GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2004 🢒 XLR 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 DTC B2860

Circuit Description

The driver position module (DPM) determines the position of the steering column based on inputs received from position sensor located in the tilt and telescoping actuators. The DPM supplies a 5 volt reference and a ground to the sensor and monitors the column position via the steering column tilt and steering column telescope sensor signal circuits.

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 steering column 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.
    • Use a scan tool.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. Tests for the proper operation of the circuit in the low voltage range.

    2.

  2. Tests for the proper operation of the circuit in the high voltage range. If the fuse in the jumper opens if you perform this test, the signal circuit is short to ground.

    3.

  3. Tests for a short to voltage in the 5 volt reference circuit.

    4.

  4. Tests for a high resistance or for an open in the low reference circuit.

Step

Action

Values

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 Vehicle Diagnostic System Check?

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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 Telescope Sensor parameter in the data list for the DPM.

Is the Telescope Sensor parameter within the specified range?

4.80 V -0.12 V

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

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the telescope sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Telescope Sensor parameter.

Is the Telescope Sensor parameter less than the specified value?

0.12 V

Go to Step 4

Go to Step 11

4

  1. Turn OFF the ignition.
  2. Connect a 3-ampere fused jumper wire between the 5 volt reference circuit of the telescope sensor and the signal circuit of the telescope sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Telescope Sensor Data parameter.

Is the Telescope Sensor Data parameter greater than the specified value?

4.80 V

Go to Step 5

Go to Step 9

5

  1. Disconnect the fused jumper wire.
  2. Measure the voltage between the 5 volt reference circuit of the telescope sensor and the low reference circuit of the telescope sensor.

Is the voltage less than the specified value?

5.00 V

Go to Step 6

Go to Step 7

6

  1. Turn OFF the ignition.
  2. Disconnect the negative battery cable.
  3. Measure the resistance from the low reference circuit of the telescope actuator sensor to a good ground.

Is the resistance less than the specified value?

5 ohms

Go to Step 13

Go to Step 12

7

Test the 5 volt reference circuit of the telescope sensor for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 18

Go to Step 8

8

Test the low reference circuit of the telescope sensor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 18

Go to Step 14

9

Test the 5 volt reference circuit of the telescope sensor for one of the following conditions:

    • A short to ground
    • A high resistance
    • An open

Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 18

Go to Step 10

10

Test the signal circuit of the telescope sensor for one of the following conditions:

    • A short to ground
    • A high resistance
    • An open

Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 18

Go to Step 14

11

Test the signal circuit of the telescope sensor for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 18

Go to Step 14

12
  1. Disconnect the DPM.
  2. Test the low reference circuit of the telescope sensor for a high resistance or for an open. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 18

Go to Step 14

13

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

Did you find and correct the condition?

--

Go to Step 18

Go to Step 15

14

Inspect for poor connections at the harness connector of the DPM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 18

Go to Step 16

15

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

Did you complete the replacement?

--

Go to Step 18

--

16

Replace the DPM. Refer to Memory Seat Control Module Replacement .

Did you complete the replacement?

--

Go to Step 18

--

17

Perform the Steering Column Control Module Programming. Refer to Control Module Setup .

Did you complete the action?

--

Go to Step 18

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18
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC.

Does the DTC reset?

--

Go to Step 2

System OK