Mazda CX-7 2007 Workshop Manual page 1366

DTC B1318[BCM]
DTC B1318 Battery voltage low
DETECTION Input voltage from the battery is excessively low
CONDITION
• Open circuit in wiring harness between BCM terminal 4I and battery
• Open circuit in wiring harness between BCM terminal 4J and battery
• Open circuit in wiring harness between BCM terminal 1I and battery
• Short to GND in wiring harness between BCM terminal 4I and battery
POSSIBLE
• Short to GND in wiring harness between BCM terminal 4J and battery
CAUSE
• Short to GND in wiring harness between BCM terminal 1I and battery
• Battery malfunction
• Generator malfunction
• BCM malfunction
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BATTERY
IGNITION SWITCH WIRING
HARNESS-SIDE CONNECTOR
E
F
09-02F–4
ON-BOARD DIAGNOSTIC [BCM]
IGNITION SWITCH
E
+
C A
1O
D B
1P
C
BCM WIRING HARNESS-SIDE
CONNECTOR
1M 1K 1I 1G 1E 1C 1A
1N 1L 1J 1H 1F 1D 1B
id0902f5831000
BCM
4I
4J
1I
4I 4G 4A
4J 4H 4F 4D 4B