Normal Operation

The Smart Junction Box (SJB) monitors the input from the instrument panel dimmer switch by sending a voltage signal to the instrument panel dimmer switch. The return signal is sent 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 and a network message to indicate the backlighting brightness level to the modules that control their own dimmable backlighting. 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.

• DTC B2212 (Panel Dim Switch Out of Range) - an on-demand DTC that sets when the SJB  detects an open or short to voltage from the dimmer input switch circuit.

  This pinpoint test is intended to diagnose the following: 

• Wiring, terminals or connectors
• Instrument panel dimmer switch
• SJB