DTC B1318

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DTC B1318

B3E090201072W07

DTC B1318 | Battery voltage low
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DETECTION CONDITION | Input voltage from the battery is excessively low

POSSIBLE CAUSE

• Open circuit in wiring harness between PJB terminal J-01 F and battery
• Open circuit in wiring harness between PJB terminal J-03 AP and battery
• Short to GND in wiring harness between PJB terminal J-01 F and battery
• Short to GND in wiring harness between PJB terminal J-03 AP and battery
• Battery malfunction
• Generator malfunction
• PJB malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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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 [LF].) (See DTC TABLE [ZJ, Z6].) 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 PJB POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT
• Disconnect the negative battery cable.
• Disconnect the positive battery cable.
• Inspect for continuity between following terminals:

  - PJB terminal J-01 F (wiring harness-side) - battery positive terminal (wiring harness-side)
  - PJB terminal J-03 AP (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 PJB POWER SUPPLY CIRCUIT FOR SHORT TO GND
• Inspect for continuity between following terminals:

  - PJB terminal J-01 F (wiring harness-side) - body GND
  - PJB terminal J-03 AP (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 PJB memory using the WDS or equivalent. • Turn the ignition switch to LOCK position then ON position. • Is the same DTC present? | Yes | Replace the PJB. (See PASSENGER JUNCTION BOX (PJB) REMOVAL/INSTALLATION.)
No | DTC troubleshooting completed.