Test G: DTC B1555 - Ignition Run/Start Circuit Failure

Pinpoint Test G: DTC B1555 - Ignition Run/Start Circuit Failure
Refer to Vehicle/Diagrams, Four-Wheel Drive System for schematic and connector information.

Normal Operation
The 4X4 control module receives ignition switch position status from the hard-wired run/start input to 4X4 control module pin 8 and the ignition switch position status message communicated by the instrument cluster (IC) over the high-speed controller area network (HS-CAN). The ignition switch position status message originates from the smart junction box (SJB) which communicates the ignition switch position status over the medium-speed controller area network (MS-CAN) to the IC which acts as a gateway module, transferring the ignition switch status message from MS-CAN to HS-CAN. For information regarding network messaging, refer to Information Bus (Multiplex Communications Network).
^ DTC B 1555 Ignition Run/Start Circuit Failure -If the ignition switch is not in RUN for the self test, this code will set.

This pinpoint test is intended to diagnose the following:
^ Fuse
^ Wiring, terminals or connectors
^ Ignition switch and/or circuitry
^ HS-CAN

G1-G3: