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

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

Normal Operation
With the ignition switch in the START or RUN position, the instrument cluster (IC) 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 (IC) receives its keep-alive voltage from the SJB through circuit 1001 (WH/YE). The instrument cluster (IC) is grounded through circuit 1205 (BK).

- DTC B1557 (Ignition RUN/START Circuit Short to Battery) - is a continuous DTC that sets in the instrument cluster (IC) if the instrument cluster (IC) 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.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- SJB
- Instrument cluster (IC)

AH1-AH4: