Vehicle - Dinghy and Trailer Towing Information
Bulletin No.: 07-00-89-021Date: May 22, 2007
INFORMATION
Subject:
Supplemental Information on Recreational Vehicle and Trailer Towing and Trailer Wiring Accommodation for Non-V92 Equipped Vehicles
Models:
2007 GMC Acadia
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 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.
Towing a Trailer with a Vehicle NOT Equipped with Trailer Provisions
2007 GMC Acadia 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 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.
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.
To avoid battery rundown while towing, disconnect the battery prior to towing. Refer to Battery Negative Cable Disconnection and Connection in SI or Battery in the Owners Manual.
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 year GMC Acadia Owner Manual for towing preparation guidelines and dolly and dinghy towing procedures. The Towing Chart shown summarizes powertrain combination compatibility with dolly and dinghy towing methods.
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 GMC Acadia vehicles. The repairs would not be covered by the warranty.
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.
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.
GMC Acadia 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.
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, disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in SI or Battery in the Owners Manual.
Release the parking brake.
Once you have reached your destination, do the following steps:
Set the parking brake.
Reconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in SI or Battery in the Owners Manual.
Turn the ignition key to OFF and remove the key from the ignition.
Parts Information
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer