Test K: DTC C1840 - Air Suspension Switch Circuit Failure

Pinpoint Test K: DTC C1840 - Air Suspension Switch Circuit Failure

Normal Operation
In the ON position, a signal is sent from circuit 417 (VT/OG) to circuit 635 (YE) through the closed air suspension switch. The air suspension module receives this signal and deactivates the air suspension system. In the OFF position, this signal is interrupted by the open air suspension switch and the air suspension module activates the air suspension system.

Possible Causes
^ Circuit open
^ Circuit shorted
^ Air suspension switch
^ Air suspension module

K1-K4: