B285A

DTC B285A

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 B285A 39
- Steering Column Position Module Internal Malfunction

DTC B285A 4B
- Steering Column Position Module Calibration Not Learned

Circuit/System Description

The steering column has a tilt/telescoping control system that consists of an electronic control module capable of LIN message communication, a steering column power assembly with positioning motors and sensors, and a steering column control switch. The column position module will wake up either by the LIN bus or by the tilt/telescope steering column switch. Vehicle symptoms will cause the customer to bring the vehicle in for service.

The tilt/telescope steering column has a four-position switch. The switch may be used to adjust the position of the steering wheel rearward or forward which is telescope and up or down which is tilt. The position of the column may be changed as follows:

* Press the switch up to tilt the column up.

* Press the switch down to tilt the column down.

* Press the switch forward and the column moves toward the front of the vehicle.

* Press the switch rearward and the column moves toward the rear of the vehicle.

Two position sensors are Hall Effect sensors and are used by the column position module. The column position module provides a 5 V reference voltage and a ground to both the tilt and telescoping position sensors. The sensor feedback circuit voltage varies from 0-5 V. Each sensor is part of the motor assembly. The column position module monitors the feedback voltage to determine the column position.

The column position module will wake up either by the LIN bus or by the tilt/telescope steering column switch. All DTCs and data from column position module is communicated through the LIN bus and stored in the memory seat module.

Reference Information

Schematic Reference

Tilt/Telescoping Steering Column Schematics Tilt/Telescoping Steering Column Schematics

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

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

Circuit/System Verification

1. Ignition ON. Verify that DTC B285A 39 or B285A 4B is not set.

• DTC B285A 39 is set
Replace the K99 steering column control module.

• DTC B285A 4B is set

1. Perform the Steering Column Tilt Wheel and Telescope Control Module Learn. Refer to Steering Column Tilt Wheel and Telescope Control Module Learn Steering Column Tilt Wheel and Telescope Control Module Learn

2. Verify that DTC B285A 39 does not reset.

• DTC B285A 4B is set
Replace the K99 steering column control module.

• DTC B285A 4B is not set

3. All OK

• DTC B285A 39 or B285A 4B is not set.

2. All OK.

Repair Instructions

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

* Steering Column Tilt Wheel and Telescope Control Module Learn Steering Column Tilt Wheel and Telescope Control Module Learn

* Control Module References Control Module References for steering column position control module replacement, setup, and programming