Test A: The Control Illumination Is Inoperative

PINPOINT TEST A: THE CONTROL ILLUMINATION IS INOPERATIVE

A1-A2:

A2-A3:

Normal Operation
When the headlamp switch is in the PARKING LAMPS or HEADLAMPS ON position, ground is supplied to the parking lamp relay coil through the smart junction box (SJB). The parking lamp relay provides switched voltage to the instrument panel dimmer switch on circuit CBP01 (BU) from the smart junction box (SJB). The instrument panel dimmer switch provides a variable voltage to the instrument cluster and panel switches on circuit VLN18 (BU/WH).

Possible Causes
- Fuse(s)
- Circuit CBP01 (BU) open
- Circuit VLN18 (BU/WH) open or short to ground
- Instrument panel dimmer switch