For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the entire Automatic Day/Night Mirrors System Check performed? | -- | Go to Step 2 | Go to Automatic Day-Night Mirrors System Check
2 |

1. Turn the ignition switch to the RUN position.
2. Connect a test lamp from the automatic day-night mirror connector cavity 1 to ground. Refer to Troubleshooting with a Test Lamp in Wiring Systems.

Does the test lamp light?

--

Go to Step 4

Go to Step 3

3 | Repair the open in CKT 39 (PNK) Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Go to Automatic Day-Night Mirrors System Check | --
4 | Connect a test lamp from battery positive voltage B+ to cavity 2 of the automatic day-night mirror connector. Refer to Troubleshooting with a Test Lamp in Wiring Systems. Does the test lamp light? | -- | Go to Step 6 | Go to Step 5
5 | Repair the open in CKT 251 (BLK/WHT) (Oldsmobile) CKT 1250 (BLK) (Buick/Pontiac). Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Go to Automatic Day-Night Mirrors System Check | --
6 | Connect a DMM from the automatic day-night mirror connector cavity 3 to ground. Refer to Measuring Voltage in Wiring Systems. Is the voltage within the specified range? | 10 - 15 V | Go to Step 7 | Go to Step 8
7 | Repair the short to battery positive voltage B+ in CKT 24. Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Go to Automatic Day-Night Mirrors System Check | --
8 | Replace the automatic day-night mirror. Refer to Inside Rearview Mirror Replacement . Is the automatic day-night mirror replacement complete? | -- | Go to Automatic Day-Night Mirrors System Check | --