For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Hydraulic Brake Schematics Connector End View Reference: Antilock Brake System Connector End Views
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 | Inspect the brake fluid level. Is the brake fluid level OK? | Go to Step 3 | Go to Hydraulic Brake System Bleeding
3 |

1. Key on, engine off.
2. Release the park brake.
3. With a scan tool, observe the Park Brake Switch parameter in the Instrument Panel Cluster data list.

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

Go to Step 4

Go to Step 5

4 | With a scan tool, observe the Brake Fluid Switch parameter in the Instrument Panel Cluster data list. Does the scan tool indicate that the Brake Fluid Switch parameter is OK? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 6
5 |

1. Turn OFF the ignition.
2. Disconnect the parking brake switch.
3. Key on, engine off.
4. With a scan tool, observe the Parking Brake Switch parameter.

Does the scan tool indicate that the Parking Brake Switch parameter is Off?

Go to Step 9

Go to Step 7

6 |

1. Turn OFF the ignition.
2. Disconnect the brake fluid level switch.
3. Key on, engine off.
4. With a scan tool, observe the Brake Fluid Level parameter.

Does the scan tool indicate that the Brake Fluid Switch parameter is OK?

Go to Step 10

Go to Step 8

7 | Test the signal circuit of the park brake switch for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 11
8 | Test the signal circuit of the brake fluid level switch for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 11
9 | Inspect for poor connections at the harness connector of the parking brake switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 12
10 | 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 . Did you find and correct the condition? | Go to Step 15 | Go to Step 13
11 | Inspect for poor connections at the harness connector of the instrument panel cluster (IPC). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 14
12 | Replace the parking brake switch. Refer to Parking Brake Indicator Switch Replacement . Did you complete the replacement? | Go to Step 15 | --
13 | Replace the brake fluid level switch. Refer to Brake Fluid Level Indicator Switch Replacement . Did you complete the replacement? | Go to Step 15 | --
14 | Replace the IPC. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 15 | --
15 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2