GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

DEFINITION: Backup lamps always ON

1

Did you review the Exterior Lighting Systems Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Exterior Lighting Systems Description and Operation

2

Verify that the backup lamps remain illuminated when the manual selector is moved out of the REVERSE position.

Does the system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Disconnect the backup lamp switch on manual transmission equipped vehicles at connector 212.
  2. Disconnect the transmission range switch on automatic transmission equipped vehicles at connector 212.

Do the backup lamps remain illuminated?

Go to Step 4

Go to Step 5

4

Repair the short to voltage in the backup lamp supply voltage circuit between the backup lamp switch or the transmission range switch and S318. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 6

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5

  1. Replace the backup lamp switch on manual transmission equipped vehicles
  2. Replace the transmission range switch on automatic transmission equipped vehicles. Refer to Transmission Range Switch Replacement in Automatic Transmission.

Is the repair complete?

Go to Step 6

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6

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3