Normal Operation

When the ignition switch is turned to the RUN position, a voltage signal is sent to the Body Control Module (BCM). The BCM then activates the run/start relay and the run/acc relay, which distribute fused voltage to various components. The run/acc relay is serviced as part of the BCM.

• DTC B1310:14 (Run/Start Control: Circuit Short to Ground or Open) - the BCM continuously monitors the control side of the run/start relay. This DTC sets if the BCM detects an open or a short to ground on the control circuit. The BCM uses a Field-Effect Transistor (FET) to control the run/start relay. When this DTC sets, the control side of the run/start relay is disabled via the FET. Once the condition that caused the DTC to set is repaired, the BCM must pass a self-test in order for the DTC to clear and the system to resume normal operation.

This pinpoint test is intended to diagnose the following: 

• Fuse
• Wiring, terminals or connectors
• Ignition switch
• Run/start relay
• BCM