Schematic Reference: Brake Warning System Schematics

1

Did you perform the Hydraulic Brake Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Hydraulic Brakes

1. Turn OFF the ignition.
2. Turn ON the ignition, with the engine OFF.
3. Observe the red Brake indicator.

Does the red Brake indicator illuminate briefly during the bulb check?

Go to Step 3

Go to Step 12

Apply the park brake.

Does the red Brake indicator illuminate?

Go to Step 4

Go to Step 5

1. Turn OFF the ignition.
2. Release the park brake.
3. Disconnect the brake fluid level switch.
4. Connect a 3 amp fused jumper wire between the signal circuit of the brake fluid level switch and the ground circuit of the brake fluid level switch.
5. Turn ON the ignition with the engine OFF.

Does the red Brake indicator illuminate?

Go to Step 10

Go to Step 7

1. Turn OFF the ignition.
2. Release the park brake.
3. Disconnect the park brake switch.
4. Connect a 3 amp fused jumper wire between the signal circuit of the park brake switch and a good ground.
5. Turn ON the ignition with the engine OFF.

Does the red Brake indicator illuminate?

Go to Step 9

Go to Step 6

Test the signal circuit of the park brake switch for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 17

Go to Step 11

Test the signal circuit of the brake fluid level switch for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 17

Go to Step 8

Test the ground circuit of the brake fluid level switch for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 17

Go to Step 12

Inspect for poor connections or a poor case ground at the park brake switch. 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 17

Go to Step 13

Inspect for poor connections at the harness connector of the brake fluid level switch. 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 17

Go to Step 14

Inspect for poor connections at the harness connector of the body control module. 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 17

Go to Step 15

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 17

Go to Step 16

Replace the park brake switch. Refer to Parking Brake Lever Pedal Assembly Replacement in Park Brake.

Did you complete the replacement?

Go to Step 17

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Replace the brake fluid level switch. Refer to Brake Fluid Level Indicator Switch Replacement .

Did you complete the replacement?

Go to Step 17

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Replace the body control module. Refer to Body Control Module Replacement in Body Control System.

Did you complete the replacement?

Go to Step 17

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Replace the EBCM. Refer to Electronic Brake Control Module Replacement in Antilock Brake System.

Did you complete the replacement?

Go to Step 17

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2