes GO to C5
No REPAIR the circuit. GO to C13

C5 CHECK THE HEATED SEAT TEMPERATURE SENSOR RETURN CIRCUIT FOR AN OPEN OR SHORT TO GROUND
  • Disconnect: HVAC Module C228A.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3035-3   Ground
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3035-3   C228A-2

Is the resistance greater than 10,000 ohms between the driver seat cushion heater mat and ground; and less than 3 ohms between the driver seat cushion heater mat and the HVAC module?
Yes GO to C6
No REPAIR the circuit. GO to C13

C6 CHECK THE HEATED SEAT TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO VOLTAGE
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3035-2   Ground

Is any voltage present?
Yes REPAIR the circuit. GO to C13
No GO to C11

C7 CHECK THE HEATER ELEMENT GROUND CIRCUIT FOR AN OPEN
  • Disconnect: Left Front Seat Backrest Heater C3034.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3034-2   Ground

Is the resistance less than 0.5 ohm?
Yes GO to C8
No REPAIR the circuit. GO to C13

C8 CHECK THE CUSHION HEATED SEAT MAT FOR AN OPEN OR SHORT TO GROUND
  • Measure the component side resistance between:
    Positive Lead Measurement / Action Negative Lead
    C3035-1, Component Side C3035-4, Component Side
    C3035-1, Component Side Ground

Is the resistance between 0.6 and 2 ohms between pins 1 and 4; and greater than 10,000 ohms between pin 1 and ground?
Yes GO to C9
No INSTALL a new driver seat cushion heater mat.
REFER to: Seat Heater Mat Removal (501-10A Front Seats, General Procedures).
GO to C13

C9 CHECK THE BACKREST HEATED SEAT MAT FOR AN OPEN OR SHORT TO GROUND
  • Measure the component side resistance between:
    Positive Lead Measurement / Action Negative Lead
    C3034-1, Component Side C3034-2, Component Side
    C3034-2, Component Side Ground

Is the resistance between 0.6 and 2 ohms between pins 1 and 2; and greater than 10,000 ohms between pin 2 and ground?
Yes GO to C10
No INSTALL a new driver seat backrest heater mat.
REFER to: Seat Heater Mat Removal (501-10A Front Seats, General Procedures).
GO to C13

C10 CHECK THE CIRCUIT BETWEEN THE CUSHION HEATER MAT AND BACKREST HEATER MAT FOR AN OPEN AND SHORT TO GROUND
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3035-4   Ground
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3035-4   C3034-1

Is the resistance greater than 10,000 ohms between the driver seat cushion heater mat and ground; and less than 3 ohms between the driver seat cushion heater mat and the backrest heater mat?
Yes GO to C12
No REPAIR the circuit. GO to C13

C11 CHECK THE HEATED SEAT TEMPERATURE SENSOR FOR AN OPEN OR SHORT TO GROUND
  • Measure the component side resistance between:
    Positive Lead Measurement / Action Negative Lead
    C3035-2, Component Side C3035-3, Component Side
    C3035-2, Component Side Ground

Is the resistance between 300 and 300,000 ohms between pins 2 and 3; and greater than 10,000 ohms between pin 2 and ground?
Yes GO to C12
No INSTALL a new driver seat cushion heater mat.
REFER to: Seat Heater Mat Removal (501-10A Front Seats, General Procedures).
GO to C13

C12 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all of the HVAC module connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins as necessary
    • pushed-out pins - install new pins as necessary
  • Reconnect the HVAC module connectors. Make sure they seat and latch correctly.
  • Reconnect all previously disconnected connectors.
  • Ignition ON.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new HVAC module. Refer to the appropriate section in Group 412 for the procedure. GO to C13
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues. GO to C13

C13 VERIFY THE SRS (SUPPLEMENTAL RESTRAINT SYSTEM) PROVES OUT SUCCESSFULLY

  • REFER to: Supplemental Restraint System (SRS) Depowering (501-20B Supplemental Restraint System, General Procedures).
  • Connect: Driver Side Airbag C3050.
  • Connect all previously disconnected connectors.

  • REFER to: Supplemental Restraint System (SRS) Repowering (501-20B Supplemental Restraint System, General Procedures).

Did the SRS prove out successfully?
Yes Repair is complete. RETURN the vehicle to the customer.
No
REFER to: Airbag Supplemental Restraint System (SRS) - Vehicles Without: Rear Seat Side Airbag (501-20B Supplemental Restraint System, Diagnosis and Testing).

PINPOINT TEST D: THE HEATED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY — PASSENGER

Refer to Wiring Diagrams Cell 119 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Front Seats - System Operation and Component Description (501-10A Front Seats, Description and Operation).

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
HVAC B1036:11 Right Front Seat Heater Element: Circuit Short To Ground Sets when the HVAC module senses the right front heater element current draw has exceeded a specified threshold. When this DTC sets, the HVAC module disables the circuit until the ignition is cycled.
HVAC B1036:12 Right Front Seat Heater Element: Circuit Short To Battery Sets when the HVAC module senses the right front heater circuit voltage is above a specified threshold when the driver is active. When this DTC sets, the HVAC module disables the circuit until the ignition is cycled.
HVAC B1036:13 Right Front Seat Heater Element: Circuit Open Sets when the HVAC module senses the right front heater element current draw is less than a specified threshold. When this DTC sets, the HVAC module disables the circuit until the ignition is cycled.
HVAC B1036:15 Right Front Seat Heater Element: Circuit Short To Battery Or Open Sets when the HVAC module senses the right front heater circuit voltage is above a specified threshold when the driver is active or the right front heater element current draw is less than a specified threshold. When this DTC sets, the HVAC module disables the circuit until the ignition is cycled.
HVAC B103A:11 Right Front Seat Heater Sensor: Circuit Short To Ground Sets when the HVAC module senses the right front heater sensor voltage is out-of-range low. When this DTC sets, the HVAC module disables the circuit until the ignition is cycled.
HVAC B103A:15 Right Front Seat Heater Sensor: Circuit Short To Battery Or Open Sets when the HVAC module senses the right front heater sensor voltage is out-of-range high. When this DTC sets, the HVAC module disables the circuit until the ignition is cycled.

Possible Sources

  • Wiring, terminals or connectors
  • Heater mat
  • HVAC module

  WARNING: Incorrect repair techniques or actions can cause an accidental Supplemental Restraint System (SRS) deployment. Never compromise or depart from these instructions. Failure to precisely follow all instructions could result in serious personal injury from an accidental deployment.

D1 CHECK FOR HVAC (HEATING, VENTILATION AND AIR CONDITIONING) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition ON.
  • Using a diagnostic scan tool, perform HVAC module self-test.

Are any HVAC module Diagnostic Trouble Codes (DTCs) present?
Yes For DTC B1036:11, B1036:12, B1036:13 or B1036:15, GO to D3
For DTC B103A:11 or B103A:15, GO to D4
For all other Diagnostic Trouble Codes (DTCs), REFER to the HVAC Module DTC Chart.
No GO to D2

D2 CHECK THE HEATED SEAT VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect: HVAC Module C228B.
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C228B-1   Ground

Is the voltage greater than 11 volts?
Yes GO to D3
No REPAIR the circuit.

D3 CHECK THE HEATER ELEMENT POWER CIRCUIT FOR AN OPEN OR SHORT TO GROUND

  • REFER to: Supplemental Restraint System (SRS) Depowering (501-20B Supplemental Restraint System, General Procedures).
  • Disconnect: Passenger Side Airbag C3329.
  • Disconnect: HVAC Module C228B.
  • Disconnect: Right Front Seat Cushion Heater C3040.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3040-1   Ground
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3040-1   C228B-17

Is the resistance greater than 10,000 ohms between the passenger seat cushion heater mat and ground; and less than 3 ohms between the passenger seat cushion heater mat and the HVAC module?
Yes GO to D7
No REPAIR the circuit. GO to D13

D4 CHECK THE HEATED SEAT TEMPERATURE SENSOR CIRCUIT FOR AN OPEN OR SHORT TO GROUND

  • REFER to: Supplemental Restraint System (SRS) Depowering (501-20B Supplemental Restraint System, General Procedures).
  • Disconnect: Passenger Side Airbag C3329.
  • Disconnect: HVAC Module C228B.
  • Disconnect: Right Front Seat Cushion Heater C3040.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3040-2   Ground
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3040-2   C228B-15

Is the resistance greater than 10,000 ohms between the passenger seat cushion heater mat and ground; and less than 3 ohms between the passenger seat cushion heater mat and the HVAC module?
Yes GO to D5
No REPAIR the circuit. GO to D13

D5 CHECK THE HEATED SEAT TEMPERATURE SENSOR RETURN CIRCUIT FOR AN OPEN OR SHORT TO GROUND
  • Disconnect: HVAC Module C228A.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3040-3   Ground
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3040-3   C228A-2

Is the resistance greater than 10,000 ohms between the passenger seat cushion heater mat and ground; and less than 3 ohms between the passenger seat cushion heater mat and the HVAC module?
Yes GO to D6
No REPAIR the circuit. GO to D13

D6 CHECK THE HEATED SEAT TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO VOLTAGE
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3040-2   Ground

Is any voltage present?
Yes REPAIR the circuit. GO to D13
No GO to D11

D7 CHECK THE HEATER ELEMENT GROUND CIRCUIT FOR AN OPEN
  • Disconnect: Right Front Seat Backrest Heater C3039.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3039-2   Ground

Is the resistance less than 0.5 ohm?
Yes GO to D8
No REPAIR the circuit. GO to D13

D8 CHECK CUSHION HEATED SEAT MAT FOR AN OPEN OR SHORT TO GROUND
  • Measure the component side resistance between:
    Positive Lead Measurement / Action Negative Lead
    C3040-1, Component Side C3040-4, Component Side
    C3040-1, Component Side Ground

Is the resistance between 0.6 and 2 ohms between pins 1 and 4; and greater than 10,000 ohms between pin 1 and ground?
Yes GO to D9
No INSTALL a new passenger seat cushion heater mat.
REFER to: Seat Heater Mat Removal (501-10A Front Seats, General Procedures).
GO to D13

D9 CHECK THE BACKREST HEATED SEAT MAT FOR AN OPEN OR SHORT TO GROUND
  • Measure the component side resistance between:
    Positive Lead Measurement / Action Negative Lead
    C3039-1, Component Side C3039-2, Component Side
    C3039-2, Component Side Ground

Is the resistance between 0.6 and 2 ohms between pins 1 and 2; and greater than 10,000 ohms between pin 2 and ground?
Yes GO to D10
No INSTALL a new passenger seat backrest heater mat.
REFER to: Seat Heater Mat Removal (501-10A Front Seats, General Procedures).
GO to D13

D10 CHECK THE CIRCUIT BETWEEN THE CUSHION HEATER MAT AND BACKREST HEATER MAT FOR AN OPEN AND SHORT TO GROUND
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3040-4   Ground
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C3040-4   C3039-1

Is the resistance greater than 10,000 ohms between the passenger seat cushion heater mat and ground; and less than 3 ohms between the passenger seat cushion heater mat and the backrest heater mat?
Yes GO to D12
No REPAIR the circuit. GO to D13

D11 CHECK THE HEATED SEAT TEMPERATURE SENSOR FOR AN OPEN OR SHORT TO GROUND
  • Measure the component side resistance between:
    Positive Lead Measurement / Action Negative Lead
    C3040-2, Component Side C3040-3, Component Side
    C3040-2, Component Side Ground

Is the resistance between 300 and 300,000 ohms between pins 2 and 3; and greater than 10,000 ohms between pin 2 and ground?
Yes GO to D12
No INSTALL a new passenger seat cushion heater mat.
REFER to: Seat Heater Mat Removal (501-10A Front Seats, General Procedures).
GO to D13

D12 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) MODULE OPERATION
  • Ignition OFF.
  • Disconnect and inspect all of the HVAC module connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins as necessary
    • pushed-out pins - install new pins as necessary
  • Reconnect the HVAC module connectors. Make sure they seat and latch correctly.
  • Reconnect all previously disconnected connectors.
  • Ignition ON.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes
CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new HVAC module. Refer to the appropriate section in Group 412 for the procedure. GO to D13
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues. GO to D13

D13 VERIFY THE SRS (SUPPLEMENTAL RESTRAINT SYSTEM) PROVES OUT SUCCESSFULLY

  • REFER to: Supplemental Restraint System (SRS) Depowering (501-20B Supplemental Restraint System, General Procedures).
  • Connect: Passenger Side Airbag C3329.
  • Connect all previously disconnected connectors.

  • REFER to: Supplemental Restraint System (SRS) Repowering (501-20B Supplemental Restraint System, General Procedures).

Did the SRS prove out successfully?
Yes Repair is complete. RETURN the vehicle to the customer.
No
REFER to: Airbag Supplemental Restraint System (SRS) - Vehicles Without: Rear Seat Side Airbag (501-20B Supplemental Restraint System, Diagnosis and Testing).


    Description and Operation - Front Seats - System Operation and Component Description

    System Operation Heated Seats The driver and passenger heated seat control buttons and indicators are located on the HVAC module. The heated seat system functions independently from the climate control system...

    General Procedures - Seat Heater Mat Installation

    Repair NOTE: Click here to view a video version of the seat heater mat removal and installation. View NOTE: Always install a new heater mat...

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