GM Service Manual Online
For 1990-2009 cars only

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 in Lighting Systems. Do the backup lights operate?

--

Go to Step 3

Go to Backup Lamps Inoperative in Lighting Systems

3

  1. Connect a DMM set to VOLTS from the park/neutral position switch C1 cavity F to the automatic day-night mirror connector cavity 3. Refer to Measuring Voltage in Wiring Systems.
  2. Place transmission in reverse.

Is the voltage within the the specified value range?

12 - 14 V

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 to 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

--