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REAR LEVELING DIAGNOSTIC PROCEDURES SELF-DIAGNOSTICS A self-diagnostic procedure is available for the ser- vice technician to use to detect system malfunctions. BEFORE DIAGNOSTICS TEST Check the 20 amp fuse (position W40) and the 30 amp circuit breaker (position W5) to be assured they Check all connectors that link the system into the main body wiring harness. These include compressor, TEST LAMP PIN OPERATION The monitor lamp pin output will be activated (test lamp on) if the detection of abnormal system opera- AFTER COMPLETION OF REPAIRS To initiate diagnostics, disconnect the test ground wire then reconnect for repair verification. TERMINATION OF SELF-DIAGNOSTICS The self-diagnostic operation is terminated when any of the following takes place: When the self-diagnostic operation is terminated. The control module resumes normal operation unless TEST WEIGHT Weight between 275-300 lbs. must be added to rear of vehicle before diagnostic testing begins. DIAGNOSTICS (TO START PROCESS) (1) Remove protective connector cover from diag- nostic connector. (2) Insert wire into diagnostic ground pin. Then at- tach to compressor ground pin, or as an alternate, in- IGNITION The following self diagnostic operation is initiated by connecting the diagnostic ground pin to ground af- OPERATION (1) The compressor relay output. From the control module (CM), is activated until the vehicle is in the 610 seconds. If the expected position is not obtained, the CM ceases self-diagnostics and any 61 minutes has elapsed after ignition was turned off. See Diagnostics Chart 1. (2) The monitor lamp output should flash to indi- cate the position of the height sensor. The sensor 610 seconds but the height sensor did not move to the high position within the right shock absorber). (3) Next the exhaust solenoid output is activated until the vehicle is in the low position. The maxi- 610 sec- onds. If the expected position is not obtained, the (4) The monitor lamp should flash to indicate the height sensor is in the low position. A continuously Fig. 7 Control Module Connector Fig. 8 Diagnostic Test Pin Location Ä SUSPENSION AND DRIVESHAFTS 2 - 65 |