HD1 Star Code 78 Unable to Detect Lowering of Left Rear Corner

^ The air suspension control module has not received the signal that the left rear corner of the vehicle vented during the Service Bay Diagnostics check. There are ten possible causes:

^ Height sensor linkage arm is not connected properly to vehicle and/or height sensor.

^ Air line for left rear air spring may be plugged.

^ Left rear air spring solenoid valve may be inoperative.

^ Left air spring B+ power supply circuit may have an open in it.

^ Left rear air spring ground return circuit may have an open in it.

^ Vent solenoid valve may be inoperative.

^ Vent solenoid B+ power supply circuit may have an open in it.

^ Vent solenoid ground return circuit may have an open in it.

^ Air suspension control module may be inoperative.

^ Right rear air spring may be unable to vent.

GO to HD2.