GMC 2009 Savana Van Owner's Manual page 242

Trailer Wiring Harness
The optional heavy-duty trailer wiring package includes
a wiring harness, with a seven-pin connector at the
rear of the vehicle and a four-wire harness assembly
under the driver side of the instrument panel. The
four-wire harness assembly comes without a connector.
If the vehicle does not have a trailer hitch, the
seven-wire harness assembly with connector is taped
together and located in a frame pocket at the driver side
rear left corner of the frame.
If the vehicle has a trailer hitch, the seven-wire harness
assembly with connector is attached to a bracket on
the hitch platform. In both cases, the seven-wire harness
has a connector and includes a 30-amp feed wire.
The seven-wire harness connector contains the following
trailer circuits:
•
Light Green: Back-up Lamps (10A fuse)**
•
White: Ground
•
Dark Blue: Trailer Brake Signal
•
Dark Green: Right Rear Stop and Turn Signal*
•
Red/Black Stripe: Battery Feed (30A Fuse)
•
Brown: Trailer Park Lamp Supply Voltage
(15A fuse)**
•
Yellow: Left Rear Stop and Turn Signal *
4-40
The four-wire harness (without connector) contains the
following circuits:
•
Black: Ground
•
Red/White: Battery Feed
•
Dark Blue: Trailer Brake Signal
•
Light Blue: CHMSL/Stoplamp Supply Voltage
* If the vehicle is a cutaway with trailer provisions, a
15 amp fuse will be shared for both left/stop trailer turn
and right/stop trailer turn signals. However, the
cutaway lighting connector will have a 10 amp fuse for
each signal.
** If the vehicle is a cutaway with trailer provisions, a
15 amp fuse will be shared for trailer park lamps
and cutaway rear lighting connector park lamps. Also, a
10 amp fuse will be shared for trailer back-up lamps
and cutaway rear lighting connector back-up lamps.