Automatic Day-Night Mirrors Malfunction
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Automatic Day-Night Mirrors Malfunction
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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Ignition
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1
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1
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-
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-
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Automatic Day/Night Mirror Signal
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B154D 02
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B154D 02
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B154D 01
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-
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Backup Lamp Control
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1, 2
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1, 2
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1, 2
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-
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Automatic Day/Night Mirror Low Reference
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-
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2
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2
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-
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Ground
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-
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1
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-
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-
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1. Inside Electrochromic Mirror Malfunction
2. Outside Rearview Mirror Automatic Dimming Malfunction
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Circuit/System Description
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The inside rearview mirror uses 2 photocell sensors. One sensor is the rear light sensor, located on the face side of the mirror, facing the rear of the vehicle. The rear light sensor is used to determine light conditions present at the mirror face. The other sensor is the front light sensor, located on the backside of the mirror, facing the front of the vehicle. The front light sensor is used to determine the exterior light conditions at the front of the vehicle. With a low exterior light condition detected by the front light sensor and a high light condition from the rear light sensor, the inside rearview mirror will automatically darken the face of the inside rearview mirror and the driver outside rearview mirror. The inside rearview mirror provides a signal circuit and a low reference circuit to the driver mirror face to darken the mirror when needed.
With the gear selector lever in the REVERSE position and the engine running, backup lamp control voltage is supplied as an input to the inside rearview mirror. The mirror monitors this input to disable the automatic day-night feature. This allows the driver to see objects in the mirror clearly when backing up, regardless of the rear light sensor status.
Schematic Reference
Connector End View Reference
Component Connector End Views
Description and Operation
Automatic Day-Night Mirror Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
for information on diagnostic tools
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Circuit/System Verification
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1.
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Ignition ON, headlamps ON, vehicle in PARK, cover the front light sensor with a towel or other suitable item. Shine a flashlight at the rear light sensor while observing the inside rearview mirror face. The inside rearview mirror face should dim.
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2.
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Set the gear selector lever to the REVERSE position with the engine running and the parking brake applied. The glass of the inside rearview mirror should switch from the dim to the bright state.
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3.
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If the mirror does not transition between the bright and dim states, refer to Inside Rearview Mirror Dimming Malfunction.
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4.
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Vehicle in PARK, shine a flashlight at the rear light sensor while observing the driver outside rearview mirror face. The outside rearview mirror face should dim.
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5.
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Set the gear selector lever to the REVERSE position with the engine running and the parking brake applied. The glass of the outside mirror on the driver side should switch from the dim to the bright state.
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6.
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If the mirror does not transition between the bright and dim states, refer to Outside Rearview Mirror Dimming Malfunction.
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Inside Rearview Mirror Dimming Malfunction
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1.
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Ignition OFF, disconnect the harness connector at the A10 inside rearview mirror.
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2.
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Wait 1 minute, test for less than 10 Ω between the ground circuit terminal 5 and ground.
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3.
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If greater than the specified range, test the ground circuit for an open/high resistance.
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4.
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Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 2 and ground.
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5.
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If the test lamp does not illuminate, test the ignition circuit for an open circuit/high resistance or short to ground.
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6.
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Engine running, park brake applied, vehicle in REVERSE, verify that a test lamp illuminates between the backup lamp control circuit terminal 1 and ground.
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7.
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If the test lamp does not illuminate, test the control circuit for an open circuit/high resistance or short to ground. If the circuit tests normal, refer to
Backup Lamps Malfunction
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8.
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If all circuits test normal, test or replace the A10 inside rearview mirror.
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Outside Rearview Mirror Dimming Malfunction
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1.
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Ignition OFF, disconnect the harness connector at the A9A driver outside rearview mirror.
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2.
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Wait 1 minute, test for less than 10 Ω between the low reference circuit terminal 14 and ground.
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3.
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If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, test or replace the A10 inside rearview mirror.
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4.
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Ignition ON, test for less than 1 V between the signal circuit terminal 13 and ground.
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5.
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If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the A10 inside rearview mirror.
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6.
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Headlamps ON, vehicle in PARK, cover the front light sensor with a towel or other suitable item. Shine a flashlight at the rear light sensor. Test for greater than 1 V between the signal circuit terminal 13 and ground.
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7.
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If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the A10 inside rearview mirror.
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8.
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If all circuits test normal, test or replace the K17D driver outside rearview mirror glass.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
