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DTC B1318

BHE040243000W14

  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 | • The voltage at DSC HU/CM terminal K is approx. 10 V or less.
POSSIBLE CAUSE | • ENGINE 15 A fuse malfunction • Open circuit or short to ground in the wiring harness between the DSC HU/CM terminal K and the battery • Open circuit or faulty ground in the wiring harness between the DSC HU/CM terminal T and the body ground • Battery deterioration • Generator malfunction • Poor connection at connectors (female terminal)

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT BATTERY VOLTAGE • Is the battery terminal voltage normal? | Yes | Make sure that battery terminal connection is normal. Go to the next step.
No | Charge or replace the battery, then go to Step 6. (See BATTERY RECHARGING.) (See BATTERY REMOVAL/INSTALLATION.)
2 | INSPECT BATTERY GRAVITY • Is battery specific gravity as specified? | Yes | Go to the next step.
No | Replace the battery, then go to Step 6. (See BATTERY REMOVAL/INSTALLATION.)
3 | INSPECT CHARGING SYSTEM • Are the generator and drive belt tensions normal? | Yes | Go to the next step.
No | Adjust the drive belt tension if necessary. (See DRIVE BELT ADJUSTMENT.) Replace the generator and/or drive belt if necessary. (See DRIVE BELT REPLACEMENT.) (See GENERATOR REMOVAL/INSTALLATION.)
4 | INSPECT DSC HU/CM POWER SUPPLY FOR OPEN CIRCUIT • Start the engine. • Measure the voltage between DSC HU/CM terminal K and ground. • Is the voltage above 10 V? | Yes | Go to the next step.
No | Repair or replace the wiring harness for open circuit between DSC HU/CM and ground, then go to Step 6.
5 | INSPECT DSC HU/CM GROUND FOR POOR GROUND OR OPEN CIRCUIT • Turn the ignition switch off. • Measure the resistance between ground and DSC HU/CM terminal T. • Is the resistance within 0-1 ohm? | Yes | Go to the next step.
No | If there is no continuity: • Repair or replace the wiring harness for open circuit between the DSC HU/CM and ground, then go to the next step. If resistance is not within 0-1 ohm: • Repair or replace harness for poor ground then go to the next step.
6 | VERIFY TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the memory. (See Clearing DTCs Procedures.) • Is the same DTC present? | Yes | Replace the DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION.)
No | Go to the next step.
7 | VERIFY AFTER REPAIR PROCEDURE • Are any other DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC Table.)
No | DTC troubleshooting completed.