2002 GMC YUKON XL DENALI turn signal

6-38
A. Low-Beam Headlamp
B. High
-Beam Headlamp
1. Pull the headlamp assembly out.
2. Unplug the electrical connector.
3. Turn the bulb counterclockwise and remove it from
the headlamp assembly.
4. Put the new bulb into the headlamp assembly and
turn it clockwise until it is tight. Use care not to
touch the bulb with your fingers or hands.
5. Plug in the electrical connector.
6. Put the headlamp assembly back into the vehicle.
7. Install and turn the two pins into the locking feature.
Front Turn Signal, Sidemarker and
Daytime Running Lamps
A. Sidemarker Lamp
B. Retainer Clip
C. Front Turn Signal Lamp
D. Daytime Running Lamp

6-39
1. 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.

6-40 Taillamps
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.

6-63
NAME 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 BagNAME 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

6-67
Name 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

6-69
Name 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, HeadlampsReplacement 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.