GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2001 🢒 Seville 🢒 Suspension 🢒 Road Sensing Suspension (RSS) 🢒 DTC C0690, C0691, or C0693

Circuit Description

Battery voltage for the Continuously Variable Road Sensing Suspension (CVRSS) strut actuators is supplied to the CVRSS module through the damper drive relay circuit. The CVRSS module energizes the damper relay by opening and closing an internal ground for the damping relay coil control circuit. The CVRSS module monitors the damper drive relay circuit and each strut actuator high-side and low-side drive circuits for fault conditions.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

DTC C0690

The following conditions must be present to set the DTC:

    • The CVRSS module detects voltage less than a preset value in the damper drive relay circuit during a damper relay valve OFF state test.
    • The fault is detected during three consecutive ignition cycles, or during the same ignition cycle after clearing the DTC with a scan tool.

DTC C0691

The following conditions must be present to set the DTC:

    • The CVRSS module detects a loss of voltage in the damper drive relay circuit.
    • The fault is detected during three consecutive ignition cycles, or during the same ignition cycle after clearing the DTC with a scan tool.

DTC C0693

The following conditions must be present to set the DTC:

    • The CVRSS module detects voltage greater than a preset value in the damper drive relay circuit during a damper relay ON state test.
    • The fault is detected during three consecutive ignition cycles, or during the same ignition cycle after clearing the DTC with a scan tool.

Action Taken When the DTC Sets
    • ALL the strut actuators may be disabled by commanding 0% PWM duty cycle.
    • The vehicle ride will be soft.
    • The vehicle speed will be limited.
    • The SERVICE SUSPENSION SYS and SPEED LIMITED TO XXX messages will be displayed.

Conditions for Clearing the MIL/DTC
    • The scan tool can be used to clear the DTC.
    • The DTC is saved as history when the CVRSS module no longer sees an out of range feedback voltage in the damper drive relay circuit. The DTC will clear if the fault does not return after 50 consecutive ignition cycles.

Diagnostic Aids

Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. Listen for an audible click when the damper relay operates. Command both the ON and OFF states. Repeat the commands as necessary.

  2. Tests for voltage at the coil side of the damper relay . The CVRTD fuse supplies power to the coil side of the damper relay.

    3.

  3. Verifies that the CVRSS module is providing ground to the damper relay.

    4.

  4. Tests if ground is constantly being applied to the damper relay.

Step

Action

Yes

No

Schematic Reference: Suspension Controls Schematics

1

Did you perform the Road Sensing Suspension Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Road Sensing Suspension

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the damper relay ON and OFF.

Does the damper relay turn ON and OFF with each command?

Go to Diagnostic Aids

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the damper relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the coil side feed circuit of the damper relay with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 10

4

  1. Connect a test lamp between the damping relay coil control circuit of the damper relay and the coil side feed circuit of the damper relay.
  2. With a scan tool, command the damper relay ON and OFF .

Does the test lamp turn ON and OFF with each command?

Go to Step 8

Go to Step 5

5

Does the test lamp remain illuminated with each command?

Go to Step 7

Go to Step 6

6

Test the damper drive relay circuit of the damper relay for a short to voltage 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 9

7

Test the damper drive relay circuit of the damper relay for a short to ground. Refer to Circuit Testing 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 damper relay. 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 of the CVRSS module. 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 coil side feed circuit of the damper relay. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 13

--

11

Replace the damper relay.

Did you complete the replacement?

Go to Step 13

--

12

Important: Perform the set up procedure for the CVRSS module.

Replace the CVRSS module. Refer to Electronic Suspension Control Module Replacement .

Did you complete the replacement?

Go to Step 13

--

13
  1. Use the scan tool in order to clear the DTCs .
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK