Tests AE: DTC B1557 - Ignition RUN/START Circuit Short To Battery

PINPOINT TEST AE: DTC B1557 - IGNITION RUN/START CIRCUIT SHORT TO BATTERY

AE1-AE4:

Normal Operation
With the ignition switch in the START or RUN position, the instrument cluster receives voltage from the smart junction box (SJB) through circuits 489 (PK/BK) and 1266 (RD/YE). With the ignition switch in the OFF position, the instrument cluster receives its keep-alive voltage from the SJB through circuit 1001 (WH/YE). The instrument cluster is grounded through circuit 1205 (BK).

DTC B1557 - is a continuous DTC that sets if the instrument cluster receives a voltage input on circuit 489 (PK/BK) and a message from the SJB indicating that the ignition switch has transitioned to the OFF or ACC position.

Possible Causes
- Circuit 489 (PK/BK) short to voltage
- SJB
- Instrument cluster