S037

TEST CONDITIONS:

The RSS module monitors the exhaust solenoid circuit during commanded on states. The module expects to see the circuit low.

FAULT CONDITIONS:

If the RSS module sees the circuit high during appropriate decoding times, a code is set.

ACTION TAKEN:

Set code, turn on "SERVICE RIDE CONTROL" message, and continue to drive the solenoid.

DESCRIPTION:

Leveling errors are detected via a single error feedback signal from a four channel integrated circuit Quad Driver Module (QDM) which drives both the compressor relay and the exhaust solenoid. The RSS module monitors this discrete feedback through all four possible leveling states (Compressor = Off Exhaust = Off, Compressor = Off Exhaust = On, Compressor = On Exhaust = Off, Compressor = On Exhaust = On) and decodes it only once all four states have been seen. All four states occur slightly after every ignition on when the leveling system goes through an Air Replenishment Cycle, as well as during normal operation. Only electrical problems with the compressor relay will be flagged. Compressor motor problems and pneumatic leakage problems will not set a code but the RSS module will shut the compress function off if no progress is made or if excessive run time occurs.

NOTES ON FAULT TREE:

1. Refer to notes on intermittents. To diagnose this condition:

^ Enter output cycling

^ Manipulate affected wiring

^ Recheck for codes.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETE, CLEAR CODES AND VERIFY OPERATION.