Pinpoint Test C : No Power In On - Conventional Ignition Switch: Notes
Refer to Power Distribution for schematic and connector information.
Normal Operation and Fault Conditions
When the ignition switch is turned to the RUN position, a voltage signal is sent to the BCM. The BCM then activates the integral run/start relay and sends a signal to activate the BJB run/start relay, which distributes fused voltage to various components. The integral run/start relay in the BCM receives voltage from the high current BJB fuse 2 (125A). The run/start relay in the BJB receives voltage from the battery through the high current BJB.
BCM DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1142:29 | Ignition Status 1: Signal Invalid | Sets when the BCM does not receive a valid ignition signal during a BCM self-test. |
| B1310:14 | Run/Start Control: Circuit Short to Ground or Open | The BCM continuously monitors the control side of the run/start relay in the BJB. This DTC sets if the BCM detects an open or a short to ground from the control circuit. When this DTC sets, the control side of the run/start relay is disabled via the Field-Effect Transistor (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 |
Possible Causes
- Wiring, terminals or connectors
- Run/start relay
- Ignition switch
- BCM
Visual Inspection and Diagnostic Pre-checks
- Inspect BCM fuse 18 (5A).
- Inspect the BCM fuse 34 (30A).
- Inspect the high current BCM fuse 2 (125A).