EC Mirror Day/Night Line Fault
NOTE:
After making any repairs, perform BODY VERIFICATION TEST under VERIFICATION TESTS.
- With the DRBIII®, erase the DTC. Cycle the ignition on and off several times, leaving the ignition on for at least 15 seconds. With the DRBIII®, read DTCs. If the DTC reset, go to the next step. If the DTC did not reset, the condition is not present at this time. Monitor DRBIII® parameters while wiggling the related wire harness. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness and connector terminals.
- Turn the ignition off. Disconnect the Automatic Day/Night Mirror harness connector. See Fig 1. Turn the ignition on. Measure the voltage of the Automatic Headlamp Switch Sensor circuit in the Automatic Day/Night Mirror harness connector. If the voltage is 4.9 volts, replace the Automatic Day/Night Mirror. If the voltage is not 4.9 volts, go to the next step.
- Turn the ignition off. Disconnect the EVIC harness connector. See Fig 2. Disconnect the Automatic Day/Night Mirror harness connector. See Fig 1. Measure the resistance of the Automatic Headlamp Switch Sensor circuit between the Automatic Day/Night Mirror harness connector and the EVIC harness connector. If the resistance is below 5 ohms, go to the next step. If the resistance is above 5 ohms, repair the Automatic Headlamp Switch Sensor circuit for an open.
- Turn the ignition off. Disconnect the EVIC harness connector. See Fig 2. Disconnect the Automatic Day/Night Mirror harness connector. See Fig 1. Measure the resistance of the Automatic Headlamp Switch Sensor circuit in the EVIC harness connector to ground. If the resistance is below 5 ohms, repair the Automatic Headlamp Switch Sensor circuit for a short to ground. If the resistance is above 5 ohms, go to the next step.
- Turn the ignition off. Disconnect the Automatic Day/Night Mirror harness connector. See Fig 1. Disconnect the EVIC harness connector. See Fig 2. Using a 12 volt test light connected to ground, probe the Automatic Headlamp Switch Sensor circuit in the Automatic Day/Night Mirror harness connector. If the test light illuminates brightly, repair the Automatic Headlamp Switch Sensor circuit for a short to voltage. If the test light does not illuminate brightly, replace the CMTC/EVIC Module. See OVERHEAD CONSOLE under REMOVAL & INSTALLATION.