DTC B1318 [AUTO LIGHT/WIPER CONTROL MODULE]SM2445967
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 1L 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 1L and battery
• Short to GND in wiring harness between auto light/wiper control module terminal 2C and battery
• Battery 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 [L3 Turbo].)
(See DTC TABLE [L5].)
(See DTC TABLE [MZR-CD 2.2].)
Go to Step 5.
No
Go to the next step.
2
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 5.
No
Go to the next step.
3
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 1L (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 5.
4
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 1L (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.
5
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.