Pinpoint Test AA: DTC B1318

Handles, Locks, Latches and Entry Systems

Pinpoint Test AA: DTC B1318

Normal Operation

The Driver Door Module (DDM) monitors the voltage from the battery to determine if it goes above or below specific thresholds and sets DTC B1318 in continuous memory if the DDM (Driver Door Module) detects low battery voltage below 10 volts on circuit SBP13.

- DTC B1318 (Battery Voltage Low)- a continuous memory DTC that sets when the DDM (Driver Door Module) detects battery voltage below 10 volts on circuit SBP13.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- High circuit resistance

- DDM (Driver Door Module)

PINPOINT TEST AA : DTC B1318

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings.

AA1 RECHECK THE DDM (Driver Door Module) DTCs

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: DDM (Driver Door Module) Self-Test.

- Clear the DTCs. Repeat the DDM (Driver Door Module) self-test.

Is DTC B1318 still present?

Yes
GO to AA2.

No
The system is operating normally at this time. The DTC may have been set previously during battery charging or while jump starting the vehicle.

AA2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM

- Enter the following diagnostic mode on the scan tool: PCM Self-Test.

- Retrieve the continuous memory DTCs from the PCM.

Is DTC P0620, P0625, P0626 or P065B set in the PCM?

Yes
REFER to Charging System.

No
GO to AA3.

AA3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE

- Ignition OFF.

- Check the battery condition and verify the battery is fully charged.

Is the battery OK and fully charged?

Yes
GO to AA4.

No
REFER to Charging System.

AA4 CHECK THE DDM (Driver Door Module) VOLTAGE SUPPLY

- Measure and record the voltage at the battery.

- Disconnect: DDM (Driver Door Module) C501A.

- Ignition ON.

- Measure the voltage between the DDM (Driver Door Module) C501A-1, circuit SBP13 (GY/RD), harness side and ground.





Is the voltage within 0.2 volt of the recorded battery voltage?

Yes
GO to AA5.

No
REPAIR the circuit for high resistance. CLEAR the DTC. REPEAT the self-test.

AA5 CHECK THE DDM (Driver Door Module) GROUND CIRCUIT

- Ignition OFF.

- Disconnect: Negative Battery Cable.

- Measure the resistance between the DDM (Driver Door Module) C501A-24, circuit GD133 (BK), harness side and ground.





Is the resistance less than 5 ohms?

Yes
CONNECT the negative battery cable. GO to AA6.

No
REPAIR the circuit for high resistance. CONNECT the negative battery cable. TEST the system for normal operation.

AA6 CHECK FOR CORRECT DDM (Driver Door Module) OPERATION

- Disconnect the DDM (Driver Door Module) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect the DDM (Driver Door Module) connectors and make sure they seat correctly.

- Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new DDM (Driver Door Module). REFER to Driver Door Module (DDM) . TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.