Mazda RX-8 Workshop Manual page 1571

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2011 - RX-8 - Brakes
DTC B1318 [ABS]
CAUTION:
If the battery voltage drops during the inspection, B1318 will be output as a current
malfunction and the proper diagnosis cannot be made. Be careful not to let the battery
voltage drop.
DTC B1318 Power supply
DETECTION
CONDITION
POSSIBLE
CAUSE
The voltage at ABS HU/CM terminal Z is approx. 10 V or less.
Battery deterioration
Generator malfunction
ENGINE 15 A fuse malfunction
Open circuit or short to ground in the wiring harness between the ABS
HU/CM terminal Z and the battery
Open circuit or faulty ground in the wiring harness between the ABS
HU/CM terminal AC and the body ground
Poor connection at connectors (female terminal)
ABS HU/CM malfunction