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

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

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) (Navigator only) and/or circuit VLN18 (BU/WH) (Expedition) (Navigator auxiliary climate control assembly).







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

A1-A3:

A3-A4:

A4-A6:

A6-A7: