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Home >> Ford >> 2002 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2466 (Instrument Cluster System And Panel Illumination -- F250-F550 Super Duty) >> Diagnostic Tests >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test G: The Audio Control Module (ACM) Illumination Is Inoperative >> Normal Operation

Normal Operation

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For the base ACM (AM/FM only), the smart junction box (SJB) supplies a pulse-width modulated (PWM) voltage to the ACM illumination on circuit VLN04 (VT/GY) based on input from the instrument panel dimmer switch. Ground is provided by circuit GD115 (BK/GY).

For all ACMs except base (AM/FM), the smart junction box (SJB) sends a message over the controller area network (CAN) to the ACM based on input from the instrument panel dimmer switch.

This pinpoint test is intended to diagnose the following:

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