Ford Ecosport Owners and Service Manuals

Ford Ecosport: Rear View Mirrors / Diagnosis and Testing - Rear View Mirrors

Ford Ecosport 2014-2024 Service and Repair Manual / Body and Paint / Rear View Mirrors / Diagnosis and Testing - Rear View Mirrors


Refer to Wiring Diagrams Cell 124 for schematic and connector information.

Symptom Chart(s)

Symptom Chart: Rear View Mirrors - Exterior

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.

NOTE: Clean the entire mirror assembly and glass to assist in verification of the customer concern and/or impact damage. Do not clean any mirror glass or housing with an ice scraper, razor blade, abrasive pad, harsh chemicals or petroleum based cleaning products, as these may damage the mirror glass and/or housing.

Condition Possible Causes Action
One or both exterior mirror(s) fold inward due to wind pressure Mirror structural bracket is damaged INSPECT the mirror for structural damage. If necessary, INSTALL a new mirror.
REFER to: Exterior Mirror (501-09 Rear View Mirrors, Removal and Installation).
The LH or RH exterior mirror selection switch LED is inoperative (exterior mirror selection switch functions normally) Exterior mirror selection switch INSTALL a new front door window control switch.
REFER to: Driver Door Window Control Switch (501-11 Glass, Frames and Mechanisms, Removal and Installation).
Both exterior rear view mirrors are inoperative Refer to Pinpoint Test   GO to Pinpoint Test A
A single exterior rear view mirror is inoperative Refer to Pinpoint Test   GO to Pinpoint Test B
A single exterior rear view mirror does not operate correctly with switch logic Refer to Pinpoint Test   GO to Pinpoint Test C
Both exterior mirrors are inoperative
  • Wiring, terminals or connectors
  • Power window concern
  • Fuse
  • Exterior mirror control switch (integral to the front door window control switch)
  • VERIFY that all power windows can be operated normally from the LH front door window control switch.
    • If all power windows operate normally from the LH front door window control switch, INSTALL a new LH front door window control switch.
      REFER to: Driver Door Window Control Switch (501-11 Glass, Frames and Mechanisms, Removal and Installation).
    • If all power window do not operate normally from the LH front door window control switch, DIAGNOSE the power windows before continuing diagnostics of the exterior mirrors.
      REFER to: Glass, Frames and Mechanisms (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing).
One or both heated exterior mirrors are inoperative Refer to the Pinpoint Test   GO to Pinpoint Test D
Both heated exterior mirrors are always on Refer to the Pinpoint Test DIAGNOSE the rear window defrost system.
REFER to: Glass, Frames and Mechanisms (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing).
The LH or RH heated exterior mirrors do not defrost at the same rate Normal operation of the heated exterior mirror No action required, the system is operating correctly at this time.
The exterior mirror turn indicator is inoperative or always on
  • Wiring, terminals or connectors
  • Communication concern
  • Turn indicator
  • Door module
  • BCM
 
REFER to: Turn Signal and Hazard Lamps (417-01) .
The Blind Spot Information System (BLIS®) indicator is inoperative or always on (if equipped)
  • Wiring, terminals or connectors
  • Exterior mirror glass
  • Side obstacle detection control module
 
REFER to: Blind Spot Information System (419-04) .

Symptom Chart: Rear View Mirrors - Interior

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.

NOTE: Clean the entire mirror assembly and glass to assist in verification of the customer concern and/or impact damage. Do not clean any mirror glass or housing with an ice scraper, razor blade, abrasive pad, harsh chemicals or petroleum based cleaning products, as these may damage the mirror glass and/or housing.

Condition Possible Causes Action
The interior mirror is blemished Interior mirror glass/housing is dirty CLEAN the affected interior mirror surface.
The interior mirror is damaged INSPECT the interior mirror damage. If needed, INSTALL a new interior rear view mirror.
REFER to: Exterior Mirror (501-09 Rear View Mirrors, Removal and Installation).
The interior mirror vibrates or is loose Interior mirror mounting loose If the mirror is still on the windshield, do not remove. ATTEMPT to fully seat the mirror first. If the mirror is still loose or vibrates, REMOVE and REINSTALL the mirror. If the condition still exists, INSTALL a new interior mirror.
REFER to: Interior Rear View Mirror (501-09 Rear View Mirrors, Removal and Installation).
The interior auto-dimming mirror does not operate correctly Refer to the Pinpoint Test   GO to Pinpoint Test E

Symptom Chart: Rear View Mirrors - Exterior NVH

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.

NOTE: Clean the entire mirror assembly and glass to assist in verification of the customer concern and/or impact damage. Do not clean any mirror glass or housing with an ice scraper, razor blade, abrasive pad, harsh chemicals or petroleum based cleaning products, as these may damage the mirror glass and/or housing.

Condition Possible Causes Action
Exterior mirror housing vibrates or is loose
  • Exterior mirror mounting nuts loose
TIGHTEN the exterior mirror mounting nuts.
REFER to: Exterior Mirror (501-09 Rear View Mirrors, Removal and Installation).
  • Aftermarket air deflector/stone shields
If possible, REMOVE the aftermarket parts and ROAD TEST the vehicle. If the concern is no longer present, ADVISE the customer that the aftermarket components were causing the undesired vibration.
Exterior mirror glass vibrates or is loose
  • Exterior mirror motor mounting screws loose
  • Exterior mirror glass loose
PRESS the center of the exterior mirror glass up, down, left and right to make sure the exterior mirror glass is seated correctly. If the exterior mirror glass is still loose, REMOVE the exterior mirror glass. INSPECT the exterior mirror backing plate for damage. INSPECT the exterior mirror motor mounting screws and TIGHTEN if necessary. If the exterior mirror backing plate is damaged, INSTALL a new exterior mirror glass.
REFER to: Exterior Mirror (501-09 Rear View Mirrors, Removal and Installation).
Wind noise Foam gasket between exterior mirror housing and door is misaligned or damaged VERIFY the gasket is in good condition. If necessary, REPOSITION the gasket between the exterior mirror housing and the door. The foam gasket is not serviceable and if it cannot be repaired, INSTALL a new exterior mirror.
REFER to: Exterior Mirror (501-09 Rear View Mirrors, Removal and Installation).
Exterior mirror is not correctly fitted to the door VERIFY there are no gaps between the exterior mirror and the door. If necessary, LOOSEN the exterior mirror nuts and REPOSITION the exterior mirror as necessary.
REFER to: Exterior Mirror (501-09 Rear View Mirrors, Removal and Installation).
Exterior mirror impact damage INSPECT the exterior mirror to ensure that there is no damage to the housing or glass.

Pinpoint Tests


PINPOINT TEST A: BOTH EXTERIOR MIRRORS ARE INOPERATIVE

Refer to Wiring Diagrams Cell 124 for schematic and connector information.

Normal Operation and Fault Conditions

The exterior mirror control switch receives voltage at all times from the CJB . The exterior mirror control switch has only one ground circuit. The exterior mirrors share a common circuit for both up/down and right/left movements.

Possible Sources

  • Fuse
  • Wiring, terminals or connectors
  • Exterior mirror control switch

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

A1 CHECK FOR VOLTAGE TO THE EXTERIOR MIRROR CONTROL SWITCH
  • Disconnect Exterior Mirror Control Switch C535A .
  • Measure:
    Positive Lead Measurement / Action Negative Lead
      C535A-1   Ground

Is the voltage greater than 11 volts?
Yes GO to A2
No VERIFY that CJB fuse 06 (10A) 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.

A2 CHECK FOR GROUND TO THE EXTERIOR MIRROR CONTROL SWITCH
  • Measure:
    Positive Lead Measurement / Action Negative Lead
      C535A-4   Ground

Is the resistance less than 3 ohms?
Yes GO to A3
No REPAIR the circuit.

A3 CHECK THE EXTERIOR MIRROR COMMON CIRCUIT FOR A SHORT TO VOLTAGE
  • Disconnect LH Exterior Mirror C521 .
  • Disconnect RH Exterior Mirror C622 .
  • Ignition ON.
  • Measure:
    Positive Lead Measurement / Action Negative Lead
      C535A-4   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to A4

A4 CHECK THE EXTERIOR MIRROR COMMON CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Measure:
    Positive Lead Measurement / Action Negative Lead
      C535A-4   Ground

Is resistance to ground greater than 10,000 ohms?
Yes GO to A5
No REPAIR the circuit.

A5 CHECK THE EXTERIOR MIRROR COMMON CIRCUIT FOR AN OPEN
  • Measure:
    Positive Lead Measurement / Action Negative Lead
      C535A-4   C622-3

Is the resistance less than 3 ohms?
Yes INSTALL a new exterior mirror control switch.
No REPAIR the circuit.

PINPOINT TEST B: A SINGLE REAR VIEW MIRROR IS INOPERATIVE

Refer to Wiring Diagrams Cell 124 for schematic and connector information.

Normal Operation and Fault Conditions

Each exterior mirror motor has specific circuits that control the down/up and left/right movement of the glass. The motors share a common return circuit.

Possible Sources

  • Exterior mirror motor
  • Wiring, terminals or connectors
  • Exterior mirror control switch
  • Exterior mirror

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

B1 CHECK THE EXTERIOR MIRROR CONTROL SWITCH
  • Disconnect Exterior Mirror Control Switch C535A .
  • Carry out the Exterior Mirror Control Switch component test.
    Refer to Wiring Diagrams Cell 149 for schematic and connector information.

Did the exterior mirror control switch pass the component test?
Yes GO to B2
No INSTALL a new exterior mirror control switch.

B2 CHECK THE INOPERATIVE MIRROR COMMON CIRCUIT FOR AN OPEN
  • Disconnect Inoperative Exterior Mirror LH C521 or RH C622 .
  • Measure

      LH Exterior Mirror


    Positive Lead Measurement / Action Negative Lead
      C535A-4   C521-3

      RH Exterior Mirror


    Positive Lead Measurement / Action Negative Lead
      C535A-4   C622-3

Is the resistance less than 3 ohms?
Yes CHECK the exterior mirror jumper harness between the vehicle harness and the exterior mirror motor for open circuits and damaged or pushed-out pins. If the jumper harness is not OK, REPAIR the jumper harness. If the jumper harness cannot be repaired or is OK, INSTALL a new exterior mirror.
REFER to: Exterior Mirror (501-09 Rear View Mirrors, Removal and Installation).
No REPAIR the circuit.

PINPOINT TEST C: A SINGLE MIRROR DOES NOT FUNCTION WITH SWITCH LOGIC

Refer to Wiring Diagrams Cell 124 for schematic and connector information.

Normal Operation and Fault Conditions

Under normal operation, the exterior mirror control switch supplies voltage and ground to the LH and RH exterior mirrors to control movement. Each mirror contains a horizontal and a vertical motor. The exterior mirror control switch controls movement by reversing polarity of the voltage and ground circuits being supplied to each motor.

Possible Sources

  • Exterior mirror motor
  • Wiring, terminals or connectors
  • Exterior mirror control switch
  • Exterior mirror

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

C1 CHECK THE MIRROR MOVEMENT (LEFT/RIGHT)
  • Operate the LH and RH exterior mirrors in the left and right direction using the exterior mirror control switch.

Do both exterior mirrors move left and right?
Yes GO to C2
No GO to C3

C2 CHECK THE MIRROR MOVEMENT (UP/DOWN)
  • Operate the LH and RH exterior mirrors in the up and down direction using the exterior mirror control switch.

Do both exterior mirrors move up and down?
Yes GO to C7
No GO to C5

C3 CHECK THE VOLTAGE TO THE INOPERATIVE MIRROR LEFT/RIGHT CIRCUITS
  • Disconnect Exterior Mirror LH C521 or RH C622 .
  • Select the incorrectly operating mirror on the exterior mirror control switch.
  • While operating the exterior mirror control switch in the right, left and released positions measure:
    Click to display connectors

      LH Exterior Mirror


    Positive Lead Measurement / Action Negative Lead
      C521-2   Ground

    Click to display connectors

      RH Exterior Mirror


    Positive Lead Measurement / Action Negative Lead
      C622-2   Ground

Is the voltage greater than 11 volts?
Yes CHECK the inoperative exterior mirror jumper harness between the vehicle harness and the exterior mirror motor for open circuits and damaged or pushed-out pins. If the jumper harness is not OK, REPAIR the jumper harness. If the jumper harness cannot be repaired, INSTALL a new exterior mirror.
REFER to: Exterior Mirror (501-09 Rear View Mirrors, Removal and Installation).
If the jumper harness is OK, INSTALL a new exterior mirror motor. REFER to: Exterior Mirror (501-09 Rear View Mirrors, Removal and Installation).
No GO to C4

C4 CHECK THE MIRROR CONTROL LEFT/RIGHT CIRCUITS FOR AN OPEN
  • Disconnect Exterior Mirror Control Switch C535A .
  • For LH or RH measure
    Click to display connectors

      LH Exterior Mirror


    Positive Lead Measurement / Action Negative Lead
      C535A-5   C521-2

    Click to display connectors

      RH Exterior Mirror


    Positive Lead Measurement / Action Negative Lead
      C535A-7   C622-2

Is the resistance less than 3 ohms?
Yes INSTALL a new exterior mirror control switch.
No REPAIR the circuit.

C5 CHECK THE VOLTAGE TO THE INOPERATIVE MIRROR UP/DOWN CIRCUITS
  • Disconnect Exterior Mirror LH C521 or RH C622 .
  • Select the incorrectly operating mirror on the exterior mirror control switch.
  • While operating the exterior mirror control switch in the upward direction, measure:
    Click to display connectors

      LH Exterior Mirror


    Positive Lead Measurement / Action Negative Lead
      C521-1   Ground

    Click to display connectors

      RH Exterior Mirror


    Positive Lead Measurement / Action Negative Lead
      C622-1   Ground

Is the voltage greater than 11 volts?
Yes CHECK the inoperative exterior mirror jumper harness between the vehicle harness and the exterior mirror motor for open circuits and damaged or pushed-out pins. If the jumper harness is not OK, REPAIR the jumper harness. If the jumper harness cannot be repaired, INSTALL a new exterior mirror.
REFER to: Exterior Mirror (501-09 Rear View Mirrors, Removal and Installation).
If the jumper harness is OK, INSTALL a new exterior mirror motor. REFER to REFER to: Exterior Mirror (501-09 Rear View Mirrors, Removal and Installation).
No GO to C6

C6 CHECK THE MIRROR CONTROL UP/DOWN CIRCUITS FOR AN OPEN
  • Disconnect Exterior Mirror Control Switch C535A .
  • For LH or RH measure
    Click to display connectors

      LH Exterior Mirror


    Positive Lead Measurement / Action Negative Lead
      C535A-6   C521-1

    Click to display connectors

      RH Exterior Mirror


    Positive Lead Measurement / Action Negative Lead
      C535A-8   C622-1

Is the resistance less than 3 ohms?
Yes INSTALL a new exterior mirror control switch.
No REPAIR the circuit.

C7 CHECK THE HARNESS(ES) AND CONNECTORS
  • Disconnect Exterior Mirror Control Switch C535A .
  • Disconnect Inoperative Exterior Mirror LH C521 or RH C622 .
  • Inspect the following:
    • connector(s) (including any inline connectors) for corrosion, loose or spread terminals and loose or frayed wire connections at terminals.
    • wire harness for any damaged, pinched, cut or pierced wires.

Were any concerns found?
Yes REPAIR as necessary. Refer to Wiring Diagrams Cell 5 for schematic and connector information.
No The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.

PINPOINT TEST D: ONE OR BOTH HEATED EXTERIOR MIRRORS ARE INOPERATIVE

NOTE: Clean the entire mirror assembly and glass to assist in verification of the customer concern and/or impact damage. Do not clean any mirror glass or housing with an ice scraper, razor blade, abrasive pad, harsh chemicals or petroleum based cleaning products, as these may damage the mirror glass and/or housing.


Refer to Wiring Diagrams Cell 124 for schematic and connector information. Refer to Wiring Diagrams Cell 56 for schematic and connector information.

Normal Operation and Fault Conditions

The heated exterior mirrors receive voltage from the rear window defrost system. The heated exterior mirrors only operate when the rear window defrost is on. REFER to: Glass, Frames and Mechanisms - Overview (501-11 Glass, Frames and Mechanisms, Description and Operation).

Possible Sources

  • Fuse
  • Wiring, terminals or connectors
  • Rear window defrost system concern
  • Exterior mirror

Visual Inspection and Pre-checks

  • Inspect the suspect exterior mirror housing and glass for damage.
D1 CHECK THE OPERATION OF THE REAR WINDOW DEFROST SYSTEM
  • Start the engine.
  • With the engine running, activate the rear window defrost.
  • Using an infrared temperature gun or equivalent, measure the temperature of the rear window glass for approximately 30 seconds, noting changes in temperature.

Does the temperature of the rear window glass rise?
Yes GO to D2
No DIAGNOSE the rear window defrost system
REFER to: Glass, Frames and Mechanisms (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing).
.

D2 CHECK THE OPERATION OF THE HEATED EXTERIOR MIRRORS
  • With the rear window defrost ON, using an infrared temperature gun or equivalent, measure the temperature of the LH and RH exterior mirror glass for approximately 30 seconds, noting changes in temperature.

Does the temperature of at least one exterior mirror glass rise?
Yes For inoperative LH heated mirror glass, GO to D3
For inoperative RH heated mirror glass, GO to D5
No VERIFY that BJB fuse 14 (10A) 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.

D3 CHECK THE VOLTAGE TO THE LH (LEFT-HAND) HEATED EXTERIOR MIRROR GLASS
  • Ignition OFF.
  • Disconnect: LH Exterior Mirror C521.
  • Start the engine.
  • With the engine running, activate the rear window defrost.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C521-11   Ground

Is the voltage greater than 11 volts?
Yes GO to D4
No REPAIR the circuit.

D4 CHECK THE LH (LEFT-HAND) EXTERIOR MIRROR GROUND CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C521-12   Ground

Is the resistance less than 3 ohms?
Yes GO to D7
No REPAIR the circuit

D5 CHECK THE VOLTAGE TO THE RH (RIGHT-HAND) HEATED EXTERIOR MIRROR GLASS
  • Ignition OFF.
  • Disconnect: RH Exterior Mirror C622.
  • Start the engine.
  • With the engine running, activate the rear window defrost.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C622-11   Ground

Is the voltage greater than 11 volts?
Yes GO to D6
No REPAIR the circuit.

D6 CHECK THE RH (RIGHT-HAND) EXTERIOR MIRROR GROUND CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C622-12   Ground

Is the resistance less than 3 ohms?
Yes GO to D7
No REPAIR the circuit.

D7 CHECK THE EXTERIOR MIRROR JUMPER HARNESS
  • Inspect the exterior mirror jumper harness between the vehicle harness and the mirror motors for:
    • Open or short circuits
    • Damaged or pushed out pins
    • Corrosion

Is the harness OK?
Yes INSTALL a new exterior mirror glass
REFER to: Exterior Mirror (501-09 Rear View Mirrors, Removal and Installation).
.
No REPAIR the harness as necessary. If the harness cannot be repaired, INSTALL a new exterior mirror
REFER to: Exterior Mirror (501-09 Rear View Mirrors, Removal and Installation).
.

PINPOINT TEST E: THE INTERIOR AUTO-DIMMING MIRROR DOES NOT OPERATE CORRECTLY

Refer to Wiring Diagrams Cell 124 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Rear View Mirrors - System Operation and Component Description (501-09 Rear View Mirrors, Description and Operation).

Possible Sources

  • Fuse
  • Wiring, terminals or connectors
  • Obstructed forward or rearward sensors
  • Gear input concern
  • Reverse lamp concern
  • Interior auto-dimming mirror

Visual Inspection and Pre-checks

  • Inspect the interior mirror forward and rearward facing sensors for damage, debris or obstructions
  • Inspect BCM fuse 9 (10A).

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector. Use only Rotunda Flex Probes (NUD105-R025D)

E1 VERIFY THE OPERATION OF THE REVERSE LAMPS
  • Ignition ON.
  • Apply the parking brake.
  • While observing the reversing lamps, select each gear in the entire range.

Do the reverse lamps illuminate ONLY in REVERSE?
Yes Select PARK. GO to E2
No Select PARK. DIAGNOSE the reverse lamps.
REFER to: Reversing Lamps (417-01 Exterior Lighting, Diagnosis and Testing).

E2 INSPECT THE MIRROR FOR PROPER INSTALLATION
  • Inspect the interior auto-dimming mirror to make sure the rearward facing sensor is at the top of the mirror glass.

Is the rearward facing sensor at the top of the interior auto-dimming mirror glass?
Yes GO to E3
No INSTALL the interior auto-dimming mirror as per the removal and installation procedure.
REFER to: Interior Rear View Mirror (501-09 Rear View Mirrors, Removal and Installation).

E3 VERIFY THE FORWARD AND REARWARD FACING SENSORS ARE NOT BLOCKED
  • Visually verify the forward and rearward facing sensors are not blocked or obstructed. Sources of obstruction can include:
    • Stickers, window decals or tags.
    • Fold-down screens for TVs or DVD players.
    • Non-OEM window tinting.
    • Dirt and debris

Are either of the sensors blocked?
Yes If possible, REMOVE the obstruction. If it is not possible to remove the obstruction, ADVISE the customer the blockage will affect the operation of the auto-dimming mirror.
No GO to E4

E4 VERIFY THE OPERATION OF THE INTERIOR AUTO-DIMMING MIRROR - DAYLIGHT CONDITIONS
  • Simulate daylight conditions by using a bright lamp to illuminate the forward and rearward facing sensors. The mirror should adjust to a high reflectance state (mirror will be clear).

Did the mirror adjust to a high reflectance (clear) state?
Yes GO to E5
No INSTALL a new interior auto-dimming mirror.
REFER to: Interior Rear View Mirror (501-09 Rear View Mirrors, Removal and Installation).

E5 VERIFY THE OPERATION OF THE INTERIOR AUTO-DIMMING MIRROR - NIGHTTIME CONDITIONS WITHOUT GLARE
  • NOTE: Covering the sensor(s) with a finger or hand is not adequate for this step. Simulate nighttime conditions without glare by using black electrical tape or other dark material to cover the forward and rearward facing sensors. The mirror should adjust to a high reflectance state (mirror will be clear).

Did the mirror adjust to a high reflectance (clear) state?
Yes GO to E6
No INSTALL a new interior auto-dimming mirror.
REFER to: Interior Rear View Mirror (501-09 Rear View Mirrors, Removal and Installation).

E6 VERIFY THE OPERATION OF THE INTERIOR AUTO-DIMMING MIRROR - NIGHTTIME CONDITIONS WITH GLARE
  • NOTE: Covering the sensor(s) with a finger or hand is not adequate for this step. Remove the black electrical tape or other dark material from the rearward facing sensor.
  • Simulate nighttime conditions with glare by using black electrical tape or other dark material to cover the forward facing sensor while illuminating the rearward facing sensor using a bright light. The mirror should adjust to a low reflectance state (mirror will be darkened).

Did the mirror adjust to a low reflectance (darkened) state?
Yes GO to E7
No GO to E8

E7 VERIFY THE OPERATION OF THE INTERIOR AUTO-DIMMING MIRROR - VEHICLE IN REVERSE AND NIGHTTIME CONDITIONS WITH GLARE
  • NOTE: Covering the sensor(s) with a finger or hand is not adequate for this step. Continue to illuminate the rearward facing sensor with the forward facing sensor covered.
  • Select REVERSE.

Did the mirror adjust to a high reflectance (clear) state after reverse was selected?
Yes Select PARK. The system is operating correctly at this time. REVIEW the operation of the interior auto-dimming mirror feature with the customer.
No GO to E10

E8 CHECK FOR VOLTAGE TO THE INTERIOR AUTO-DIMMING MIRROR
  • Ignition OFF.
  • Disconnect: Interior Auto-Dimming Mirror C911.
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C911-1   Ground

Is the voltage greater than 11 volts?
Yes GO to E9
No Verify BCM fuse 9 (10A) is OK. If the fuse is OK, REPAIR the circuit. If the fuse is not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

E9 CHECK FOR GROUND AT THE INTERIOR AUTO-DIMMING MIRROR
  • Ignition OFF.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C911-2   Ground

Is the resistance less than 3 ohms?
Yes GO to E10
No REPAIR the circuit.

E10 CHECK FOR VOLTAGE TO THE INTERIOR AUTO-DIMMING MIRROR REVERSE INHIBIT CIRCUIT
  • Ignition OFF.
  • Disconnect: Interior Auto-Dimming Mirror C911 if not previously disconnected.
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C911-3   Ground
  • Select REVERSE.
  • Select PARK.

Is the voltage greater than 11 volts when reverse gear is selected and no voltage present when reverse gear is not selected?
Yes INSTALL a new interior auto-dimming mirror.
REFER to: Interior Rear View Mirror (501-09 Rear View Mirrors, Removal and Installation).
No REPAIR the circuit.


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