Normal Operation

Based on input received from the instrument panel dimmer switch, the smart junction box (SJB) sends a pulse-width modulated (PWM) voltage to the hardwired dimmable illumination sources through circuit VLN04 (VT/GY).

• DTC B2A32 (LED Backlighting Output Circuit Open) - is an on-demand DTC that sets when the SJB detects an open on the LED backlighting output circuit.
• DTC B2A33 (LED Backlighting Output Circuit Short to Ground) - is a continuous and on-demand DTC that sets when the SJB detects a short to ground on the LED backlighting output circuit. This DTC also sets when fuse 10 (15A) has failed or is removed.

This pinpoint test is intended to diagnose the following:

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