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HOMESERVICE MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 546 (FRAME AND UNDERBODY)REPAIR INSTRUCTIONSASSIST STEP MOTOR REPLACEMENT (POWER BRS)
2009 Chevrolet Tahoe Base, 4.8 C

Assist Step Motor Replacement (Power BRS)

2009 Chevrolet Tahoe Base, 4.8 CSECTION Assist Step Motor Replacement (Power BRS)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Assist Step Motor, Motor Bolts, Motor Wedge & Wedge Bolt
GM1820305Courtesy of GENERAL MOTORS COMPANY
Assist Step Motor Replacement (Power BRS)

Callout Component Name

Preliminary Procedures

  1. Deploy the power assist step. If the motor fails to deploy perform the following.

    Remove the two plastic shield cover screws and cover on the side of the motor assembly.

    Remove the motor housing screws and housing cover from the motor assembly.

    Rotate the armature by hand to fully extend the assist step.

  2. Remove the two motor cover bolts.
  3. Disconnect any electrical connectors.
  4. Remove the three motor bolts.
  5. Remove the wedge bolt and wedge.
  6. Loosen the link nuts, but Do Not Remove.
  7. Pull the motor inboard and rearward in order to clear the weld joint.
  8. Remove the motor.
1 Assist Step Motor Wedge Bolt
CAUTION:

Refer to Fastener Caution .


Tighten 
8 N.m (71 lb in)
2 Assist Step Motor Wedge
3 Assist Step Motor Bolt (Qty: 3)
Tighten 
12 N.m (9 lb ft)
4 Assist Step Motor

Procedure

  1. Pull the motor inboard and wiggle forward to position and install the motor in place.
  2. Install the two link bolts.
  3. Tighten the three link nuts.
  4. Install the motor bolts.
  5. Install the wedge and wedge bolt. The wedge shape should point upward and outward to position correctly.
  6. Install the cover and two motor cover bolts.
  • Make sure the flat on the motor is parallel to the floor before installing. All new motors should be shipped with motor flat in the correct position. As the motor is installed shake the board up and down gently to make sure the wedge and flat seat together correctly or unwanted noise could result.
  • Once the installation of the new motor is completed the assist step must be cycled once for the module to learn the positioning.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.