GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Suspension Controls Schematics

1

Did you review the system and circuit description and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Selectable Ride

2

Verify the fault is present.

Does the system operate normally?

Go to Testing for Electrical Intermittents in Wiring Systems

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the selectable ride switch. Refer to Electronic Suspension Switch Replacement .
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between the ignition 1 voltage circuit and a good ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

Go to Step 4

Go to Step 8

4

Connect a test lamp between the selectable ride switch control circuit and a good ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

Go to Step 9

Go to Step 5

5

  1. Turn OFF the ignition.
  2. Reconnect the selectable ride switch.
  3. Connect a test lamp (back probe), between the selectable ride switch control circuit and a good ground. Refer to Circuit Testing in Wiring Systems.
  4. Turn ON the ignition, with the engine OFF.
  5. While back probing, turn the selectable ride switch from ON to OFF (FIRM and NORM).

Does the test lamp illuminate in the ON position and off in the OFF position?

Go to Step 6

Go to Step 12

6

  1. Ensure the selectable ride switch is in the ON (FIRM) position and the ignition is in the ON position.
  2. Gain access to connector C3 at the Engine Wiring Harness Junction Block.
  3. Connect a test lamp (back probe), between the selective ride switch control circuit and a good ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

Go to Step 7

Go to Step 10

7

  1. Inspect the electrical connections at each shock.
  2. Inspect the ground for both the front and the rear shocks to be clean and tight.
  3. Ensure that all the connections are clean and tight and free of corrosion.

Did you find the condition?

Go to Step 11

Go to One Shock Does Not Operate

8

Test the ignition 1 voltage circuit for an open or 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

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9

Repair the short to voltage in the selectable ride switch control circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 13

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10

Repair the open in the selectable ride switch control circuit between the switch and the Engine Wiring Harness Junction Block. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 13

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11

Repair the conditions as necessary. Refer to the appropriate procedure in Wiring Systems from the following list:

    •  Wiring Repairs
    •  Connector Repairs

Did you complete the repair?

Go to Step 13

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12

Replace the selectable ride switch. Refer to Electronic Suspension Switch Replacement .

Did you complete the replacement?

Go to Step 13

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13

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3