Circuit Description
The automatic level control (ALC ) position sensor is a potentiometer. The RIM determines the height of the rear of the vehicle based on the voltage from the position sensor. The RIM raises or lowers the rear of the vehicle in order to keep the vehicle level.
Conditions for Running the DTC
The RIM is powered up and DTC B1327 is not set.
Conditions for Setting the DTC
The (ALC) suspension position sensor reference or signal circuit is found to be shorted to battery voltage for more than 10 seconds.
Action Taken When the DTC Sets
The automatic leveling control will be disabled.
Conditions for Clearing the DTC
When the RIM does not detect voltage out of the specified range in the signal or reference circuit during the diagnostic 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 Intermittent Conditions and Poor Connections and Testing for Electrical Intermittents in Wiring Systems. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Automatic Level Control Schematics | ||||
1 | Did you perform A Diagnostic System Check - Automatic Level Control? | -- | Go to Step 2 | |
2 |
Does the scan tool indicate the voltage is within the specified range? | 0.25-4.75 V | Go to Diagnostic Aids | Go to Step 3 |
3 |
Does the scan tool indicate that the voltage parameter is greater than the specified value? | 0 V | Go to Step 4 | Go to Step 10 |
4 | Measure the voltage of the suspension position sensor signal circuit to ground. Does the voltage measure greater than the specified value? | 5 V | Go to Step 6 | Go to Step 5 |
5 | Measure the voltage of the suspension position sensor 5-volt reference circuit to ground. Does the voltage measure greater than the specified value? | 5 V | Go to Step 7 | Go to Step 8 |
6 | Test the suspension position sensor signal 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 14 | Go to Step 11 |
7 | Test the suspension position sensor 5 volt reference 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 14 | Go to Step 11 |
Measure the resistance of the suspension position sensor low reference circuit to a good ground. Is the resistance greater than the specified value? | 5 ohms | Go to Step 9 | Go to Step 10 | |
9 | Repair the high resistance or open circuit on the suspension position sensor low reference circuit. Did you find and correct the condition? | -- | Go to Step 14 | -- |
10 | Inspect for poor connections at the harness connector of the suspension position sensor. 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 14 | Go to Step 12 |
11 | Inspect for poor connections at the harness connector of 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 14 | Go to Step 13 |
12 |
Important: Perform the ALC relearn procedure. Replace the suspension position sensor. Refer to Automatic Level Control Sensor Replacement . Did you complete the replacement? | -- | Go to Step 14 | -- |
13 |
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 14 | -- |
14 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
