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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 C: All The Instrument Panel Illumination Does Not Dim >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2008 Ford Pickup, 2008 Ford F550 Super Duty, 2008 Ford F450 Super Duty, and 2008 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The smart junction box (SJB) monitors the input from the instrument panel dimmer switch by sending a voltage reference signal through circuit VLN18 (BU/WH) to the instrument panel dimmer switch. The return signal is sent through circuit RLN29 (WH/OG) back to the SJB. Based on the input from the instrument panel dimmer switch, the SJB sends a pulse-width modulated (PWM) voltage signal to the dimmable illumination sources. If the SJB detects a concern with the circuitry to the instrument panel dimmer switch, the SJB defaults the backlighting to a full intensity level.

The SJB also sends a message over the medium speed controller area network (MS-CAN) to the audio control module (ACM) (except base AM/FM), the rear entertainment module (RETM), the climate control module and the instrument cluster (IC) to indicate the backlighting intensity level. The trailer brake controller (TBC) receives the message on the high speed controller area network (HS-CAN) from the IC.

If the ACM (except base AM/FM), the RETM, the IC, or the TBC module receives invalid or missing backlighting data from the SJB, the receiving module defaults the backlighting to full intensity.

If the climate control module receives invalid or missing backlighting data for 5 seconds or less from the SJB, the climate control module defaults to the last setting received. If the climate control module receives invalid or missing backlighting data for more than 5 seconds from the SJB, the climate control module defaults the backlighting to full intensity.

DTC B2212 (panel dim switch out of range) - is an on-demand DTC that sets when the SJB detects an out of range condition on the dimmer input switch circuit.

This pinpoint test is intended to diagnose the following:

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