For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 |

1. Disconnect the auto level control sensor.
2. Using a test light, probe between the auto level control sensor harness connector terminal C to ground.

Is the test light on?

--

Go to Step 3

Go to Step 2

2 |

1. Check CKT 1240 and CKT 1248 for a poor connection or open.
2. If OK, replace the auto level control air inflator relay. Refer to Automatic Level Control Relay Replacement .

Has repair been made and the system rechecked?

--

System OK

--

3 | Using a test light, probe between the auto level control sensor harness connector terminal A and terminal C. Is the test light on? | -- | Go to Step 5 | Go to Step 4
4 | Repair the poor connection or open in CKT 1725 between the auto level control sensor harness connector terminal A and G401. Has the repair been made and the system rechecked? | -- | System OK | --
5 |

1. Turn the ignition switch to RUN.
2. Using a test light, probe between the auto level control sensor harness connector terminal D to ground.

Is the test light on?

--

Go to Step 7

Go to Step 6

6 | Repair the poor connection or open in CKT 743 between the auto level control sensor harness connector terminal D and S465. Has the repair been made and the system rechecked? | -- | System OK | --
7 | Connect a 10 A fused jumper from the auto level control sensor harness connector terminal E to ground. Is the exhaust solenoid on and venting air? | -- | Go to Step 8 | Go to Step 9
8 | Replace the auto level control sensor. Refer to Automatic Level Control Sensor Replacement . Has the repair been made and the system rechecked? | -- | System OK | --
9 | Check to see if the fuse in the jumper wire is open. Is the fuse in the jumper open? | -- | Go to Step 10 | Go to Step 11
10 | Repair short to B+ on CKT 320. Has the repair been made and the system rechecked? | -- | System OK | --
11 |

1. Leave the 10 A fused jumper connected.
2. Disconnect the auto level control air compressor connector.
3. Using a test light, probe between the auto level control air compressor harness connector terminal B and terminal C.

Is the test light on?

--

Go to Step 12

Go to Step 13

12 | Replace the auto level control air compressor head. Refer to Automatic Level Control Air Compressor Head Replacement . Has the repair been made and the system rechecked? | - | System OK | --
13 | Check for a poor connection or open in CKT 320. Is there a poor connection or open in CKT 320? | -- | Go to Step 15 | Go to Step 14
14 | Repair the poor connection or open in CKT 1240 between the ELC/TRAILER fuse and the auto level control air compressor harness connector terminals C and E. Has the repair been made and the system rechecked? | -- | System OK | --
15 | Repair the poor connection or open in CKT 320. Has the repair been made and the system rechecked? | -- | System OK | --