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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1396 (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

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. 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 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:

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