#
DTC B1318

id0902j0831000

DTC B1318 | Battery voltage low
--- | ---
DETECTION CONDITION | Input voltage from the battery is excessively low
POSSIBLE CAUSE | • Open circuit in wiring harness between BCM terminal 3J and battery • Short to GND in wiring harness between BCM terminal 3J and battery • Battery malfunction • Generator malfunction • BCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT DTC FROM PCM • Connect the WDS or equivalent to the DLC-2. • Are any DTCs from the PCM displayed? | Yes | Perform DTC inspection. (See DTC TABLE [L8, LF, L3].) (See DTC TABLE [MZR-CD (RF Turbo)].) Go to Step 5.
No | Go to the next step.
2 | INSPECT BCM CONNECTOR • Disconnect the BCM connector. • Inspect the BCM 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 BCM POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT • Disconnect the negative battery cable. • Disconnect the positive battery cable. • Inspect for continuity between following terminals: - BCM terminal 3J (wiring harness-side) - battery positive terminal (wiring harness-side) • 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 BCM POWER SUPPLY CIRCUIT FOR SHORT TO GND • Inspect for continuity between following terminals: - BCM terminal 3J (wiring harness-side) - body GND • Is there continuity? | Yes | Repair or replace the wiring harness for a possible short to GND, 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 BCM memory using the WDS or equivalent. • Turn the ignition switch to LOCK position then ON position. • Is the same DTC present? | Yes | Replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
No | DTC troubleshooting completed.