You need to jumper the A & C terminals with the key ON. The Service Ride Control light will flash code 12 three times, followed by any other trouble codes being flashed three times. My '90 just acted up, setting a code 33, indicating the left rear actuator motor had not found the limit stop during the self test. I pulled out the shock and found the nylon gear teeth on the actuator motor had disintegrated. Send me a note with your trouble codes if you don't have the factory manual, and I'll tell you what the code means.
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