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 | Test the backup lights. Refer to Backup Lamp System Check . Do the backup lights operate? | -- | Go to Step 3 | Go to Step 7
3 | Connect a DMM from the park/neutral position switch C1 cavity F to the automatic day-night mirror connector cavity 3. Refer to Testing for Continuity in Wiring Systems. Is the resistance less than the specified value? | 5 ohms | Go to Step 4 | Go to Step 12
4 | Connect a DMM from the automatic day-night connector cavity 2 to ground. Refer to Testing for Continuity in Wiring Systems. Is the resistance less than the specified value? | 5 ohms | Go to Step 5 | Go to Step 6
5 | Replace the automatic day night mirror. Refer Inside Rearview Mirror Replacement . Is the automatic day-night mirror replacement complete? | -- | Go to Automatic Day-Night Mirrors System Check | --
6 | 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 | --
7 | Inspect CKT 539 (PNK) for an open. Was an open found? | -- | Go to Step 8 | Go to Step 9
8 | Repair the open in CKT 539 (PNK). Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Go to Automatic Day-Night Mirrors System Check | --
9 | Inspect the park/neutral position switch C1 cavities B and F for proper connections. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems. Are the connections OK? | -- | Go to Step 10 | Go to Step 11
10 | Replace the park/neutral position switch. Refer to Park/Neutral Position Switch Replacement in Automatic Transaxle. Is the park/neutral position switch replacement complete? | -- | Go to Automatic Day-Night Mirrors System Check | --
11 | Repair the park/neutral position switch cavities B and F. Refer to Wiring Repairs in Wiring Systems. Is the terminal repair complete? | -- | Go to Automatic Day-Night Mirrors System Check | --
12 | Repair the open in CKT 24 (LT GRN). Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Go to Automatic Day-Night Mirrors System Check | --