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Old 02-07-2008, 11:00 PM   #1
tcxr
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Default 2008 Trailer Wiring BCM replacement?

I have searched all the Forums (Outlook, Acadia, Enclave) trying to find more info on replacing the BCM so the trailer wiring harnes will work. I have a 2008 Outlook XR and most of the info I have come across is referring to a 2007 model. Has anyone been successful with either having the dealer replace it or done it themselves? My dealer would consider replacing it but they are uncertain of the right part #. The part #'s that are listed on the TSB for the 2007 doesn't match the part # in my Outlook. If I could get a part # I would do it myself. Help with suggestions or part #. Thanks

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Old 02-07-2008, 11:40 PM   #2
f3qu3t
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2005 VUE 2.2L
Default Re: 2008 Trailer Wiring BCM replacement?

I haven't heard of anyone needing to replace a BCM, but have come across info on upgrading a UBEC. I think the fuse box needs to be switched out for the V92 box.

Supplemental Information on Recreational Vehicle and Trailer Towing and Trailer Wiring Accommodation for Non-V92 Equipped Vehicles #07-00-89-021A - (06/27/2007)

...
2008 XR FWD :: Garnet:Ebony | Heated Leather | 2nd Row Captains Chairs | Trailering PKG | Remote Start | Heated Washer Fluid ::
...
2000 LS1 : 1998 SC2

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Old 02-08-2008, 12:33 AM   #3
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Default Re: 2008 Trailer Wiring BCM replacement?

That TSB is for the 2007. I stand corrected, I am looking for the part # for the fuse box for the v92. Thanks for your response.

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Old 02-08-2008, 01:01 PM   #4
scottginfla
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Default Re: 2008 Trailer Wiring BCM replacement?

see if this part number helps 25784721

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Old 02-08-2008, 08:53 PM   #5
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Default Re: 2008 Trailer Wiring BCM replacement?

okay I'll bite .. what's a UBEC and BCM ?

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Old 02-08-2008, 08:56 PM   #6
derwin
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Default Re: 2008 Trailer Wiring BCM replacement?

Okay so a quick google answered that for me...

and is this of any help or is it old news?



Picture of RV Roamer

Posted August 19, 2007 03:12 PM
GM has issued a TSB revising the dinghy (4-down) towing procedure for the GMC Acadia, Saturn Outlook and Buick Enclave. If your owner manual says to remove a 10A IGN fuse or to disconnect the battery negative terminal, these instructions supercede that. It also revises the trailer towing weight limits.

*************************************************
Subject: Supplemental Information on Recreational Vehicle and Trailer Towing and Trailer Wiring Accommodation for Non-V92 Equipped Vehicles #07-00-89-021A - (06/27/2007)

Models: 2008 Buick Enclave

2007 GMC Acadia

2007 Saturn OUTLOOK

This bulletin is being revised to add models and revise dinghy towing procedures. Please discard Corporate Bulletin Number 07-00-89-021 (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. 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
3.6L V6 (LY7) Engine with Front-Wheel Drive and 6-Speed Automatic Transaxle (MY9) with Trailer Provisions (V92) 4,500 lb. (2,041 kg)
3.6L V6 (LY7) Engine with Front-Wheel Drive and 6-Speed Automatic Transaxle (MY9), NO Trailer Provisions 2,000 lb. (907 kg)
3.6L V6 (LY7) Engine with All-Wheel Drive and 6-Speed Automatic Transaxle (MH6) with Trailer Provisions (V92) 4,500 lbs. (2,041 kg)
3.6L V6 (LY7) Engine with All-Wheel Drive and 6-Speed Automatic Transaxle (MH6), NO Trailer Provisions 2,000 lb. (907 kg)
Towing a Trailer with a Vehicle NOT Equipped with Trailer Provisions
2008 Buick Enclave, 2007 GMC Acadia and 2007 Saturn OUTLOOK vehicles that are not equipped with trailer provisions (RPO V92) must be modified with 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.
This UBEC replacement should only be performed for customers who perform trailer towing. UBEC replacement for trailer towing is only covered under warranty for 2007 model year GMC Acadia and Saturn OUTLOOK vehicles, and 2008 Buick Enclave vehicles.
Towing a Trailer with a Vehicle with Trailer Provisions (RPO V92)
The following procedure may need to be performed to the backup lamp circuit. Perform this procedure only if the customer will be using the vehicle to tow.
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.
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.
2008 Buick Enclave, 2007 GMC Acadia, 2007 Saturn OUTLOOK 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.
1. Position the vehicle to tow and then secure it.
2. Shift transmission to PARK (P) and turn the ignition to OFF.
3. Set the parking brake.
4. Turn the ignition to ACCESSORY.
5. Shift your transmission to NEUTRAL (N).
6. 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.
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.
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, use:
Labor Operation Description Labor Time
N1730 Block Assembly, Wiring Harness Junction - Engine - Replace 0.3 hr

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.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

Copyright General Motors Corporation. All Rights Reserved.

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Old 02-09-2008, 01:41 AM   #7
tcxr
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Default Re: 2008 Trailer Wiring BCM replacement?

What am looking for is either someone who has a 2008 Outlook that has had the dealer replace the UBEC or has done it themselves. Scottginfla thanks for the part # but my dealer is saying that it is a production # and they don't have a crossover # that would allow them to order it. Not sure what that means. As for the TSB that was just posted that doesn't cover the 2008 Outlook and the dealer said there has been no further updates. Still taking suggestions and ideas. Thanks

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Old 02-09-2008, 07:39 AM   #8
scottginfla
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Default Re: 2008 Trailer Wiring BCM replacement?

TCXR, the part number i provided is exactly the one my local dealer has used to replace the bcm on several non v92 08 xr's to make them v92, maybee you should talk to another dealer.

you may also need the number on a tag located undernieth the bcm, no need to unhook anything, but you do need to pry it up off the base, when you do you will see a tag with some type of number.

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Old 02-11-2008, 12:08 PM   #9
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Default Re: 2008 Trailer Wiring BCM replacement?

Thanks again, scottginfla. I will pull the fuse box and see if there are any #s. Has your dealer replaced these on a 2008 while under warranty? I am hoping there will be a update to the TSB to include the 2008 Outlook in the near future.

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Old 02-11-2008, 01:09 PM   #10
scottginfla
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Default Re: 2008 Trailer Wiring BCM replacement?

am not aware of dealer doing any 08's under warranty, but have heard of them not charging for the part as a "courtesy". charging only the 0.3 book labor for it.

...
2008 outlook xr, silver pearl and black leather, build date 08/07

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Old 07-31-2016, 12:02 PM   #11
bfort
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Default Re: 2008 Trailer Wiring BCM replacement?

Looking for help regarding possible 2nd BCM replacement or other possible causes for key stuck in acc position and windows not going down. Specifically, the first time I had this problem, the dealer replaced the BCM and said they saw water intrusion (???). The key stuck in acc and windows not going down happened again a month later. The common link between these incidences was I that had my trailer hooked up. The first time it happened I had just replaced the vehicle harness for the trailer wiring in my aftermarket setup. So I believe this is the problem (too coincidental) and I must have a short there or on the trailer side. I called the dealer to make sure they didnt also replace a fuse with the BCM. They said they did not and to check the headlight fuses as the BCM failure was truly due to the water. The fuses were all good, although there were none for the trailer (not surprising b/c aftermarket). Incidentally, I did have periodic issues with the windows not going down and dimming of the stereo, but assumed those issues to be unrelated
So, does anyone think it may be something else besides my BCM. Is there a fuse for BCM. Is there more than one fuse box? Would fuses in the trailer location help? Where is the BCM and can I replace myself? I know they need to be reprogrammed but can someone other than the dealer do it? Can I order it from the dealer already programmed? Thanks, in advance for any help on this matter. Thanks, in advance for any help on this matter.

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Old 07-31-2016, 01:19 PM   #12
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Default Re: 2008 Trailer Wiring BCM replacement?

If the ignition lock cylinder operates normal in acc run start but can't be turned to lock position. This is usually the switch is the floor shift ( replace the shifter asm.
Water intrusion in the instrument panel fuse block ( bottom right of I/P) causes strange problems including engine runs with Ign off and key removed.
this is more likely with outlooks that have sunroof. The fuse block will hold water for a long time.

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