Schematic Reference: Interior Lights Dimming Schematics

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Turn the ignition to the ON position.
2. Turn the headlamp switch to the PARK position.
3. Turn the I/P lamp dimmer switch to a high position.

Is all backlighting operating properly?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

Are all of the interior backlighting inoperative?

Go to Step 5

Go to Step 4

Are any of the VF dimming displays inoperative?

Go to Step 11

Go to Step 9

Check the PANEL DIMMING fuse for an open.

Is the PANEL DIMMING fuse open?

Go to Step 15

Go to Step 6

1. Turn the headlamp switch to the PARK position.
2. With the PANEL DIMMING fuse in the fuse block.
3. Backprobe the parklamp switch on signal circuit of the PANEL DIMMING fuse with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 7

Go to Step 14

Test for a high resistance or an open in the I/P lamp fuse supply voltage circuit of the headlamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 8

Test for a high resistance or an open in the I/P lamp supply voltage circuit of the headlamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 16

1. If a single component is inoperative
2. Test for a high resistance or an open in the I/P lamp supply voltage circuit of the inoperative component. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 10

Test for a high resistance or an open in the ground circuit of the inoperative component. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 17

Test for a high resistance or an open in the I/P lamp supply voltage circuit of the inoperative VF dimming component. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 12

Test for a high resistance or an open in the I/P lamp fuse supply voltage circuit of the inoperative VF dimming component. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 13

Test for a high resistance or an open in the ground circuit of the inoperative VF dimming component. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 17

Repair a high resistance or an open in the park lamps switch on signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 18

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Repair a short to ground in the I/P lamp fuse supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 18

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Replace the headlamp switch.

Refer to Headlamp Switch Replacement in Instrument Panel, Gauges, and Console.

Did you complete the repair?

Go to Step 18

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Replace the inoperative component or bulb.

Did you complete the repair?

Go to Step 18

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2