GM Service Manual Online
For 1990-2009 cars only

Step

Action

Values

Yes

No

1

  1. Block the wheels.
  2. Apply the parking brake to prevent the vehicle from moving.
  3. Turn ON the ignition, with the engine OFF.
  4. Put the transaxle in REVERSE.
  5. Remove one of the backup lamps from its socket.
  6. Test the lamp socket positive terminal with a voltmeter.

Does the battery voltage available at the backup lamp socket positive terminal within the specified value?

11-14 V

Go to Step 3

Go to Step 2

2

Repair the open circuit between fuse F15 and the backup lamps.

Is the repair complete?

--

System OK

--

3

Connect an ohmmeter between ground and the negative terminal at the bulb socket.

Is the resistance equal to the specified value?

0 ohms

Go to Step 4

Go to Step 5

4

Replace the faulty backup lamps.

Is the repair complete?

--

System OK

--

5

  1. Install the backup lamps.
  2. Disconnect the electrical connector at the reverse switch.
  3. Turn ON the ignition, with the engine OFF.
  4. Put the transaxle in REVERSE.
  5. Use a voltmeter to inspect for the reverse switch terminal 1 (M/T) or 7 (A/T).

Is the voltage available at terminal 1 within the specified value?

11-14 V

Go to Step 7

Go to Step 6

6

Repair the open circuit between the backup lamps and the reverse switch.

Is the repair complete?

--

System OK

--

7

  1. Put the transaxle in REVERSE with the engine OFF.
  2. Use an ohmmeter to measure the continuity between reverse switch terminal 1 and 2.

Does the continuity between terminals 1 and 2, terminals 7 and 8 with A/T, equal the specified value?

0 ohms

Go to Step 9

Go to Step 8

8

Replace the REVERSE switch.

Is the repair complete?

--

System OK

--

9

Repair the ground circuit between REVERSE switch and the backup lamps.

Is the repair complete?

--

System OK

--