Pinpoint Test A : No Power In On: Notes
WARNING: This page is about a different car, the 2018 Lincoln MKC. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Power Distribution for schematic and connector information.
Refer to Starting System for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Steering Wheel and Column Electrical Components - System Operation and Component Description .
When in ON mode, the BCM activates the integral run/start relay and provides a ground 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 BCM fuse 34 (30A). The BJB run/start relay receives voltage from the BJB fuses 11 (30A) and 23 (5A).
BCM DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B108A:01 | Start Button: General Electrical Failure | Sets continuous when the BCM detects a mismatch between the switch input circuits, one indicates closed and one indicates open. |
| B108A:24 | Start Button: Signal Stuck High | Sets continuous when the BCM detects a fault on one of the ignition switch input circuits for 10 seconds or longer. |
| B108A:9E | Start Button: Stuck On | Sets continuous when the BCM detects only one switch input circuit indicating open when the start button is released. |
| B1142:29 | Ignition Status 1: Signal Invalid | Sets during the on-demand self-test when the BCM detects a fault from one of the ignition switch input circuits. |
| B1310:12 | Run/Start Control: Circuit Short To Battery | Sets when the BCM detects a short to voltage from the BJB run/start relay coil control circuit. When this DTC sets, the control side of the run/start relay is disabled. The BCM must pass a self-test in order for the DTC to clear and the BCM to enable control of the run/start relay. |
| B1310:14 | Run/Start Control: Circuit Short to Ground or Open | Sets when the BCM detects an open or a short to ground from the BJB run/start relay coil control circuit. |
Possible Causes
- Battery voltage concern
- Fuse
- Wiring, terminals or connectors
- Run/start relay
- PATS concern
- GSM (includes the ignition switch)
- BCM
Visual Inspection and Diagnostic Pre-checks
- Inspect the battery and battery cables.
- Inspect the BJB fuses 7 (125A), 11 (30A) and 23 (5A).
- Inspect BCM fuse 12 (7.5A) and fuse 34 (30A).