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: Hydraulic Brake Schematics and Instrument Cluster Schematics | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 | Verify a fault is present. Does the system operate normally? | Go to Testing for Intermittent Conditions and Poor Connections | 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 . 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 . 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 . 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 . 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 . 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 . 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 . Did you find and correct the condition? | Go to Step 19 | Go to Step 16 |
16 | Replace the EBCM. Refer to Control Module References . 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 . Did you find and correct the condition? | Go to Step 19 | Go to Step 18 |
18 | Replace the IPC. Refer to Control Module References . 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 |
