Test D: Automatic Dimming Function Inoperative
NOTE:
Perform inside mirror self-test before proceeding with this procedure. See INSIDE MIRROR SELF-TEST
under COMPONENT TESTS.
- Ensure transmission is in Park. Turn ignition switch to RUN position. Cover light sensor on back of inside mirror. Using a flashlight, shine light into light sensor on front of inside mirror. If mirror does not darken, go to next step. If mirror darkens, system is okay at this time.
- Turn ignition switch to LOCK position. Disconnect inside mirror 6-pin harness connector C341. Turn ignition switch to RUN position. Measure voltage between inside mirror harness connector C341 terminal No. 4 (Black wire) and terminals No. 5 (Light Green/Yellow wire) and No. 6 (Red/Yellow wire). See Fig 1 . If both measurements are more than 10 volts, replace inside rearview mirror. If either measurement is 10 volts or less, go to next step.
- Measure voltage between ground and inside mirror harness connector terminal No. 6 (Red/Yellow wire). If more than 10 volts exists, go to next step. If 10 volts or less exists, repair open in Red/Yellow wire. See WIRING DIAGRAMS . Recheck system operation.
- Measure voltage between ground and inside rearview mirror harness connector C341 terminal No. 5 (Light Green/Yellow wire). If more than 10 volts exists, repair open in Black wire between inside mirror and ground. If 10 volts or less exists, repair open in Light Green/Yellow wire. See WIRING DIAGRAMS . Recheck system operation.