B2805

Schematic:

CIRCUIT DESCRIPTION
The steering wheel controls are simple momentary contact switches that connect a series of resistors so that each switch selection corresponds to a fixed resistance value. The DIM determines which switch has been pressed by the voltage drop across the corresponding resistance value.

CONDITIONS FOR RUNNING THE DTC
The DIM must be powered.

CONDITIONS FOR SETTING THE DTC
The switch must be stuck (pressed) for at least 30 seconds.

ACTION TAKEN WHEN THE DTC SETS
The DIM will ignore the switch command.

CONDITIONS FOR CLEARING THE MIL/DTC
The stuck switch condition must be corrected.

DIAGNOSTIC AIDS
Refer to Testing for Intermittent and Poor Connections in Diagrams.

TEST DESCRIPTION

Steps 1-4:

The numbers below refer to the step numbers on the diagnostic table
2. This step verifies that the steering wheel HVAC switch is stuck. The HVAC switches operate in the 8-122 count range. The value given is the normal condition that exists when no switch is activated.