lock GMC YUKON XL 2002 Owners Manual

6-391. Remove the headlamp assembly as
mentioned previously.
2. Press the retainer clip (B), located behind the turn
signal housing, towards the outside of the vehicle. 3. Pull the turn signal housing out from the vehicle.
4. Press the locking release lever, turn the bulb
socket counterclockwise and remove it from the
turn signal housing.
5. Remove the bulb from the bulb socket.
6. Put the new bulb into the bulb socket.
7. Put the bulb socket into the turn signal housing and
turn it clockwise until it locks.
8. Put the turn signal housing back onto the vehicle
placing the hook and posts on the inner side into the
alignment holes first and then the outer side into the
retainer bracket until you hear a click.
9. Put the headlamp assembly back into the vehicle.
Center High Mounted Stoplamp (CHMSL) It is recommended that this component be replaced as a
unit by your dealer.

6-40Taillamps A. Turn Signal Lamp
B. Back
- Up Lamp
C. Stoplamp
1. Remove the two screws
from the rear
lamp assembly. 2. Remove the rear lamp assembly.
3. Press the release tab and turn the bulb
socket counterclockwise to remove it from the
taillamp housing.
4. Pull the bulb straight out
from the socket.
5. Press a new bulb into the socket, insert it into the
taillamp housing and turn the socket clockwise into
the taillamp housing until it clicks.
6. Reinstall the rear lamp assembly and tighten
the screws.

6-62 Instrument Panel Fuse Block
The fuse block access door
is on the driver's side edge
of the instrument panel.
Pull off the cover to access
the fuse block.
You can remove fuses with a fuse extractor which is
mounted to the fuse block access door. To remove fuses
if you don't have a fuse extractor, hold the end of the
fuse between your thumb and index finger and pull
straight out.
You may have spare fuses located behind the fuse block
access door. These can be used to replace a bad fuse.
However, make sure it is of the correct amperage. NAME Usage
HVAC 1 Climate Control System
IGN 3 Ignition, Power Seats
BRAKE Anti
- Lock Brake System
HTR A/C Climate Control System

6-63NAME Usage
IGN 0 PRND321 Display,
Odometer, VCM/PCM
CRUISE Cruise Control, Instrument Cluster
4WD Not Used
TURN Exterior Lamps, Turn Signals,
Hazard Lamps
RR WIPER Rear Window Wiper
WS WPR Windshield Wipers
SEO IGN Special Equipment
Option, Ignition
L BODY Retained Accessory Power Relay
ILLUM Interior Lamps
IGN 1 Ignition, Instrument Panel
SEO ACCY Special Equipment
Option Accessory
CRANK Starting System
AIR BAG Air Bag NAME Usage
SEAT Power Seat Circuit Breaker
MIR/LOCK Power Mirrors, Power Door Locks
DR LOCK Power Door Locks
RAP #1 Retained Accessory Power Relay
LOCK Power Door Locks
INT PRK Interior Lamps
UNLOCK Power Door Locks
DRV UNLOCK Power Door Lock Relay
L DOOR Power Door Lock Relay
PWR WDO Power Window Circuit Breaker
RDO 1 Audio System
LOCK Power Door Lock Relay
UNLOCK Power Door Lock Relay
RAP #2 Rear Power Windows,
Sunroof, Radio

6-64 Center Instrument Panel Utility Block
The center instrument panel utility block is located
underneath the instrument panel, to the left of the
steering column. Relay Name Usage
SEO Special Equipment Option
TRAILER Trailer Brake Wiring
UPF Upfitter
SPARE 2 Not Used
SPARE 3 Not Used
HTD ST Heated Seats
PWR ST Power Seats
PARK LAMP Parking Lamps
INADV PWR Interior Lamps Feed
SPARE Not Used
SPARE Not Used
*FRT PRK EXPT Not Used
PUDDLE LP Puddle Lamps
CTSY LP Courtesy Lamps
VANITY Headliner Wiring
BLANK Not Used
SL RIDE Not Used
CEL PHONE Not Used

6-65Underhood Fuse Block The underhood fuse/relay block is located near the
battery in the engine compartment. See ªEngine
Compartment Overviewº in the Index for more
information on its location. Lift the cover for access
to the fuse/relay block.
You will see fuses to the top right of the fuse/relay block
once you remove the cover. These are spare fuses and
can be used accordingly.
You can remove fuses with a fuse extractor. The fuse
extractor is located in the fuse/relay block. To remove
fuses if you don't have a fuse extractor, hold the end of
the fuse between your thumb and index finger and pull
straight out.

6-67Name Usage
STUD #1 Accessory Power/Trailer Wiring
Feed/Load Leveling
ABS Anti
- Lock Brakes
IGN A Ignition Switch
AIR A.I.R. System
RAP #1 Retained Accessory Power,
Power Mirrors, Power Door
Locks, Power Seat(s)
IGN B Ignition Switch
RAP #2 Retained Accessory Power/Rear
Power Windows, Sunroof, Radio
STUD #2 Accessory Power/Trailer Wiring
Brake Feed
TRL R TRN Right Turn Signal Trailer Wiring
TRL L TRN Left Turn Signal Trailer Wiring
IGN 1 Ignition, Fuel Controls
INJ
- B Ignition, Fuel Controls (Relay) Name Usage
STARTER Starter (Relay)
PARK LP Parking Lamps
FRT HVAC Climate Control System
STOP LP Exterior Lamps, Stoplamps
ECM 1 VCM/PCM
CHMSL Center High Mounted Stoplamp
VEH STOP Stoplamps, Cruise Control
TRL B/U Backup Lamps Trailer Wiring
INJ
- A Fuel Controls, Ignition
RR HVAC Rear Climate Control System
VEH B/U Vehicle Backup Lamps
ENG 1 Engine Controls, Canister Purge,
Fuel System
ETC Electronic Throttle Control
IGN E A/C Compressor Relay, Rear
Window Defogger, Daytime
Running Lamps, A.I.R. System

6-68 Name Usage
B/U LP Backup Lamps, Automatic
Transmission Shift Lock
Control System
ATC Automatic Transfer Case
RR DEFOG Rear Window Defogger, Heated
Mirrors (Relay)
RTD Autoride
(Real Time Damping)
RR PRK Right Rear Parking Lamps
ECM B VCM/PCM
F/PMP Fuel Pump (Relay)
O2 A Oxygen Sensors
O2 B Oxygen Sensors
LR PRK Left Rear Parking Lamps
RR DEFOG Rear Window Defogger, Heated
Mirrors
HDLP Headlamps (Relay)
TRL PRK Parking Lamps Trailer Wiring
PRIME Not Used Name Usage
RT HDLP Right Headlamps
DRL Daytime Running Lamps (Relay)
HTD MIR Heated Mirrors
LT HDLP Left Headlamps
A/C Air Conditioning
AUX PWR Cigarette Lighter, Auxiliary
Power Outlets
SEO 2 Special Equipment Option Power,
Power Seats
SEO 1 Special Equipment Option Power
DRL Daytime Running Lamps
A/C A/C (Relay)
FOG LP Fog Lamps
FOG LP Fog Lamps (Relay)
RADIO Audio System, Instrument Cluster,
Climate Control System
CIGAR Cigarette Lighter, Auxiliary
Power Outlets

6-69Name Usage
RT TURN Right Turn Signals
BTSI Automatic Transmission Shift
Lock Control System
LT TURN Left Turn Signals
FR PRK Front Parking Lamps,
Sidemarker Lamps
W/W PMP Windshield Washer Pump
HORN Horn (Relay)
IGN C Ignition Switch, Fuel Pump,
PRND321 Display, Crank
RDO AMP Radio Amplifier
HAZ LP Exterior Lamps, Hazard Lamps
EXP LPS Not Used
HORN Horn
CTSY LP Interior Lamps
RR WPR Rear Wipers
TBC Body Control Module, Remote
Keyless Entry, Headlamps Replacement Bulbs Bulb Number
Low
- Beam Headlamps 9005 or 9005LL. . . . . . . . . .
(Long Life) (Preferred)
High
- Beam Headlamps 9005. . . . . . . . . . . . . . . . . . .
Daytime Running Lamps (DRL) 3157KX or . . . . . . .
4157K (Preferred)
Front Marker Lamp 194. . . . . . . . . . . . . . . . . . . . . .
Front Parking and Turn Lamp 3157 or. . . . . . . . . . .
3157K (long life)
Rear Marker Lamp, Taillamp and
Stop Lamp 3157. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Turn Lamp 3157. . . . . . . . . . . . . . . . . . . . . . . . .
Back
- up Lamp 3157. . . . . . . . . . . . . . . . . . . . . . . . . .
For replacement bulbs not listed here, please consult
your dealer.

7-18 Weatherstrip Lubrication
Silicone grease on weatherstrips will make them
last longer, seal better, and not stick or squeak.
Apply silicone grease with a clean cloth. During very
cold, damp weather more frequent application may be
required. See ªRecommended Fluids and Lubricantsº
in the Index.
Automatic Transmission Check
Check the transmission fluid level; add if needed.
See ªAutomatic Transmission Fluidº in the Index.
A fluid loss may indicate a problem. Check the system
and repair if needed. At Least Once a Year Key Lock Cylinders Service
Lubricate the key lock cylinders with the lubricant
specified in Part D.
Body Lubrication Service
Lubricate all hood latch assembly, secondary latch, pivots,
spring anchor, release pawl, door hinges, liftgate hinge,
liftgate linkage, liftgate handle pivot points, latch bolt, fuel
door hinge, locks and folding seat hardware. Part D tells
you what to use. More frequent lubrication may be
required when exposed to a corrosive environment.