Section 272 (Drive Axles - QUADRASTEER): Description
WARNING: This page does not describe the selected car, but rather 19 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 GMC Sierra, 2003 Chevrolet Tahoe, and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
This article covers Steering Mechanical Rear information only. For Steering Electronic Rear information see ELECTRONIC - REAR - SIERRA , SILVERADO, TAHOE article.
Quadrasteer(tm) is a 4-wheel steering system that dramatically enhances low speed maneuverability, high speed stability, and towing capability. The system is an electrically powered rear wheel steering system comprised of the following components:
- A steerable, solid hypoid rear axle.
- A steering wheel position sensor located at the base of the steering column.
- A rear wheel position sensor located below the rear wheel steering motor on the rear steering gear.
- An electric motor driven actuator.
- A rear wheel steering control module.
- A combined yaw rate sensor/ lateral accelerometer sensor.
- Three hall effect switches in the motor assembly.
- A mode select switch on the dash.
- A heavy duty wiring harness and fuse.
- A Service 4 Wheel Steer indicator in the IPC.
- A shorting relay in the rear wheel steering gear motor.
- A power relay in the rear wheel steering control module.
The rear wheel steering control module has these inputs:
- Battery voltage.
- Switched battery voltage.
- Rear wheel steering mode switch signal.
- Steering wheel position sensor analog.
- Steering wheel position sensor phase A
- Steering wheel position sensor phase B
- Steering wheel position sensor marker pulse.
- Rear wheel position sensor position 1.
- Rear wheel position sensor position 2.
- Vehicle speed signal.
- Class 2 data.
- Yaw rate signal.
- Lateral accelerometer signal.
- Rear wheel steering motor actuator hall A.
- Rear wheel steering motor actuator hall B.
- Rear wheel steering motor actuator hall C.
The rear wheel steering control module has these outputs:
- Rear wheel steering motor actuator phase A control.
- Rear wheel steering motor actuator phase B control.
- Rear wheel steering motor actuator phase C control.
- Rear wheel steering motor shorting relay voltage.
- Rear wheel steering module class 2 serial data.
- 4- Wheel steer mode indicator supply voltage.
- 4- Wheel steer tow mode indicator supply voltage.
- 2- Wheel steer mode indicator supply voltage.
- Rear wheel steering mode select switch supply voltage.
- Steering wheel position sensor 5 volt reference.
- Rear wheel position sensor 5 volt reference.
- Rear wheel steering motor hall sensor 12 volt reference.
- Rear wheel steering motor shorting relay voltage.
Separate connectors to the rear wheel steering control module are provided for the following 4 capacities:
- Vehicle battery power.
- The vehicle class 2 , steering wheel position , mode select switch , lateral accelerometer , yaw sensor, speed sensor signals.
- The motor phase power leads.
- The motor hall sensors, shorting relay, and rear wheel position sensor signals.