GM Service Manual Online
For 1990-2009 cars only

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

  1. The presence of DTCs

  2. The symptom list in Symptoms will determine the correct diagnostic procedure to use.

Step

Action

Yes

No

Schematic Reference: Suspension Controls Schematics

1

Turn ON the ignition, with the engine OFF.

Does the LED in the inflator switch flash?

Go to Step 4

Go to Step 2

2

Press and release the inflator ON/OFF switch.

Does the LED in the Switch illuminate and the compressor start to run?

Go to Step 3

Go to Inflator Inoperative

3

Press and release the inflator ON/OFF switch.

Does the LED in the switch flash?

Go to Step 4

System OK

4

Does the LED in the switch flash DTC 1?

Go to DTC 001

Go to Step 5

5

Does the LED in the switch flash DTC 2?

Go to DTC 002

Go to Step 6

6

Does the LED in the switch flash DTC 3?

Go to DTC 003

Go to Symptoms - Air Suspension