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) |
-
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.
|
|
C2 CHECK THE HEATED SEAT VOLTAGE SUPPLY CIRCUIT FOR AN OPEN |
-
Disconnect: HVAC Module C228B.
-
Measure:
Click to display connectors
Positive Lead
|
Measurement / Action
|
Negative Lead
|
C228B-1
|
|
Ground
|
Is the voltage greater than 11 volts?
|
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?
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?
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?
No |
REPAIR the circuit. GO to C13
|
|
C6 CHECK THE HEATED SEAT TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO VOLTAGE |
-
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
|
|
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?
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?
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?
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?
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?
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 |
-
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.
-
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).
|
|