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Symptom Chart

WARNING: This page is about a different variant/trim than selected.
SYMPTOM CHART

Condition Possible Sources Action
No communication with the 4WAS module (VDM)
  • CJB fuses 20 (30A), 27 (5A), 102 (30A).
  • Circuitry.
  • 4WAS module (VDM).
 Go To PINPOINT TEST A .
NOTE: Be sure that the ignition switch is in the ON position and the air suspension service switch is in the ON position before determining that the 4WAS module will not enter the self-test.
Unable to enter self-test
  • Air suspension service switch.
  • 4WAS module.
 Go To PINPOINT TEST B .
Vehicle raises and/or lowers too slowly
  • Front/rear pneumatic failure.
  • Height sensor.
  • Air compressor assembly.
  • Circuitry.
  • Solenoid.
  • Air line.
 Go To PINPOINT TEST E .
Uneven vehicle height
  • Front/rear pneumatic failure.
  • Height sensor.
  • Solenoid.
  • Air compressor assembly.
  • Air line.
  • Circuitry.
 Go To PINPOINT TEST E .
The air compressor continuously cycles with the ignition switch in the OFF position and no DTC is set
  • Circuitry.
  • Air suspension relay.
  • 4WAS module.
 Go To PINPOINT TEST K .
The air suspension system is inoperative without DTCs and vehicle at rest
  • UBP network communication fault.
 Go To PINPOINT TEST L .
Air suspension system operates with air suspension service switch in the OFF position
  • Circuitry.
  • Air suspension switch.
  • 4WAS module.
 Go To PINPOINT TEST M .
Excessive air compressor noise
  • Silencer.
  • Mounting bracket.
  • Air compressor assembly.
  • Air compressor assembly in contact with other components.
 Go To PINPOINT TEST N .
The compressor is inoperative
  • CJB fuse 111 (50A).
  • Air compressor assembly.
  • Circuitry.
  • Air suspension (electromechanical or solid state) relay.
 Go To PINPOINT TEST O .
DTC B1566: Door circuit failure
  • Door(s) or liftgate open during on demand self-test.
 Validate that all doors, liftgate, and liftgate glass are closed. Check the door ajar indicator in the cluster.
If the door ajar indicator is illuminated, REFER to MULTIFUNCTION ELECTRONIC MODULE .
NOTE: Vehicle speed signal is sent through the UBP communication (secondary) network and it is transmitted by hardwire (primary).
DTC C1445: Vehicle Speed Signal Circuit Failure
  • Circuitry.
  • PCM.
  • UBP communication network.
 REFER to MODULE COMMUNICATIONS NETWORK .
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