B1310

Steering Column Switches

Pinpoint Test O: DTC B1310:12

Refer to Wiring Diagram Set 13, Power Distribution/SJB for schematic and connector information Electrical Diagrams.

Normal Operation

When the ignition is placed in RUN mode, the Body Control Module (BCM) module provides a ground for the coil (control) side of the run/start relay located in the Battery Junction Box (BJB). The BCM (Body Control Module) monitors the run/start relay control circuit and sets a DTC if the circuit is open, shorted to ground or shorted to voltage.

- DTC B1310:12 (Run/Start Control: Circuit Short to Battery)- This DTC is set if the BCM (Body Control Module) detects a short to battery in the run/start relay control circuit during a BCM (Body Control Module) self-test or during normal operation.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Run/start relay

- BCM (Body Control Module)

PINPOINT TEST O : DTC B1310:12

O1 CHECK THE RUN/START RELAY

- Disconnect: Run/Start Relay.

- Carry out the appropriate relay component test.

Is the relay OK?

Yes
GO to O2.

No
INSTALL a new run/start relay. CARRY OUT a self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.

O2 CHECK THE RUN/START RELAY CONTROL CIRCUIT FOR A SHORT TO VOLTAGE

- Ignition ON.

- Measure and record battery voltage.






- NOTICE: This pinpoint test step directs testing circuits using a back-probe method. Use the special back-probe tool specified in the tool list. Do not force test leads or other probes into connectors. Adequate care must be exercised to avoid connector terminal damage while ensuring that good electrical contact is made with the circuit or terminal. Failure to follow these instructions may cause damage to wiring, terminals, or connectors and subsequent electrical faults

Measure the voltage by backprobing between BCM (Body Control Module) C2280F-18, circuit CDC55 (BN/VT), harness side and ground.


Is the voltage equal to the recorded battery voltage?

Yes
REPAIR circuit CDC55 (BN/VT). CARRY OUT a self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.

No
GO to O3.

O3 CHECK FOR CORRECT BCM (Body Control Module) OPERATION

- Disconnect: All BCM (Body Control Module) Connectors.

- Check the connectors for:
- corrosion

- damaged pins

- pushed-out pins


- Connect: All BCM (Body Control Module) Connectors.

- Connect: Run/Start Relay.

- Make sure the connectors are seated correctly, then carry out a BCM (Body Control Module) self-test.

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

Is the concern still present?

Yes
INSTALL a new BCM (Body Control Module).

CARRY OUT a self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. 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. CARRY OUT a self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.