Normal Operation
WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
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 B1556 (Ignition RUN/START Circuit Open) - is a continuous and on-demand DTC that sets in the instrument cluster if the instrument cluster (IC) receives a network message from the SJB indicating that the ignition switch is in the RUN or START position and there is no voltage on the instrument cluster (IC) run/start circuit 489 (PK/BK).
This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Wiring, terminals or connectors
- Instrument cluster (IC)