2008 GMC YUKON DENALI lock

Secondary Latch System
Your vehicle has an underbody-mounted tire hoist
assembly equipped with a secondary latch system.
It is designed to stop the spare tire from suddenly
falling off your vehicle. For the secondary latch to work,
the spare must be installed with the valve stem pointing
down. SeeStoring a Flat or Spare Tire and Tools
on page 5-94.
{CAUTION:
Before beginning this procedure read all the
instructions. Failure to read and follow the
instructions could damage the hoist assembly
and you and others could get hurt. Read and
follow the instructions listed next.To release the spare tire from the secondary latch:
1. Check under the
vehicle to see if the
cable end is visible.
If the cable is not
visible proceed
to Step 6.
2. If it is visible, rst try to tighten the cable by
turning the wheel wrench clockwise until you
hear two clicks or feel it skip twice. You cannot
overtighten the cable.
5-90

3. Loosen the cable by turning the wrench
counterclockwise three or four turns.
4. Repeat this procedure at least two times. If the
spare tire lowers to the ground, continue with
Step 5 ofRemoving the Spare Tire and Tools
on page 5-79.
5. If the spare does not lower, turn the wrench
counterclockwise until approximately 6 inches
(15 cm) of cable is exposed.
6. Stand the wheel blocks on their shortest ends, with
the backs facing each other.
7. Place the bottom edge
of the jack (A) on the
wheel blocks (B),
separating them so that
the jack is balanced
securely.8. Attach the jack handle, extension, and wheel
wrench to the jack and place it (with the wheel
blocks) under the vehicle toward the front of the
rear bumper.
5-91

9. Position the center lift point of the jack under the
center of the spare tire.10. Turn the wrench clockwise to raise the jack until it
lifts the end tting.
11. Continue raising the jack until the spare tire
stops moving upward and is held rmly in place.
The secondary latch has released and the spare tire
is balancing on the jack.
12. Lower the jack by turning the wheel wrench
counterclockwise. Keep lowering the jack until the
spare tire slides off the jack or is hanging by
the cable.
5-92

{CAUTION:
Someone standing too close during the
procedure could be injured by the jack.
If the spare tire does not slide off the jack
completely, make sure no one is behind you or
on either side of you as you pull the jack out
from under the spare.
13. Disconnect the jack handle from the jack and
carefully remove the jack. Use one hand to push
against the spare while rmly pulling the jack out
from under the spare tire with the other hand.
If the spare tire is hanging from the cable, insert the
hoist end of extension, and wheel wrench into the
hoist shaft hole in the bumper and turn the wheel
wrench counterclockwise to lower the spare the rest
of the way.14. Tilt the tire retainer at the end of the cable and pull
it through the wheel opening. Pull the tire out from
under the vehicle.
15. Turn the wheel wrench in the hoist shaft hole in the
bumper clockwise to raise the cable back up if the
cable is hanging under the vehicle.
Have the hoist assembly inspected as soon as you can.
You will not be able to store a spare or at tire using
the hoist assembly until it has been replaced.
To continue changing the at tire, seeRemoving the
Flat Tire and Installing the Spare Tire on page 5-85.
5-93

G. Tire/Wheel Retainer
H. Spare Tire/Flat Tire
(Valve Stem
Pointed Down)I. Hoist Shaft Access Hole
J. Hoist End of
Extension Tool
K. Spare Tire Lock
1. Put the tire (H) on the ground at the rear of the
vehicle with the valve stem pointed down and to
the rear.
2. Tilt the tire toward the vehicle. Separate the
tire/wheel retainer (G) from the guide pin. Pull
the pin through the center of the wheel. Tilt the
retainer down and through the center wheel opening.Make sure the retainer is fully seated across the
underside of the wheel.
3. Assemble the two jack handle extensions (D) and
wheel wrench (E) as shown.
5-95

4. Insert the open end of
the extension (J)
through the hole in the
rear bumper (I) (hoist
shaft access hole).
5. Raise the tire part way upward. Make sure the
retainer is seated in the wheel opening.
6. Raise the tire fully against the underside of the
vehicle by turning the wheel wrench clockwise
until you hear two clicks or feel it skip twice.
You cannot overtighten the cable.7. Make sure the tire is stored securely. Push, pull (A),
and then try to turn (B) the tire. If the tire moves,
use the wheel wrench to tighten the cable.
8. Reinstall the spare tire lock.
9. Reinstall the hoist shaft access cover.
10. Reinstall the hitch cover.
5-96

To store the tools:
A. Wheel Blocks
B. Tool Bag with Jack
Tools
C. Retaining Bracket
D. Wing Nut Retaining
Tool BagE. Jack
F. Wing Nut Retaining
Wheel Blocks
G. Wing Nut on Jack
1. Return the tools (wheel wrench, jack handle, and
jack handle extensions) to the tool bag (B).
2. Assemble wheel blocks (A) and jack (E) together
with the wing nut (F).3. Position the jack (E) and wheel blocks (A) in the
driver’s side trim panel over the wheelhouse.
4. Turn the wing nut (G) clockwise until the jack is
secured tight in the mounting bracket. Be sure to
position the holes in the base of the jack onto the
pin in the mounting bracket.
5. Use the retaining bracket (C) to fasten the tool
bag (B) on the stud and turn the wing nut (D)
clockwise to secure.
6. Return the storage tray to its original stored position.
Regular Wheelbase shown,
Extended Wheelbase similar.
5-97

Instrument Panel Fuse Block
The instrument panel fuse block access door is located
on the driver side edge of the instrument panel.
Fuses Usage
1 Rear Seats
2 rear Accessory Power Outlet
3 Steering Wheel Controls Backlight
4 Driver Door Module
5 Dome Lamps, Driver Side Turn Signal
6 Driver Side Turn Signal, Stoplamp
Fuses Usage
7 Instrument Panel Back Lighting
8 Passenger Side Turn Signal, Stoplamp
9Passenger Door Module, Universal
Home Remote System
10 Power Door Lock 2 (Unlock Feature)
11 Power Door Lock 2 (Lock Feature)
12Stoplamps, Center-High Mounted
Stoplamp
13 Rear Climate Controls
14 Not Used
15 Body Control Module (BCM)
16 Accessory Power Outlets
17 Interior Lamps
18 Power Door Lock 1 (Unlock Feature)
19 Rear Seat Entertainment
20Ultrasonic Rear Parking Assist, Power
Liftgate
21 Power Door Lock 1 (Lock Feature)
22 Driver Information Center (DIC)
23 Rear Wiper
24 Not Used
25Driver Seat Module, Remote Keyless
Entry System
26 Not Used
5-109