Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

1. Observe the stop lamps.
2. Press and release the brake pedal.

Do the stop lamps operate properly?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Press and release the brake pedal.

Does the bass relay turn ON and OFF?

Go to Step 4

Go to Step 5

1. Turn OFF the ignition.
2. Disconnect the bass relay. Refer to Relay Replacement in Wiring Systems.
3. Turn ON the ignition, with the engine OFF.

Do the stop lamps turn OFF?

Go to Step 5

Go to Step 7

1. Turn OFF the ignition.
2. Connect a test lamp between the coil side supply voltage circuit of the bass relay and the control circuit of the bass relay.
3. Turn ON the ignition, with the engine OFF.
4. Press and release the brake pedal.

Does the test lamp turn ON and OFF?

Go to Step 8

Go to Step 6

Test the control circuit of the bass relay for a short ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 9

Test the stop lamp switch signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 8

Inspect for poor connections at the bass relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 10

Inspect for poor connections at the harness connector of the electronic brake control module (EBCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 11

Replace the bass relay. Refer to Relay Replacement in Wiring Systems.

Did you complete the replacement?

Go to Step 12

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1. Replace the EBCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming.
2. Perform the brake pedal position (BPP) sensor recalibration procedure. Refer to Brake Pedal Position Sensor Calibration .

Did you complete the replacement?

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 2