DTC C1189

id0902j0836600

DTC C1189

Brake fluid level sensor input circuit open

DETECTION CONDITION

Open circuit in wiring harness between PJB and brake fluid level sensor

POSSIBLE CAUSE

• Open circuit in wiring harness between PJB terminal J-01 AL and brake fluid level sensor terminal B
• Open circuit in wiring harness between brake fluid level sensor terminal A and body GND
• Brake fluid level sensor malfunction
• PJB malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
INSPECT BRAKE FLUID LEVEL SENSOR CONNECTOR
• Turn the ignition switch off.
• Disconnect the brake fluid level sensor connector.
• Inspect the brake fluid level sensor connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 5.
No
Go to the next step.
2
INSPECT PJB CONNECTOR
• Disconnect the PJB connector.
• Inspect the PJB connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 5.
No
Go to the next step.
3
INSPECT BRAKE FLUID LEVEL SENSOR SIGNAL CIRCUIT FOR OPEN CIRCUIT
• Inspect for continuity between following terminals:
- PJB terminal J-01 AL (wiring harness-side) - brake fluid level sensor terminal B (wiring harness-side)
- Brake fluid level sensor terminal A (wiring harness-side) - body GND
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to Step 5.
4
INSPECT BRAKE FLUID LEVEL SENSOR
• Inspect the brake fluid level sensor.
• Is there any malfunction?
Yes
Replace the brake fluid level sensor, then go to the next step.
No
Go to the next step.
5
VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PJB memory using the WDS or equivalent.
• Perform the self-test.
(See PJB SELF-TEST.)
• Is the same DTC present?
Yes
Replace the PJB.
No
Troubleshooting completed.