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Discussion Starter · #1 ·
Thankfully, I have found this site.....

About 10 months ago, I bought a 2007 FWD Acadia, "without" the towing package. The price was right, and the salesman sent me to his local U-Haul dealer to have the trailer package installed.

I did that, and for the past 10 months, I have been pulling a small motorcycle trailer, with running lights only.

PLEASE HELP.....

here is what I have learned, over the past 10 months, and the past 10 minutes reading through the archives here.

It seems, all my wiring is in place, like I said, I have running lights, but no brake or turn or reverse.

I was also told by 2 different places, that I cannot tap into the wiring for 2 different reasons. First, if you tap into the wires for a trailer package, you mess with the circuit for the airbags, and second, because you can't having LED taillights. I don't know if either of these is true, but I have not done this.

Also, I was told by the local dealer to buy the "fuse block" and this would fix my problem, but he would not guarantee it would work.

TSB? Tech Bulletin???? What is this, is it for a 2007 and is the dealer responsible???

Anyways, any advice/help is appreciated. I would like to be towing my bike trailer legally.....

JJ
2007 fwd acadia
u-haul class 3 hitch
i have running lights, nothing else
 

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I also have an 07 that i got without the tow package, oversight on my part. I purchased the hitch from etrailer.com and the harness, with all the necessary wires, from gmpartsdirect. I asked my dealer to replace the fuse block, but didn't know anything about a warranty fix at the time. Since i know the service manager i got the fuse block at their cost. I look at it this way, with me purchasing the fuse block, now i have spare fuses, relays etc. The fuse block is fairly simple to change out. I haven't added a brake controller yet since i very seldom tow with the Acadia. I wanted it mainly for a scooter lift and just in case i decided to tow something.
 

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I have the 2008 without the tow package and I was told that the warranty covered the 2007 fuse block but not the 2008 fuse block. I was also told that I could get an aftermarket hitch and wiring package installed that did not use the pre-existing wiring for $225. That might be an option for you.

One thing to remember, even if you put a hitch on, you cannot tow the 4500 lbs. I think you can only tow 2500 (or 2000).
 

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GM will fix the fuse block under warranty on the 07. I would definantly take it in and have it fixed. Tapping into the lights is a bad idea. I had mine done and have had problems with the tail lights ever since. The led lights do not like brake lights tapped into them.
 

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It could be that LED lights don't like tapped into. My dealer said the after market install has some type of adapter box that is compatible, but I agree that if you can get the block fixed under warranty, then that is the way to go.
 

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Discussion Starter · #6 ·
Wow, it took almost a year, but finally.....

After finding this site and reading through the archives, I found the service bulletin and took that to my dealer.

The TSB covers all Acadia's manufactured befored July 2007, mine was June, and the warranty does cover the fuse block.

Parts are on order, and I should have proper lighting in no time.

Thanks

JJ
 

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JJ,

Where can I find this TSB, or is there a TSB number I can give my dealer. My first attempt to get the fuse block was denied and the service dept. told me to have UHual tap in. I haven't had any issues but I might as well get it done the right way. Thanks

'07 Acadia

jjsv650 said:
Wow, it took almost a year, but finally.....

After finding this site and reading through the archives, I found the service bulletin and took that to my dealer.

The TSB covers all Acadia's manufactured befored July 2007, mine was June, and the warranty does cover the fuse block.

Parts are on order, and I should have proper lighting in no time.

Thanks

JJ
 

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Arcalot said:
JJ,

Where can I find this TSB, or is there a TSB number I can give my dealer. My first attempt to get the fuse block was denied and the service dept. told me to have UHual tap in. I haven't had any issues but I might as well get it done the right way. Thanks

'07 Acadia

jjsv650 said:
Wow, it took almost a year, but finally.....

After finding this site and reading through the archives, I found the service bulletin and took that to my dealer.

The TSB covers all Acadia's manufactured befored July 2007, mine was June, and the warranty does cover the fuse block.

Parts are on order, and I should have proper lighting in no time.

Thanks

JJ
Here ya go....

#07-00-89-021B: Supplemental Information on Trailer Towing and Recreational Vehicle Towing (Dinghy Towing) - (Nov 8, 2007)

Subject: Supplemental Information on Trailer Towing and Recreational Vehicle Towing (Dinghy Towing)

Models: 2008 Buick Enclave
2007-2008 GMC Acadia
2007-2008 Saturn OUTLOOK

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This bulletin is being revised to add the 2008 model year and update the information on towing a trailer. Please discard Corporate Bulletin Number 07-00-89-021A (Section 00 - General Information).

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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.

Vehicle
Maximum Trailer Weight

Front-Wheel Drive and 6-Speed Automatic Transaxle (MY9) with Trailer Provisions (V92)
4,500 lb. (2,041 kg)

Front-Wheel Drive and 6-Speed Automatic Transaxle (MY9) without Trailer Provisions (V92)
2,000 lb. (907 kg)

All-Wheel Drive and 6-Speed Automatic Transaxle (MH6) with Trailer Provisions (V92)
4,500 lbs. (2,041 kg)

All-Wheel Drive and 6-Speed Automatic Transaxle (MH6) without Trailer Provisions V92
2,000 lb. (907 kg)


Towing a Trailer with a Vehicle without Trailer Provisions (RPO V92)
These vehicles can tow a maximum trailer weight of 2,000 lb. (907 kg).

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. Refer to the Parts Information section in this bulletin for the correct part numbers. To find the original part number, remove the UBEC and look at the side of the UBEC. Perform this modification only if the customers will be using the vehicle to tow.

Due to the omission of information about trailer towing for vehicles without the Trailer Provision (V92) in the Owner's Manual, this modification will only be covered under warranty for the 2007 GMC Acadia, 2007 Saturn OUTLOOK and the 2008 Buick Enclave (built prior to July 2, 2007).

The Owner's Manual for the 2008 GMC Acadia, 2008 Saturn OUTLOOK and 2008 Buick Enclave (built after July 1, 2007) have been corrected and the policy to cover the UBEC replacement as an approved warranty repair for these vehicles has been rescinded. This modification has changed to a customer pay upgrade.

The replacement of the UBEC remains the best solution to upgrade the vehicles wiring for towing. The electrical circuitry for the tail/stop lamps are controlled by the BCM and splicing into the body harness is not recommended.

Towing a Trailer with a Vehicle with Trailer Provisions (RPO V92)
These vehicles can tow a maximum trailer weight of 4,500 lb. (2,041 kg).

It is necessary to modify the backup lamp circuit. Perform this procedure only if the customer will be using the vehicle to tow.

Disconnect the X7 connector from the Body Control Module (BCM).
Remove the terminal for pin 3 from the BCM X7 connector. The wire to this terminal is dark blue and is the 38 circuit.
Re-connect the X7 connector to the BCM.
Cut the terminal off the end of this wire and strip the end of the wire.
Splice this wire into the 24 circuit wire that goes into BCM connector X6, pin 2. The 24 circuit is light green.
Recreational Vehicle Towing (Dinghy Towing)
Important: To avoid battery rundown while towing, remove the 50 amp BATT1 fuse in the UBEC. Refer to the dinghy towing procedure in this bulletin.

Recreational Vehicle Towing Information
Important: Vehicles with a 6-speed automatic transmission 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, 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*


*Notice: If the vehicle is equipped with a 6T75 six-speed automatic transmission, it 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 Buick Enclave, GMC Acadia and Saturn OUTLOOK vehicles. The repairs would not be covered by the warranty.

Dinghy Towing Procedure
Notice: 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.

Notice: 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: Buick Enclave, GMC Acadia and Saturn OUTLOOK vehicles may only be dinghy towed from the front, with all four wheels on the ground.

Position the vehicle to tow and then secure it.
Shift transmission to PARK (P) and turn the ignition to OFF.
Set the parking brake.
Turn the ignition to ACCESSORY.
Shift your transmission to NEUTRAL (N).
To prevent your battery from draining while the vehicle is being towed, remove the 50 amp BATT1 fuse in the UBEC, and store in a safe location.
Release the parking brake.
Once you have reached your destination, do the following steps:

Set the parking brake.
Reinstall the BATT1 fuse.
Shift the transmission to PARK (P), turn the ignition key to OFF and remove the key from the ignition.
Release the parking brake.
Parts Information
Part Number
Description

25784721
Underhood Bussed Electrical Center

(replaces 25784722)

25784723
Underhood Bussed Electrical Center

(replaces 25784726)

25784725
Underhood Bussed Electrical Center (replaces 25784724)


Warranty Information
For vehicles repaired under warranty as outlined above, use:

Labor Operation
Description
Labor Time

N1730
Block Assembly, Wiring Harness Junction - Engine - Replace
Use Published Labor Operation Time
 
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