DTC C1189

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DTC C1189

B3E090201072W51

DTC C1189 | Brake fluid level sensor input circuit open
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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
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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. (See BRAKE FLUID LEVEL SENSOR INSPECTION.) • 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.
(See PASSENGER JUNCTION BOX (PJB) REMOVAL/INSTALLATION.)

No | Troubleshooting completed.