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Home >> Ford >> 2003 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2551 (Instrument Cluster Illumination And Panel Illumination -- F250-F550 Super Duty) >> Diagnosis And Testing >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test E: The Steering Wheel Switch Illumination Is Inoperative >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2010 Ford Pickup, 2010 Ford F550 Super Duty, 2010 Ford F450 Super Duty, and 2010 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The Smart Junction Box (SJB) sends a Pulse Width Modulated (PWM) voltage to the steering wheel switches. The voltage passes through the clockspring to the steering wheel harness and on to the steering wheel switches.

This pinpoint test is intended to diagnose the following: 

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