Test F: The Instrument Panel Illumination Does Not Dim

PINPOINT TEST F: THE INSTRUMENT PANEL ILLUMINATION DOES NOT DIM

Test F1:

Normal Operation
When the headlamp switch is placed in the PARK position or the headlamp ON position, voltage is supplied to the dimmer switch through circuit 14 (BN). The dimmer switch the then needs a variable voltage to the illumination controls through circuit 19 (LB/RD). Ground for the dimmer switch is supplied through circuit 57 (BK).

Possible Causes
- circuit 19 (LB/RD) short to voltage
- instrument panel dimmer switch