Test F: The Instrument Panel Illumination Does Not Dim

PINPOINT TEST F: THE INSTRUMENT PANEL ILLUMINATION DOES NOT DIM

F1:

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

Possible Causes
- circuit 235 (RD/BK) short to voltage
- instrument panel dimmer switch