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Rear View Mirrors - Interior




Rear View Mirrors - Interior

Pinpoint Tests

Pinpoint Test E: The Auto-Dimming Mirror Does Not Operate Correctly

Refer to Wiring Diagram Set 124 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Power Mirrors for schematic and connector information. Diagrams By Number

Normal Operation

The interior auto-dimming mirror receives voltage from Smart Junction Box (SJB) fuse 41 (15A) through circuit CBP43 (GY) and ground from circuit GD182 (BK/GY). When the vehicle is placed in REVERSE, voltage is supplied to the interior mirror through circuit CBB07 (GN/BU) in order to the turn the dimming feature off. There are 2 photoelectric sensors: one in the front of the mirror and one mounted on the glass side of the mirror. If the sensors are blocked, the auto-dimming feature may not work correctly. Always verify both sensors are not physically blocked before attempting to diagnose interior auto-dimming mirror concerns.

This pinpoint test is used to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Interior auto-dimming rear view mirror



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

NOTE: If the Transmission Range (TR) sensor is malfunctioning and the backup lamps are on all the time or do not turn on, the interior auto-dimming mirror will not darken or return to normal view.

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E1 CHECK OPERATION OF THE BACKUP LAMPS


- Ignition ON.
- Move the shift lever through the entire range.
- Do the reversing lamps illuminate only in REVERSE?

Yes
GO to E2.

No
REFER to Lighting and Horns to diagnose the reversing lamps. Lighting and Horns

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E2 VERIFY THE FORWARD AND REARWARD FACING SENSORS ARE NOT BLOCKED


- Visually verify the forward and rearward facing sensors are not blocked. Sources of blockage can include:
- stickers, window decals or tags.
- fold-down screens for TVs or DVD players.
- non-OEM window tinting.
- Are either of the sensors blocked?

Yes
If possible, remove the blockage. TEST the system for normal operation. If it is not possible to remove the blockage, REVIEW the operation of the interior auto-dimming rear view mirror with the customer.

No
GO to E3.

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E3 CHECK OPERATION OF THE INTERIOR AUTO-DIMMING REAR VIEW MIRROR - DAYLIGHT CONDITIONS


- Ignition ON.
- Use a bright lamp to illuminate the forward facing sensor and the rearward facing sensor. The mirror should adjust to a high reflectance mode (mirror will be clear).




- Does the mirror adjust to the high reflectance (clear) mode?

Yes
GO to E4.

No
INSTALL a new interior auto-dimming rear view mirror. REFER to Interior Rear View Mirror Interior Rear View Mirror. TEST the system for normal operation.

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E4 CHECK THE OPERATION OF THE INTERIOR AUTO-DIMMING REAR VIEW MIRROR - NIGHTTIME CONDITIONS WITHOUT GLARE


- NOTE: Covering the sensor with a finger or hand is not adequate.
- Simulate nighttime conditions without glare:
- Cover the forward sensor with black electrical tape or other dark material.
- Cover the rearward facing sensor with black electrical tape or other dark material. The mirror should adjust to the high reflectance mode.




- Does the mirror adjust to the high reflectance (clear) mode?

Yes
GO to E5.

No
GO to E7.

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E5 CHECK THE OPERATION OF THE INTERIOR AUTO-DIMMING REAR VIEW MIRROR - NIGHTTIME CONDITIONS WITH GLARE


- NOTE: Covering the sensor with a finger or hand is not adequate.
- Simulate nighttime conditions with glare:
- Remove the black electrical tape or other dark material from the rear facing sensor.
- Illuminate the rearward facing sensor. The mirror should darken to a lower reflectance mode.




- Does the mirror darken to a lower reflectance (darker) mode?

Yes
GO to E6.

No
GO to E7.

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E6 CHECK THE OPERATION OF THE INTERIOR AUTO-DIMMING REAR VIEW MIRROR - NIGHTTIME CONDITIONS WITH VEHICLE IN REVERSE


- NOTE: Covering the sensor with a finger or hand is not adequate.
- Simulate nighttime conditions with glare:
- Illuminate the rearward facing sensor.




- Select REVERSE.
- Does the mirror adjust to a high reflectance (clear) mode?

Yes
The system is operating normally at this time. Review operation of the interior auto-dimming rear view mirror feature with the customer.

No
GO to E7.

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E7 CHECK THE POWER TO THE INTERIOR AUTO-DIMMING REAR VIEW MIRROR


- Ignition OFF.
- Disconnect: Interior Auto-dimming Rear View Mirror C9012 or C9030 (with microphone).
- Ignition ON.
- Without microphone: Measure the voltage between the interior auto-dimming rear view mirror C9012-1, circuit CBP41 (BU), harness side and ground.




- With microphone: Measure the voltage between the interior auto-dimming rear view mirror C9030-1, circuit CBP41 (BU), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to E8.

No
VERIFY SJB fuse 41 (15A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. TEST the system for normal operation.

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E8 CHECK CIRCUIT GD182 (BK/GY) FOR AN OPEN


- Ignition OFF.
- Without microphone: Measure the resistance between the interior auto-dimming rear view mirror C9012-3, circuit GD182 (BK/GY), harness side and ground.




- With microphone: Measure the resistance between the interior auto-dimming rear view mirror C9030-10, circuit GD182 (BK/GY), harness side and ground.




- Is the resistance less than 5 ohms?

Yes
GO to E9.

No
REPAIR the circuit. TEST the system for normal operation.

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E9 CHECK THE REVERSE INPUT


- Ignition ON.
- Select REVERSE.
- Without microphone: With the transmission in REVERSE, measure the voltage between interior auto-dimming rear view mirror C9012-2, circuit CBB07 (GN/BU), harness side and ground.




- With microphone: With the transmission in REVERSE, measure the voltage between interior auto-dimming rear view mirror C9030-3, circuit CBB07 (GN/BU), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
INSTALL a new interior auto-dimming rear view mirror. REFER to Interior Rear View Mirror Interior Rear View Mirror. TEST the system for normal operation.

No
REPAIR the circuit. TEST the system for normal operation.

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