Normal Operation
WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
In the ON position, a signal is sent from the Vehicle Dynamics Module (VDM) along circuit 417 (VT/OG) to the VDM along circuit 635 (YE) through the closed air suspension switch. The VDM receives this signal and activates the air suspension system. In the OFF position, this signal is interrupted by the open air suspension switch and the VDM deactivates the air suspension system.
- DTC C1840 Air Suspension Disable Switch Circuit Failure - If during the VDM on-demand self test, the air suspension switch is not in the ON position or the VDM detects an open, a short to voltage or a short to ground on the air suspension switch circuit, DTC C1840 will set.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Air suspension switch
- VDM