070089021N

File in Section:
Bulletin No.:
Service Bulletin
Date:
00 - General Information
07-00-89-021N
November, 2012
INFORMATION
Subject:
Supplemental Information on Trailer Towing and Recreational Vehicle Towing
(Dinghy Towing)
Models:
2008-2013 Buick Enclave
2009-2013 Chevrolet Traverse
2007-2013 GMC Acadia
2007-2010 Saturn OUTLOOK
This bulletin is being revised to add the 2013 model year. Please discard Corporate Bulletin
Number 07-00-89-021M (Section 00 – General Information).
The purpose of this bulletin is to inform dealers of
special procedures necessary when towing a trailer or
when towing the vehicle behind a recreational vehicle.
Towing a Trailer
Trailer Weight Information
The following chart shows how much the trailer can
weigh, based on the vehicle powertrain combination
and whether the vehicle is equipped with Trailer
Provision (RPO V92). Retailers should refer customers
to the appropriate Owner Manual for important trailering
tips, vehicle maintenance, and safety rules before
towing a trailer.
Maximum Trailer Weight for Vehicles
Built Prior to 12/04/08
Maximum Trailer Weight for Vehicles
Built After to 12/04/08
2007-2013 GMC Acadia,
2007-2010 Saturn OUTLOOK Equipped
with Trailer Provisions (RPO V92)
4,500 lb. (2,041 kg)
5,200 lb. (2,359 kg)
2007-2013 GMC Acadia,
2007-2010 Saturn OUTLOOK Equipped
without Trailer Provisions (RPO V92)
2,000 lb. (907 kg)
2,000 lb. (907 kg)
2008-2013 Buick Enclave Equipped with
Trailer Provisions (RPO V92)
4,500 lb. (2,041 kg)
4,500 lb. (2,041 kg)
2008-2013 Buick Enclave Equipped
without Trailer Provisions (RPO V92)
2,000 lb. (907 kg)
2,000 lb. (907 kg)
2009-2013 Chevrolet Traverse Equipped
with Trailer Provisions (RPO V92)
5,200 lb. (2,359 kg)
5,200 lb. (2,359 kg)
2009-2013 Chevrolet Traverse Equipped
without Trailer Provisions (RPO V92)
2,000 lb. (907 kg)
2,000 lb. (907 kg)
Vehicle
Towing a Trailer with a Vehicle without Trailer
Provisions (RPO V92) (2007 Model Year Only)
These vehicles must be modified by installing a new
underhood bussed electrical center (UBEC) to provide
full functionality for 4 circuits: ground, tail lamps, RH
and LH stop/turn lamps. Perform this modification only
if the customers will be using the vehicle to tow.
Copyright 2012 General Motors LLC. All Rights Reserved.
The replacement of the UBEC remains the best
solution to upgrade the vehicles wiring for towing. The
electrical circuitry for the tail/stop lamps is controlled by
the BCM and splicing into the body harness is not
recommended.
Page 2
November, 2012
The backup lamp circuit will also need to be modified
using the following procedure:
1. Disconnect the X7 connector from the Body
Control Module (BCM).
2. Remove the terminal for pin 3 from the BCM X7
connector. The wire to this terminal is dark blue
and is the 38 circuit.
3. Re-connect the X7 connector to the BCM.
4. Cut the terminal off the end of this wire and strip
the end of the wire.
5. Splice this wire into the 24 circuit wire that goes
into BCM connector X6, pin 2. The 24 circuit is light
green.
Towing a Trailer with a Vehicle without Trailer
Provisions (RPO V92) (2008-2012 Model Year Built
Prior to May 01, 2012)
These vehicles must be modified by installing a new
underhood bussed electrical center (UBEC) to provide
full functionality for 4 circuits: ground, tail lamps, RH
and LH stop/turn lamps. Perform this modification only
if the customers will be using the vehicle to tow.
Bulletin No.: 07-00-89-021N
The replacement of the UBEC remains the best
solution to upgrade the vehicles wiring for towing. The
electrical circuitry for the tail/stop lamps is controlled by
the BCM and splicing into the body harness is not
recommended.
Towing a Trailer with a Vehicle without Trailer
Provisions (RPO V92) (2012–2013 Model Year Built
After April 30, 2012)
These vehicles must be modified by installing the
necessary relays and fuses into the underhood bussed
electrical center (UBEC) to provide full functionality for
4 circuits: ground, tail lamps, RH and LH stop/turn
lamps. Refer to the illustration below for relay and fuse
locations. Perform this modification only if the
customers will be using the vehicle to tow.
2704723
Recreational Vehicle Towing (Dinghy
Towing)
Recreational Vehicle Towing Information
Important: Vehicles that are “dinghy towed” must be
started at the beginning of each day and at each fuel
stop for a minimum of five minutes.
Recreational vehicle towing means towing the vehicle
behind another vehicle – such as behind a motorhome.
The two most common types of recreational vehicle
towing are known as "dinghy towing" (towing the
vehicle with all four wheels on the ground) and "dolly
towing" (towing the vehicle with two wheels on the
ground and two wheels up on a device known as a
"dolly"). With the proper preparation and equipment,
Bulletin No.: 07-00-89-021N
November, 2012
Page 3
many vehicles can be towed in these ways. Refer to the
appropriate model/model year Owner Manual for
towing preparation guidelines and dolly and dinghy
towing procedures. The Towing Chart below
summarizes powertrain combination compatibility with
dolly and dinghy towing methods.
Recreational Vehicle Towing Chart
Powertrain Combination and Towing
Method
Rear Wheels on a Tow
Dolly
Front Wheels on a Tow
Dolly
All Four Wheels on the
Ground (Dinghy)
3.6L V6 (LY7) Engine with Front-Wheel Drive
and 6T75 Six-Speed Automatic
Transaxle (MY9)
No
Yes
Yes*
3.6L V6 (LY7) Engine with All-Wheel Drive
and 6T75 Six-Speed Automatic
Transaxle (MH6)
No**
No**
Yes*
*Caution: These vehicle can be dinghy towed from
the front for unlimited miles at 65 mph (105 km/h).
To avoid vehicle damage, never exceed 65 mph
(105 km/h) while towing these vehicles. The repairs
would not be covered by the warranty.
**Caution: Dolly towing an all-wheel drive vehicle
may result in premature failure of the rear drive
module.
Dinghy Towing Procedure (2007-2008 Model Year)
Caution: If you tow your vehicle without performing
each of the steps listed under "Dinghy Towing,"
you could damage the automatic transmission. Be
sure to follow all steps of the dinghy towing
procedure prior to and after towing your vehicle.
Caution: Don't tow a vehicle with the front drive
wheels on the ground if one of the front tires is a
compact spare tire. Towing with two different tire
sizes on the front of the vehicle can cause severe
damage to the transmission.
Important: All-wheel drive vehicles may only be
dinghy towed from the front, with all four wheels on the
ground.
1. Position the vehicle to tow. Shift the transmission
to PARK (P) and turn the ignition to OFF.
2. Securely attach the vehicle being towed to the tow
vehicle.
3. Set the parking brake.
4. Turn the ignition to ACCESSORY.
5. Shift your transmission to NEUTRAL (N).
2519677
6. To prevent your battery from draining while the
vehicle is being towed, remove the 50 amp BATT1
fuse (1) in the UBEC and store in a safe location.
7. Release the parking brake.
Once you have reached your destination, do the
following steps:
1. Set the parking brake.
2. Reinstall the BATT1 fuse.
3. Shift the transmission to PARK (P), turn the ignition
key to OFF and remove the key from the ignition.
4. Release the parking brake.
Page 4
November, 2012
Dinghy Towing Procedure (2009-2012 Model Year
Built Prior to May 01, 2012)
Caution: If you tow your vehicle without performing
each of the steps listed under "Dinghy Towing,"
you could damage the automatic transmission. Be
sure to follow all steps of the dinghy towing
procedure prior to and after towing your vehicle.
Caution: Don't tow a vehicle with the front drive
wheels on the ground if one of the front tires is a
compact spare tire. Towing with two different tire
sizes on the front of the vehicle can cause severe
damage to the transmission.
Important: All-wheel drive vehicles may only be
dinghy towed from the front, with all four wheels on the
ground.
1. Position the vehicle to tow. Shift the transmission
to PARK (P) and turn the ignition to OFF.
2. Securely attach the vehicle being towed to the tow
vehicle.
3. Set the parking brake.
4. Turn the ignition to ACCESSORY.
5. Shift your transmission to NEUTRAL (N).
Bulletin No.: 07-00-89-021N
Dinghy Towing Procedure (2012–2013 Model Year
Built After April 30, 2012)
Caution: If you tow your vehicle without performing
each of the steps listed under "Dinghy Towing,"
you could damage the automatic transmission. Be
sure to follow all steps of the dinghy towing
procedure prior to and after towing your vehicle.
Caution: Don't tow a vehicle with the front drive
wheels on the ground if one of the front tires is a
compact spare tire. Towing with two different tire
sizes on the front of the vehicle can cause severe
damage to the transmission.
Important: All-wheel drive vehicles may only be
dinghy towed from the front, with all four wheels on the
ground.
1. Position the vehicle to tow. Shift the transmission
to PARK (P) and turn the ignition to OFF.
2. Securely attach the vehicle being towed to the tow
vehicle.
3. Set the parking brake.
Note: If the ignition is turned to the RUN position
during this step, the MIL will illuminate with
DTCs U0100 and P0700 set in the transmission control
module (TCM). To clear the DTCs, the ignition must be
cycled three times.
4. Turn the ignition to ACCESSORY.
5. Shift your transmission to NEUTRAL (N).
2513344
Important: The fuses must be removed in the order
specified.
6. Remove the 15 amp ECM fuse (1) in the UBEC
and store in a safe location.
7. To prevent your battery from draining while the
vehicle is being towed, remove the 50 amp BATT1
fuse (2) in the UBEC and store in a safe location.
8. Release the parking brake.
Once you have reached your destination, do the
following steps:
1. Set the parking brake.
2. Reinstall the BATT1 fuse.
3. Reinstall the ECM fuse.
4. Shift the transmission to PARK (P), turn the ignition
key to OFF and remove the key from the ignition.
5. Release the parking brake.
2734174
Important: The fuses must be removed in the order
specified.
6. Remove the 20 amp ECM 1 fuse (1) in the UBEC
and store in a safe location.
7. To prevent your battery from draining while the
vehicle is being towed, remove the 50 amp BATT1
fuse (3) in the UBEC and store in a safe location.
8. Release the parking brake.
Bulletin No.: 07-00-89-021N
November, 2012
Once you have reached your destination, do the
following steps:
1. Set the parking brake.
2. Reinstall the ECM fuse.
3. Reinstall the BATT1 fuse.
4. Reinstall the ECM 1 fuse.
5. Shift the transmission to PARK (P), turn the ignition
key to OFF and remove the key from the ignition.
6. Release the parking brake.
Parts Information (2007-2012 Model
Year Built Prior to May 01, 2012)
For part numbers and usage of the UBEC, see
Group 02.483 of the appropriate Parts Catalog. Saturn
retailers should refer to the appropriate model year
Parts & Illustration Catalog for the vehicle. Order the
UBEC with the same option content including
RPO V92.
Page 5
Parts Information (2012–2013 Model
Year Built After April 30, 2012)
Part Number
Description
Qty
19116059
Relay
3
19116050
30 Amp Fuse
2
19116042
10 Amp Fuse
4
Warranty Information
Please advise the customer that the installation and
cost of the new underhood bussed electrical center
(UBEC) will not be covered under the vehicle's
warranty.
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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