DTC B1318 [Auto Light/Wiper Control Module]: Notes
DTC B1318 (AUTO LIGHT/WIPER CONTROL MODULE) DETECTION CONDITION AND POSSIBLE CAUSE
| DESCRIPTION |
Low voltage of battery power supply |
| DETECTION CONDITION |
- Auto light/wiper control module power supply circuit voltage is excessively low.
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| POSSIBLE CAUSE |
- PCM DTC is stored
- Charging system malfunction
- Auto light/wiper control module connector or terminals malfunction
- Open circuit or short to ground in auto light/wiper control module power supply circuit
- Short to ground in wiring harness between auto light/wiper control module terminal A-Ignition switch terminal A/Relay block terminal 1B
- METER 15 A fuse malfunction
- Open circuit in wiring harness between auto light/wiper control module terminal A-Ignition switch terminal A/Relay block terminal 1B
- Auto light/wiper control module malfunction
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 Courtesy of MAZDA MOTORS CORP.
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