Important: A short to ground will cause an open fuse(s). Before performing this diagnostic procedure, inspect the fuse(s) for an open.

1. Disconnect the high mounted stop lamp assembly connector.
2. Connect a test lamp between terminal A of the high mounted stop lamp assembly connector and ground.
3. Depress the brake pedal.

Does the test lamp light?

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Go to Step 2

Go to Step 3

1. Connect a test lamp between terminal A and terminal B of the high mounted stop lamp assembly connector.
2. Depress the brake pedal.

Does the test lamp light?

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Go to Step 4

Go to Step 5

1. Use a test lamp in order to backprobe connector C3 of the left IP terminal C10.
2. Depress the brake pedal.

Does the test lamp light?

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Go to Step 6

Go to Step 7

Replace the faulty bulb or repair the open in the lamp assembly. Refer to High Mount Stop Lamp Replacement .

Is the repair complete?

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Go to Exterior Lights System Check

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Repair the open in CKT 750 between the high mounted stop lamp assembly and ground splice pack G401. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Exterior Lights System Check

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Repair the open in CKT 20 between the left IP junction block and the high mounted stop lamp assembly. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Exterior Lights System Check

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Replace the left IP junction block.

Is the repair complete?

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Go to Exterior Lights System Check

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