Diagnostic Aids
The Auto Day-Night mirror may not operate properly or become inoperative due to the following:
| • | An intermittent short to ground in the signal circuit of the LH outside rearview mirror. |
| • | An intermittent short to battery positive voltage in the backup lighting system. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
SCHEMATIC REFERENCE: Automatic Day-Night Mirrors Schematics | ||||
1 | Did you review the Automatic Day-Night Mirror operation and perform the necessary inspections? | -- | Go to Step 2 | Go to Symptoms |
2 |
Does the Automatic Day-Night mirror darken? | -- | Go to Diagnostic Aids | Go to Step 3 |
3 |
Is the resistance less than the specified value? | 3 ohms | Go to Step 4 | Go to Step 10 |
4 |
Is the voltage within the specified range? | B+ | Go to Step 5 | Go to Step 11 |
5 |
Is the voltage less than the specified value? | 0.5 V | Go to Step 6 | Go to Backup Lamps Always On in Lighting Systems |
6 |
Is the voltage within the specified range? | B+ | Go to Step 8 | Go to Step 7 |
7 | Test the reverse input circuit of the inside rearview mirror for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | Go to Backup Lamps Inoperative in Lighting Systems |
8 | Test the signal circuit of the LH outside rearview mirror element for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 9 |
9 | Inspect for poor connections at the harness connector of the inside rearview mirror. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 12 |
10 | Repair an open or high resistance in the ground circuit of the inside rearview mirror. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | -- |
11 | Repair an open or short to ground in the battery positive voltage circuit of the inside rearview mirror. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | -- |
12 | Replace the inside rearview mirror. Refer to Inside Rearview Mirror Replacement . Did you complete the replacement? | -- | Go to Step 13 | -- |
13 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
