B1820

CIRCUIT DESCRIPTION
The seat adjuster switch is supplied a 12-volt reference circuit by the driver seat module. When a seat adjuster switch is pressed the signal circuit is closed to the 12-volt reference circuit. Closing the signal circuit to the 12-volt reference circuit pulls the signal circuit high indicating to the driver seat module the switch status is active.

CONDITIONS FOR RUNNING THE DTC
The system voltage must be between 9.0 and 16.0 volts.

CONDITIONS FOR SETTING THE DTC
A seat adjuster switch input to the driver seat module is active for more than 60 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The driver seat module will ignore the switch input for which a current status DTC is set.
- When the fault is no longer present a history status DTC will be stored, and switch operation will be restored.

CONDITIONS FOR CLEARING THE DTC
- The DTC will be current for as long as the fault is present.
- When the fault is no longer present the DTC will be a history status code.
- The history DTC will be cleared after 100 error free ignition cycles, or by using the scan tool clearing DTCs feature.

TEST DESCRIPTION

Steps 1-3:

Steps 4-9:

The numbers below refer to the step numbers on the diagnostic table.
2. Verify that the DTC is current or history by monitoring the switch status for which the code is set.
3. Tests the seat adjuster switch for an internal fault.