Test B: The Instrument Cluster Illumination Is Inoperative

PINPOINT TEST B: THE INSTRUMENT CLUSTER ILLUMINATION IS INOPERATIVE

B1:

B1-B3:

Normal Operation
When the headlamp switch is placed in the ON position, voltage is supplied to the instrument panel dimmer switch through circuit 14 (BN). The instrument panel dimmer switch then sends a variable voltage to the instrument cluster and the backlighting lamps through circuit 235 (RD/BK). The ground signal is supplied to the instrument panel dimmer switch through circuit 1205 (BK).

Possible Causes
- circuit 235 (RD/BK) open
- circuit 1205 (BK) open
- instrument cluster