B2510

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 instrument cluster determines which switch has been pressed by the voltage drop across the corresponding resistance value.

CONDITIONS FOR RUNNING THE DTC
This test is run every 300 milliseconds.

CONDITIONS FOR SETTING THE DTC
One of the HVAC switches must be active (stuck) for at least 30 seconds.

Action Taken When the DTC Sets
The instrument cluster will ignore the switch command.

CONDITIONS FOR CLEARING THE DTC
^ The DTC will become history if the instrument cluster no longer detects a failure.
^ The history DTC will clear after 50 fault free ignition cycles.
^ The DTC can be cleared with a scan tool.

DIAGNOSTIC AIDS
If the condition is not present, 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 one of the HVAC switches of the steering wheel controls is active. The value given is the normal condition that exists when no switch is activated.