Circuit Description
The automatic level control (ALC) suspension position sensor is a potentiometer. The RIM determines the height of the rear of the vehicle based on the voltage from the suspension 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 position sensor signal voltage is less that 0.3 Volts or greater than 4.8 Volts. |
| • | The above conditions are present for greater than 10 seconds. |
Action Taken When the DTC Sets
The automatic level control suspension will be inoperative.
Conditions for Clearing the DTC
The RIM does not detect a voltage above or below the predetermined value 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.
-
Tests for the proper operation of the circuit in the high range. If the fuse in the jumper opens when you perform the test, the signal circuit is shorted to ground.
-
Tests for a short to voltage in the 5 volts reference circuit.
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? | 0.5-4.5 V | Go to Diagnostic Aids | Go to Step 3 |
3 |
Does the voltage measure near the specified value? | 5 V | Go to Step 4 | Go to Step 6 |
Does the scan tool indicate that the suspension position sensor voltage is greater than the specified value? | 4.75 V | Go to Step 5 | Go to Step 7 | |
Does the voltage measure less than the specified value? | 4.75 V | Go to Step 8 | Go to Step 9 | |
6 | Test the suspension position sensor 5 volt reference circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 10 |
7 | Test the suspension position sensor signal circuit for a short to ground, high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 10 |
8 | Test the suspension position sensor low reference circuit for a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 10 |
9 | 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 13 | Go to Step 11 |
10 | 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 13 | Go to Step 12 |
11 | Replace the suspension position sensor. Refer to Automatic Level Control Sensor 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 |
