GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Suspension Controls Schematics

1

Did you perform the Air Suspension Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Air Suspension

2

Verify the fault is present.

Does the system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Remove the electronically controlled air suspension relay.

Does the compressor stop running?

Go to Step 4

Go to Step 6

4

Test the relay for continuity between pin 30 and pin 87.

Does the relay have continuity?

Go to Step 5

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5

Replace the relay.

Did you complete the replacement?

Go to Step 7

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6

Check for a short to battery on the compressor battery positive voltage circuit.

Did you find and correct the condition?

Go to Step 7

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7

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3