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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 42 (MULTIFUNCTION Electronic Modules -- F250-F550 Super Duty) >> Diagnosis And Testing >> Upfitter Relay Box >> Pinpoint Tests >> Pinpoint Test H: The Upfitter Switch Controlled Component is Inoperative >> Normal Operations

Normal Operations

WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. 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: 

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