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Home >> Ford >> 2009 >> Fusion S, Automatic >> Repair and Diagnosis >> Electrical >> Gauges >> Instrument Cluster Illumination & Instrument Panel Illumination >> Diagnostic Tests >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test B: The Steering Wheel Controls Illumination Is Inoperative >> Normal Operation

Normal Operation

The smart junction box (SJB) sends a pulse width modulated (PWM) voltage to the steering wheel controls through circuit VLN04 (VT/GY) to the clockspring. The PWM signal passes through the clockspring to circuit VLN04 (VT/GY) to the LH and RH control switches. Ground to the LH and RH steering wheel switch is supplied through circuit GD165 (BK).

This pinpoint test is intended to diagnose the following: