For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Exterior Lights Schematics Connector End View Reference: Lighting Systems Connector End Views
1 | 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
2 | 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
3 | Is only one lamp inoperative? | Go to Step 4 | Go to Step 5
4 | Inspect the lamp for an open filament or poor connector terminal contact. Was a condition found? | Go to Step 10 | Go to Step 9
5 | 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
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
7 | 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 | --
8 | Repair one of the following conditions. Refer to Wiring Repairs .

• | The open, high resistance, or short to ground in the battery positive voltage circuit or the stop lamp supply voltage circuit.

• | The open or high resistance in the ground circuit.

Is the repair complete?

Go to Step 12

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

• | The open, high resistance, or a short to ground in the stop lamp supply voltage circuit

• | The open or high resistance in the ground circuit

Is the repair complete?

Go to Step 12

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10 | 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 | --
11 | Replace the stop lamp switch. Refer to Stop Lamp Switch Replacement . Did you complete the repair? | Go to Step 12 | --
12 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3