Test F: The Courtesy Lamps Are Inoperative - From The Dimmer Switch

PINPOINT TEST F: THE COURTESY LAMPS ARE INOPERATIVE - FROM THE DIMMER SWITCH

Normal Operation
The smart junction box (SJB) monitors the instrument panel dimmer switch status on circuit CLN28 (GN/BU) to determine if the courtesy lamps are requested. When the instrument panel dimmer switch is rotated to the dome detent, ground is supplied to circuit CLN28 (GN/BU). Based on the dimmer switch status, the SJB supplies voltage to the courtesy lamps through circuit VLN33 (GY/VT).

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Instrument panel dimmer switch (part of the headlamp switch)
- SJB

F1-F3:

F3-F4: