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

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

A1-A3:

A3-A4:

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 VLN37 (BU/WH) (MKX only) or circuit VLN04 (VT/GY) (Edge).

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. This DTC also sets when fuse 10 (15A) has failed or is removed.

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.

DTC B29B7 White Lighting Output Circuit Open - is an on-demand DTC that sets when the SJB detects an open on the white lighting output circuit. This DTC also sets when fuse 10 (15A) has failed or is removed.

DTC B29B8 White Lighting Output Circuit Short to Ground - is a continuous and on-demand DTC that sets when the SJB detects a short to ground on the white lighting output circuit.

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- SJB