DTC C1189 [BCM]

id0902f5836600

Description | Brake fluid level sensor circuit malfunction
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Detection condition | • Short to ground in brake fluid level sensor circuit with the brake fluid level on the upper side of the MIN.
Possible cause | • Brake fluid level sensor connector or terminal malfunction • Brake fluid level sensor malfunction • BCM connector or terminal malfunction • Short to ground in wiring harness between brake fluid level sensor terminal B and BCM terminal 1D • BCM malfunction

Diagnostic procedure

Step | Inspection | Action
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1 | INSPECT BRAKE FLUID LEVEL SENSOR CONNECTOR • Turn the ignition switch to the OFF position. • Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Disconnect the brake fluid level sensor connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is there any malfunction? | Yes | Repair or replace the connector, then go to Step 5.
No | Go to the next step.
2 | INSPECT BRAKE FLUID LEVEL SENSOR • Inspect the brake fluid level sensor. (See BRAKE FLUID LEVEL SENSOR INSPECTION.) • Is there any malfunction? | Yes | Replace the reserve tank, then go to Step 5. (See MASTER CYLINDER REMOVAL/INSTALLATION [L.H.D.].) (See MASTER CYLINDER REMOVAL/INSTALLATION [R.H.D.].)
No | Go to the next step.
3 | INSPECT BCM CONNECTOR • Disconnect the BCM connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is there any malfunction? | Yes | Repair or replace the connector, then go to Step 5.
No | Go to the next step.
4 | INSPECT FOR SHORT TO GROUND IN BRAKE FLUID LEVEL SENSOR CIRCUIT • Verify that the brake fluid level sensor and BCM connectors are disconnected. • Inspect for continuity between brake fluid level sensor terminal B (wiring harness-side) and body ground. • Is there continuity? | Yes | Repair or replace the wiring harness which has a short to ground, then go to the next step.
No | Go to the next step.
5 | VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Reconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Clear the DTC for the BCM using the M-MDS. (See CLEARING DTC [BCM].) • Retrieve the BCM DTCs using the M-MDS with the brake fluid level on the upper side of the MIN. (See DTC INSPECTION [BCM].) • Is the same DTC displayed? | Yes | Repeat the inspection from Step 1. • If the malfunction recurs, replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.) Go to the next step.
No | Go to the next step.
6 | VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed? | Yes | Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [BCM].)
No | DTC troubleshooting completed.