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B2861




DTC B2861

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptors
DTC B2861
- Driver Telescope Sensor Circuit Performance

Circuit/System Description

The telescoping function of this column consists of the telescoping motor, the telescoping motor position sensor and the telescoping switch. The telescoping motor position sensor is an internal part of the telescoping steering motor. The memory seat module (MSM) supplies a 5 V reference voltage through the 5 V reference circuit and ground through the low reference circuit to the telescoping motor position sensor. When the motor rotates, the resistance of the potentiometer varies changing the feedback voltage of the position sensor signal circuit. The MSM monitors this voltage signal to determine the position of the steering wheel. When the MSM detects that position sensor signal circuit is out of the voltage range of 0.25-4.75 V, a DTC will be set for that signal circuit.

Conditions for Running the DTC

* DTC B1327 must not be present.
* Battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

B2861

These DTCs will set when the MSM receives a signal form the steering column telescope position sensor that a motor being driven in a commanded direction changes by more than 10 counts (0.2 V) in the wrong direction. The signal mismatches what the MSM is commanding the motors to perform.

Actions Taken When the DTC Sets

The motor associated with the fault will be disabled for memory functions.

Conditions for Clearing the DTCs

* The condition responsible for setting the DTC no longer exists.
* The history DTC will clear once 50 consecutive fault-free ignition cycles have occurred.

Diagnostic Aids

The memory seat module is also referred to as the Driver Position Module in certain scan tool menus.

Reference Information
Schematic Reference

Tilt/Telescoping Steering Column Schematics (Tilt/Telescoping Steering Column Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Steering Wheel and Column Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing For Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the X280 harness connector at the steering column telescope motor assembly.
2. Verify that the appropriate control circuit terminals listed below are in the correct harness connector cavities:

* Motor in control terminal A
* Motor out control terminal B
* Steering column telescope position sensor 5 V reference terminal D
* Steering column telescope position sensor low reference terminal E

If the wires are not in the correct cavities, make the appropriate changes.

3. If all circuits test normal, replace the MSM.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Control Module References (Programming and Relearning) for MSM replacement, setup, and programming