GM Service Manual Online
For 1990-2009 cars only

DTC B2860 Symptom 01

Circuit Description

The driver position module (DPM) determines the position of the steering column based on inputs received from a position sensor built into the telescoping actuator. The steering column module supplies a 5 volt reference and a ground to the sensor and monitors the column position via the telescope sensor signal circuit.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B2860 Telescope Position Sensor

This vehicle has DTCs which include DTC symptoms. For more information on DTC symptoms, refer to DTC Symptom Description .

DTC Symptom

DTC Symptom Descriptor

01

Short to Battery +

Conditions for Running the DTC

DTC B1327 is not set as current.

Conditions for Setting the DTC

This DTC will set as current when the voltage is greater than 4.8 volts for 2 seconds on the telescope sensor circuit.

Action Taken When the DTC Sets

The DPM will not allow the affected motor to work during memory recall and/or easy exit operations. However, the motor will still operate for manual switch positioning.

Conditions for Clearing the DTC

This DTC will clear from current status when the voltage is less than 4.8 volts for 2 seconds.

Diagnostic Aids

Inspect the steering column for abnormal looseness.

Step

Action

Value(s)

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

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

  1. Turn ON the ignition, with the engine OFF.
  2. In order to measure the voltage at the telescope sensor signal circuit, backprobe the circuit at the DPM connector using a DMM.

Is the voltage less than the specified parameter?

4.8 V

Go to Step 8

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the telescope actuator harness connector from the DPM.
  3. Connect a 3 amp fused jumper wire between the telescope sensor signal circuit and a good ground.
  4. Turn ON the ignition, with the engine OFF.
  5. With the scan tool, observe the Telescope Sensor data parameter.

Does the scan tool indicate the voltage is less than the specified value?

0.12 V

Go to Step 4

Go to Step 6

4

Inspect for poor connections at the harness connector of the telescope actuator. 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 7

Go to Step 5

5

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

Did you complete the replacement?

--

Go to Step 7

--

6

Important: Perform the set up procedure for the DPM.

Replace the DPM. Refer to Control Module References .

Did you complete the replacement?

--

Go to Step 7

--

7

Calibrate the tilt/telescoping steering column. Refer to Telescoping Steering Column Calibration .

Did you complete the action?

--

Go to Step 8

--

8

  1. Clear the DTCs with a scan tool.
  2. Operate the vehicle within the Conditions for Running the DTC, as specified in the supporting text.

Does DTC B2860 01 reset?

--

Go to Step 2

System OK

DTC B2860 Symptom 5A

Circuit Description

The driver position module (DPM) determines the position of the steering column based on an input received from a position sensor built into the telescope actuator. The DPM supplies a 5 volt reference and a ground to the sensor and monitors the column position via the telescope sensor signal circuit. The DPM expects the voltage on the telescope sensor signal circuit to be within a certain range of what the voltage was previously. If the voltage on the telescope sensor circuit changes by a large amount in a short time, DTC B2860 5A may set.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B2860 Telescope Position Sensor

This vehicle has DTCs which include DTC symptoms. For more information on DTC symptoms, refer to DTC Symptom Description .

DTC Symptom

DTC Symptom Descriptor

5A

Plausibility Failure

Conditions for Running the DTC

DTC B1327 is not set as current.

Conditions for Setting the DTC

This DTC will set as current if voltage on the telescope sensor signal circuit is outside of the expected range.

Action Taken When the DTC Sets

The steering column module will not allow the affected motor to work during memory recall and/or easy exit operations. However, the motor will still operate for manual switch positioning.

Conditions for Clearing the DTC

This DTC will clear from current status when the voltage on the telescope signal circuit remains within the expected range.

Step

Action

Value(s)

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 in Vehicle DTC Information

2

  1. Turn ON the ignition, with the engine OFF.
  2. Observe the Telescope Sensor parameter with a scan tool.
  3. Operate the telescoping column forward and rearward.

Does the Telescope Sensor voltage change up and down smoothly when the telescoping column is operated forward and rearward?

--

Go to Step 10

Go to Step 3

3

  1. backprobe the telescope sensor signal circuit using a DMM.
  2. Observe the telescope Sensor parameter with a scan tool.
  3. Operate the telescoping column forward and rearward.

Does the voltage on the telescope sensor signal circuit match the voltage displayed on the scan tool?

--

Go to Step 4

Go to Step 7

4

  1. backprobe the 5 volt refrence circuit and the low refrence circuit using a DMM.
  2. Operate the telescoping column forward and rearward.

Is the voltage between the 5 volt refrence circuit and the low refrence circuit equal to the specified value?

5 V

Go to Step 5

Go to Step 7

5

Test the telescope sensor signal circuit, the 5 volt refrence circuit, and the low refrence circuit for a high resistance or an intermittent open. Refer to Testing for Intermittent Conditions and Poor Connections .

Did you find and correct the condition?

--

Go to Step 11

Go to Step 6

6

Inspect for poor connections at the harness connector of the telescope actuator. 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 11

Go to Step 8

7

Inspect for poor connections at the harness connector of the DPM. 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 11

Go to Step 9

8

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

Did you complete the replacement?

--

Go to Step 10

--

9

Important:: Perform the set up procedure for the DPM.

Replace the DPM. Refer to Control Module References .

Did you complete the replacement?

--

Go to Step 10

--

10

Calibrate the steering column. Refer to Telescoping Steering Column Calibration .

Did you complete the action?

--

Go to Step 11

--

11

  1. Clear the DTCs with a scan tool.
  2. Operate the vehicle within the Conditions for Running the DTC, as specified in the supporting text.

Does DTC B2860 5A reset?

--

Go to Step 2

System OK

DTC B2860 Symptom 06

Circuit Description

The driver position module (DPM) determines the position of the steering column based on inputs received from a position sensor built into the telescope actuator. The DPM supplies a 5 volt reference and a ground to the sensor and monitors the column position via the telescope sensor signal circuit. If the telescope sensor signal circuit is shorted to ground or open, DTC B2860 06 will set.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B2860 Telescope Position Sensor

This vehicle has DTCs which include DTC symptoms. For more information on DTC symptoms, refer to DTC Symptom Description .

DTC Symptom

DTC Symptom Descriptor

06

Short to Ground or Open

Conditions for Running the DTC

DTC B1327 is not set as current.

Conditions for Setting the DTC

This DTC will set as current when the voltage is less than 1.2 volts for 2 seconds on the telescope sensor circuit.

Action Taken When the DTC Sets

The DPM will not allow the telescope motor to work during memory recall and/or easy exit operations. However, the motor will still operate for manual switch positioning.

Conditions for Clearing the DTC

This DTC will clear from current status when the voltage is greater than 1.2 volts for 2 seconds.

Step

Action

Value(s)

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

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. In order to measure the voltage at the telescope sensor signal circuit, backprobe the circuit at the DPM connector using a DMM.

Is the voltage greater than the specified value?

0.12 V

Go to Step 8

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the telescope actuator harness connector from the DPM.
  3. Connect a 3 amp fused jumper wire between the telescope sensor circuit of the DPM and the 5 volt reference circuit.
  4. Turn ON the ignition, with the engine OFF.
  5. Observe the Telescope Sensor voltage with a scan tool.

Is the voltage greater than the specified value?

4.8 V

Go to Step 4

Go to Step 6

4

Inspect for poor connections at the harness connector of the telescope motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

--

Go to Step 7

Go to Step 5

5

Replace the telescope motor. Refer to Tilt Motor Replacement .

Did you complete the replacement?

--

Go to Step 7

--

6

Important: Perform the set up procedure for the DPM.

Replace the DPM. Refer to Control Module References .

Did you complete the replacement?

--

Go to Step 7

--

7

Calibrate the tilt/telescoping steering column. Refer to Telescoping Steering Column Calibration .

Did you complete the action?

--

Go to Step 8

--

8

  1. Clear the DTCs with a scan tool.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does DTC B2860 06 reset?

--

Go to Step 2

System OK

DTC B2860 Symptom 61

Circuit Description

The driver position module (DPM) determines the position of the steering column based on inputs received from a position sensor built into the telescope actuator. The DPM supplies a 5 volt reference and a ground to the sensor and monitors the column position via the telescope sensor signal circuit.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B2860 Telescope Position Sensor

This vehicle has DTCs which include DTC symptoms. For more information on DTC symptoms, refer to DTC Symptom Description .

DTC Symptom

DTC Symptom Descriptor

61

Actuator Stuck

Conditions for Running the DTC

DTC B1327 is not set as current.

Conditions for Setting the DTC

This DTC will set as current when the telescope actuator is commanded to move and the voltage on the telescope signal circuit has not changed.

Action Taken When the DTC Sets

The DPM will not allow the telescope motor to work during memory recall and/or easy exit operations. However, the motor will still operate for manual switch positioning.

Conditions for Clearing the DTC

This DTC will clear from current status when the voltage on the telescope signal circuit changes.

Step

Action

Value(s)

Yes

No

Schematic Reference: Tilt/Telescoping Steering Column Schematics

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

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

Operate the steering column telescope switch.

Does the steering column telescope forward and rearward?

--

Go to Step 3

Go to Steering Column Tilt/Telescoping Inoperative or Steering Column Does Not Telescope In/Out

3

  1. Observe the Telescope Sensor parameter with a scan tool.
  2. Operate the telescoping column forward and rearward.

Does the Telescope Sensor voltage change up and down when the telescope wheel is operated forward and rearward?

--

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

Go to Step 4

4

  1. Backprobe the telescope sensor signal circuit at the DPM connector using a DMM.
  2. Observe the Telescope Sensor parameter with a scan tool.
  3. Operate the telescoping column forward and rearward.

Does the voltage on the telescope sensor signal circuit match the voltage displayed on the scan tool?

--

Go to Step 5

Go to Step 6

5

  1. Backprobe the 5 volt refrence circuit and the low refrence circuit using a DMM.
  2. Operate the telescoping column forward and rearward.

Is the voltage between the 5 volt refrence circuit and the low refrence circuit equal to the specified value?

5 V

Go to Step 6

Go to Step 8

6

Test the telescope sensor signal circuit, the 5 volt refrence circuit, and the low refrence circuit for a high resistance or an intermittent open. Refer to Testing for Intermittent Conditions and Poor Connections .

Did you find and correct the condition?

--

Go to Step 12

Go to Step 7

7

Inspect for poor connections at the harness connector of the telescope actuator. 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 12

Go to Step 9

8

Inspect for poor connections at the harness connector of the DPM. 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 12

Go to Step 10

9

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

Did you complete the replacement?

--

Go to Step 11

--

10

Important:: Perform the set up procedure for the DPM.

Replace the DPM. Refer to Control Module References .

Did you complete the replacement?

--

Go to Step 11

--

11

Calibrate the steering column. Refer to Telescoping Steering Column Calibration .

Did you complete the action?

--

Go to Step 12

--

12

  1. Clear the DTCs with a scan tool.
  2. Operate the vehicle within the Conditions for Running the DTC, as specified in the supporting text.

Does DTC B2860 61 reset?

--

Go to Step 2

System OK