Automatic Day-Night Mirrors Malfunction
Diagnostic Instructions
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Ignition
|
1
|
1
|
-
|
-
|
Backup Lamp Control
|
1
|
1
|
1
|
-
|
Ground
|
-
|
1
|
-
|
-
|
1. Inside Electrochromic Mirror Malfunction
|
|
|
Circuit/System Description
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.
With the gear selector lever in the REVERSE position, 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.
Reference Information
Schematic Reference
Inside Rearview Mirror Schematics
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 scan tool information
Circuit/System Verification
1. |
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. |
2. |
Engine running, park brake
applied, place the transmission in REVERSE. The inside rearview
mirror face should transition from dim to bright. |
Circuit/System Testing
1. |
Ignition OFF, disconnect the
harness connector at the A10 inside rearview mirror. |
2. |
Wait 1 minute, test for less
than 10 Ω between the ground circuit terminal 5 and
ground. |
⇒ |
If greater than the specified range, test the
ground circuit for an open/high resistance. |
3. |
Ignition ON, verify that a
test lamp illuminates between the ignition circuit terminal 2 and
ground. |
⇒ |
If the test lamp does not illuminate test the
ignition circuit for an open/high resistance or short to
ground. |
4. |
Engine running, park brake
applied, vehicle in REVERSE, verify that a test lamp illuminates
between the backup lamp control circuit terminal 1 and
ground. |
⇒ |
If the test lamp does not illuminate test the
control circuit for an open/high resistance or short to ground. If
the circuit tests normal, refer to
Backup Lamps Malfunction . |
5. |
If all circuits test normal,
test or replace the A10 inside rearview mirror. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
Inside Rearview Mirror Replacement
|