First indication is the "Service Ride Control" message on the Driver Information Center. You can get the trouble codes by jumpering the "A" & "C" terminals on the ALDL, which causes the above light to flash the code. In my case, it indicated the left rear shock motor was not working. When I removed the actuator motor from the shock, I found the nylon gears on the actuator motor had disintegrated. There is a noticable difference in the ride modes, but if your "Service Ride Control " light is not illuminated, then your system should be working fine. The system does a self-test every time you turn on the ignition key. Unless you have an obvious mechanical problem with a shock, such as a persistent leak, you should be fine.
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