GMC Yukon XL C2500 2002 - 2002 GENERAL MOTORS Avalanche, Escalade, Escalade EXT, Sierra, Silverado, Suburban, Tahoe, Yukon & Yukon XL

GMC Yukon XL C2500 2002 - BUZZERS, RELAYS & TIMERS

GMC Yukon XL C2500 2002 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
A/C Compressor Clutch Relay	In underhood fuse block.
Auxiliary Battery Relay	At right rear of engine compartment. See Fig. 9.
Compressor/Leveling Relay	On left side of engine compartment, near underhood fuse block.
Courtesy Lamp Relay	In body relay block.
Daytime Running Lamp (DRL) Relay	In underhood fuse block.
Driver Unlock Relay	In fuse block.
Emergency Roof Lamp Relay	At left side of engine compartment, on underhood fuse block bracket.
Exterior Illumination Lamps Relay	In body relay block.
FM Impedance Matching Module	Above left rear quarter glass, in headliner.
Foglamp Relay	In underhood fuse block.
Fuel Pump (FP) Relay	In underhood fuse block.
Fuel Pump (FP) Relay (Primary) (6.6L VIN 1)	At left side of engine compartment, on underhood fuse block bracket.
Fuel Pump (FP) Relay (Secondary)	At left side of engine compartment, on underhood fuse block bracket.
Glow Plug/Intake Heater Relay Assembly (6.6L VIN 1)	On left side of engine, above valve cover.
Headlamp Relay	In underhood fuse block.
Heated Seat Relay (Driver)	Under driver's seat.
Heated Seat Relay (Passenger)	Under front passenger's seat.
Horn Relay	In underhood fuse block.
IGN 1 Relay	In underhood fuse block.
Inadvertent Power Relay	In body relay block.
Intake Air Heater (IAH) Relay (6.6L VIN 1)	At rear of engine, integral to glow plug/intake heater relay assembly.
Lock Relay	In left I/P fuse block.
Park Lamp Relay	In body relay block.
Power Take-Off (PTO) Relay	At left side of engine compartment, on underhood fuse block bracket.
RAP 1 Relay	In left I/P fuse block.
RAP 2 Relay	In right I/P fuse block.
Rear Window Defogger Relay	In underhood fuse block.
Roof Beacon Relay	At lower left "B" pillar.
Secondary Air Injection (AIR) Relay	In right rear of engine compartment.
Starter Relay	In underhood fuse block.
Unlock Relay	In left I/P fuse block.

GMC Yukon XL C2500 2002 - CIRCUIT PROTECTION DEVICES

GMC Yukon XL C2500 2002 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Battery Cable Junction Block	At right front of engine compartment.
Body Relay Block	Under left side of dash, near kick panel.
Left I/P Fuse Block	On lower left side of dash.
Rear Lamps Junction Block	Forward of rear bumper, on crossmember.
Right I/P Fuse Block	On lower right side of dash.
Underhood Fuse Block	At left side of engine compartment, near battery.

GMC Yukon XL C2500 2002 - CONTROL UNITS

GMC Yukon XL C2500 2002 CONTROL UNITS LOCATION

Component	Location
Blower Motor Control Processor (Pickup)	Behind right side of dash, on HVAC assembly.
Blower Motor Control Processor (Utility)	Behind dash, below radio.
Body Control Module (BCM)	On lower left side of dash, below steering column.
Compressor/Leveling Module (RTD)	At rear of vehicle, on crossmember frame rail.
Courtesy Lamp Module (Utility)	Behind headlight switch, taped to harness.
Cruise Control Module	In left rear of engine compartment, on firewall.
Electronic Brake Control Module (EBCM)	On left side of the inner frame.
Engine Control Module (ECM) (6.6L VIN 1)	At left front of engine compartment.
Fuel Injector Control Module (6.6L VIN 1)	Under engine air intake duct.
HVAC Control Module	Behind center of dash.
Ignition Control Module (ICM) (4.3L VIN W)	At right rear of engine, near ground strap.
Inflatable Restraint Sensing/Diagnostic Module (SDM)	Under driver's seat.
Memory Seat Module (MSM)	Underside of driver's seat.
Powertrain Control Module (PCM) (4.3L VIN W)	On left front of engine compartment.
Powertrain Control Module (PCM) (4.8L VIN V)	On left front of engine compartment. See Fig. 10.
Powertrain Control Module (PCM) (5.3L VIN T)	On left front of engine compartment. See Fig. 10.
Powertrain Control Module (PCM) (6.0L VIN U)	On left front of engine compartment. See Fig. 10.
Powertrain Control Module (PCM) (8.1L VIN G)	On left front of engine compartment. See Fig. 10.
Radio Antenna Module	Above right rear quarter glass, in headliner.
Rear Object Sensor Control Module (Avalanche)	Under left rear seat.
Rear Object Sensor Control Module (Escalade/Denali)	Under right rear seat.
Rear Wheel Steering Control Module	At left rear of vehicle, near spare tire bracket.
Remote Control Door Lock Receiver (RCDLR)	Behind top center of dash.
Sun Roof Module	At rear of sun roof.
Suspension Control Module (Avalanche)	Behind driver's seat, under left rear seat.
Suspension Control Module (Escalade/Denali)	At right rear wheelwell.
Throttle Actuator Control (TAC) Module	In left rear of engine compartment, near underhood fuse block.
Transfer Case Shift Control Module	Behind headlamp switch.
Transmission Control Module (TCM)	At left front of engine compartment.
Vehicle Communication Unit (VCU)	Behind left side of dash.
Vehicle Interface Unit (VIU)	Behind right side of dash.

GMC Yukon XL C2500 2002 - MOTORS

GMC Yukon XL C2500 2002 MOTORS LOCATION

Component	Location
Air Temperature Actuator	At bottom center of HVAC control assembly.
Air Temperature Actuator (Auxiliary)	At bottom center of HVAC control assembly-rear auxiliary.
Blower Motor	Under right side of dash.
Blower Motor (Auxiliary)	Above right rear wheelwell.
Front Axle Actuator	On right side of center, on axle housing.
Fuel Pump (6.6L VIN 1)	Left side frame rail.
Fuel Pump & Sender Assembly (Primary) (Gas Engines)	In fuel tank.
Fuel Pump & Sender Assembly (Secondary) (Gas Engines)	In fuel tank.
Fuel Transfer Pump (6.6L VIN 1)	In rear fuel tank.
Idle Air Control (IAC) Motor (4.3L VIN W)	On throttle body. See Fig. 1.
Mode Actuator	On left side of the HVAC module.
Mode Actuator (Auxiliary)	On left side of the HVAC module-rear auxiliary.
Recirculation Actuator	On top center of the HVAC module.
Secondary Air Injection (AIR) Pump	On right rear of engine compartment.
Steering Gear Motor Assembly	At rear of vehicle, near spare tire bracket.
Transfer Case Encoder Motor	On front left side of transfer case.
Window/Wiper Module (Rear)	In rear liftgate.
Windshield Washer Pump	In washer fluid reservoir.
Windshield Washer Pump (Rear)	In washer fluid reservoir.
Windshield Wiper Motor Module	On firewall.

GMC Yukon XL C2500 2002 - SENDING UNITS & SENSORS

GMC Yukon XL C2500 2002 SENDING UNITS & SENSORS LOCATION

Component	Location
Accelerator Pedal Position (APP) Sensor	Behind accelerator pedal.
Air Temperature Sensor Assembly (Inside)	In headliner, above driver.
Air Temperature Sensor (Lower)	In lower left floor duct assembly.
Air Temperature Sensor (Lower Auxiliary)	At bottom center of HVAC assembly-rear auxiliary.
Air Temperature Sensor (Outside) (Mirror)	In left front bumper filler assembly.
Air Temperature Sensor (Outside) (W/ Auto A/C)	In right front bumper filler assembly.
Air Temperature Sensor (Upper)	Below radio, in upper duct.
Air Temperature Sensor (Upper Auxiliary)	In rear auxiliary HVAC upper duct, near "C" pillar.
Ambient Air Temperature Sensor (HVAC)	In right front bumper filler assembly.
Ambient Air Temperature Sensor (Mirror)	In left front bumper filler assembly.
Ambient Light Sensor	On top center of dash.
Barometric Pressure (BARO) Sensor (6.6L VIN 1)	On left side of engine.
Boost Sensor (6.6L VIN 1)	On right side of engine, on intake manifold.
Camshaft Position (CMP) Sensor (4.3L VIN W)	In distributor.
Camshaft Position (CMP) Sensor (4.8L VIN V)	On top center rear of engine.
Camshaft Position (CMP) Sensor (5.3L VIN T)	On top center rear of engine.
Camshaft Position (CMP) Sensor (6.0L VIN U)	On top center rear of engine.
Camshaft Position (CMP) Sensor (6.6L VIN 1)	On front of engine, near cooling fan pulley.
Camshaft Position (CMP) Sensor (8.1L VIN G)	On left side of timing cover.
Crankshaft Position (CKP) Sensor (4.3L VIN W)	On bottom front of engine, near crank pulley. See Fig. 2.
Crankshaft Position (CKP) Sensor (4.8L VIN V)	On lower right rear of engine block. See Fig. 7.
Crankshaft Position (CKP) Sensor (5.3L VIN T)	On lower right rear of engine block. See Fig. 7.
Crankshaft Position (CKP) Sensor (6.0L VIN U)	On lower right rear of engine block. See Fig. 7.
Crankshaft Position (CKP) Sensor (6.6L VIN 1)	On right side of engine front cover.
Crankshaft Position (CKP) Sensor (8.1L VIN G)	On top left rear of engine block, near bell housing. See Fig. 8.
Engine Coolant Temperature (ECT) Sensor (4.3L VIN W)	On rear side of left cylinder head. See Fig. 3.
Engine Coolant Temperature (ECT) Sensor (4.8L VIN V)	On front side of left cylinder head. See Fig. 5.
Engine Coolant Temperature (ECT) Sensor (5.3L VIN T)	On front side of left cylinder head. See Fig. 5.
Engine Coolant Temperature (ECT) Sensor (6.0L VIN U)	On front side of left cylinder head. See Fig. 5.
Engine Coolant Temperature (ECT) Sensor (6.6L VIN 1)	On top front of engine.
Engine Coolant Temperature (ECT) Sensor (8.1L VIN G)	At middle of right cylinder head.
Engine Oil Pressure (EOP) Sensor (4.8L VIN V)	On top rear of engine.
Engine Oil Pressure (EOP) Sensor (5.3L VIN T)	On top rear of engine.
Engine Oil Pressure (EOP) Sensor (6.0L VIN U)	On top rear of engine.
Engine Oil Pressure (EOP) Sensor (6.6L VIN 1)	On top rear of engine.
Engine Oil Pressure (EOP) Sensor (8.1L VIN G)	On top rear of engine. See Fig. 8.
Front Propshaft Speed Sensor	On left side of transfer case, at shaft output.
Fuel Rail Temperature Sensor (6.6L VIN 1)	Under intake manifold shield, on fuel rail.
Fuel Pump & Sender Assembly (Primary)	In fuel tank.
Fuel Pump & Sender Assembly (Secondary)	In fuel tank.
Fuel Tank Pressure (FTP) Sensor	On fuel tank, integral to fuel pump & sender assembly.
Handwheel Position Sensor	In steering column.
Heated Oxygen Sensor (HO2S) (Bank 1 Sensor 1)	In left exhaust pipe, before catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 1 Sensor 2)	In left exhaust pipe, after catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 2 Sensor 1)	In right exhaust pipe, before catalytic converter.
Heated Oxygen Sensor (HO2S) (Bank 2 Sensor 2)	In right exhaust pipe, after catalytic converter.
Inflatable Restraint Electronic Frontal Sensor (EFS)	On underside of radiator support.
Inflatable Restraint Front End Discriminating Sensor	On underside of radiator support.
Inflatable Restraint Side Impact Sensor (SIS) (Left)	In lower left door.
Inflatable Restraint Side Impact Sensor (SIS) (Right)	In lower right door.
Intake Air Temperature (IAT)/Mass Airflow (MAF) Sensor	In air induction tube. See Fig. 9.
Knock Sensor (KS) (4.3L VIN W)	On rear of engine block. See Fig. 1.
Knock Sensors (KS) (4.8L VIN V)	In the valley, under the intake manifold. See Fig. 6.
Knock Sensors (KS) (5.3L VIN T)	In the valley, under the intake manifold. See Fig. 6.
Knock Sensors (KS) (6.0L VIN U)	In the valley, under the intake manifold. See Fig. 6.
Knock Sensor (KS) Bank 1 (8.1L VIN G)	On left side of engine, forward of oil filter.
Knock Sensor (KS) Bank 2 (8.1L VIN G)	On right side of engine, forward of starter.
Manifold Absolute Pressure (MAP) Sensor (4.3L VIN W)	On top rear of engine, on intake manifold. See Fig. 4.
Manifold Absolute Pressure (MAP) Sensor (4.8L VIN V)	On top rear of engine, on intake manifold. See Fig. 5.
Manifold Absolute Pressure (MAP) Sensor (5.3L VIN T)	On top rear of engine, on intake manifold. See Fig. 5.
Manifold Absolute Pressure (MAP) Sensor (6.0L VIN U)	On top rear of engine, on intake manifold. See Fig. 5.
Manifold Absolute Pressure (MAP) Sensor (8.1L VIN G)	On top rear of engine, on intake manifold.
Rear Position Sensor	At left rear of vehicle, near steering gear.
Rear Propshaft Speed Sensor	In transfer case extension housing.
Steering Wheel Speed/Position Sensor	Near base of steering column.
Sunload Sensor	On center of dash, near defrost deflectors.
Throttle Position (TP) Sensor (Dual Track)	On throttle body assembly.
Throttle Position (TP) Sensor (4.3L VIN W)	On throttle body assembly. See Fig. 1.
Throttle Position (TP) Sensor (4.8L VIN V)	On throttle body assembly. See Fig. 5.
Throttle Position (TP) Sensor (5.3L VIN T)	On throttle body assembly. See Fig. 5.
Throttle Position (TP) Sensor (6.0L VIN U)	On throttle body assembly. See Fig. 5.
Throttle Position (TP) Sensor (8.1L VIN G)	On throttle body assembly.
Vehicle Speed Sensor (2WD)	On left rear side of transmission.
Vehicle Speed Sensor (4WD)	On left side of transfer case.
Washer Fluid Level Sensor	In washer fluid reservoir.
Water In Fuel Sensor (6.6L VIN 1)	On fuel filter element.
Wheel Speed Sensor (WSS) (Left Front)	On left front wheel hub assembly.
Wheel Speed Sensor (WSS) (Right Front)	On right front wheel hub assembly.
Yaw/Rate Sensor	Under passenger's seat.
Yaw & Lateral Acceleration Sensor (806)	Under floor console, below cupholders.
Yaw & Lateral Acceleration Sensor (820C)	Under passenger's seat.

GMC Yukon XL C2500 2002 - SOLENOIDS & SOLENOID VALVES

GMC Yukon XL C2500 2002 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
A/T Shift Lock Control Solenoid	On lower part of steering column.
Electronic Variable Orifice (EVO) Solenoid	On power steering pump fluid fittings.
Evaporative Emissions (EVAP) Canister Purge Solenoid (4.3L VIN W)	On top right rear of engine. See Fig. 1.
Evaporative Emissions (EVAP) Canister Purge Solenoid (4.8L VIN V)	On top right rear of engine. See Fig. 5.
Evaporative Emissions (EVAP) Canister Purge Solenoid (5.3L VIN T)	On top right rear of engine. See Fig. 5.
Evaporative Emissions (EVAP) Canister Purge Solenoid (6.0L VIN U)	On top right rear of engine. See Fig. 5.
Evaporative Emissions (EVAP) Canister Purge Solenoid (8.1L VIN G)	On top right rear of engine.
Evaporative Emissions (EVAP) Canister Vent Solenoid	On right front side of fuel tank.
Exhaust Gas Recirculation (EGR) Valve (4.8L VIN V)	On top right front of engine.
Exhaust Gas Recirculation (EGR) Valve (5.3L VIN T)	On top right front of engine.
Exhaust Gas Recirculation (EGR) Valve (6.0L VIN U)	On top right front of engine.
Exhaust Gas Recirculation (EGR) Valve (8.1L VIN G)	On top rear center of engine. See Fig. 8.
Idle Air Control (IAC) Valve (4.8L VIN V)	Attached to top of throttle body. See Fig. 5.
Idle Air Control (IAC) Valve (5.3L VIN T)	Attached to top of throttle body. See Fig. 5.
Idle Air Control (IAC) Valve (6.0L VIN U)	Attached to top of throttle body. See Fig. 5.
Secondary Air Injection Reaction Pump Shutoff Valve	On right rear of engine compartment.
Secondary Air Injection (AIR) Solenoid	On right rear of engine compartment.

GMC Yukon XL C2500 2002 - SWITCHES

GMC Yukon XL C2500 2002 SWITCHES LOCATION

Component	Location
A/C High Pressure Switch	On rear of A/C compressor.
A/C Low Pressure Switch	On right side of accumulator. See Fig. 9.
Back-Up Lamp Switch	On left side of transmission.
Brake Fluid Level Switch	On left side of brake fluid reservoir.
Clutch Start Switch	On top of clutch pedal assembly, near reservoir.
Coolant Level Switch	In coolant reservoir.
Engine Oil Level Switch (4.3L VIN W)	On right side of oil pan.
Engine Oil Level Switch (4.8L VIN V)	On right side of oil pan.
Engine Oil Level Switch (5.3L VIN T)	On right side of oil pan.
Engine Oil Level Switch (6.0L VIN U)	On right side of oil pan.
Engine Oil Level Switch (6.6L VIN 1)	On left rear of oil pan.
Engine Oil Level Switch (8.1L VIN G)	On right side of oil pan.
Engine Oil Pressure (EOP) Switch (4.3L VIN W)	On top left rear of engine, near distributor. See Fig. 1.
Headlamp Dimmer Switch	In steering column, integral to multifunction switch.
MPA Switch	On electronic brake control module.
Park Brake Switch	Part of the park brake assembly.
Park/Neutral Position (PNP) Switch	On left side of transmission.
Park Switch	In steering column.
Seat Belt Switch	On driver's seat belt buckle.
Stoplamp Switch	On top of brake pedal bracket.
Transfer Case Shift Control Switch	On left front of transfer case.

GMC Yukon XL C2500 2002 - MISCELLANEOUS

GMC Yukon XL C2500 2002 MISCELLANEOUS LOCATION

Component	Location
Audio Amplifier (Bose) (Avalanche)	In center floor console.
Audio Amplifier (Bose) (Suburban/Utility)	Above left rear wheelwell.
Audio Amplifier	At right side of dash, behind glove box.
Back-Up Alarm	At rear bumper.
Blower Motor Resistor Assembly	On HVAC module, near blower motor.
Blower Motor Resistor Assembly (Auxiliary)	Above right rear wheelwell.
Data Link Connector (DLC)	Under left side of dash, below steering column.
Fuel Heater (6.6L VIN 1)	On top of fuel filter element.
Fuel Rail Pressure Regulator (6.6L VIN 1)	At front of engine, integral to injection pump.
Global Positioning Satellite (GPS) Antenna	On left side of rear window.
Ignition Coil (4.3L VIN W)	On top right rear of engine. See Fig. 1.
Ignition Coils (4.8L VIN V)	On top of left and right valve covers.
Ignition Coils (5.3L VIN T)	On top of left and right valve covers.
Ignition Coils (6.0L VIN U)	On top of left and right valve covers.
Ignition Coils (8.1L VIN G)	On top of left and right valve covers.
Intake Air Heater (IAH) (6.6L VIN 1)	Under intake manifold sight shield, inside air intake pipe.
Pressure Transducer (ABS W/ VSES)	On electronic brake control module.
Rear Parking Assist Diagnostic Connector (Avalanche)	Under left rear seat.
Rear Parking Assist Diagnostic Connector (Escalade/Denali)	Under right rear seat.

GMC Yukon XL C2500 2002 - CONNECTORS

GMC Yukon XL C2500 2002 CONNECTORS LOCATION

Component	Location
C100 (Black, 16 Pin)	Under fuse block.
C102 (Black, 8 Pin)	Under fuse block.
C103 (Black, 6 Pin)	Attached to front side of fuse block.
C104 (Gray, 10 Pin)	Front side of fuse block.
C105	Near fuse block.
C106 (W/O PTO)	Near transmission control module.
C106 (W/PTO)	Near PCM/ECM.
C107	On top of valve cover.
C108	On top of valve cover.
C109	Near transmission.
C111	At right side post catalytic converter oxygen sensor jumper.
C115	At left rear of engine compartment.
C116	Attached to fuse block.
C117 (Black, 1 Pin)	Near fuse block.
C118 (Black, 2 Pin)	Attached to fuse block.
C125 (Light Gray, 8 Pin)	On radiator support.
C127 (Light Gray, 7 Pin)	On radiator support.
C148 (Light Gray, 8 Pin)	On top left side of engine.
C149 (Light Gray, 8 Pin)	On top right side of engine.
C150 (Black, 4 Pin)	On left inner fender.
C151 (Black, 12 Pin)	On left inner fender.
C152 (Blue, 12 Pin)	On left inner fender.
C153 (Black, 3 Pin)	On left inner fender.
C154 (Black, 6 Pin)	On left inner fender.
C155 (Black, 10 Pin)	Near left top front of engine.
C198 (Black, 1 Pin)	On left inner fender.
C199 (Black, 1 Pin)	Near trailer in-line connector.
C200 (Light Gray, 22 Pin)	At left kick panel.
C201 (Black, 17 Pin)	On steering column.
C202 (Black, 8 Pin)	On left side of dash.
C204 (Black, 6 Pin)	Near left front kick panel.
C205 (Black, 10 Pin)	To left of dash.
C206 (Black, 6 Pin)	To right of dash.
C207 (Black, 12 Pin)	To right of dash.
C208 (Medium Gray, 22 Pin)	To right of dash.
C209 (Black, 16 Pin)	Near kick panel.
C210 (Black, 2 Pin)	Near kick panel.
C211 (Black, 2 Pin)	To right of dash.
C212 (Black, 30 Pin)	Behind radio.
C213	Near right side kick panel.
C214	In left side of headliner.
C215	In left side of headliner.
C216 (Black, 4 Pin)	Inside steering wheel assembly.
C217 (Black, 4 Pin)	Inside steering wheel assembly.
C218 (Black, 9 Pin)	Near remote CD Player.
C248 (Black, 12 Pin)	On top left side of dash.
C249 (Black, 3 Pin)	Under front floor console.
C250	Near radio.
C251 (Gray, 6 Pin)	In right side dash.
C252 (Black, 8 Pin)	On left side of dash.
C253 (Black, 10 Pin)	Near radio.
C290 (Black, 10 Pin)	To right of dash.
C293	Near left front door.
C296 (Black, 8 Pin)	Behind glove compartment.
C297	On lower right side of dash.
C298 (Black, 6 Pin)	At right side of dash.
C299 (Light Gray, 22 Pin)	At right side of dash.
C301	Under left front seat.
C302	At left "A" pillar.
C303 (Black, 6 Pin)	Under right seat.
C304	Near right front kick panel.
C305 (Black, 12 Pin)	Under left front seat.
C306 (Light Gray, 40 Pin)	Under front floor console.
C307 (Black, 16 Pin)	Under floor console.
C310 (Black, 7 Pin)	Near left rear door.
C312 (Blue, 8 Pin)	In right rear of vehicle.
C314 (Black, 30 Pin)	Under middle of dash.
C315 (Black, 3 Pin)	Near right front kick panel.
C320 (Black, 3 Pin)	Under driver's memory seat.
C321 (Black, 20 Pin)	Under driver's memory seat.
C322 (Natural, 10 Pin)	Under driver's memory seat.
C323 (Black, 6 Pin)	Under driver's memory seat.
C324 (Black, 4 Pin)	Under driver's seat.
C325 (Black, 3 Pin)	Under driver's seat.
C326 (Black, 3 Pin)	Under passenger's seat.
C330 (Black, 38 Pin)	On left frame rail.
C340 (Black, 40 Pin)	Under front floor console.
C341 (Light Gray, 22 Pin)	Under front floor console.
C349 (Natural, 4 Pin)	Under front passenger's seat.
C350 (Black, 18 Pin)	Inside right rear of vehicle.
C351 (Black, 2 Pin)	Under floor console.
C353 (Black, 8 Pin)	Under front headliner.
C354	Under driver's seat.
C355 (Black, 3 Pin)	In front center of headliner.
C386 (Black, 6 Pin)	Under right rear seat.
C387 (Black, 4 Pin)	Under passenger.
C388 (Black, 6 Pin)	Under passenger's seat.
C395 (Black, 3 Pin)	Near "D" pillar.
C396 (Black, 7 Pin)	Near right rear door.
C397 (Black, 6 Pin)	In right rear of vehicle.
C398 (Black, 2 Pin)	Under passenger's seat.
C399 (Black, 6 Pin)	Under passenger's seat.
C402 (Medium Gray, 7 Pin)	Near frame rail.
C403 (Gray, 7 Pin)	Near frame rail.
C404 (Gray, 4 Pin)	Near frame rail.
C405 (Blue, 8 Pin)	Near frame rail.
C406 (Black, 6 Pin)	At right rear of vehicle.
C450 (Black, 38 Pin)	Near spare tire.
C495 (Natural, 4 Pin)	At left "C" pillar.
C497 (Black, 6 Pin)	Near subwoofer speaker.
C498 (Black, 8 Pin)	Near subwoofer speaker.
C900 (Black, 3 Pin)	In rear liftgate.
C901 (Black, 8 Pin)	In rear liftgate.
C950	Near left rear wheelwell.
C951	Near right rear wheelwell.

GMC Yukon XL C2500 2002 - GROUNDS

GMC Yukon XL C2500 2002 GROUNDS LOCATION

Component	Location
G100	On left front body mount.
G102 (4.3L VIN W)	On lower right front of engine block.
G102 (4.8L VIN V)	On left side of engine block. See Fig. 5.
G102 (5.3L VIN T)	On left side of engine block. See Fig. 5.
G102 (6.0L VIN U)	On left side of engine block. See Fig. 5.
G102 (6.6L VIN 1)	On left side of engine block.
G102 (8.1L VIN G)	On left side of engine block.
G103 (4.3L VIN W)	On right rear of engine block. See Fig. 1.
G103 (4.8L VIN V)	On right rear of engine block.
G103 (5.3L VIN T)	On right rear of engine block.
G103 (6.0L VIN U)	On right rear of engine block.
G103 (6.6L VIN 1)	On right rear of engine block.
G103 (8.1L VIN G)	On right rear of engine block.
G104 (4.3L VIN W)	On left rear of engine block. See Fig. 1.
G104 (4.8L VIN V)	On left rear of engine block.
G104 (5.3L VIN T)	On left rear of engine block.
G104 (6.0L VIN U)	On left rear of engine block.
G104 (6.6L VIN 1)	On left rear of engine block.
G104 (8.1L VIN G)	On left rear of engine block.
G105	On lower right front of engine block.
G106	On right front of engine block.
G107	Engine ground strap.
G110	On left front body mount.
G200	On right "A" pillar.
G203	On left "A" pillar.
G302	On left body mount.
G304	Under driver's seat.
G305	On left "B" pillar.
G306	On right "B" pillar.
G401	On spare tire hoist bracket.
G403	On left frame body mount bracket.
G410	On right rear inner side body panel.

GMC Yukon XL C2500 2002 - SPLICES

GMC Yukon XL C2500 2002 SPLICES LOCATION

Component	Location
S100	In forward lamp harness.
S101	In forward lamp harness.
S102	In engine harness.
S103	In engine harness.
S104	In engine harness.
S108	In engine harness.
S110	In engine harness.
S112	In chassis harness.
S113	In engine harness.
S114A	In engine harness.
S115	In engine harness.
S116	In engine harness.
S117	In engine harness.
S118	In engine harness.
S119	In engine harness.
S120	In engine harness.
S121	Alternate fuel.
S122	Alternate fuel.
S123	Alternate fuel.
S124	Alternate fuel.
S125	Alternate fuel.
S126	Alternate fuel.
S127	Alternate fuel.
S128	Alternate fuel.
S130	Alternate fuel.
S131	Alternate fuel.
S132	Alternate fuel.
S133	Alternate fuel.
S134	Alternate fuel.
S135	Alternate fuel.
S136	Alternate fuel.
S137	Alternate fuel.
S138	Alternate fuel.
S139	Alternate fuel.
S140	Alternate fuel.
S141	Alternate fuel.
S142	Alternate fuel.
S143	Alternate fuel.
S144	Alternate fuel.
S145	In I/P harness.
S146	Alternate fuel.
S147	In I/P harness.
S148	In engine harness.
S149	In engine harness.
S150	In engine harness.
S151	In engine harness.
S152	In engine harness.
S153	In engine harness.
S154	In engine harness.
S155	In engine harness.
S156	In engine harness.
S157	In engine harness.
S158	In engine harness.
S159	In engine harness.
S160	In engine harness.
S161	I/P harness.
S162	Power take-off switch.
S163	PTO relay/switch.
S164	In engine harness.
S165	In engine harness.
S166	In fuel injector harness.
S167	In fuel injector harness.
S168	In fuel injector harness.
S169	In fuel injector harness.
S170	Fuel injector module grounds.
S171	Fuel injector module grounds.
S172	Battery feed to controller-Isuzu.
S173	Ignition circuit to glow plug controller-Isuzu.
S174	Intake heater relay-Isuzu.
S175	Intake heater relay-Isuzu.
S176	In Isuzu engine harness.
S177	In Isuzu engine harness.
S178	In Isuzu engine harness.
S179	In Isuzu engine harness.
S197	In battery positive cable.
S198	In engine harness.
S199	In engine harness.
S200	At roof marker lights.
S201	At roof marker lights.
S202	In chassis harness.
S234	In steering column harness.
S235	In console harness.
S236	In console harness.
S237	In console harness.
S238	In console harness.
S239	In console harness.
S240	In console harness.
S241	In console harness.
S267	In console harness.
S268	In console harness.
S272	In console harness.
S290	In right front door harness.
S300	In console harness.
S301	In console harness.
S305	In headliner harness.
S306	In console harness.
S307	In seat harness.
S308	In seat harness.
S309	In seat harness.
S310	In seat harness.
S311	In seat harness.
S312	In engine harness.
S313	In chassis harness.
S314	In memory seat harness.
S315	In memory seat harness.
S316	In memory seat harness.
S317	In right body harness.
S400	In camper wiring harness.
S401	In camper wiring harness.
S402	In camper wiring harness.
S403	In camper wiring harness.
S404	In camper wiring harness.
S405	In camper wiring harness.
S406	In camper wiring harness.
S410	In right body harness.
S411	In liftgate harness.
S412	In rear lamp harness.
S413	In rear lamp harness.
S414	In rear lamp harness.
S415	In rear lamp harness.
S418	In rear lamp harness.
S420	In headliner harness.
S421	In headliner harness.
S422	In headliner harness.
S423	In license lamp harness.
S424	In license lamp harness.
S903	Taillamp jumper harness.
S904	Taillamp jumper harness.
S905	Taillamp jumper harness.
S906	Taillamp jumper harness.
S907	Taillamp jumper harness.
S950	In chassis harness.
SP203	On left "A" pillar.
SP205	Behind headlamp switch.