Service Air Suspension Message Diagnostic Trouble Code (DTC) C0711 and/or Clicking Noise From Rear of Vehicle with Ignition Off and/or Electronic Controlled Air Suspension (ECAS) Compressor Cycles Too

Some customers may comment on a Service Air Suspension message and/or a clicking noise from the rear of the vehicle when the vehicle is shut off and the key is removed from the ignition and/or the ECAS compressor cycles too frequently while the vehicle is running.

ECAS control module calibration issues.

For diagnosis and repair of the ECAS, follow the service procedure below.

1. For diagnosis of Service Air Suspension DTC C0711, refer to DTC C0711 (SI Document ID #857738).

Important: 

•	Before reprogramming an Electronic Control Module (ECU), refer to Adm Msg - Important Programming/TIS Information for Technicians (Admin Number 20020120 - 9/10/02) #VSS20020120 (SI Document ID #976439).

•	When replacing the ECAS control module, the new module MUST BE reprogrammed.

2. Reprogram the ECAS control module with Tech Line Broadcast 11.75 sent to Dealers on 11/16/02 or newer. Refer to the Service Programming System (SPS) Remote Procedure (SI Document ID #820913) or the Service Programming System (SPS) Pass-Thru Procedure (SI Document ID #820915).

For vehicles repaired under warranty, use: