GMC Yukon 1999 - 1999 GENERAL MOTORS "C" & "K" Series, Escalade, Sierra, Suburban, Tahoe & Yukon

GMC Yukon 1999 - BUZZERS, RELAYS & TIMERS

GMC Yukon 1999 BUZZERS, RELAYS & TIMERS

Component	Component Location
A/C Compressor Clutch Relay	In underhood fuse/relay center.
Air Injection Reaction Relay	In underhood fuse/relay center.
Auxiliary Battery Relay	On left front inner fender panel, next to underhood fuse/relay center.
Auxiliary Blower Motor Relays (High/Med/Lo)	On auxiliary A/C-heater blower housing, right rear of vehicle.
Auxiliary Cooling Fan Relay	On underhood fuse/relay center.
Blower Motor Relay (High)	On top of front A/C-heater blower housing.
Brake Light Relay	In underhood fuse/relay center.
Cargo Door Lock Relay	Behind left "C" pillar.
Daytime Running Light (DRL) Relay	On convenience center.
Door Lock Relay	Under center of dash, near remote control door lock receiver.
Emergency Vehicle Front Light Relay	Behind right side of dash.
Fog Light Relay	On convenience center.
Fuel Pump Balance Relay (6.5L VIN F)	On fuel pump balance module.
Fuel Pump Balance Relay (6.5L VIN S)	On fuel pump balance module.
Fuel Pump Relay	In underhood fuse/relay center.
Glow Plug Relay (6.5L VIN F)	On top left rear of engine. See Fig. 7.
Glow Plug Relay (6.5L VIN S)	On top left rear of engine. See Fig. 7.
Heated Mirror Relay	In underhood fuse/relay center.
Horn Relay	In underhood fuse/relay center.
Liftgate Release Relay	On right center of relay.
Power Amplifier Relay	Behind center of dash.
Spot Light Relay	Behind dash, near convenience center.
Starter Relay	In underhood fuse/relay center.
Stoplight Relay	In underhood fuse/relay center.
Transfer Case Relay	In engine compartment, on right side of firewall.
Turn/Hazard Flasher	On convenience center.

GMC Yukon 1999 - CIRCUIT PROTECTION DEVICES

GMC Yukon 1999 CIRCUIT PROTECTION DEVICES

Component	Component Location
Auxiliary Power Center	Center of dash, below heater controls.
Convenience Center	Under left side of dash.
Fuse A & B (police)	On right side of radiator support.
Fusible Link	Molded into positive battery cable.
I/P Fuse Block	Under left side of dash.
Mega Fuse Block	On right front of engine compartment, near battery.
Underhood Fuse/Relay Center	On left rear of engine compartment. See Fig. 8.

GMC Yukon 1999 - CONTROL UNITS

GMC Yukon 1999 CONTROL UNITS

Component	Component Location
Accelerator Pedal Position Module (6.5L VIN F)	Part of accelerator pedal. See Fig. 15.
Accelerator Pedal Position Module (6.5L VIN S)	Part of accelerator pedal. See Fig. 15.
Air Bag Driver Inflator Module	At top of steering column.
Audio Alarm Module	On convenience center.
Automatic Transfer Case Control Module	Behind left side of dash.
Auxiliary Heater Control Module (Front)	Right side of steering column.
Auxiliary Heater Control Module (Rear)	Right side of steering column.
Auxiliary HVAC Control Module (Front)	In front of overhead console.
Auxiliary HVAC Control Module (Rear)	In rear of overhead console.
Auxiliary HVAC Logic Module	In overhead console.
Body Control Module	In center console.
Cruise Control Module	In left rear of engine compartment, on firewall.
Daytime Running Light (DRL) Module	Behind left side of dash, taped to panel wiring harness.
Door Lock Control Module	In front of left rear wheelwell.
Electronic Brake Control Module (EBCM)	On left side of engine compartment. See Fig. 8.
Electronic Variable Orifice (EVO)/Passlock Control Module	Under center of dash.
Fuel Pump Balance Module	Inside left side frame rail.
Fuel Solenoid Driver (6.5L VIN F)	On left side of fuel injection pump. See Fig. 11.
Fuel Solenoid Driver (6.5L VIN S)	On left side of fuel injection pump. See Fig. 11.
Glow Plug Control Module (6.5L VIN F)	On left rear of intake manifold.
Glow Plug Control Module (6.5L VIN S)	On left rear of intake manifold.
Heated Seat Module	Under each respective power seat.
HVAC Control Module	Part of heater controls in center of dash.
Ignition Control Module (4.3L VIN W)	On right side, rear of engine.
Ignition Control Module (5.0L VIN M)	On right side, rear of engine.
Ignition Control Module (5.7L VIN R)	On right side, rear of engine.
Ignition Control Module (7.4L VIN J)	On rear of intake manifold.
Inflatable Restraint Sensing & Diagnostic Module	Under driver's seat carpet.
Interior Light Control Module	Under center of dash.
Low Coolant Level Indicator Module (6.5L VIN F)	Behind center of dash.
Low Coolant Level Indicator Module (6.5L VIN S)	Behind center of dash.
Powertrain Control Module (PCM) (6.5L VIN F)	Behind right side of dash, near blower motor.
Powertrain Control Module (PCM) (6.5L VIN S)	Behind right side of dash, near blower motor.
Remote Control Door Lock Receiver	Behind center of dash.
Transfer Case Control Module (TCCM)	Under dash, on steering column support bracket.
Vehicle Control Module (VCM)	On left side of engine compartment. See Fig. 8.
Wiper Motor Module (Front)	On firewall, behind wiper motor.
Wiper Motor Module (Rear)	On lower inner center of rear window.

GMC Yukon 1999 - MOTORS

GMC Yukon 1999 MOTORS

Component	Component Location
Air Injection Reaction (Secondary) Pump (5.0L VIN M)	On front of engine.
Air Injection Reaction (Secondary) Pump (5.7L VIN R)	On front of engine.
Air Injection Reaction (Secondary) Pump (7.4L VIN J)	On front of engine.
Air Injection Reaction Pump (7.4L VIN J)	On front of engine.
Auxiliary Blower Motor	Behind right rear wheelwell.
Auxiliary Cooling Fan Motor	In front of radiator.
Balance Fuel Pump (Dual Tanks Only)	On inside left frame rail, near front of rear tank.
Blower Motor	Under right side of dash.
Fuel Lift Pump (6.5L VIN F)	Inside left frame rail, below driver's door.
Fuel Lift Pump (6.5L VIN S)	Inside left frame rail, below driver's door.
Injection Timing Stepper Motor (6.5L VIN F)	On top right front of engine.
Injection Timing Stepper Motor (6.5L VIN S)	On top right front of engine.
Mode Door Motor	On front & rear (if equipped) A/C-heater housing.
Recirculation Door Motor	On A/C-heater housing.
Temperature Door Motor	On front & rear (if equipped) A/C-heater housing.
Transfer Case Encoder Motor	On right side of transfer case.
Windshield Washer Pumps (Front & Rear)	In washer fluid reservoir, near left shock tower.

GMC Yukon 1999 - SENDING UNITS & SENSORS

GMC Yukon 1999 SENDING UNITS & SENSORS

Component	Component Location
Automatic Transmission Fluid Temperature Sensor	Inside of transmission oil pan.
Automatic Transmission Input Shaft Speed Sensor	On left side of transmission.
Boost Pressure Sensor (6.5L VIN F)	On top center of engine. See Fig. 7.
Boost Pressure Sensor (6.5L VIN S)	On top center of engine. See Fig. 7.
Camshaft Position (CMP) Sensor (4.3L VIN W)	Inside the distributor. See Fig. 1.
Camshaft Position (CMP) Sensor (5.0L VIN M)	Inside the distributor.
Camshaft Position (CMP) Sensor (5.7L VIN R)	Inside the distributor.
Camshaft Position (CMP) Sensor (7.4L VIN J)	Inside the distributor.
Crankshaft Position (CKP) Sensor (4.3L VIN W)	On bottom front of engine, near crank pulley.
Crankshaft Position (CKP) Sensor (5.0L VIN M)	On bottom front of engine, near crank pulley. See Fig. 3.
Crankshaft Position (CKP) Sensor (5.7L VIN R)	On bottom front of engine, near crank pulley. See Fig. 3.
Crankshaft Position (CKP) Sensor (6.5L VIN F)	On bottom front of engine, near crank pulley. See Fig. 9.
Crankshaft Position (CKP) Sensor (6.5L VIN S)	On bottom front of engine, near crank pulley. See Fig. 9.
Crankshaft Position (CKP) Sensor (7.4L VIN J)	On bottom front of engine, near crank pulley. See Fig. 13.
EGR Control Pressure/BARO Sensor (6.5L VIN F)	On upper left side of firewall, next to wiper motor. See Fig. 5.
EGR Control Pressure/BARO Sensor (6.5L VIN S)	On upper left side of firewall, next to wiper motor. See Fig. 5.
Engine Coolant Temperature Sender	On left cylinder head, near No. 1 spark plug.
Engine Coolant Temperature (ECT) Sensor (4.3L VIN W)	On left rear side of cylinder head.
Engine Coolant Temperature (ECT) Sensor (5.0L VIN M)	On top right front of engine, near thermostat housing.
Engine Coolant Temperature (ECT) Sensor (5.7L VIN R)	On top right front of engine, near thermostat housing.
Engine Coolant Temperature (ECT) Sensor (6.5L VIN F)	On top right front of engine, near thermostat housing.
Engine Coolant Temperature (ECT) Sensor (6.5L VIN S)	On top right front of engine, near thermostat housing.
Engine Coolant Temperature (ECT) Sensor (7.4L VIN J)	On top right front of engine, near thermostat housing. See Fig. 13.
Fuel Pump & Sender	In fuel tank.
Fuel Tank Pressure Sensor	In fuel tank.
Heated Oxygen Sensors (HO2S) (4) (4.3L VIN W)	In exhaust pipe, in front & back of catalytic converters.
Heated Oxygen Sensors (HO2S) (4) (5.0L VIN M)	In exhaust pipe, in front & back of catalytic converters.
Heated Oxygen Sensors (HO2S) (4) (5.7L VIN R)	In exhaust pipe, in front & back of catalytic converters.
Heated Oxygen Sensors (HO2S) (4) (7.4L VIN J)	In exhaust pipe, in front & back of catalytic converters.
Inflatable Restraint Front End Discriminating Sensor	Under front outside center of radiator.
Intake Air Temperature (IAT) Sensor (4.3L VIN W)	In air intake duct.
Intake Air Temperature (IAT) Sensor (5.0L VIN M)	In air intake duct.
Intake Air Temperature (IAT) Sensor (5.7L VIN R)	In air intake duct.
Intake Air Temperature (IAT) Sensor (6.5L VIN F)	On top of engine, near intake manifold opening. See Fig. 10.
Intake Air Temperature (IAT) Sensor (6.5L VIN S)	On top of engine, near intake manifold opening. See Fig. 10.
Intake Air Temperature (IAT) Sensor (7.4L VIN J)	In air intake duct.
Knock Sensor (KS) (4.3L VIN W)	On rear of engine block. See Fig. 1.
Knock Sensor (KS) (5.0L VIN M)	On right side of engine block, below exhaust manifold, forward of starter. See Fig. 3.
Knock Sensor (KS) (5.7L VIN R)	On right side of engine block, below exhaust manifold, forward of starter. See Fig. 3.
Knock Sensor (KS) (7.4L VIN J)	On left and right side of engine block, below exhaust manifolds.
Low Coolant Level Sensor	In coolant reservoir, right side of engine compartment.
Manifold Absolute Pressure (MAP) Sensor (4.3L VIN W)	On top right of engine, near fuel injectors.
Manifold Absolute Pressure (MAP) Sensor (5.0L VIN M)	On top right of engine, near fuel injectors. See Fig. 2.
Manifold Absolute Pressure (MAP) Sensor (5.7L VIN R)	On top right of engine, near fuel injectors. See Fig. 2.
Manifold Absolute Pressure (MAP) Sensor (6.5L VIN F)	On top middle of radiator support.
Manifold Absolute Pressure (MAP) Sensor (6.5L VIN S)	On top middle of radiator support.
Manifold Absolute Pressure (MAP) Sensor (7.4L VIN J)	On top right front of engine. See Fig. 13.
Mass Airflow (MAF) Sensor (4.3L VIN W)	In air intake duct.
Mass Airflow (MAF) Sensor (5.0L VIN M)	In air intake duct.
Mass Airflow (MAF) Sensor (5.7L VIN R)	In air intake duct.
Mass Air Flow (MAF) Sensor (7.4L VIN J)	In air intake duct.
Optical/Fuel Temperature Sensor	On top of fuel injection pump. See Fig. 11.
Oxygen Sensor (Bank 1; Sensor 1)	On left exhaust pipe, before catalytic converter.
Oxygen Sensor (Bank 1; Sensor 2)	On left exhaust pipe, after catalytic converter.
Oxygen Sensor (Bank 2; Sensor 1)	On right exhaust pipe, before catalytic converter.
Oxygen Sensor (Bank 2; Sensor 2)	On left exhaust pipe, after catalytic converter.
Shock Sensor	In center console.
Steering Handwheel Speed Sensor	On steering column, near firewall.
Throttle Position (TP) Sensor (4.3L VIN W)	On throttle body assembly. See Fig. 1.
Throttle Position (TP) Sensor (5.0L VIN M)	On throttle body assembly. See Fig. 4.
Throttle Position (TP) Sensor (5.7L VIN R)	On throttle body assembly. See Fig. 4.
Throttle Position (TP) Sensor (7.4L VIN J)	On throttle body assembly. See Fig. 13.
Vehicle Speed Sensor (VSS)	On left side of transmission, left side of transfer case W/4WD.
Water-In-Fuel Sensor (6.5L VIN F)	On fuel filter/manager. See Fig. 12.
Water-In-Fuel Sensor (6.5L VIN S)	On fuel filter/manager. See Fig. 12.
Wheel Speed Sensors (Front) (2)	On left & right front wheel hub assembly.

GMC Yukon 1999 - SOLENOIDS & SOLENOID VALVES

GMC Yukon 1999 SOLENOIDS & SOLENOID VALVES

Component	Component Location
Brake Pressure Modulator Valve (BPMV)	On underside of electronic brake control module.
Brake/Transmission Shift Interlock (BTSI) Solenoid	Right side of steering column, under support bracket.
CDR Valve (6.5L VIN F)	On right side of engine. See Fig. 7.
CDR Valve (6.5L VIN S)	On right side of engine. See Fig. 7.
Engine Shutoff Solenoid (6.5L VIN F)	On top of fuel injection pump. See Fig. 11.
Engine Shutoff Solenoid (6.5L VIN S)	On top of fuel injection pump. See Fig. 11.
Evaporative Emissions (EVAP) Canister Purge Solenoid (4.3L VIN W)	On top right side of engine. See Fig. 1.
Evaporative Emissions (EVAP) Canister Purge Solenoid (5.0L VIN M)	On top right side of engine. See Fig. 2.
Evaporative Emissions (EVAP) Canister Purge Solenoid (5.7L VIN R)	On top right side of engine. See Fig. 2.
Evaporative Emissions (EVAP) Canister Purge Solenoid (7.4L VIN J)	On right side of engine.
Evaporative Emissions (EVAP) Canister Vent Solenoid	On left side of engine compartment.
Exhaust Gas Recirculation (EGR) Solenoid (6.5L VIN F)	On top left rear of engine. See Fig. 7.
Exhaust Gas Recirculation (EGR) Solenoid (6.5L VIN S)	On top left rear of engine. See Fig. 7.
Exhaust Gas Recirculation (EGR) Valve (4.3L VIN W)	On top front of engine, near thermostat housing.
Exhaust Gas Recirculation (EGR) Valve (5.0L VIN M)	On front of engine, near thermostat housing. See Fig. 2.
Exhaust Gas Recirculation (EGR) Valve (5.7L VIN R)	On front of engine, near thermostat housing. See Fig. 2.
Exhaust Gas Recirculation (EGR) Valve (6.5L VIN F)	On top center of engine. See Fig. 7.
Exhaust Gas Recirculation (EGR) Valve (6.5L VIN S)	On top center of engine. See Fig. 7.
Exhaust Gas Recirculation (EGR) Valve (7.4L VIN J)	On top left side of engine.
Exhaust Gas Recirculation (EGR) Vent Solenoid (6.5L VIN F)	On top left rear of engine. See Fig. 7.
Exhaust Gas Recirculation (EGR) Vent Solenoid (6.5L VIN S)	On top left rear of engine. See Fig. 7.
Front Axle Actuator	On right rear of front drive axle.
Fuel Solenoid (6.5L VIN F)	On rear of fuel injection pump. See Fig. 11.
Fuel Solenoid (6.5L VIN S)	On rear of fuel injection pump. See Fig. 11.
Idle Air Control (IAC) Valve (4.3L VIN W)	Attached to right rear of throttle body. See Fig. 1.
Idle Air Control (IAC) Valve (5.0L VIN M)	Attached to right rear of throttle body. See Fig. 4.
Idle Air Control (IAC) Valve (5.7L VIN R)	Attached to right rear of throttle body. See Fig. 4.
Idle Air Control (IAC) Valve (7.4L VIN J)	Attached to right rear of throttle body. See Fig. 13.
Steering Assist Control Solenoid	Part of power steering pump.
Wastegate Solenoid (6.5L VIN F)	On top left rear of engine. See Fig. 7.
Wastegate Solenoid (6.5L VIN S)	On top left rear of engine. See Fig. 7.
Water Valve	In engine compartment, right rear of inner fender.

GMC Yukon 1999 - SWITCHES

GMC Yukon 1999 SWITCHES

Component	Component Location
A/C Compressor Clutch Cycling Switch	On top of accumulator.
A/C High Pressure Cutout Switch	On rear of A/C compressor.
A/C Low Pressure Cutout Switch	On top of A/C compressor.
Back-Up Light Switch (M/T)	On left side of transmission.
Brake Pressure Warning Switch	On underside of electronic brake control module.
Clutch Pedal Position Switch	On top of clutch pedal bracket.
Engine Coolant Temperature Switch	On top right front of engine, near thermostat housing.
Evaporative Emission (EVAP) Purge Solenoid Vacuum Switch (4.3L VIN W)	On top of engine.
Evaporative Emission (EVAP) Purge Solenoid Vacuum Switch (5.0L VIN M)	On top of engine.
Evaporative Emission (EVAP) Purge Solenoid Vacuum Switch (5.7L VIN R)	On top of engine.
Evaporative Emission (EVAP) Purge Solenoid Vacuum Switch (7.4L VIN J)	On top of engine.
Front Axle Switch	On right rear of front drive axle.
Oil Pressure Switch (4.3L VIN W)	On top left rear of engine, near distributor. See Fig. 1.
Oil Pressure Switch (5.0L VIN M)	On top left rear of engine, near distributor.
Oil Pressure Switch (5.7L VIN R)	On top left rear of engine, near distributor.
Oil Pressure Switch (6.5L VIN F)	Under intake manifold, left center of engine. See Fig. 6.
Oil Pressure Switch (6.5L VIN S)	Under intake manifold, left center of engine. See Fig. 6.
Oil Pressure Switch (7.4L VIN J)	On top left rear of engine, near distributor.
Park Brake Warning Switch	On parking brake pedal bracket.
Park/Neutral Position Switch	On left side, center of transmission.
Seat Belt Switch	On driver's seat belt buckle.
Stoplight Switch	On top of brake pedal.
TCC Switch	On top of brake pedal.
Transfer Case Switch	On left, top of transfer case.
Transmission Range Switch	On left side of transmission.

GMC Yukon 1999 - MISCELLANEOUS

GMC Yukon 1999 MISCELLANEOUS

Component	Component Location
Air Injection Reaction (Secondary) Clutch (5.0L VIN M)	On front of air pump.
Air Injection Reaction (Secondary) Clutch (5.7L VIN R)	On front of air pump.
Air Injection Reaction (Secondary) Clutch (7.4L VIN J)	On front of air pump.
Auxiliary Battery	On left front of engine compartment.
Auxiliary Blower Resistor	On top of auxiliary HVAC plenum.
Auxiliary Power Stud	On fan shroud, between battery & fan.
Blower Motor Resistor	On top of HVAC plenum.
Data Link Connector (DLC)	Under left side of dash, left of steering column. See Fig. 14.
Distributor (4.3L VIN W)	Top rear of engine.
Distributor (5.0L VIN M)	Top rear of engine.
Distributor (5.7L VIN R)	Top rear of engine.
Distributor (7.4L VIN J)	Top rear of engine.
Fuel Heater (6.5L VIN F)	On fuel manager/filter. See Fig. 12.
Fuel Heater (6.5L VIN S)	On fuel manager/filter. See Fig. 12.
Fuel Injection Pump (6.5L VIN F)	On top front of engine. See Fig. 11.
Fuel Injection Pump (6.5L VIN S)	On top front of engine. See Fig. 11.
Fuel Injectors (6) (4.3L VIN W)	Top of engine, in intake manifold.
Fuel Injectors (5.0L VIN M)	Top of engine, in intake manifold.
Fuel Injectors (5.7L VIN R)	Top of engine, in intake manifold.
Fuel Injectors (7.4L VIN J)	Top of engine, in intake manifold.
Fuel Manager/Filter (6.5L VIN F)	On top rear of engine. See Fig. 7.
Fuel Manager/Filter (6.5L VIN S)	On top rear of engine. See Fig. 7.
Fuel Pump Prime Connector (4.3L VIN W)	On left rear of engine compartment.
Fuel Pump Prime Connector (5.0L VIN M)	On left rear of engine compartment.
Fuel Pump Prime Connector (5.7L VIN R)	On left rear of engine compartment.
Fuel Pump Prime Connector (6.5L VIN F)	On left side of engine compartment.
Fuel Pump Prime Connector (6.5L VIN S)	On left side of engine compartment.
Fuel Pump Prime Connector (7.4L VIN J)	On left rear of engine compartment.
Ignition Coil (4.3L VIN W)	On top right rear of engine. See Fig. 1.
Ignition Coil (5.0L VIN M)	On top left rear of engine.
Ignition Coil (5.7L VIN R)	On top left rear of engine.
Ignition Coil (7.4L VIN J)	On top left rear of engine.
Power Amplifier	Behind center of dash.
Vehicle Speed Sensor Buffer	Behind right side of dash.

GMC Yukon 1999 - CONNECTORS

GMC Yukon 1999 CONNECTORS

Component	Component Location
C100 (Light Gray, 36 Pin)	In left rear of engine compartment.
C103 (Gray, 4 Pin)	Under brake master cylinder.
C105	At rear of intake manifold.
C107 (Black, 6 Pin)	On left front of transmission.
C108 (Natural, 5 Pin)	Under brake master cylinder.
C109 (Gray, 4 Pin)	Under brake master cylinder.
C110 (Yellow, 2 Pin)	In left rear of engine compartment.
C112 (Black, 8 Pin)	Center rear of engine.
C113 (Black, 15 Pin)	Center rear of engine.
C115 (Black, 2 Pin)	Top front center of engine.
C116 (Black, 3 Pin)	In front left of engine compartment.
C118 (Black, 10 Pin)	Underhood fuse block.
C119 (Black, 6 Pin)	Underhood fuse block.
C120 (Black, 4 Pin)	Near transmission.
C122 (Gray, 20 Pin)	On right side of transmission.
C130 (Black, 4 Pin)	Under brake master cylinder.
C131 (Black, 7 Pin)	Under brake master cylinder.
C132 (Gray, 10 Pin)	Under brake master cylinder.
C140 (Black, 6 Pin)	Under brake master cylinder.
C142 (Black, 2 Pin)	Under brake master cylinder.
C200 (Black, 32 Pin)	Near heater motor.
C203 (Black, 2 Pin)	Near heater motor.
C204 (Natural, 10 Pin)	Behind right side of dash.
C205 (Black, 2 Pin)	At convenience center.
C206 (Black, 6 Pin)	At lower left "A" pillar.
C207 (Black, 8 Pin)	At lower left "A" pillar.
C208	At lower left "A" pillar.
C209 (Black, 8 Pin)	At lower left "A" pillar.
C210 (Gray, 6 Pin)	At convenience center.
C211 (Black, 2 Pin)	Under left front seat.
C212 (Black, 4 Pin)	Under left front seat.
C213 (Black, 8 Pin)	On lower right "A" pillar.
C214 (Black, 4 Pin)	On lower right "A" pillar.
C215 (Blue, 8 Pin)	At lower right "A" pillar.
C216 (Natural, 2 Pin)	At lower right "A" pillar.
C221 (Black, 6 Pin)	At convenience center.
C222 (Natural, 1 Pin)	At convenience center.
C223 (Black, 2 Pin)	At convenience center.
C227 (Black, 6 Pin)	I/P harness.
C228 (Black, 2 Pin)	Under right front seat.
C229 (Black, 6 Pin)	Under right front seat.
C230	Above HVAC evaporator housing.
C231 (Yellow, 8 Pin)	Behind right of dash.
C232 (Yellow, 4 Pin)	Behind right of dash.
C233 (Yellow, 2 Pin)	Behind right of dash.
C235 (Black, 4 Pin)	Near P100.
C236 (Natural, 4 Pin)	Under left seat.
C237 (Natural, 4 Pin)	Under right seat.
C238 (Black, 2 Pin)	I/P harness.
C239	Near heater motor.
C240	Power seat harness.
C242 (Black, 1 Pin)	Behind radio.
C243 (Black, 8 Pin)	At left lower "A" pillar.
C245 (Gray, 2 Pin)	I/P harness.
C250	Above HVAC plenum.
C251	Above HVAC plenum.
C252	Above HVAC plenum.
C266 (Black, 48 Pin)	Near firewall.
C267	In right front seat harness.
C271 (Blue, 10 Pin)	At top of steering column support bracket.
C272 (Gray, 1 Pin)	At top of steering column support bracket.
C280	At convenience center.
C298 (16 Pin)	At convenience center.
C299 (Blue, 10 Pin)	Above HVAC evaporator, housing.
C300 (Blue, 8 Pin)	In overhead console.
C301 (Natural, 10 Pin)	At left front kick panel.
C302 (Light Green, 6 Pin)	At left front kick panel.
C303 (Black, 3 Pin)	Behind headliner.
C304	I/P harness.
C305	Console harness.
C306	Above overhead console.
C307 (Natural, 3 Pin)	Above overhead console.
C308 (Black, 3 Pin)	Above overhead console.
C310	Right heated seat harness.
C311	Left heated seat harness.
C314 (Black, 2 Pin)	At right rear "D" Pillar.
C320 (Black, 4 Pin)	Power seat harness.
C321 (Black, 4 Pin)	Power seat harness.
C322 (Black, 4 Pin)	Power seat harness.
C323 (Black, 4 Pin)	Power seat harness.
C400 (Black, 2 Pin)	Above auxiliary blower motor.
C401 (Gray, 6 Pin)	Above auxiliary blower motor.
C402 (Black, 4 Pin)	At center rear of vehicle.
C404	Near liftgate release motor.
C405	At right "D" pillar.
C406 (Black, 2 Pin)	At right "D" pillar.
C408	Below center rear edge of bed.
C410 (Black, 4 Pin)	Rear radio speaker harness.
C496 (Gray, 6 Pin)	At lower right "B" pillar.
C497 (Black, 6 Pin)	At lower right "B" pillar.
C498 (Gray, 6 Pin)	At lower left "B" pillar.
C499 (Black, 6 Pin)	At lower left "B" pillar.

GMC Yukon 1999 - GROUNDS

GMC Yukon 1999 GROUNDS

Component	Component Location
G101	At right front of engine compartment.
G102 (4.3L VIN W)	On lower right front of engine block.
G102 (6.5L VIN F)	On right front of intake manifold.
G102 (6.5L VIN S)	On right front of intake manifold.
G103 (4.3L VIN W)	On right rear of engine block. See Fig. 1.
G103 (5.0L VIN M)	Near thermostat housing.
G103 (5.7L VIN R)	Near thermostat housing.
G103 (6.5L VIN F)	On left front of intake manifold.
G103 (6.5L VIN S)	On left front of intake manifold.
G103 (7.4L VIN J)	Near thermostat housing. See Fig. 13.
G104 (4.3L VIN W)	On left rear of engine block. See Fig. 1.
G104 (5.0L VIN M)	On rear of right cylinder head.
G104 (5.7L VIN R)	On rear of right cylinder head.
G104 (6.5L VIN F)	On rear of right cylinder head.
G104 (6.5L VIN S)	On rear of right cylinder head.
G104 (7.4L VIN J)	Near thermostat housing. See Fig. 13.
G105 (4.3L VIN W)	On lower right front of engine block.
G105 (5.0L VIN M)	On lower right front of engine block.
G105 (5.7L VIN R)	On lower right front of engine block.
G105 (6.5L VIN F)	On rear of right cylinder head.
G105 (6.5L VIN S)	On rear of right cylinder head.
G105 (7.4L VIN J)	On lower right front of engine block.
G106 (4.3L VIN W)	On right front of engine block.
G108	Top center of firewall.
G110	Below heater lines.
G111	On right rear of engine.
G113	Near left headlight.
G115	On frame rail.
G200	On tie bar.
G201	On tie bar.
G202	On HVAC plenum bracket.
G300	On right "C" pillar.
G400	On right "B" pillar.
G401	Behind bumper.
G404	Near rear crossmember.

GMC Yukon 1999 - SPLICES

GMC Yukon 1999 SPLICES

Component	Component Location
S101	Engine harness, near EBCM.
S112	Engine jumper harness, 9 cm from oil pressure sensor.
S113	Engine harness, 19 cm from EBCM.
S115	Engine jumper harness, 5 cm from oil pressure sensor.
S123	Forward lights harness, 23 cm from left park light breakout.
S128	Forward lights harness, 5 cm from right headlight.
S129	Engine jumper harness, 43 cm from oil pressure sensor.
S146	Engine harness, 22 cm into underhood fuse relay center.
S149	Oxygen sensor harness, 7 cm from right bank oxygen sensor.
S151	Engine Harness, 7 cm inside EBCM.
S154	Left bank fuel injector harness.
S155	Right bank fuel injector harness.
S158	In washer pump jumper harness.
S161	Engine harness, 8 cm from EGR valve.
S168	Battery harness, 25 cm from C121.
S185	At diode D104.
S186	At diode D104.
S192	4WD indicator harness, 10 cm from ABS harness.
S200	I/P harness, 10 cm from steering column.
S201	I/P harness, 8 cm from steering column harness.
S204	I/P harness, 10 cm from C100.
S205	I/P harness, 12 cm from steering column harness.
S206	I/P harness, 6 cm from steering column harness.
S207	I/P harness, 12 cm from steering column harness.
S212	I/P harness, 8 cm from inflatable restraint switch.
S213	I/P harness, 4 cm from steering column harness.
S215	I/P harness, 8 cm from instrument cluster.
S217	I/P harness, 16 cm from instrument cluster.
S218	I/P harness, 16 cm from inflatable restraint switch.
S233	Cross-car harness, 25 cm from left power seat harness.
S235	I/P harness, 4 cm from steering column harness.
S236	I/P harness, 10 cm into steering column harness.
S237	Right front seat harness, 4 cm from power seat lumbar switch.
S238	Cross-car harness, 26 cm into left seat harness.
S242	I/P harness, 12 cm from inflatable restraint switch.
S243	HVAC harness, 4 cm from recirculation door.
S244	HVAC harness, 8 cm from recirculation door.
S248	Cross-car harness, 35 cm before left front door harness.
S251	Cross-car harness, 13 cm from left front door.
S254	Cross-car harness, 12 cm from C210.
S255	Cross-car harness, 20 cm from C210.
S259	Cross-car harness, 7 cm into seat belt switch.
S264	I/P harness, 4 cm from instrument cluster.
S266	Cross-car harness, 8 cm from C210.
S268	I/P harness, 7 cm into HVAC control switch.
S272	I/P harness, 4 cm from auxiliary power outlet.
S281	Cross-car harness, 70 cm from right heated seat.
S283	Spotlight extension harness, 35 cm from C272.
S288	Auxiliary power harness.
S289	Auxiliary power harness.
S290	I/P harness, 8 cm before radio harness.
S292	I/P harness, 22 cm before radio harness.
S298	I/P harness, 24 cm from instrument cluster.
S299	I/P harness, 4 cm into steering column harness.
S300	Lumbar seat harness.
S302	Selectable 4WD harness, 10 cm from transfer case relay.
S303	Power lumbar seat jumper, 20 cm from right power seat.
S304	Rear HVAC control harness, 31 cm from auxiliary HVAC control logic module.
S307	Rear HVAC control harness, 10 cm from auxiliary HVAC control logic module.
S308	Rear HVAC control harness, 5 cm from auxiliary HVAC control logic module.
S312	Illuminated vanity mirror jumper harness, 4 cm from inside rear view mirror.
S315	Taillight extension harness, 40 cm from fuel pump balance module.
S316	Illuminated vanity mirror jumper harness, 8 cm toward left illuminated vanity mirror.
S317	Taillight extension harness, 10 cm from fuel pump & sender breakout.
S318	Taillight extension harness, 10 cm from fuel pump balance module.
S319	Taillight extension harness, 7 cm from fuel pump & sender breakout.
S324	Taillight extension harness, 10 cm from G404.
S330	Floor console harness, 13 cm from left heated seat switch.
S331	Floor console harness, 22 cm from left heated seat switch.
S332	Floor console harness, 28 cm from left heated seat switch.
S335	Floor console harness, 5 cm from C304.
S336	Floor console harness, 5 cm from cross-car incline connector harness.
S400	Auxiliary A/C harness, 17 cm from blower motor relays.
S403	Auxiliary HVAC harness, 7 cm from blower motor resistor.
S416	License lights harness, 4 cm from taillight harness.
S419	Front-to-rear body harness, 13 cm from CHMSL.
S424	Front-to-rear body harness, 13 cm from CHMSL.
S443	In overhead console harness.
S500	Inside left door harness, 8 cm from tweeter speaker.
S501	Inside left door harness.