DEFINITION: LH or RH stop lamp or auxiliary brake lamp inoperative.

Did you perform the Exterior Lights Diagnostic System Check?

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Go to Step  2

Go to Exterior Lights System Check

1. Press the brake pedal.
2. Determine if the LH or RH stop lamp or the auxiliary brake lamp is inoperative.

Is the auxiliary brake lamp inoperative?

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Go to Step  3

Go to Step  8

1. Disconnect the auxiliary brake lamp connector.
2. Press the brake pedal.
3. Use the DMM in order to measure the voltage between terminal B of the auxiliary brake lamp connector and a known good ground.

Does the voltage measure near the specified value?

B+

Go to Step  5

Go to Step  4

1. Locate an open or a high resistance in CKT FB5 and/or CKT FB15.
2. Repair the open or the high resistance in CKT FB5 and/or CKT FB15.

Did you complete the repair?

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Go to Step  19

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Use the DMM in order to measure the resistance between terminal A of the auxiliary brake lamp connector and a known good ground.

Does the resistance measure near the specified value?

Less than 5 ohms

Go to Step  7

Go to Step  6

1. Locate an open or a high resistance in CKT F3.
2. Repair the open or the high resistance in CKT F3.

Did you complete the repair?

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Go to Step  19

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Replace the auxiliary brake lamp. Refer to High Mount Stop Lamp Replacement in Lighting Systems.

Did you complete the repair?

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Go to Step  19

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Is the LH stop lamp inoperative?

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Go to Step  14

Go to Step  9

1. Disconnect the RH stop lamp connector.
2. Press the brake pedal.
3. Use the DMM in order to measure the voltage between terminal D of the RH stop lamp connector and a known good ground.

Does the voltage measure near the specified value?

B+

Go to Step  11

Go to Step  10

1. Locate an open or a high resistance in CKT FB2.
2. Repair the open or the high resistance in CKT FB2.

Did you complete the repair?

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Go to Step  19

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Use the DMM in order to measure the resistance between terminal B of the RH stop lamp connector and a known good ground.

Does the resistance measure less than the specified value?

5 ohms

Go to Step  13

Go to Step  12

1. Locate an open or a high resistance in CKT F25.
2. Repair the open or the high resistance in CKT F25.

Did you complete the repair?

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Go to Step  19

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Replace the RH stop lamp. Refer to Tail Lamp Bulb Replacement in Lighting Systems.

Did you complete the repair?

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Go to Step  19

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1. Disconnect the LH stop lamp connector.
2. Press the brake pedal.
3. Use the DMM in order to measure the voltage between terminal A of the LH stop lamp connector and a known good ground.

Is the measured voltage within the specified value?

B+

Go to Step  16

Go to Step  15

1. Locate an open or a high resistance in CKT FB6.
2. Repair the open or the high resistance in CKT FB6.

Did you complete the repair?

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Go to Step  19

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Use the DMM in order to measure the resistance between terminal C of the LH stop lamp connector and a known good ground.

Does the resistance measure less than the specified value?

5 ohms

Go to Step  18

Go to Step  17

1. Locate an open or a high resistance in CKT F125.
2. Repair the open or the high resistance in CKT F125.

Did you complete the repair?

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Go to Step  19

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Replace the LH stop lamp. Refer to Tail Lamp Bulb Replacement in Lighting Systems.

Did you complete the repair?

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Go to Step  19

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1. Connect all connectors and components that were previously disconnected.
2. Verify that the LH and RH stop lamps and the auxiliary brake lamp operate properly

Does the LH and RH stop lamps and the auxiliary brake lamp operate properly?

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Go to Exterior Lights System Check

Go to Step 1