Schematic Reference: Air Suspension Schematics

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

Did you review the Diagnostic Trouble Code Displaying first?

Go to Step 3

Go to Diagnostic Trouble Code (DTC) Displaying

1. Turn OFF the ignition.
2. Disconnect the air suspension compressor assembly.
3. Turn ON the ignition, with the engine OFF.
4. Connect a test lamp between the ground circuit of the air suspension compressor assembly and a battery positive voltage circuit.

Does the test lamp illuminate?

Go to Step 4

Go to Step 7

Test the battery positive voltage circuit of the air suspension compressor assembly for an open, short to ground and high resistance. Refer to the following:

Did you find and correct the condition?

Go to Step 9

Go to Step 5

Test the ignition 3 voltage circuit of the air suspension compressor assembly for an open, short to ground and high resistance. Refer to the following:

Did you find and correct the condition?

Go to Step 9

Go to Step 6

Inspect for poor connections at the harness connector of the air suspension compressor assembly.

Did you find and correct the condition?

Go to Step 9

Go to Step 8

Repair the open in the air suspension compressor assembly ground circuit.

Did you complete the repair?

Go to Step 9

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Replace the air suspension compressor assembly. Refer to Automatic Level Control Air Compressor Replacement .

Did you complete the replacement?

Go to Step 9

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 1