17NA152

File in Section:
Bulletin No.:
Service Bulletin
Date:
17-NA-152
December, 2017
TECHNICAL
Subject:
Front Seat Slight Rocking Movement While Shifting Weight from Seat, During Hard
Stops, and/or When Driving Over Rough Road Surface
Brand:
Model:
Chevrolet
Model Year:
Date Breakpoint:
from
to
Cruze
(VIN B)
2016
2018
Chevrolet
Equinox
(VIN X)
2018
2018
GMC
Terrain
2018
2018
from
SOP
Engine:
Transmission:
All
All
All
All
to
Prior to
March
30, 2017
Involved Region or Country
North America and N.A. Export Regions
Additional Options (RPOs)
Equinox (VIN X) or Terrain equipped with driver/passenger power seats (AG1) or (AG2)
Cruze (VIN B) equipped with driver power seat (AH5)
Condition
Some customers may comment on feeling slight rocking movement of a front seat while
shifting weight from seat, during hard stops, and/or when driving over rough road
surfaces.
Cause
The cause of the condition may be unintended movement of the driver or passenger seat
vertical adjuster actuator.
Correction
Apply load, then re-torque the three fasteners retaining the seat vertical adjuster actuator
following the Service Procedure below.
Copyright 2017 General Motors LLC. All Rights Reserved.
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December, 2017
Bulletin No.: 17-NA-152
Service Procedure
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1. Prepare the affected seat for removal by powering
the seat cushion to it’s fully upward position, then
lower it approximately 5.0–10 mm (0.20–
0.40 in).
3. Position seat on a clean, protected surface with the
seatback angled down and the underside
accessible.
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2. Remove the seat. Refer to Driver or Passenger
Seat Removal and Installation in SI.
Note: Removal of the seat cushion outer finish cover is
necessary to achieve torque wrench access to all three
fastener positions.
4. Remove the seat cushion outer finish cover (1).
Refer to Front Seat Cushion Outer Finish Cover
Replacement in SI.
Bulletin No.: 17-NA-152
December, 2017
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5. Loosen the three vertical adjuster actuator nuts (1).
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Note: The intent on applying a load to the pinion shaft
(1) is to force full gear mesh, and lessen any teeth
clearance between the gear on the actuator (2) and the
sprocket (3) on the seat track, reducing seat
movement.
__________________________________________________________________
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6. Using a long, regular screwdriver braced against
the seat frame (2), pry against the actuator pinion
shaft (1). This will apply a load which will allow the
pinion gear to be FIRMLY pressed into the
sprocket.
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December, 2017
Bulletin No.: 17-NA-152
8. With the top fastener holding the load, tighten the
middle then the lower nuts to the same torque
specification.
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Important: The three nuts should be tightened in
sequence of top-most nut first, middle second, and
lower last.
7. Continue to apply load to the pinion shaft (3) with
the screwdriver (2), and use a torque wrench (1) to
tighten the top-most fastener first.
Tighten
Tighten the nut to 28 Y (21 lb ft).
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9. Reinstall the seat cushion outer finish cover (1).
Refer to Front Seat Cushion Outer Finish Cover
Replacement in SI.
10. Reinstall the seat to the vehicle. Refer to Driver or
Passenger Seat Removal and Installation in SI.
11. Verify seat movement condition has been
improved/minimized.
Parts Information
No parts are required for this repair.
Warranty Information
For vehicles repaired under the Bumper-to-Bumper
coverage (Canada Base Warranty coverage), use the
following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH)
for coverage information.
Labor
Operation
Description
Labor Time
7080438*
Apply Load, Re-torque Seat
Vertical Adjuster Actuator
Fasteners
0.5 hr
*This is a unique Labor Operation for Bulletin use only.
4784189
Version
4
Modified
June 1, 2017 – Updated text and graphic for step 6.
June 14, 2017 – Added GMC Terrain model.
December 21, 2017 – Added Cruze (VIN B) model.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.
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