Schematic Reference: Interior Lights Dimming Schematics

Connector End View Reference: Power and Grounding Connector End Views in Wiring Systems

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.

Are all the I/P lamps on?

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

Go to Step 3

Are all of the instrument panel lamps inoperative?

Go to Step 11

Go to Step 4

Are any of the steering wheel control lamps inoperative?

Go to Step 5

Go to Step 13

Is one steering wheel control switch illuminated?

Go to Step 7

Go to Step 6

1. Remove both steering wheel control switches.
2. Using a test lamp connected to ground, probe the I/P lamp dimming supply circuit of each switch. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate at each supply circuit?

Go to Step 9

Go to Step 8

1. Remove the inoperative steering wheel control switch.
2. Using a test lamp connected to ground, probe the I/P lamp dimming supply circuit of the inoperative steering wheel control switch. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

Go to Step 9

Go to Step 8

Test for a high resistance or an open in the IP dimming lamp supply circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 14

Test for a high resistance or an open in the IP dimming lamp ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 14

1. Disconnect the headlamp switch.
2. Install a fused jumper between the courtesy lamp switch signal circuit and the instrument panel lamp supply voltage circuit.

Do the instrument panel lamps turn on?

Go to Step 18

Go to Step 19

Inspect the instrument panel lamps dimming control circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 12

Inspect the dimming potentiometer reference ground circuit for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 10

Inspect for a high resistance or an open in the inoperative instrument panel lamp component supply voltage supply circuit or the ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 16

Inspect for a poor connection at the harness connector of the steering wheel control switches. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 15

Replace the inoperative steering wheel control switch. Refer to Steering Wheel Control Switch Assembly Replacement in Steering Wheel and Column.

Did you complete the repair?

Go to Step 20

--

Test for a poor connection, an open, or a short to ground in the park lamp switch ON signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 17

Replace the inoperative component or bulb.

Did you complete the repair?

Go to Step 20

--

Replace the headlamp switch. Refer to Headlamp Switch Replacement in Instrument Panel, Gages, and Console.

Did you complete the repair?

Go to Step 20

--

Repair a poor connection, an open, or a short to ground in the instrument panel lamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 20

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3