Test A: The Control Illumination Is Inoperative - All Hardwired Illumination

PINPOINT TEST A: THE CONTROL ILLUMINATION IS INOPERATIVE - ALL HARDWIRED ILLUMINATION

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 GD111 (BK/BU), GD133 (BK), and GD147 (BK/VT).

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. 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

A1-A3:

A4: