Test A: The Ignition Switch is Inoperative

Pinpoint Test A: The Ignition Switch is Inoperative

Normal Operation
The smart junction box (SJB) receives fused battery power from the battery junction box (BJB) fuse 17 (50A) circuit 16 (RD/LG) and fuse 1 (25A) circuit 37 (YE). The SJB then provides the ignition switch with fused battery power through fuse 4 (10A) circuit 1715 (RD). The ignition switch has 4 possible states:
^ OFF - No power on any circuit to the SJB.
^ RUN/ACC - Power on circuit 297 (BK/LG) to the SJB.
^ RUN/START - Power on circuit 306 (TN/LB) to the starter relay and power on circuit 1050 (LG/VT) to the SJB.
^ RUN - Power on circuits 1050 (LG/VT) and 297 (BK/LG) to the SJB.

A1:

A1-A4:

CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

Possible Causes
^ Circuit 1715 (RD) open
^ Fuse(s)
^ Ignition switch
^ SJB