N Unable To Detect Lowering of LF Corner

Unable to Detect Lowering of Left Front Corner

PINPOINT TEST N: UNABLE TO DETECT LOWERING OF LEFT FRONT CORNER:

PINPOINT TEST N: UNABLE TO DETECT LOWERING OF LEFT FRONT CORNER (Continued):

The Control Module has not received the signal that the left front corner of the vehicle vented during the Auto Test check. There are ten possible causes:
1. Air suspension height sensor linkage arm is not connected properly to vehicle and/or air suspension height sensor.
2. Air line for left front air spring may be plugged.
3. Left front solenoid valve may be inoperative.
4. Left front air spring Battery Positive Voltage (B+) power supply circuit may have an open in it.
5. Left front air spring ground return circuit may have an open in it.
6. Vent solenoid valve may be inoperative.
7. Vent solenoid B+ power supply circuit may have an open in it.
8. Vent solenoid ground return circuit may have an open in it.
9. Control Module may be inoperative.
10. Left front air spring may be unable to vent.