GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Backup Lights System Check?

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Go to Step 2

Go to Backup Lamp System Check

2

  1. Turn the ignition switch to the ON position.
  2. Place the transaxle in the REVERSE position.
  3. Backprobe the right IP junction block C3 connector with a test lamp between the following points:
  4. • Inoperative LH lamp - the B2 terminal and ground
    • Inoperative RH lamp - the C2 terminal and ground

Does the test lamp light?

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Go to Step 3

Go to Step 4

3

  1. Disconnect the inoperative rear lamp assembly connector.
  2. Connect a test lamp between the following points:
  3. • Inoperative left lamp - The C terminal of the lamp assembly connector and ground.
    • Inoperative right lamp - The A terminal of the lamp assembly connector and ground.

Does the test lamp light?

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Go to Step 5

Go to Step 6

4

Replace the right IP junction block. Refer to Relay/Fuse Center Replacement in Wiring Systems.

Is the repair complete?

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Go to Backup Lamp System Check

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5

Connect a test lamp between the following points:

    • Inoperative left lamp - The C terminal and the E terminal of the lamp assembly connector
    • Inoperative right lamp - The A terminal and the E terminal of the lamp assembly connector

Does the test lamp light?

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Go to Step 7

Go to Step 8

6

Repair the open in CKT 24 between the right IP junction block and the inoperative rear lamp assembly. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Backup Lamp System Check

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7

Replace the inoperative rear lamp assembly. Refer to one of the following procedures:

    •  Tail Lamp Replacement
    •  Tail Lamp Replacement

Is the repair complete?

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Go to Backup Lamp System Check

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8

Repair the open in one of the following circuits between the inoperative rear lamp assembly and ground:

    • Left rear lamp - CKT 750
    • Right rear lamp - CKT 850

Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Backup Lamp System Check

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