GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2006 🢒 Corvette 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 DTC B2853, B2858, B2873, or B2878

Circuit Description

The driver position module receives ground inputs from contacts inside the telescoping switch. The steering column module then supplies battery voltage to the telescope motor in or out circuit depending on which direction of movement is requested.

DTC Descriptors

This diagnostic supports the following DTCs:

    • DTC 2853 Telescope Forward Switch Circuit Malfunction
    • DTC 2858 Telescope Rearward Switch Circuit Malfunction

Conditions for Running the DTC

The steering column module is ON.

Conditions for Setting the DTC

The steering column module detects a switch input for more than 30 consecutive seconds after movement of the motor in the requested direction has stopped.

Action Taken When the DTC Sets
    • The motor that is being driven by the failed switch will be deactivated.
    • Memory recall functions will be disabled.

Conditions for Clearing the DTC
    • A current DTC will clear when the failed switch input is no longer active.
    • A history DTC will clear after 100 ignition cycles.

Diagnostic Aids

An intermittently stuck switch can cause this DTC to set. Refer to Testing for Intermittent Conditions and Poor Connections .

Step

Action

Yes

No

Schematic Reference: Tilt/Telescoping Steering Column Schematics

Connector End View Reference: Steering Wheel and Column Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Turn ON the ignition, with the engine OFF.
  2. Retrieve DTCs with a scan tool.

Is DTC B2853 or B2858 displayed as Last Test: Failed?

Go to Step 3

Go to Diagnostic Aids

3
  1. Turn OFF the ignition.
  2. Disconnect the telescoping switch harness connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Retrieve DTCs with the scan tool.

Is DTC B2853 or B2858 displayed as Last Test: Failed?

Go to Step 4

Go to Step 5

4

Test the telescope forward and reverse switch signal circuits for a short to voltage. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 7

Go to Step 6

5

Replace the telescoping steering column switch. Refer to Telescope Actuator Switch Replacement .

Did you complete the replacement?

Go to Step 7

--

6

Replace the driver position module. Refer to Memory Seat Control Module Replacement .

Did you complete the replacement?

Go to Step 7

--

7
  1. Clear the DTCs with the scan tool.
  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