GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Suspension Controls Schematics

1

Did you review the Air Suspension operation and perform the necessary inspections?

Go to Step 2

Go to Air Suspension Description and Operation

2

IMPORTANT: The vehicle must be on a drive on hoist.

  1. Raise and support the vehicle.
  2. Disconnect the Air Suspension Compressor Assembly.
  3. Connect a test lamp between the battery positive voltage circuit of the Air Suspension Compressor Assembly harness and ground.

Does the test lamp illuminate?

Go to Step 3

Go to Step 6

3

Connect a test lamp between the ground circuit of the Air Suspension Compressor Assembly harness and a battery positive voltage circuit.

Does the test lamp illuminate?

Go to Step 4

Go to Step 7

4

Disconnect both air spring supply tubes at the Air Suspension Compressor Assembly.

Did the vehicle lower?

Go to Step 5

Go to Step 8

5

Replace the Air Suspension Compressor Assembly.

Refer to Air Spring Compressor Replacement .

Did you complete the replacement?

Go to Step 10

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6

Repair open circuit on the Air Suspension Compressor Assembly battery positive circuit.

Did you complete the repair?

Go to Step 10

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7

Repair open circuit on the Air Suspension Compressor Assembly ground circuit.

Did you complete the repair?

Go to Step 10

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8

Carefully inspect air tube assemble for damage.

Was any damage found?

Go to Step 9

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9

Repair or replace any damaged componets.

Is the repair complete?

Go to Step 10

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10

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Diagnostic System Check - Air Suspension