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 dimmable components through circuit VLN04 (VT/GY).

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

This pinpoint test is intended to diagnose the following: 

• Fuse
• Wiring, terminals or connectors
• SJB