GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The steering wheel controls are simple momentary contact switches that connect a series of resistors so that each switch selection corresponds to a fixed resistance value. The dash integration module (DIM) determines which switch has been pressed by the voltage drop across the corresponding resistance value.

DTC Descriptor

This diagnostic procedure supports the following DTC:

B2810 Steering Wheel Controls Entertainment Circuit

Conditions for Running the DTC

This test is run every 300 milliseconds.

Conditions for Setting the DTC

The switch must be stuck, pressed, for at least 30 seconds.

Action Taken When the DTC Sets

The DIM will ignore the switch command.

Conditions for Clearing the MIL/DTC

The stuck switch condition must be corrected.

Diagnostic Aids

    • The following may cause an intermittent:
       - A bent terminal
       - A backed out terminal
       - A damaged terminal
       - Poor terminal tension
       - A chafed wire
       - A broken wire inside the insulation
    • When diagnosing for an intermittent short or an open, massage the wire harness while watching the test equipment for changes.

Test Description

The number below refers to the step number on the diagnostic table.

  1. This step verifies that the steering wheel convenience switch is stuck. The convenience switches operate in the 123-247 count range. The value given is the normal condition that exists when no switch is activated.

Step

Action

Value(s)

Yes

No

Schematic Reference: Steering Wheel Controls Schematics

Connector End Views Reference: Entertainment Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

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Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Steering Wheel Controls parameter in the Dash Integration Module data list.

Does the Steering Wheel Controls parameter indicate the specified range?

0-7 Counts

Go to Diagnostic Aids

Go to Step 3

3

Replace the steering wheel control switch. Refer to Steering Wheel Control Switch Assembly Replacement in Steering Wheel and Column.

Did you complete the replacement?

--

Go to Step 4

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4

  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