Schematic Reference: Suspension Controls 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

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 4

Go to Step 7

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 5

Go to Step 8

Disconnect both air spring supply tubes at the air suspension compressor assembly.

Did the vehicle lower?

Go to Step 6

Go to Step 9

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

Did you complete the replacement?

Go to Step 11

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Repair open circuit on the air suspension compressor assembly battery positive circuit.

Did you complete the repair?

Go to Step 11

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

Did you complete the repair?

Go to Step 11

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Carefully inspect air tube assemble for damage.

Was any damage found?

Go to Step 10

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Repair or replace any damaged components.

Is the repair complete?

Go to Step 11

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 1