GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Tilt/Telescoping Steering Column Schematics

Connector End View References: Steering Wheel and Column Connector End Views , Power Seat Connector End Views

DEFINITION: The telescope function is inoperative but the tilt function operates.

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Verify that the telescoping function is inoperative.

Does the telescoping function operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

  1. Turn ON the ignition, with the engine OFF.
  2. Observe the Telescope Forward Switch and the Telescope Rearward Switch parameters in the IPC Module Data Display list with a scan tool.

Does the scan tool indicate either switch is Active?

Go to Step 6

Go to Step 4

4

Observe the Telescope Forward Switch and the Telescope Rearward Switch parameters while pressing the tilt/telescoping switch to the Forward and Rearward positions.

Did both parameters change states as expected?

Go to Step 5

Go to Step 7

5

Observe the Telescope Forward Command and the Telescope Rearward Command parameters in the Memory Seat Module data list while pressing the tilt/telescoping switch to the In and Out positions.

Did both parameters change states as expected?

Go to Step 8

Go to Step 9

6

  1. Turn OFF the ignition.
  2. Disconnect the steering column tilt/telescope switch harness connector.

Does the scan tool indicate the Telescope Forward Switch and the Telescope Rearward Switch parameters are both Inactive?

Go to Step 10

Go to Step 7

7

Test the telescoping steering column switch In and Out signal circuits for an open or short to voltage. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 18

Go to Step 17

8

Test the steering column telescope motor control - forward circuit and the steering column telescope motor control - reverse circuit for a short to voltage or an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 18

Go to Step 11

9

Test the telescope actuator position sensor signal, 5-volt reference, and ground circuits for an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 18

Go to Step 12

10

Inspect for poor connections at the harness connector of the tilt/telescoping steering column switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 18

Go to Step 14

11

Inspect for poor connections at the harness connector of the tilt/telescoping steering column telescope actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 18

Go to Step 13

12

Inspect for poor connections at the harness connector of the memory seat module (MSM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 18

Go to Step 16

13

  1. Loosen the fasteners of the telescope actuator assembly. Refer to Telescope Actuator Assembly Replacement .
  2. Attempt to operate the telescoping column.
  3. Tighten the fasteners of the telescope actuator assembly 5 N·m (44 lb-in).
  4. Attempt to operate the telescoping column.

Did you correct the condition?

Go to Step 18

Go to Step 15

14

Replace the tilt/telescope switch.

Did you complete the replacement?

Go to Step 18

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15

Replace the telescope actuator. Refer to Telescope Actuator Assembly Replacement .

Did you complete the replacement?

Go to Step 17

--

16

Important: Perform the set up procedure for the MSM.

Replace the MSM. Refer to Control Module References .

Did you complete the replacement?

Go to Step 18

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17

Replace the IPM. Refer to Control Module References in Computer/Integrating Systems.

Did you complete the replacement?

Go to Step 18

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18

Perform the steering column calibration. Refer to Telescoping Steering Column Calibration .

Did you complete the action?

Go to Step 19

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19

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2