BRAKE FLUID SWITCH CIRCUIT OPEN
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the ignition in the Run/Start position.
- Set Condition:
The cluster performs open circuit detection on the Brake Fluid Level (Red Brake Warning Indicator Driver) switch and the sense circuit. Fault sets if an open circuit is detected. When this fault is detected the cluster will illuminate the Brake warning indicator.
| Possible Causes |
| INTERMITTENT CONDITION |
| BRAKE FLUID LEVEL SWITCH |
| (Z932) BRAKE FLUID LEVEL SWITCH GROUND CIRCUIT |
| (B20) RED BRAKE WARNING INDICATOR DRIVER CIRCUIT |
| INSTRUMENT CLUSTER |
Diagnostic Test
1. INTERMITTENT CONDITIONNOTE: Ensure that the Brake Fluid Level Switch harness connector is properly connected.
With the scan tool, erase DTCs.
Cycle the ignition and wait approximately 15 seconds.
With the scan tool, read DTCs.
Does the scan tool display: BRAKE FLUID SWITCH CIRCUIT OPEN?
Yes
- Go To2
No
- The condition is not present at this time. Monitor scan tool parameters while wiggling the related wire harness. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness and connectors.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
2. BRAKE FLUID LEVEL SWITCH
Turn the ignition off.
Disconnect the Brake Fluid Level Switch harness connector.
Check connectors - Clean/repair as necessary.
Measure the internal resistance of the Brake Fluid Level (Red Brake Warning Indicator Driver) Switch.
Is the resistance above 1.1k (1,100) ohms?
Yes
- Replace the Brake Fluid Level (Red Brake Warning Indicator Driver) Switch in accordance with the Service Information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Go To3
3. (Z932) BRAKE FLUID LEVEL SWITCH GROUND CIRCUIT
Turn the ignition off.
Disconnect the Brake Fluid Level Switch harness connector.
Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the (Z932) Brake Fluid Level Switch Ground circuit.
Is the resistance above 5.0 ohms?
Yes
- Repair the (Z932) Brake Fluid Level (Red Brake Warning Indicator Driver) Switch Ground circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Go To4
4. (B20) RED BRAKE WARNING INDICATOR DRIVER CIRCUIT OPEN
Turn the ignition off.
Disconnect the Brake Fluid Level Switch harness connector.
Disconnect the Instrument Cluster harness connector.
Measure the resistance of the (B20) Red Brake Warning Indicator Driver circuit.
Is the resistance above 5.0 ohms?
Yes
- Repair the (B20) Red Brake Warning Indicator Driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Replace and configure the Instrument Cluster in accordance with the Service Information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)