For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Suspension Controls Schematics
1 | Did you review the air suspension description and operation and perform the necessary electrical and mechanical inspections? | Go to Step 2 | Go to Air Suspension Description and Operation
2 | Verify the fault is present. Does the system operate normally? | Go to Testing for Electrical Intermittents in Wiring Systems | Go to Step 3
3 |

1. Disconnect the air suspension relief valve.
2. Ensure the air suspension dump switch is in the OFF position.
3. Connect a test lamp between the control circuit of the air suspension relief valve and the ground circuit of the air suspension relief valve. Refer to Circuit Testing in Wiring Systems.
4. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 4

Go to Step 6

4 |

1. Turn OFF the ignition.
2. Disconnect the air suspension dump switch.
3. Connect a test lamp between the control circuit of the air suspension relief valve and the ground circuit of the air suspension relief valve. Refer to Circuit Testing in Wiring Systems.
4. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 5

Go to Step 7

5 | Test the air suspension relief valve control circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 8 | --
6 | Replace the air suspension relief valve. Refer to Air Suspension Relief Valve Replacement . Did you complete the replacement? | Go to Step 8 | --
7 | Replace the air suspension dump switch. Did you complete the replacement? | Go to Step 8 | --
8 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3