Did you perform the Hydraulic Brake Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Hydraulic Brakes

Inspect the brake fluid level.

Is the brake fluid level OK?

Go to Step 3

Go to Brake Fluid Leak

1. Turn ON the ignition, with the engine OFF.
2. Disengage the park brake.
3. With a scan tool, observe the Park Brake Switch parameter in the IPC Inputs data list.

Does the scan tool indicate that the Park Brake Switch parameter is On?

Go to Step 5

Go to Step 4

With a scan tool, observe the Low Brake Fluid parameter in the IPC Inputs data list.

Does the scan tool indicate that the Low Brake Fluid parameter is Low?

Go to Step 6

Go to Step 7

1. Disconnect the park brake warning lamp switch.
2. With a scan tool, observe the Park Brake Switch parameter.

Does the scan tool indicate that the Park Brake Switch parameter is On?

Go to Step 8

Go to Step 12

1. Disconnect the brake fluid level switch.
2. With a scan tool, observe the Low Brake Fluid parameter.

Does the scan tool indicate that the Low Brake Fluid parameter is Low?

Go to Step 9

Go to Step 13

7

1. Turn OFF the ignition.
2. Disconnect the brake fluid level switch.
3. Connect a 3 amp fused jumper wire between the signal circuit of the brake fluid level switch and a good ground.
4. Turn ON the ignition, with the engine OFF.
5. With a scan tool, observe the Low Brake Fluid parameter.

Does the scan tool indicate that the Low Brake Fluid parameter is Low?

Go to Step 11

Go to Step 10

1. Turn OFF the ignition.
2. Test the signal circuit of the park brake warning lamp switch for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 14

1. Turn OFF the ignition.
2. Test the signal circuit of the brake fluid level switch for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 14

Test the signal circuit of the brake fluid level switch for a short to voltage, 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 18

Go to Step 14

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 18

Go to Step 13

Inspect for poor connections at the harness connector of the park brake warning lamp 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 18

Go to Step 15

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 18

Go to Step 16

Inspect for poor connections at the harness connector of the instrument cluster. 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 18

Go to Step 17

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

Did you complete the replacement?

Go to Step 18

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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 18

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Replace the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.

Did you complete the replacement?

Go to Step 18

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2