Normal Operations
WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
With the ignition is in the RUN or ACC state, voltage is supplied to the upfitter switches from the Body Control Module (BCM). When an upfitter switch is activated (moved to the on position), voltage is routed to the coil side of the corresponding upfitter relay.
Each of the upfitter relays (switch side) are supplied voltage at all times from independent circuits (2 from the BCM and 2 from the Battery Junction Box (BJB)). When the upfitter relay is switched activated, the relay energizes and supplies voltage to the customer supplied accessory.
All of the upfitter relays and the upfitter switch illumination share the same ground circuit.
This pinpoint is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Customer installed accessory
- Upfitter relay
- Upfitter switch
- BCM