DTC B1318 [AUTO LIGHT/WIPER CONTROL MODULE]

id0902j1831000

DTC B1318

Battery voltage low
DETECTION CONDITION
Input voltage from the battery is excessively low
POSSIBLE CAUSE
•  Open circuit in wiring harness between auto light/wiper control module terminal 1E and battery
•  Open circuit in wiring harness between auto light/wiper control module terminal 2C and battery
•  Short to GND in wiring harness between auto light/wiper control module terminal 1E and battery
•  Short to GND in wiring harness between auto light/wiper control module terminal 2C and battery
•  Battery malfunction
•  Ignition switch malfunction
•  Generator malfunction
•  Auto light/wiper control module malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT DTC FROM PCM
•  Connect the M-MDS to the DLC-2.
•  Are any DTCs from the PCM displayed?
Yes
Perform DTC inspection.
(See DTC TABLE [MZI-3.7].)
Go to Step 6.
No
Go to the next step.
2
INSPECT IGNITION SWITCH
•  Turn the ignition switch to LOCK position.
•  Disconnect the negtive battery cable.
•  Inspect the ignition switch.
•  Is the ignition switch normal?
Yes
Go to the next step.
No
Replace the ignition switch.
(See IGNITION SWITCH REMOVAL/INSTALLATION.)
Go to Step 6.
3
INSPECT AUTO LIGHT/WIPER CONTROL MODULE CONNECTOR
•  Disconnect the auto light/wiper control module connector.
•  Inspect the auto light/wiper control module 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 6.
No
Go to the next step.
4
INSPECT AUTO LIGHT/WIPER CONTROL MODULE POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT
•  Disconnect the negative battery cable.
•  Disconnect the positive battery cable.
•  Inspect for continuity between following terminals:
―  Auto light/wiper control module terminal 1E (wiring harness-side) — battery positive terminal (wiring harness-side)
―  Auto light/wiper control module terminal 2C (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 6.
5
INSPECT AUTO LIGHT/WIPER CONTROL MODULE POWER SUPPLY CIRCUIT FOR SHORT TO GND
•  Inspect for continuity between following terminals:
―  Auto light/wiper control module terminal 1E (wiring harness-side) — body GND
―  Auto light/wiper control module terminal 2C (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.
6
VERIFY TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the auto light/wiper control module memory using the M-MDS.
•  Turn the ignition switch to LOCK position then ON position.
•  Is the same DTC present?
Yes
Replace the auto light/wiper control module.
(See AUTO LIGHT/WIPER CONTROL MODULE REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.