Diesel Data: Automotive Repair

Test F: DTC U2472 - Unexpected Ignition State

Pinpoint Test F: DTC U2472 - UNEXPECTED IGNITION STATE

Refer to Vehicle/Diagrams, Power Distribution/SJB for schematic and connector information.

Normal Operation

The ignition switch receives fused battery voltage along circuit SBP27 (BU/RD) from smart junction box (SJB) fuse 27 (20A). The ignition switch then sends that voltage out to the SJB and the battery junction box (BJB) depending on ignition switch position. The SJB monitors circuit CDC32 (BN/YE) (run/start) and circuit CDC33 (VT/GN) (run/accessory) at all times.
^ DTC U2472 Unexpected Ignition State - DTC U2472 will only set during the on-demand self test if the SJB cannot detect the RUN signal or cannot detect the ignition switch state at all during the self-test.

This pinpoint test is intended to diagnose the following:

^ Wiring, terminals or connectors
^ Ignition switch
^ SJB

F1-F2:




F3-F4: