GMC Yukon XL C1500 2005 - 2005 GENERAL MOTORS Avalanche, Escalade, Escalade ESV, Escalade EXT, Suburban, Tahoe,Yukon & Yukon XL

GMC Yukon XL C1500 2005 - BUZZERS, RELAYS & TIMERS

GMC Yukon XL C1500 2005 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
A/C COMP Relay	In underhood fuse block. See Fig. 29.
Automatic Level Control Compressor Relay	Near underhood fuse block. See Fig. 54.
Auxiliary Battery Relay	Right rear of engine compartment. See Fig. 33.
Auxiliary Battery Relay Electrical Connector	Right rear of engine compartment. See Fig. 33.
DEFOG Relay	In body relay block. See Fig. 32.
DRIVER UNLOCK Relay	In left I/P fuse block.
DRL Relay	In underhood fuse block. See Fig. 29.
Electronic Adjustable Pedals Relay	Behind lower left of dash.
FOG LP Relay	In underhood fuse block. See Fig. 29.
Fuel Pump (F/PMP) Relay	In underhood fuse block. See Fig. 29.
Fuel Pump Relay (Secondary) (W/Dual Tanks)	At left side of engine compartment, on underhood fuse block bracket.
HDLP-HI Relay	In underhood fuse block. See Fig. 29.
HDLP-LOW Relay	In underhood fuse block. See Fig. 29.
HORN Relay	In underhood fuse block. See Fig. 29.
IGN 1 Relay	In underhood fuse block. See Fig. 29.
LOCK Relay	In left I/P fuse block. See Fig. 30.
PARK LP Relay	In underhood fuse block. See Fig. 29.
Power Take-Off (PTO) Relay	Behind underhood fuse block. See Fig. 120.
PRIME F/PMP Relay	In underhood fuse block.
Roof Beacon Relay	At lower left "B" pillar. See Fig. 23.
RR FOG LP Relay	In left I/P fuse block. See Fig. 30.
STARTER Relay	In underhood fuse block. See Fig. 29.
Sun Roof Relay	At lower side of right "A" pillar. See Fig. 113.
UNLOCK Relay	In left I/P fuse block. See Fig. 30.
W/S WASH Relay	In underhood fuse block. See Fig. 29.

GMC Yukon XL C1500 2005 - CIRCUIT PROTECTION DEVICES

GMC Yukon XL C1500 2005 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Body Relay Block	Under left side of dash, near kick panel. See Fig. 102.
Fuse Block - I/P	Behind lower left side of dash.
Junction Block - I/P	At right side of dash, behind access panel.
Rear Lamps Junction Block	On rear inner side of right frame rail.
Right I/P Fuse Block	On lower right side of dash. See Fig. 14.
Underhood Fuse Block	At left side of engine compartment, near battery. See Fig. 3.

GMC Yukon XL C1500 2005 - CONTROL UNITS

GMC Yukon XL C1500 2005 CONTROL UNITS LOCATION

Component	Location
Blower Motor Control Processor	Behind right side of dash. See Fig. 39.
Blower Motor Control Processor (Auxiliary) (Suburban & Yukon XL)	Below auxiliary blower motor. See Fig. 47.
Blower Motor Control Processor (Auxiliary) (Tahoe & Yukon)	Below auxiliary blower motor. See Fig. 48.
Body Control Module	On lower left side of dash, below steering column. See Fig. 98.
Body Control Module (BCM) Connector	Below left side of dash. See Fig. 17.
Cruise Control Module (CCM)	Left rear of engine compartment. See Fig. 9.
Cruise Control Module (CCM) Electrical Connector	Left rear of engine compartment. See Fig. 9.
Driver Door Module (DDM)	In driver's door. See Fig. 103.
Electronic Brake Control Module Connectors (EBCM)	On electronic brake control module. See Fig. 66.
Electronic Brake Control Module (EBCM)	On left rear frame rail. See Fig. 20.
Electronic Suspension Control Module Connector (Escalade EXT)	On electronic suspension control module. See Fig. 57.
Electronic Suspension Control Module Connector (Except Avalanche & Escalade EXT)	On electronic suspension control module. See Fig. 60.
Electronic Suspension Control Module (Escalade EXT)	Below left rear seat. See Fig. 57.
Electronic Suspension Control Module (Suburban & Yukon XL)	Below rear HVAC blower motor. See Fig. 47.
Flasher Module	Bottom of left I/P fuse block. See Fig. 31.
FM Impedance Matching Module	In right rear quarter glass. See Fig. 119.
Front Passenger Door Module (FPDM)	In right front door. See Fig. 104.
Heated Seat Module (Left Rear)	Under left rear seat.
Heated Seat Module (Right Rear)	Under right rear seat.
HVAC Control Assembly (Rear Auxiliary Connector)	Center of headliner. See Fig. 40.
HVAC Control Module	Behind center of dash. See Fig. 37.
HVAC Control Module (Auxiliary)	Right rear of vehicle. See Fig. 47.
HVAC Control Processor (Auxiliary)	Center of headliner. See Fig. 40.
HVAC Module Assembly	Below instrument panel. See Fig. 38.
HVAC Module Assembly (Auxiliary)	Right rear passenger compartment. See Fig. 41.
HVAC Module (Auxiliary)	Right rear passenger compartment. See Fig. 25.
Inflatable Restraint Passenger Presence System (PPS) Module	Below right front seat. See Fig. 92.
Inflatable Restraint Sensing & Diagnostic Module (SDM)	Under left front seat. See Fig. 91.
Memory Seat Module	Below driver's seat. See Fig. 114.
Powertrain Control Module (PCM)	Left front of engine compartment. See Fig. 85.
Powertrain Control Module (PCM) Connectors	Left front of engine compartment. See Fig. 85.
Radio Antenna Module	Above right rear quarter glass, in headliner. See Fig. 119.
Rear Object Sensor Control Module Connector (Escalade EXT)	On rear object sensor control module. See Fig. 57.
Rear Object Sensor Control Module (Escalade EXT)	Under 2nd row seat. See Fig. 57.
Rear Wheel Steering Control Module	Below vehicle, between spare tire & rear bumper. See Fig. 51.
Rear Window Wiper Module	In liftgate, below rear glass. See Fig. 99.
Sun Roof Module	Above front of headliner.
Theft Deterrent Control Module	On ignition switch. See Fig. 97.
Throttle Actuator Control (TAC) Module	Left rear of engine compartment. See Fig. 81.
Throttle Actuator Control (TAC) Module Connector	Left rear of engine compartment. See Fig. 81.
Transfer Case Shift Control Module	Left side of I/P area, behind knee bolster, above parking brake assembly.
Vehicle Communication Interface Module	Behind right side of dash.
Windshield Wiper Motor Module	Left side of cowl. See Fig. 9.
Windshield Wiper Motor Module Connector	Left side of cowl. See Fig. 9.

GMC Yukon XL C1500 2005 - MOTORS

GMC Yukon XL C1500 2005 MOTORS LOCATION

Component	Location
Air Temperature Actuator	At bottom of HVAC module. See Fig. 15.
Air Temperature Actuator (Auxiliary) (Suburban & Yukon XL)	On auxiliary HVAC module assembly. See Fig. 47.
Air Temperature Actuator (Auxiliary) (Tahoe & Yukon)	On auxiliary HVAC module assembly. See Fig. 48.
Air Temperature Actuator Connector	On bottom of HVAC module. See Fig. 15.
Air Temperature Actuator (Left)	On bottom of HVAC module. See Fig. 39.
Air Temperature Actuator (Right)	Behind dash, at top of HVAC module. See Fig. 38.
A/T Shift Lock Control Actuator	On steering column. See Fig. 86.
Automatic Level Control (ALC) Air Compressor	At rear crossmember. See Fig. 55.
Auxiliary Temperature Actuator	Mounted to auxiliary HVAC box, near blower motor. See Fig. 41.
Blower Motor	Under right side of dash. See Fig. 39.
Blower Motor (Auxiliary) (Suburban & Yukon XL)	Behind right rear quarterpanel. See Fig. 25.
Blower Motor (Auxiliary) (Tahoe & Yukon)	Right rear of passenger compartment. See Fig. 48.
Door Lock Actuator (Cargo)	In right cargo door. See Fig. 100.
Door Lock Actuator (Liftgate)	Near center of lift gate. See Fig. 99.
Front Axle Actuator Connector (1500 Series)	On front axle housing. See Fig. 10.
Front Axle Actuator Connector (2500 Series)	On front axle housing. See Fig. 11.
Front Axle Actuator (1500 Series)	On front axle housing. See Fig. 10.
Front Axle Actuator (2500 Series)	On front axle housing. See Fig. 11.
Fuel Pump & Sender Assembly Connector (Primary)	On primary fuel pump assembly. See Fig. 109.
Fuel Pump & Sender Assembly Connector (Secondary) (W/Dual Tanks)	On secondary fuel pump assembly. See Fig. 110.
Fuel Pump & Sender Assembly (Primary)	In primary fuel tank. See Fig. 109.
Fuel Pump & Sender Assembly (Secondary) (W/Dual Tanks)	In secondary fuel tank. See Fig. 110.
Idle Air Control Valve (4.8L, 5.3L & 6.0L)	Top front of intake manifold. See Fig. 72.
Mode Actuator	On left side of HVAC module. See Fig. 15.
Mode Actuator (Auxiliary) (Suburban & Yukon XL)	At front of auxiliary HVAC module. See Fig. 25.
Mode Actuator (Auxiliary) (Tahoe & Yukon)	On auxiliary HVAC module assembly. See Fig. 48.
Mode Actuator Connector (Auxiliary)	At front of auxiliary HVAC module. See Fig. 25.
Precharge Pump	Left side of engine compartment. See Fig. 67.
Precharge Pump Connector	On precharge pump. See Fig. 67.
Rear Steering Gear Motor	On rear steering actuator. See Fig. 52.
Recirculation Actuator	Upper right of HVAC module. See Fig. 38.
Recirculation Actuator Connector	Upper right of HVAC module. See Fig. 15.
Seat Bolster Motor (Driver)	In driver's seat back. See Fig. 115.
Seat Bolster Motor (Right Front)	In right front seat back. See Fig. 117.
Seat Front Vertical Motor (Driver)	Below driver's seat. See Fig. 114.
Seat Front Vertical Motor (Right)	Below right front seat. See Fig. 92.
Seat Horizontal Motor (Driver)	Below driver's seat. See Fig. 114.
Seat Horizontal Motor (Right)	Below right front seat. See Fig. 92.
Seat Lumbar Motor (Driver)	Below driver's seat. See Fig. 115.
Seat Lumbar Motor (Right Front)	In right front seat back. See Fig. 117.
Seat Rear Vertical Motor (Driver)	Below driver's seat. See Fig. 114.
Seat Rear Vertical Motor (Right)	Below right front seat. See Fig. 92.
Seat Recliner Motor (Driver)	Below driver's seat. See Fig. 114.
Seat Recliner Motor (Right)	Below right front seat. See Fig. 92.
Starter	Lower right rear of engine. See Fig. 34.
Sun Roof Motor	Part of sun roof module.
Supplemental Brake Assist Pump Motor	On brake booster assembly. See Fig. 65.
Supplemental Brake Assist Pump Motor Connector	Near brake booster assembly. See Fig. 65.
Throttle Actuator Control (TAC) Motor	On front of engine. See Fig. 76.
Throttle Actuator Control (TAC) Motor Connector	On throttle actuator control (TAC) motor. See Fig. 76.
Window Motor (Driver)	In driver's door. See Fig. 103.
Window Motor (Left Rear)	In left rear door. See Fig. 95.
Window Motor (Left Rear)	In left rear door. See Fig. 105.
Window Motor (Right Front)	In right front door. See Fig. 104.
Window Motor (Right Rear)	In right rear door. See Fig. 106.
Windshield Washer Fluid Pump Connector	On washer fluid pump. See Fig. 112.

GMC Yukon XL C1500 2005 - SENDING UNITS & SENSORS

GMC Yukon XL C1500 2005 SENDING UNITS & SENSORS LOCATION

Component	Location
Accelerator Pedal Position Sensor	Behind accelerator pedal.
A/C Refrigerant Pressure Sensor	In high side pressure line, near compressor. See Fig. 35.
A/C Refrigerant Pressure Sensor Connector	On A/C refrigerant pressure sensor. See Fig. 35.
Air Temperature Sensor Assembly (Inside)	In headliner, above driver.
Air Temperature Sensor Connector (Lower Right)	On lower right air temperature sensor. See Fig. 39.
Air Temperature Sensor Connector (Upper Auxiliary)	On upper auxiliary air temperature sensor. See Fig. 46.
Air Temperature Sensor Connector (Upper Left)	On upper left air temperature sensor. See Fig. 43.
Air Temperature Sensor Connector (Upper Right)	On upper right air temperature sensor. See Fig. 43.
Air Temperature Sensor (Lower Auxiliary) (Suburban & Yukon XL)	Behind right "C" pillar, at front of HVAC. See Fig. 25.
Air Temperature Sensor (Lower Auxiliary) (Tahoe & Yukon)	Behind right "C" pillar, at front of HVAC. See Fig. 48.
Air Temperature Sensor (Lower Left)	Behind dash, at left end of HVAC module. See Fig. 44.
Air Temperature Sensor (Lower Right)	Behind dash, at bottom of HVAC module. See Fig. 45.
Air Temperature Sensor (Outside)	Mounted to radiator core support. See Fig. 118.
Air Temperature Sensor (Upper Auxiliary) (Except Tahoe & Yukon)	In rear auxiliary HVAC upper duct, near "C" pillar. See Fig. 46.
Air Temperature Sensor (Upper Auxiliary) (Tahoe & Yukon)	In right "C" pillar. See Fig. 48.
Air Temperature Sensor (Upper Left)	At center of dash, below dash trim panel. See Fig. 43.
Air Temperature Sensor (Upper Right)	At center of dash, below dash trim panel. See Fig. 43.
Ambient Air Temperature Sensor	In right front bumper filler assembly. See Fig. 36.
Ambient Light Sensor	On top center of dash.
Automatic Transmission Fluid Temperature Sensor	In automatic transmission.
Automatic Transmission Input Shaft Speed Sensor	In automatic transmission.
Camshaft Position (CMP) Sensor Connector (Except 8.1L)	On top center rear of engine. See Fig. 77.
Camshaft Position (CMP) Sensor (Except 8.1L)	On top center rear of engine. See Fig. 77.
Camshaft Position Sensor (8.1L)	On left side of timing cover.
Crankshaft Position (CKP) Sensor Connector (8.1L)	On crankshaft position (CKP) sensor. See Fig. 111.
Crankshaft Position (CKP) Sensor (4.8L, 5.3L & 6.0L)	On lower right rear of engine block. See Fig. 79.
Crankshaft Position (CKP) Sensor (5.3L VIN T)	On lower right rear of engine block.
Crankshaft Position (CKP) Sensor (6.0L VIN U)	On lower right rear of engine block.
Crankshaft Position (CKP) Sensor (8.1L VIN G)	On top left rear of engine block, near bellhousing. See Fig. 111.
Engine Coolant Temperature (ECT) Sensor Connector (4.8L, 5.3L & 6.0L)	Left side of engine. See Fig. 6.
Engine Coolant Temperature (ECT) Sensor Connector (8.1L)	Center of right cylinder head. See Fig. 108.
Engine Coolant Temperature (ECT) Sensor Connector (8.1L)	Top right side of engine. See Fig. 73.
Engine Coolant Temperature (ECT) Sensor (4.3L)	On side of left cylinder head. See Fig. 74.
Engine Coolant Temperature (ECT) Sensor (4.8L, 5.3L & 6.0L)	On front side of left cylinder head. See Fig. 72.
Engine Coolant Temperature (ECT) Sensor (8.1L VIN G)	At middle of right cylinder head.
Engine Oil Pressure (EOP) Sensor (4.8L, 5.3L 6.0L)	On top rear of engine. See Fig. 77.
Engine Oil Pressure (EOP) Sensor (8.1L)	On top rear of engine. See Fig. 8.
Fuel Composition Sensor (Except 8.1L)	Inside left frame rail, forward of electronic brake control module.
Fuel Level Sensor (Primary)	In primary fuel tank.
Fuel Level Sensor (Secondary)	In secondary fuel tank.
Fuel Pump & Sender Assembly (Primary)	In primary fuel tank.
Fuel Pump & Sender Assembly (Secondary) (W/Dual Tanks)	In secondary fuel tank.
Fuel Sender	In fuel tank. See Fig. 24.
Fuel Tank Pressure Sensor	On fuel tank, integral to fuel pump & sender assembly.
Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 (4.8L & 5.3L)	In left exhaust pipe, before catalytic converter. See Fig. 83.
Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 (6.0L)	In left exhaust pipe, before catalytic converter. See Fig. 84.
Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2 (4.8L & 5.3L)	In left exhaust pipe, after catalytic converter. See Fig. 83.
Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2 (6.0L)	After left catalytic converter. See Fig. 84.
Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 (4.8L & 5.3L)	In right exhaust pipe, before catalytic converter. See Fig. 83.
Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 (6.0L)	Right exhaust pipe, before catalytic converter. See Fig. 84.
Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 (4.8L & 5.3L)	In right exhaust pipe, after catalytic converter. See Fig. 83.
Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 (6.0L)	In right exhaust pipe, after catalytic converter. See Fig. 84.
HO2 Sensor Connector - Bank 1, Sensor 1	Left front of transmission. See Fig. 5.
Inflatable Restraint Electronic Front End Sensor (Left)	On left front of vehicle, by core support.
Inflatable Restraint Electronic Front End Sensor (Right)	On right front of vehicle, by core support.
Inflatable Restraint Front End Discriminating Sensor	In front of radiator. See Fig. 91.
Inflatable Restraint Passenger Presence System (PPS) Sensor	Below right front seat. See Fig. 92.
Inflatable Restraint Side Impact Sensor (SIS) (Left)	Mounted inside driver door, behind trim panel. See Fig. 91.
Inflatable Restraint Side Impact Sensor (SIS) (Right)	Mounted inside passenger door, behind trim panel. See Fig. 91.
Inside Auxiliary Air Temperature Sensor Assembly	In headliner, near left "C" pillar.
Intake Air Temperature (IAT)/Mass Airflow (MAF) Sensor	In air induction tube. See Fig. 82.
Knock Sensor Bank No.1 (8.1L)	On left side of engine, forward of oil filter.
Knock Sensor (KS) 1 (4.8L, 5.3L & 6.0L)	In valley, under intake manifold. See Fig. 78.
Knock Sensor (KS) 2 Connector (8.1L)	Left side of engine. See Fig. 7.
Knock Sensor (KS) 2 (4.8L, 5.3L & 6.0L)	In valley, under intake manifold. See Fig. 78.
Knock Sensor (KS) 2 (8.1L)	On left side of engine. See Fig. 7.
Manifold Absolute Pressure (MAP) Sensor Connector (8.1L)	On top rear of engine, on intake manifold. See Fig. 73.
Manifold Absolute Pressure (MAP) Sensor (4.8L, 5.3L & 6.0L)	On top rear of engine. See Fig. 72.
Manifold Absolute Pressure (MAP) Sensor (8.1L)	Top of intake manifold. See Fig. 108.
Mass Air Flow (MAF) Sensor	Right rear of engine compartment. See Fig. 33.
Object Sensor (Left Rear Corner)	On left side of rear bumper.
Object Sensor (Left Rear Middle)	On left middle of rear bumper.
Object Sensor (Right Rear Corner)	On right side of rear bumper.
Object Sensor (Right Rear Middle)	On right middle of rear bumper.
Passlock Sensor	On ignition switch. See Fig. 96.
Propshaft Speed Sensor (Front)	On left front side of transfer case.
Propshaft Speed Sensor (Rear)	On transfer case extension housing.
Rear Wheel Position Sensor	On bottom of rear steering actuator. See Fig. 53.
Steering Wheel Speed/Position Sensor	Near base of steering column. See Fig. 50.
Sunload Sensor Assembly	On center of dash, near defrost deflectors. See Fig. 49.
Sunload Sensor Connector	On sunload sensor. See Fig. 49.
Sunload Sensor Harness	Under top in instrument panel. See Fig. 49.
Suspension Position Sensor Chassis Connector (Left Front)	Near left front wheel. See Fig. 56.
Suspension Position Sensor Chassis Connector (Right Front)	Near right front wheel. See Fig. 56.
Suspension Position Sensor Connector (Left Front)	On left front suspension position sensor. See Fig. 62.
Suspension Position Sensor Connector (Left Rear)	On left rear suspension position sensor. See Fig. 59.
Suspension Position Sensor Connector (Right Rear)	On right rear suspension position sensor. See Fig. 61.
Suspension Position Sensor (Left Front)	On control arm, behind left front shock. See Fig. 62.
Suspension Position Sensor (Left Rear)	Behind left rear shock, near frame rail. See Fig. 59.
Suspension Position Sensor Pigtail Connector (Left Front)	Near left front wheel. See Fig. 56.
Suspension Position Sensor (Right Front)	On control arm, behind right front shock.
Suspension Position Sensor (Right Rear)	Right rear frame rail. See Fig. 61.
Throttle Position (TP) Sensor (4.8L, 5.3L & 6.0L)	On throttle body. See Fig. 72.
Vehicle Speed Sensor (VSS) (A/T)	Right rear of transmission. See Fig. 87.
Vehicle Speed Sensor (VSS) (M/T)	On rear of transmission. See Fig. 80.
Vehicle Speed Sensor (VSS) (Transfer Case)	On rear of transfer case. See Fig. 89.
Washer Fluid Level Sensor Connector	On washer fluid reservoir. See Fig. 112.
Wheel Speed Sensor (WSS) Chassis Connector (Left Front)	Near left front wheel. See Fig. 56.
Wheel Speed Sensor (WSS) Chassis Connector (Right Front)	Near right front wheel. See Fig. 56.
Wheel Speed Sensor (WSS) Pigtail Connector (Left Front)	Near left front wheel. See Fig. 56.
Wheel Speed Sensor (WSS) (2WD) (Right Front)	On right front hub assembly. See Fig. 68.
Wheel Speed Sensor (WSS) (4WD) (Right Front)	On right front hub assembly. See Fig. 69.
Yaw & Lateral Acceleration Sensor Connector (Escalade EXT)	Below right front seat. See Fig. 71.
Yaw & Lateral Acceleration Sensor (Escalade)	Below center console. See Fig. 70.
Yaw & Lateral Acceleration Sensor (Escalade EXT)	Under right front seat. See Fig. 71.

GMC Yukon XL C1500 2005 - SOLENOIDS & SOLENOID VALVES

GMC Yukon XL C1500 2005 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
A/C Compressor Clutch Connector (4.3L)	On A/C compressor clutch. See Fig. 42.
A/C Compressor Clutch Connector (4.8L, 5.3L & 6.0L)	On A/C compressor clutch. See Fig. 34.
A/C Compressor Clutch (4.8L, 5.3L & 6.0L)	On A/C compressor. See Fig. 34.
Evaporative Emissions Canister Vent Solenoid	On right front side of fuel tank. See Fig. 75.
Evaporative Emissions (EVAP) Canister Purge Solenoid (4.8L, 5.3L & 6.0L)	Behind throttle body, near front of engine. See Fig. 72.
Evaporative Emissions (EVAP) Canister Purge Solenoid (8.1L VIN G)	To left of throttle body, near front of engine.
Exhaust Gas Recirculation (EGR) Valve Connector (4.3L)	Top front of engine. See Fig. 42.
Exhaust Gas Recirculation (EGR) Valve Connector (4.8L, 5.3L & 6.0L)	Right front of engine. See Fig. 76.
Exhaust Gas Recirculation (EGR) Valve (4.8L, 5.3L & 6.0L)	Right front of engine. See Fig. 76.
Exhaust Gas Recirculation (EGR) Valve (8.1L)	On top rear of engine. See Fig. 8.
Fuel Injector 2 Connector	Right side of engine. See Fig. 76.
Fuel Injector 6	Right side of engine. See Fig. 76.
Fuel Injector 8	Right side of engine. See Fig. 76.
Pressure Control Solenoid Valve	In automatic transmission. See Fig. 87.
Shock Absorber Solenoid (Left Front)	Part of left front shock.
Shock Absorber Solenoid (Left Rear)	Part of left rear shock.
Shock Absorber Solenoid (Right Front)	Part of right front shock.
Shock Absorber Solenoid (Right Rear)	Part of right rear shock.
Starter Solenoid Connector	On starter solenoid. See Fig. 34.
Suspension Damper Solenoid Connector (Left Front)	Top of left front suspension damper. See Fig. 56.
Suspension Damper Solenoid Connector (Left Rear)	Near left rear suspension damper. See Fig. 58.
Suspension Damper Solenoid Connector (Right Front)	Top of right front suspension damper. See Fig. 56.
Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Valve	In automatic transmission. See Fig. 87.
Torque Converter Clutch (TCC) Solenoid Valve	In automatic transmission. See Fig. 87.
1-2 Shift Solenoid (SS) Valve	In automatic transmission. See Fig. 87.
2-3 Shift Solenoid (SS) Valve	In automatic transmission. See Fig. 87.
3-2 Shift Solenoid (SS) Valve	In automatic transmission. See Fig. 87.

GMC Yukon XL C1500 2005 - SWITCHES

GMC Yukon XL C1500 2005 SWITCHES LOCATION

Component	Location
A/C High Pressure Switch	On rear of A/C compressor. See Fig. 34.
A/C High Pressure Switch Connector (Except 4.3L)	On A/C high pressure switch. See Fig. 34.
A/C High Pressure Switch Connector (4.3L)	On A/C high pressure switch. See Fig. 42.
A/C Low Pressure Switch	On right side of accumulator. See Fig. 33.
Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch	In automatic transmission. See Fig. 87.
Brake Fluid Level Switch	On left side of brake fluid reservoir. See Fig. 64.
Brake Fluid Level Switch Connector	On brake fluid level switch. See Fig. 64.
Brake Pressure Differential Switch	Mounted to power brake booster, below master cylinder. See Fig. 67.
Brake Pressure Differential Switch Connector	On brake pressure differential switch. See Fig. 67.
Coolant Level Switch	In coolant reservoir.
Coolant Level Switch Connector	Near coolant reservoir. See Fig. 33.
Door Ajar Switch (Cargo)	In right cargo door. See Fig. 100.
Door Ajar Switch - Driver	Part of driver door latch assembly.
Door Ajar Switch - Front Passenger	Part of passenger front door latch assembly.
Door Jamb Switch Connectors (Mini Wedge) (Left Rear)	In left rear door. See Fig. 105.
Door Jamb Switch Connectors (Mini Wedge) (Right Rear)	In right rear door. See Fig. 106.
Door Jamb Switch (Mini Wedge) (Driver)	Rear of driver's door. See Fig. 103.
Door Jamb Switch (Mini Wedge) (Right Front)	At rear of right front door. See Fig. 104.
Engine Oil Level Switch	On lower right side of oil pan. See Fig. 34.
Inflatable Restraint Seat Position Switch (Right)	Below right front seat. See Fig. 92.
Lift Gate Ajar Switch Connector (Left)	Left side of lift gate. See Fig. 99.
Lift Gate Ajar Switch Connector (Right)	Right side of lift gate. See Fig. 99.
Lift Glass Ajar Switch	Center of lift gate. See Fig. 99.
Park Brake Switch	Part of park brake assembly.
Park/Neutral Position (PNP) Switch	On left side of transmission. See Fig. 88.
Seat Belt Switch Connector	Near driver seat belt buckle. See Fig. 90.
Stoplamp Switch	On top of brake pedal bracket. See Fig. 63.

GMC Yukon XL C1500 2005 - MISCELLANEOUS

GMC Yukon XL C1500 2005 MISCELLANEOUS LOCATION

Component	Location
AM-FM Antenna	Right rear of vehicle. See Fig. 119.
Audio Amplifier	Under center console.
Blower Motor Resistor Assembly	On HVAC module. See Fig. 15.
Blower Motor Resistor Assembly (Auxiliary)	Mounted to auxiliary HVAC box, below blower motor. See Fig. 41.
Blower Motor Resistor Assembly Connector	On HVAC module. See Fig. 15.
Body Harness	Right rocker panel. See Fig. 13.
Camper Wiring Harness	Left rear frame rail. See Fig. 28.
Camper Wiring Harness Connector	Left rear frame rail. See Fig. 28.
Data Link Connector	Below left side of dash. See Fig. 17.
Digital Radio Receiver	Behind right side of dash. See Fig. 94.
Digital Radio Receiver Connector	Behind right side of dash. See Fig. 94.
Driver Power Seat Harness	Below driver's seat. See Fig. 22.
Emergency Roof Lamp Harness	Left "B" pillar. See Fig. 23.
Engine Coil Connector (8.1L) (Right)	Top right side of engine. See Fig. 73.
Engine Coil Harness Connector (8.1L) (Right)	Top or right valve cover. See Fig. 73.
Engine Harness (4.8L, 5.3L & 6.0L)	Engine compartment. See Fig. 6.
Engine Harness (8.1L)	Rear of engine compartment. See Fig. 73.
FM Antenna	Left rear of vehicle. See Fig. 119.
Heated Seat Element Connector (Driver Cushion)	On driver's heated seat cushion element. See Fig. 115.
Heated Seat Element (Driver Cushion)	In driver's seat cushion. See Fig. 115.
Heated Seat Element (Right Front Cushion)	In right front seat cushion. See Fig. 117.
Horn (High Note)	Right side of radiator support. See Fig. 107.
Horn (Low Note)	Left side of radiator support. See Fig. 107.
HVAC Harness (Auxiliary)	Right rear of vehicle. See Fig. 46.
Ignition Coil Connector (Component Side) (8.1L)	Center of right valve cover. See Fig. 108.
Ignition Coil Connector (Harness Side) (8.1L)	Center of right valve cover. See Fig. 108.
Ignition Coils (Left Bank)	On top of left valve covers. See Fig. 72.
Ignition Coil 2 (4.8L, 5.3L & 6.0L)	Right side of engine. See Fig. 76.
Ignition Coil 4 (4.8L, 5.3L & 6.0L)	Right side of engine. See Fig. 76.
Ignition Coil 6 (4.8L, 5.3L & 6.0L)	Right side of engine. See Fig. 76.
Ignition Coil 8 (4.8L, 5.3L & 6.0L)	Right side of engine. See Fig. 76.
Inflatable Restraint I/P Module	Right side of instrument panel. See Fig. 91.
Inflatable Restraint Side Impact Module (Left)	On side of left front seat back. See Fig. 91.
Inflatable Restraint Side Impact Module (Right)	On side of right front seat back. See Fig. 91.
Inflatable Restraint Steering Wheel Module	On steering wheel. See Fig. 91.
Inflatable Restraint Steering Wheel Module Coil	Below steering wheel module. See Fig. 91.
Instrument Panel Extension Harness	Left kick panel. See Fig. 102.
Liftgate Latch Connector	In liftgate. See Fig. 123.
Liftgate Lower Latch Connector	In liftgate. See Fig. 123.
Negative Battery Cable (G100)	Left front of engine compartment. See Fig. 1.
Trailer Wiring Connector	Center rear of vehicle. See Fig. 27.
Trailer Wiring Receptacle	Center rear of vehicle. See Fig. 26.
Wiper Motor Connector (Rear)	In center of lift gate. See Fig. 123.

GMC Yukon XL C1500 2005 - CONNECTORS

GMC Yukon XL C1500 2005 CONNECTORS LOCATION

Component	Location
C100 (Black, 16 Pin)	Below underhood fuse block. See Fig. 120.
C102 (Black, 10 Pin)	Near underhood fuse block. See Fig. 120.
C103 (Black, 12 Pin)	Near underhood fuse block. See Fig. 2.
C104 (Black, 12 Pin)	Near underhood fuse block. See Fig. 2.
C114 (Black, 10 Pin)	At front side of underhood fuse block. See Fig. 120.
C115 (Black, 24 Pin)	Behind underhood fuse block.
C125 (Light Gray, 8 Pin)	On radiator support.
C127 (Light Gray, 8 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. See Fig. 120.
C151 (Black, 12 Pin)	Behind underhood fuse block. See Fig. 120.
C152 (Natural, 12 Pin)	Below underhood fuse block. See Fig. 120.
C153 (Black, 3 Pin)	Attached to underhood fuse block mounting bracket. See Fig. 120.
C154 (Black, 3 Pin)	Near underhood fuse block. See Fig. 120.
C155 (Black, 10 Pin)	Near left top front of engine.
C180 (2 Pin)	At left side of engine compartment, attached to front of underhood fuse block.
C198 (Black, 1 Pin)	Near underhood fuse block.
C201 (Black, 32 Pin)	On steering column. See Fig. 50.
C202 (Black, 18 Pin)	Behind top of dash. See Fig. 93.
C203 (Black, 3 Pin)	Near left I/P fuse block.
C206 (Light Gray, 22 Pin)	Behind left kick panel.
C209 (Black, 16 Pin)	Behind right kick panel. See Fig. 13.
C210 (Black, 2 Pin)	Brake/clutch jumper harness to SEO jumper harness.
C214 (Black, 16 Pin)	Behind upper left side of dash.
C220 (Black, 24 Pin)	Behind center of dash.
C221 (Yellow, 4 Pin)	Behind left kick panel.
C222 (Yellow, 4 Pin)	Behind right kick panel. See Fig. 13.
C249 (Black, 4 Pin)	Behind center of dash.
C250 (Gray, 6 Pin)	Behind left side of dash.
C275 (4 Pin)	At base of steering column, next to c201.
C277 (8 Pin)	Behind driver side air bag.
C305 (Black, 16 Pin)	Under left front seat. See Fig. 114.
C306 (Black, 40 Pin)	Under front floor console. See Fig. 70.
C310 (Natural, 17 Pin)	Behind left "B" pillar trim panel. See Fig. 105.
C312 (Blue, 8 Pin)	In right rear of vehicle. See Fig. 41.
C313 (Black, 3 Pin)	Behind left kick panel.
C315 (Black, 3 Pin)	Behind right kick panel. See Fig. 13.
C320 (Gray, 13 Pin)	Under left front seat. See Fig. 114.
C321 (Light Blue, 24 Pin)	Under left front seat. See Fig. 114.
C322 (Natural, 10 Pin)	Under left front seat. See Fig. 114.
C323 (Black, 6 Pin)	Under left front seat. See Fig. 114.
C324 (Black, 8 Pin)	Under left front seat. See Fig. 115.
C325 (Gray, 6 Pin)	Under left front seat. See Fig. 114.
C326 (Gray, 6 Pin)	Under right front seat. See Fig. 116.
C329 (Black, 4 Pin)	Under right front seat. See Fig. 117.
C350 (Black, 2 Pin)	At top of transfer case.
C370 (Black, 14 Pin)	Below center console.
C388 (Black, 6 Pin)	Under right front seat. See Fig. 116.
C390 (Black, 4 Pin)	Body harness to center sail harness.
C396 (Natural, 17 Pin)	Behind right "B" pillar trim panel. See Fig. 106.
C397 (Except Tahoe & Yukon) (Black, 6 Pin)	Behind right rear quarterpanel. See Fig. 25.
C397 (Tahoe & Yukon) (Black, 6 Pin)	Left rear passenger compartment. See Fig. 41.
C399 (Black, 16 Pin)	Under right front seat. See Fig. 92.
C402 (Gray, 7 Pin)	Near left rear frame rail. See Fig. 121.
C405 (Black, 2 Pin)	Near left taillight assembly. See Fig. 122.
C410 (Black, 2 Pin)	At right rear of vehicle.
C411 (Black, 2 Pin)	At left rear of vehicle.
C450 (Black, 38 Pin)	At right rear of vehicle. See Fig. 122.
C499 (Gray, 12 Pin)	Behind right quarterpanel, near "D" pillar. See Fig. 123.
C900 (Black, 3 Pin)	In rear liftgate.
C901 (Black, 8 Pin)	In rear liftgate.
Driver Power Seat Inline Connector	Below driver's seat. See Fig. 22.
Forward Lamp Inline Connector	Near underhood fuse block. See Fig. 4.
I/P Harness Inline Connector	Near underhood fuse block. See Fig. 4.
I/P Inline Connectors	Near underhood fuse block. See Fig. 4.

GMC Yukon XL C1500 2005 - GROUNDS

GMC Yukon XL C1500 2005 GROUNDS LOCATION

Component	Location
Automatic Transfer Case/ABS Ground	Left rear frame rail. See Fig. 18.
Electronic Brake Control Module (EBCM) Ground (GNO)	On left frame rail. See Fig. 18.
Engine Ground Strap (8.1L)	Rear of engine. See Fig. 8.
G100	On left front body mount. See Fig. 1.
G102 (4.8L, 5.3L & 6.0L)	On left side of engine block. See Fig. 6.
G102 (8.1L)	On left side of engine block. See Fig. 7.
G103	On right rear of engine block. See Fig. 5.
G104 (4.8L, 5.3L & 6.0L)	On left rear of engine block. See Fig. 5.
G104 (8.1L)	On left rear of engine block. See Fig. 8.
G105	On lower left front of engine block.
G106	On right front of engine block. See Fig. 5.
G107	Engine ground strap. See Fig. 5.
G110 (1500 Series)	On left front body mount. See Fig. 10.
G110 (2500 Series)	On left front body mount. See Fig. 11.
G200	Near right "A" pillar. See Fig. 12.
G203	Near left "A" pillar. See Fig. 16.
G302	On left rear body mount. See Fig. 18.
G305	On left "B" pillar. See Fig. 19.
G306	On right "B" pillar. See Fig. 21.
G401	On left rear body mount.
G402	Near rear bumper.
G403	On left rear body mount. See Fig. 24.
G410	Behind right rear quarterpanel. See Fig. 41.

GMC Yukon XL C1500 2005 - SPLICES

GMC Yukon XL C1500 2005 SPLICES LOCATION

Component	Location
SP203	Near left "A" pillar. See Fig. 16.
SP205	Behind left I/P fuse block. See Fig. 17.
SP206	On left "B" pillar. See Fig. 101.
SP207	Behind left kick panel. See Fig. 102.
SP250	Left end of instrument panel. See Fig. 93.
SP410	Right rear passenger compartment. See Fig. 25.
SP410A	Behind right rear quarterpanel. See Fig. 25.
SP410B	Behind right rear quarterpanel.
S100	In forward lamp harness.
S101	In forward lamp harness.
S102	In engine harness.
S103	In engine harness.
S104	In engine harness.
S107	In forward lamp harness.
S110	In engine harness.
S112	In chassis harness.
S150	In chassis harness.
S151	In left engine ignition coil jumper harness.
S152	In left engine ignition coil jumper harness.
S153	In right engine ignition coil jumper harness.
S154	In right engine ignition coil jumper harness.
S156	In engine harness.
S157	In right engine ignition coil jumper harness.
S159	In left engine ignition coil jumper harness.
S160	In right engine ignition coil jumper harness.
S166	In forward lamp harness, approximately 5 cm (2 in) from breakout for C104.
S200	In roof marker harness.
S201	In roof marker harness.
S202	In I/P harness.
S205	In I/P harness.
S207	In headliner harness.
S208	In roof marker harness.
S210	In I/P harness.
S211	In I/P harness.
S212	In I/P harness.
S213	In I/P harness.
S214	In I/P harness.
S216	In steering column harness.
S217	In steering column harness.
S218	In I/P harness.
S240	In steering column harness.
S241	In steering column harness.
S303	In console harness.
S307	In console harness.
S308	In body harness.
S309	In driver seat jumper harness.
S310	In driver seat jumper harness.
S311	In driver seat harness.
S312	In chassis harness.
S313	In chassis harness.
S314	In driver seat jumper harness.
S315	In driver seat jumper harness.
S319	In body harness.
S321	In headliner harness.
S322	In left rear heated seat harness.
S333	In console harness.
S335	In I/P harness.
S340	In roof marker harness.
S351	In headliner harness.
S389	In right rear heated seat harness.
S408	In left rear taillamp harness.
S412	In left rear taillamp harness.
S413	In right rear taillamp harness.
S423	In license lamp harness.
S424	In license lamp harness.
S480	In right rear taillamp harness.
S500	In left front door harness.
S601	In front passenger door harness.
S710	In left rear door harness.
S810	In right rear door harness.
S901	In liftgate harness.
S902	In liftgate harness.
S903	In right hip lamp harness.
S904	In right hip lamp harness.
S905	In left hip lamp harness.
S907	In license lamp harness.
S910	In liftgate harness.
S911	In liftgate harness.