GM Service Manual Online
For 1990-2009 cars only

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Action

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Schematic Reference: Interior Lights Schematics

Connector End View Reference: Component Connector End Views

1

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

Go to Step 2

Go to Symptoms - Lighting Systems

2

Verify the dome lamps are inoperative.

Does the system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Test C3 cavity 4 of the instrument panel fuse block for battery positive voltage. Refer to Circuit Testing .

Is voltage present?

Go to Step 7

Go to Step 4

4

Test C4 cavity 7 of the instrument panel fuse block for battery positive voltage. Refer to Circuit Testing .

Is voltage present?

Go to Step 5

Go to Step 6

5

Replace the instrument panel wiring harness.

Did you complete the replacement?

Go to Step 20

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6

Repair open or high resistance in the dome lamp supply voltage circuit. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 20

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7

Test cavity 2 of the front dome lamp for battery positive voltage. Refer to Circuit Testing .

Is voltage present?

Go to Step 9

Go to Step 8

8

Repair open or high resistance in the Dome Lamp supply voltage circuit. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 20

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9

With 1 of the doors open, test C2 cavity 7 of the left instrument panel junction block for continuity to ground. Refer to Circuit Testing .

Is a ground present?

Go to Step 11

Go to Step 10

10

Replace the instrument panel wiring harness. Refer to Wiring Repairs .

Did you complete the replacement?

Go to Step 20

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11

With 1 of the doors open, test cavity 1 of the instrument panel lamp dimmer for continuity to ground. Refer to Circuit Testing .

Is a ground present?

Go to Step 13

Go to Step 12

12

Repair the open in the ground circuit between cavity 1 of the instrument panel dimmer and C2 cavity 7 of the left instrument panel junction block. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 20

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13

Test cavity 8 of the instrument panel lamp dimmer for continuity to ground. Refer to Circuit Testing .

Is a ground present?

Go to Step 14

Go to Step 15

14

Test C7 cavity 3 of the instrument panel fuse block for continuity to ground. Refer to Circuit Testing .

Is a ground present?

Go to Step 16

Go to Step 17

15

Replace the instrument panel dimmer switch.

Did you complete the repair?

Go to Step 20

--

16

Test C3 cavity 6 of the instrument panel fuse block for continuity to ground. Refer to Circuit Testing .

Is a ground present?

Go to Step 19

Go to Step 10

17

Repair the open or high resistance between C7 cavity 3 of the instrument panel fuse block and cavity 8 of the instrument panel lamp dimmer. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 20

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18

Repair open or high resistance between cavity 1 of the dome lamp and C3 cavity 6 of the instrument panel fuse block. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 20

--

19

Repair open or high resistance between C3 cavity 6 of the instrument panel fuse block and cavity 1 of the dome lamp assembly. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 20

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20

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3