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Power Steering Assist Motor Replacement

Fig 1: Power Steering Assist Motor & Bolts
GM2393001Courtesy of GENERAL MOTORS COMPANY
Callout Component Name
CAUTION:

Electrostatic discharge (ESD) can damage many solid-state electrical components. ESD susceptible components may or may not be labeled with the ESD symbol. Handle all electrical components carefully. Use the following precautions in order to avoid ESD damage:

  • Touch a metal ground point in order to remove your body's static charge before servicing any electronic component; especially after sliding across the vehicle seat.
  • Do not touch exposed terminals. Terminals may connect to circuits susceptible the ESD damage.
  • Do not allow tools to contact exposed terminals when servicing connectors.
  • Do not remove components from their protective packaging until required to do so.
  • Avoid the following actions unless required by the diagnostic procedure:
    • Jumpering or grounding of the components or connectors.
    • Connecting test equipment probes to components or connectors. Connect the ground lead first when using test probes.
  • Ground the protective packaging of any component before opening. Do not rest solid-state components on metal workbenches, or on top of TVs, radios, or other electrical devices.
CAUTION:

During removal and installation, all EPS components including mechanical and/or electrical is extremely susceptible to damage. Dropping or prying on any EPS component may cause internal damage. If damage occurs or a part is dropped, the EPS component must be replaced.

CAUTION:

Care must be taken during removal and installation of the Electronic Power Steering (EPS) components to not hit or break the EPS motor/controller module or module harness connectors. If the EPS motor/ controller module or module connectors are damaged, the complete component must be replaced.

Preliminary Procedures

  1. Perform the strategy based diagnosis. Performing the strategy based diagnostics includes reviewing related bulletins, preliminary information and diagnostics. Strategy Based Diagnosis
  2. Capture the key cycle count from the OLD steering gear control module. If the key cycle count from the OLD steering gear control module is NOT captured, it will NOT be possible to flash the NEW steering gear control module. Power Steering Control Module Programming and Setup
  3. Electric Dual Pinion Rack and Pinion Steering Gear Replacement 
NOTE:
  • The power steering control module is part of the power steering assist motor.
  • If communication with the OLD power steering control module cannot be established, then replace the entire steering gear as an assembly. Do NOT proceed with replacement of just the power steering assist motor.
1 Power Steering Assist Motor Bolt (Qty: 3)
WARNING:

This vehicle is equipped with torque-to-yield or single use fasteners. Install a NEW torque-to-yield or single use fastener when installing this component. Failure to replace the torque-to-yield or single use fasteners could cause damage to the vehicle, component, or bodily injury.

CAUTION:

Refer to Fastener Caution .

Procedure

  1. Remove the power steering assist motor bolts.

    DISCARD the bolts.

  2. Install the NEW power steering assist motor bolts.

Tighten 
8 N.m (71 lb in)
2 Power Steering Assist Motor

Procedure

  1. Remove the O-ring from the steering gear housing.

    DISCARD the O-ring seal.

  2. Inspect the steering gear motor shaft and inside of the steering gear housing for signs of water intrusion or corrosion. If no signs of water intrusion or corrosion are present proceed to the next step. If signs of water intrusion or corrosion are present then replace the steering gear. Electric Dual Pinion Rack and Pinion Steering Gear Replacement 
  3. Install a NEW O-ring around the steering gear housing.
  4. Install the steering gear coupling to the assist motor armature.
  5. Align the steering gear coupling on the assist motor armature to the steering gear.
  6. Align the power steering assist motor bolts to the steering gear while pressing the motor over the gear housing O-ring.
  7. After installation is complete, transfer the key cycle count from the OLD steering gear control module to the NEW steering gear control module. Power Steering Control Module Programming and Setup
NOTE:

Inspection of the steering gear motor shaft and the inside of the steering gear housing is required to ensure there are NO signs of water intrusion or corrosion which may cause premature motor failure. If signs of water intrusion or corrosion are present the steering gear MUST be replaced.
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