Normal Operation

The Smart Junction Box (SJB) sends a Pulse Width Modulated (PWM) voltage to the dimmable components through circuit VLN04 (VT/GY). Ground is provided through circuits GD112 (BK/GN), GD114 (BK/BU) and GD908 (BK).

• 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 fuse 10 (15A) has failed or is removed.

This pinpoint test is intended to diagnose the following: 

• Fuse
• Wiring, terminals or connectors
• SJB