Seats

Seats

Pinpoint Test AW: DTC B1318

Refer to Wiring Diagram Set 13, Power Distribution/SJB for schematic and connector information. [1][2]Diagrams By Number

Normal Operation

The Driver Seat Module (DSM) monitors the voltage from the battery to determine if it goes above or below specific thresholds.

- DTC B1318 (Battery Voltage Low)- a continuous memory or on-demand DTC that sets when the DSM (Driver Seat Module) detects battery voltage below 10 volts on circuit SBB32.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- High circuit resistance

- DSM (Driver Seat Module)

PINPOINT TEST AW : 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.

AW1 RECHECK THE DSM (Driver Seat Module) DTCs

- Ignition ON.

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

- Clear the DTCs. Repeat the DSM (Driver Seat Module) self-test.

Is DTC B1318 still present?

Yes
GO to AW2.

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.

AW2 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 AW3.

AW3 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 AW4.

No
REFER to Charging System.

AW4 CHECK THE DSM (Driver Seat Module) VOLTAGE SUPPLY

- Measure and record the voltage at the battery.

- Disconnect: DSM (Driver Seat Module) C3299A.

- Ignition ON.

- Measure the voltage between the DSM (Driver Seat Module) C3299A-1, circuit SBB32 (VT/RD), harness side and ground.





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

Yes
GO to AW5.

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

AW5 CHECK THE DSM (Driver Seat Module) GROUND CIRCUITS

- Ignition OFF.

- Disconnect: Negative Battery Cable.

- Disconnect: DSM (Driver Seat Module) C3299B.

- Measure the resistance between the DSM (Driver Seat Module) C3299A-2, circuit GD126 (BK/WH), harness side and ground.





- Measure the resistance between the DSM (Driver Seat Module) C3299B-24, circuit GD126 (BK/WH), harness side and ground.





Are the resistances less than 5 ohms?

Yes
CONNECT the negative battery cable. GO to AW6.

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

AW6 CHECK FOR CORRECT DSM (Driver Seat Module) OPERATION

- Disconnect the DSM (Driver Seat Module) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect the DSM (Driver Seat 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 DSM (Driver Seat Module). REFER to Driver Seat Module (DSM) . 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.