Schematic Reference: Interior Lights Dimming Schematics

Connector End View Reference: Lighting Systems Connector End Views

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

1. Place the headlamp switch in the PARK position.
2. Operate the instrument panel (I/P) dimmer switch.

Does the interior backlighting illuminate?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

1. Remove the marker lamp relay.
2. Probe the coil side voltage supply circuit of the marker lamp relay with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 13

Connect a test lamp between the coil side voltage supply circuit of the marker lamp relay and the coil side control circuit of the marker lamp relay.

Does the test lamp illuminate?

Go to Step 5

Go to Step 12

Probe the switch side voltage input circuit of the marker lamp relay with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 6

Go to Step 14

Connect a fused jumper wire between the switch side voltage input circuit of the marker lamp relay and the switch side output circuit of the marker lamp relay.

Does the backlighting illuminate?

Go to Step 10

Go to Step 7

1. Leave the fused jumper wire connected.
2. Disconnect the inline connector 212.
3. Probe the backlighting voltage supply circuit of inline connector 212 with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 8

Go to Step 15

1. Reconnect inline connector 212.
2. Remove the instrument panel cluster (IPC). Refer to Instrument Cluster Replacement .
3. Connect a fused jumper wire between the backlighting dimming control circuit at the IPC connector and ground.

Does the backlighting illuminate?

Go to Step 9

Go to Step 16

Probe the ground circuit of the I/P dimmer switch at the IPC connector with a test lamp that is connected to battery positive voltage.

Does the test lamp illuminate?

Go to Step 11

Go to Step 17

Inspect for poor connections at the marker lamp relay. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 18

Inspect for poor connections at the IPC. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 19

Inspect for poor connections at the headlamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 20

Repair the following in the coil side voltage supply circuit of the marker lamp relay:

Refer to Circuit Testing and Wiring Repairs .

Did you complete the repair?

Go to Step 21

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Repair an open or high resistance in the switch side voltage supply circuit of the marker lamp relay. Refer to Circuit Testing and Wiring Repairs .

Did you complete the repair?

Go to Step 21

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Repair the following in the backlighting voltage supply circuit:

Refer to Circuit Testing and Wiring Repairs .

Did you complete the repair?

Go to Step 21

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Repair an open or high resistance in the backlighting dimming control circuit. Refer to Circuit Testing and Wiring Repairs .

Did you complete the repair?

Go to Step 21

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Repair an open or high resistance in the ground circuit of the I/P dimmer switch. Refer to Circuit Testing and Wiring Repairs .

Did you complete the repair?

Go to Step 21

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Replace the marker lamp relay.

Did you complete the replacement?

Go to Step 21

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Replace the IPC. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 21

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Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the replacement?

Go to Step 21

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3