1. Move the headlamp switch to the park position.
2. Observe that the park lamps are operating.
3. Adjust the dimmer switch to the brightest position.

Are all of the instrument panel cluster illumination lamps inoperative?

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Go to Step 8

Go to Step 2

Inspect each IP cluster illumination lamp.

Is one or more of the illumination lamps inoperative?

--

Go to Step 3

Go to Step 6

Test for an open in CKT 8 (GRY) between splice S217 and the affected lamp or in CKT 451 (BLK/WHT) between ground and the affected lamp.

Is a repair necessary?

--

Go to Step 4

Go to Step 5

Repair the open in CKT 8 (GRY) between splice S217 and the affected lamp or in CKT 451 (BLK/WHT) between ground and the affected lamp.

Is the repair complete?

--

System OK

--

Replace the affected lamp.

Is the repair complete?

--

System OK

--

Adjust the dimmer switch to the brightest position.

Do the IP cluster illumination lamps brighten in response to the movement of the dimmer switch?

--

System OK

Go to Step 7

Replace the dimmer switch.

Is the repair complete?

--

System OK

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1. Adjust the dimmer switch to the brightest position.
2. Use a J 39200 Digital MultiMeter in order to measure the voltage from the illumination fuse 14 to ground.

Is the voltage less than the specified value?

10 V

Go to Step 9

Go to Step 12

Check for an open or high resistance in CKT 44 (DK GRN) or CKT 8 (GRY) between the dimmer switch and splice S217.

Is a repair necessary?

--

Go to Step 10

Go to Step 11

Repair the open or high resistance in CKT 44 (DK GRN) or CKT 8 (GRY) between the dimmer switch and splice S217.

Is the repair complete?

--

System OK

--

Replace the dimmer switch.

Is the repair complete?

--

System OK

--

Locate and repair the open in CKT 451 (BLK/WHT) between the instrument cluster and one of the following grounds:

Is the repair complete?

--

System OK

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