Test A

PINPOINT TEST A: THE CONTROL ILLUMINATION IS INOPERATIVE

Test A1:

Test A1-A4:

Normal Operation
When the headlamp switch is placed in the ON position, battery power is supplied to the instrument panel dimmer switch through circuit 14 (BN). The instrument panel dimmer switch then sends a variable voltage to 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 14 (BN) open
- circuit 235 (RD/BK) open
- circuit 1205 (BK) open
- headlamp switch
- instrument panel dimmer switch