Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Lighting Systems Connector End Views

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

Go to Step 2

Go to Exterior Lighting Systems Description and Operation

Verify that the stop lamps are inoperative.

Do the stop lamps operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

Is only one lamp inoperative?

Go to Step 4

Go to Step 5

Inspect the lamp for an open filament or poor connector terminal contact.

Was a condition found?

Go to Step 10

Go to Step 9

Connect a test lamp from ground to the supply voltage circuit terminal of the inoperative lamp socket or connector and apply the service brake. Refer to Circuit Testing .

Does the test lamp illuminate?

Go to Step 7

Go to Step 6

Remove the stop lamp switch and install a fused jumper between the stop lamp switch battery positive voltage circuit terminal and the stop lamp switch signal circuit terminal of the stop lamp switch connector.

Do the stop lamps illuminate?

Go to Step 11

Go to Step 8

Repair the open or high resistance in the ground circuit of the inoperative lamp. Refer to Wiring Repairs .

Is the repair complete?

Go to Step 12

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Repair one of the following conditions. Refer to Wiring Repairs .

Is the repair complete?

Go to Step 12

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Repair one of the following conditions. Refer to Wiring Repairs .

Is the repair complete?

Go to Step 12

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Repair the connector or replace the bulb. Refer to Wiring Repairs , Tail Lamp Bulb Replacement , or High Mount Stop Lamp Bulb Replacement .

Is the repair complete?

Go to Step 12

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Replace the stop lamp switch. Refer to Stop Lamp Switch Replacement .

Did you complete the repair?

Go to Step 12

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3