Circuit Description
The instrument panel cluster (IPC) illuminates the red brake warning indicator by supplying ground to the lamp. The electronic brake control module (EBCM) sends a class 2 message to the IPC requesting illumination. The park brake switch is wired to the IPC logic. The red brake warning indicator also illuminates when the park brake is applied.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Brake Warning System Schematics and Instrument Cluster Schematics in Instrument Panel, Gages, and Console | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 | Verify a fault is present. Does the system operate normally? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the brake warning indicator illuminate? | Go to Step 4 | Go to Step 18 |
4 | Apply the park brake. Does the brake warning indicator illuminate? | Go to Step 5 | Go to Step 6 |
5 |
Does the brake warning indicator illuminate? | Go to Step 13 | Go to Step 7 |
6 |
Does the brake warning indicator illuminate? | Go to Step 11 | Go to Step 8 |
7 | Connect a fused jumper wire between the brake fluid level switch output circuit and a good ground. Refer to Using Fused Jumper Wires in Wiring Systems. Does the brake warning indicator illuminate? | Go to Step 9 | Go to Step 10 |
8 |
Did you find and correct the condition? | Go to Step 19 | Go to Step 17 |
9 | Repair the open in the ground circuit of the brake fluid level switch. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 19 | -- |
10 | Test the brake fluid level switch input circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 19 | Go to Step 15 |
11 | Inspect for poor connections at the harness connector of 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 19 | Go to Step 12 |
12 | Replace the park brake switch. Refer to Parking Brake Indicator Switch Replacement in Park Brake. Did you complete the replacement? | Go to Step 19 | -- |
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 19 | Go to Step 14 |
14 | Replace the brake fluid level switch. Refer to Brake Fluid Level Indicator Switch Replacement . Did you complete the replacement? | Go to Step 19 | -- |
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 19 | Go to Step 16 |
16 | Replace the EBCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 19 | -- |
17 | Inspect for poor connections at the harness connector of the IPC. 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 19 | Go to Step 18 |
18 | Replace the IPC. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 19 | -- |
19 | Verify the system is repaired. Does the system operate normally? | System OK | Go to Step 3 |
