Circuit Description
The automatic level control (ALC) adjusts the vehicle suspension ride height. The RIM determines the height of the vehicle based on the voltage from the suspension position sensor. The RIM raises and lowers the rear of the vehicle in order to keep the vehicle level.
Conditions for Running the DTC
| • | The RIM is powered up. |
| • | DTC B1327 is not set. |
Conditions for Setting the DTC
The exhaust solenoid control is found to be open or shorted to ground for 10 seconds.
Action Taken When the DTC Sets
The automatic level control will be inoperative.
Conditions for Clearing the DTC
When the RIM does not detect a failure during the self test.
Diagnostic Aids
| • | Inspect for the addition of any aftermarket components. |
| • | Inspect all wiring carefully for chaffing and proper routing. Refer to Testing for Electrical Intermittents and Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
Listen for an audible click when the exhaust solenoid operates. Command both the ON and OFF states. Repeat the commands as necessary.
-
Tests if ground is constantly being applied to the solenoid.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Automatic Level Control Schematics | |||
1 | Did you perform A Diagnostic System Check - Automatic Level Control? | Go to Step 2 | |
Does the exhaust solenoid turn ON and OFF with each command? | Go to Diagnostic Aids | Go to Step 3 | |
3 |
Does the test lamp illuminate? | Go to Step 4 | Go to Step 10 |
4 |
Does the test lamp turn ON and OFF with each command? | Go to Step 8 | Go to Step 5 |
Does the test lamp remain illuminated with each command? | Go to Step 7 | Go to Step 6 | |
6 | Test the control circuit of the exhaust solenoid for an open. Refer to Connector Repairs and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 9 |
7 | Test the control circuit of the exhaust solenoid valve for a short to ground. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 9 |
8 | Inspect for poor connections at the exhaust solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 11 |
9 | Inspect for poor connections at the harness connector for the RIM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 12 |
10 | Repair the battery positive voltage circuit of the exhaust solenoid valve. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | -- |
11 | Replace the compressor head assembly. Refer to Automatic Level Control Air Compressor Head Replacement . Did you complete the replacement? | Go to Step 13 | -- |
12 |
Important: Perform the ALC relearn procedure. Replace the RIM. Refer to Rear Integration Body Control Module Replacement in Body Control System. Did you complete the replacement? | Go to Step 13 | -- |
13 |
Does the DTC reset? | Go to Step 2 | System OK |
