GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The automatic level control (ALC) module provides 5 volts to the position sensor. The ALC sensor also monitors this voltage supply for a fault condition which prevents proper regulation. The control module is internal to the ALC sensor. No external circuits are involved.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C0696 Position Sensor Overcurrent (5 volt supply)

This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description .

DTC Symptom

DTC Symptom Descriptor

00

No additional information

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

    • The position sensor supply voltage is outside the valid range of 4.75-5.25 volts.
    • The fault is detected for 1 second or more during ignition cycles, or during the same ignition cycle after clearing the DTC with a scan tool.

Action Taken When the DTC Sets

    • The ALC sensor will set a current DTC
    • The SERVICE SUSPENSION SYS messages will be displayed
    • The ALC system will not operate

Conditions for Clearing the MIL/DTC

    • The scan tool can be used to clear the DTC.
    • The DTC is saved as history when the ALC sensor no longer sees a position sensor supply voltage outside the valid range of 4.75-5.25 volts. The DTC will clear if the fault does not return after 50 consecutive ignition cycles.

Diagnostic Aids

    • The control module is internal to the ALC sensor, and no external circuits are involved. If DTC C0696 sets, and cannot be cleared, replace the ALC sensor. Refer to Automatic Level Control Sensor Replacement
    • If DTC C0696 is stored in history, refer to Testing for Intermittent Conditions and Poor Connections .

Step

Action

Values

Yes

No

Schematic Reference: Automatic Level Control Schematics

1

Did you perform the Diagnostic System Check - Vehicle?

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Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Turn ON the ignition, with the engine OFF.
  2. With a scan tool, observe the Suspension Position Sensor Signal parameter in the data list for the ALC control module.

Is the Suspension Position Sensor Signal parameter within the specified range?

0.3-4.7 V

Go to Diagnostic Aids

Go to Step 3

3

Inspect for poor connections at the harness connector of the ALC sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 5

Go to Step 4

4

Replace the ALC sensor. Refer to Automatic Level Control Sensor Replacement .

Did you complete the replacement?

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Go to Step 5

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5

  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC.

Does DTC C0696 reset?

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Go to Step 2

System OK