PINPOINT TEST E : No Power in RUN-No Power in START - Vehicles with a Start-Stop Switch: Notes
Diagnostic Overview
No Power in RUN-No Power in START - Vehicles with a Start-Stop Switch
Refer to Power Distribution/BCM for schematic and connector information.
Refer to Starting System for schematic and connector information.
Normal Operation and Fault Conditions
When in RUN mode, the BCM provides a ground for the coil (control) side of the RUN/START relay located in the BJB. The BCM monitors the RUN/START relay control circuit; a DTC sets if the circuit is shorted to ground or open.
The start/stop switch provides a voltage and ground input to the BCM, the RFA module and the PCM. The 3 modules exchange information over the HS-CAN to determine if starting the engine is authorized. If the PATS authorizes the starting of the engine, the PCM supplies power and ground to the starter relay.
To place the vehicle in RUN mode, locate the Intelligent Access (IA) key inside the vehicle and press the start/stop switch once, for at least one second, without applying the brake pedal. To start the engine, locate the Intelligent Access (IA) key inside the vehicle and press the start/stop switch while the brake pedal is applied.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| 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 is set if the BCM detects an open or a short to ground on the control circuit. The BCM uses a 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. |
Visual Inspection and Diagnostic Pre-checks
Make sure the battery and battery cables are OK.
Make sure high current BJB fuse B (100A) is OK.
Make sure BJB fuse 87 (5A) is OK.