ELECTRICAL COMPONENT LOCATOR 1999 ELECTRICAL COMPONENT LOCATION Jeep Electrical Component Location

Jeep Grand Cherokee Laredo 1999 - INTRODUCTION

NOTE:

Some component locations are illustrated by graphics. - the following tables for proper figure references.

Jeep Grand Cherokee Laredo 1999 - SAFETY PRECAUTION

WARNING:

When working on vehicles equipped with Supplemental Restraint System (SRS), never apply electrical voltage to the system. This could cause the SRS (air bag) to be deployed.

Jeep Grand Cherokee Laredo 1999 - BUZZERS, RELAYS & TIMERS

Jeep Grand Cherokee Laredo 1999 BUZZERS, RELAYS & TIMERS

Component	Component Location
A/C Compressor Clutch Relay	In power distribution center.
Automatic Shut Down Relay	In power distribution center.
Cigar Lighter Relay	On junction block.
Combination Flasher	On junction block.
Engine Starter Motor Relay	In power distribution center.
Fog Light Relay	On junction block.
Fuel Pump Relay	In power distribution center.
High Beam Relay	On junction block.
Horn Relay	In power distribution center.
Low Beam Relay	On junction block.
Low Beam/Daytime Running Lamp Relay	On junction block.
O2S Heater Relay (Downstream) (California)	In power distribution center.
O2S Heater Relay (Upstream) (California)	In power distribution center.
Park Lamp Relay	On junction block.
Radiator Fan Relay	Behind bumper fascia, below right headlamp. See Fig. 11.
Rear Window Defogger Relay	On junction block.
Sun Roof Delay Relay	On junction block.
Trailer Tow Brake Lamp Relay	In trailer tow harness.
Trailer Tow Left Turn Relay	In trailer tow harness.
Trailer Tow Right Turn Relay	In trailer tow harness.
Transmission Control Relay	In power distribution center.
Wiper High/Low Relay	In power distribution center.
Wiper On/Off Relay	In power distribution center.

Jeep Grand Cherokee Laredo 1999 - CIRCUIT PROTECTION DEVICES

Jeep Grand Cherokee Laredo 1999 CIRCUIT PROTECTION DEVICES

Component	Component Location
Circuit Breaker No. 1	On junction block.
Circuit Breaker No. 2	On junction block.
Junction Block	Behind left side of dash.
Power Distribution Center	At right front corner of engine compartment, next to battery.

Jeep Grand Cherokee Laredo 1999 - CONTROL UNITS

Jeep Grand Cherokee Laredo 1999 CONTROL UNITS

Component	Component Location
Air Bag Control Module	Below center floor console, near park brake.
Blower Motor Controller	On heater-A/C housing, inboard of blower motor. See Fig. 12.
Body Control Module	On left end of dash, attached to junction block.
Controller Anti-Lock Brake	On left side of engine compartment, mounted to hydraulic control unit. See Fig. 10.
Fuel Pump Module	On top of fuel tank.
Powertrain Control Module	On right side of firewall.
Sentry Key Immobilizer Module	Near ignition lock cylinder housing.
Sun Roof Control Module	Near front of sun roof opening.
Transmission Control Module (4.0L)	On right inner fender.
Transmission Control Module (4.7L)	On right inner fender. See Fig. 4.

Jeep Grand Cherokee Laredo 1999 - MOTORS

Jeep Grand Cherokee Laredo 1999 MOTORS

Component	Component Location
Blower Motor	On passenger side end of heater-A/C housing. See Fig. 12.
Driver Blend Door Motor (AZC)	On front of heater-A/C housing. See Fig. 12.
Idle Air Control Motor (4.0L)	On throttle body. See Fig. 1.
Idle Air Control Motor (4.7L)	On throttle body. See Fig. 3.
Mode Door Motor (AZC)	On left end of heater-A/C housing. See Fig. 12.
Passenger Blend Door Motor (AZC)	On heater-A/C housing. See Fig. 12.
Radiator Fan Motor	Behind radiator. See Fig. 11.
Rear Washer Pump	Bottom of washer reservoir. See Fig. 10.
Rear Wiper Motor	On liftgate inner panel.
Recirculation Door Motor (AZC)	On heater-A/C housing. See Fig. 12.
Windshield Washer Pump	Bottom of washer reservoir. See Fig. 10.
Windshield Wiper Motor	On left side of firewall. See Fig. 10.

Jeep Grand Cherokee Laredo 1999 - SENDING UNITS & SENSORS

Jeep Grand Cherokee Laredo 1999 SENDING UNITS & SENSORS

Component	Component Location
Ambient Air Temperature Sensor	On right side of headlamp mounting module grille opening. See Fig. 11.
Battery Temperature Sensor	Below battery tray. See Fig. 11.
Camshaft Position Sensor (4.0L)	On right side of engine, near oil filter. See Fig. 2.
Camshaft Position Sensor (4.7L)	On front top of right cylinder head. See Fig. 4.
Coolant Level Sensor	In coolant reservoir/overflow tank. See Fig. 11.
Crankshaft Position Sensor (4.0L)	At left rear side of engine block, on transmission bellhousing. See Fig. 2.
Crankshaft Position Sensor (4.7L)	On right side of engine block, above starter motor. See Fig. 7.
Engine Coolant Temperature Sensor (4.0L)	At top front of engine, on thermostat housing. See Fig. 1.
Engine Coolant Temperature Sensor (4.7L)	Near front of intake manifold. See Fig. 6.
Engine Oil Pressure Sensor (4.0L)	On right rear side of engine block. See Fig. 2.
Engine Oil Pressure Sensor (4.7L)	On lower left front of engine block, above oil filter. See Fig. 5.
Input Speed Sensor (4.7L)	At left front side of transmission. See Fig. 9.
Intake Air Temperature Sensor (4.0L)	In intake manifold plenum, near front of throttle body. See Fig. 1.
Intake Air Temperature Sensor (4.7L)	In intake manifold plenum, near left side of throttle body. See Fig. 3.
Manifold Absolute Pressure Sensor (4.0L)	On side of throttle body. See Fig. 1.
Manifold Absolute Pressure Sensor (4.7L)	On front of intake manifold. See Fig. 6.
Output Speed Sensor (4.0L)	At left rear side of transmission. See Fig. 8.
Output Speed Sensor (4.7L)	At left rear side of transmission. See Fig. 9.
Oxygen Sensor 1/1 (Upstream) (California) (4.0L)	In exhaust manifold front outlet.
Oxygen Sensor 1/1 (Upstream) (California) (4.7L)	Below left exhaust manifold, in downpipe.
Oxygen Sensor 1/1 (Upstream) (Federal) (4.0L)	In exhaust downpipe.
Oxygen Sensor 1/1 (Upstream) (Federal) (4.7L)	Below right exhaust manifold, in downpipe.
Oxygen Sensor 1/2 (Downstream) (California) (4.0L)	In outlet of front mini catalytic converter.
Oxygen Sensor 1/2 (Downstream) (Federal) (4.0L)	Downstream of in-line catalytic converter. See Fig. 8.
Oxygen Sensor 1/2 (Downstream) (California) (4.7L)	In outlet of left mini catalytic converter.
Oxygen Sensor 1/2 (Downstream) (Federal) (4.7L)	Downstream of in-line catalytic converter.
Oxygen Sensor 2/1 (Upstream) (California) (4.0L)	In exhaust manifold rear outlet.
Oxygen Sensor 2/1 (Upstream) (California) (4.7L)	Below right exhaust manifold, in downpipe.
Oxygen Sensor 2/2 (Downstream) (California) (4.0L)	In outlet of rear mini catalytic converter.
Oxygen Sensor 2/2 (Downstream) (California) (4.7L)	In outlet of right mini catalytic converter.
Pressure Transducer (4.7L)	On right rear side of transmission.
Throttle Position Sensor (4.0L)	On throttle body. See Fig. 1.
Throttle Position Sensor (4.7L)	On throttle body. See Fig. 3.
Wheel Speed Sensor (Left Front)	On left front steering knuckle.
Wheel Speed Sensor (Left Rear)	On left rear brake backing plate.
Wheel Speed Sensor (Right Front)	On right front steering knuckle.
Wheel Speed Sensor (Right Rear)	On right rear brake backing plate.

Jeep Grand Cherokee Laredo 1999 - SOLENOIDS & SOLENOID VALVES

Jeep Grand Cherokee Laredo 1999 SOLENOIDS & SOLENOID VALVES

Component	Component Location
Brake Shift Interlock Solenoid	At top of steering column.
Duty Cycle EVAP/Purge Solenoid	On left fender side shield, forward of EVAP canister. See Fig. 10.
EGR Solenoid (4.7L)	At rear of engine. See Fig. 3.
Leak Detection Pump	At left front corner of engine compartment, below air cleaner housing.
Liftgate Flip-Up Release Solenoid	In liftgate.
Transmission Solenoid Assembly (4.0L)	On transmission valve body. See Fig. 8.
Transmission Solenoid Assembly (4.7L)	On transmission valve body. See Fig. 9.
Vehicle Speed Control Servo	Below battery tray. See Fig. 11.

Jeep Grand Cherokee Laredo 1999 - SWITCHES

Jeep Grand Cherokee Laredo 1999 SWITCHES

Component	Component Location
A/C High-Pressure Cut-Out Switch	On discharge line block fitting, near compressor. See Fig. 11.
A/C Low-Pressure Cycle Clutch Switch	On top of accumulator. See Fig. 11.
Brake Warning Indicator Switch	In master cylinder reservoir.
G-Switch	Below right rear passenger seat.
Park/Neutral Position Switch (4.0L)	On lower left side of transmission. See Fig. 8.
Seat Belt Switch	Integral to driver seat belt buckle.
Stoplight Switch	Top of brake pedal arm.
Transfer Case Switch (4.0L)	On transfer case.
Washer Fluid Level Switch	Near bottom of washer reservoir. See Fig. 10.

Jeep Grand Cherokee Laredo 1999 - MISCELLANEOUS

Jeep Grand Cherokee Laredo 1999 MISCELLANEOUS

Component	Component Location
Blower Motor Resistor Block	Bottom of heater-A/C housing, inboard of blower motor.
Data Link Connector (DLC)	Under left side of dash, near steering column.
Diagnostic Junction Port	At bottom of steering column.
Power Amplifier	Under passenger side rear seat cushion.
Rail Coil (4.0L)	On right side of cylinder head. See Fig. 2.

Jeep Grand Cherokee Laredo 1999 - CONNECTORS

Jeep Grand Cherokee Laredo 1999 CONNECTORS

Component	Component Location
C100 (Black, 3 Pin)	At right front of engine compartment. See Fig. 11.
C102 (4.0L) (Black, 14 Pin)	At right rear of engine compartment. See Fig. 2.
C102 (4.7L) (Black, 14 Pin)	At right rear of engine compartment. See Fig. 4.
C103 (4.0L) (Gray, 14 Pin)	At right rear of engine compartment. See Fig. 2.
C103 (4.7L) (Gray, 14 Pin)	At right rear of engine compartment. See Fig. 4.
C104 (4.0L) (Light Gray, 10 Pin)	At right rear of engine compartment. See Fig. 2.
C104 (4.7L) (Light Gray, 10 Pin)	At right rear of engine compartment. See Fig. 4.
C106 (Gray, 72 Pin)	At right firewall.
C107 (Black, 72 Pin)	At left firewall. See Fig. 10.
C108 (Black, 2 Pin)	At left rear of engine compartment.
C200 (Gray, 72 Pin)	At right firewall.
C201 (White, 4 Pin)	At center console.
C202 (AZC) (White, 12 Pin)	At HVAC unit, on right side of instrument panel.
C202 (MTC) (White, 16 Pin)	At HVAC unit, on right side of dash panel.
C203 (AZC) (White, 2 Pin)	At HVAC unit, on right side of dash panel.
C300 (Gray, 72 Pin)	At left kick panel.
C301	Under driver seat.
C302 (Black, 14 Pin)	At left kick panel.
C303 (White, 11 Pin)	At right "B" pillar.
C304 (Black, 10 Pin)	Under driver seat.
C306 (Black, 6 Pin)	Under passenger seat.
C307 (White, 11 Pin)	At left "B" pillar.
C308 (White, 11 Pin)	At top of liftgate.
C309 (White, 15 Pin)	At left rear headliner.
C310 (Light Green, 10 Pin)	At left rear headliner.
C311 (White, 2 Pin)	At top of liftgate.
C312 (Black, 4 Pin)	At license light.
C313 (White, 2 Pin)	In driver door.
C314 (Light Gray, 14 Pin)	At right cowl.

Jeep Grand Cherokee Laredo 1999 - GROUNDS

Jeep Grand Cherokee Laredo 1999 GROUNDS

Component	Component Location
G100 (4.0L)	Near battery.
G100 (4.7L)	Near battery.
G101	Near battery.
G102	At right side of engine. See Fig. 7.
G103 (4.0L)	At right side of engine. See Fig. 2.
G103 (4.7L)	At right side of engine. See Fig. 7.
G104 (4.0L)	At right rear of engine. See Fig. 2.
G104 (4.7L)	At left side of engine. See Fig. 5.
G106	At left fender.
G107	At left fender.
G108	Near power distribution center. See Fig. 11.
G200	Near air bag control module.
G201	Near air bag control module.
G300	Under passenger seat.
G301	Under driver seat.

Jeep Grand Cherokee Laredo 1999 - SPLICES

Jeep Grand Cherokee Laredo 1999 SPLICES

Component	Component Location
S100	Between generator & fusible link.
S102 (4.0L)	In engine harness near C102, C103 & C104. See Fig. 2.
S102 (4.7L)	In engine harness near C102, C103 & C104.
S103 (4.0L)	In breakout for G103. See Fig. 2.
S103 (4.7L)	In breakout for G103.
S104 (4.0L)	At rear of engine top of transmission. See Fig. 2.
S104 (4.7L)	At rear of engine top of transmission. See Fig. 9.
S105 (4.0L)	In breakout for manifold absolute pressure sensor. See Fig. 2.
S105 (4.7L)	In left side of engine harness. See Fig. 3.
S106 (4.0L)	In breakout for oxygen sensors. See Fig. 2.
S106 (4.7L)	Right rear of engine compartment.
S107 (4.0L)	At left side engine harness, top left side of engine, in fuel injector harness. See Fig. 1.
S107 (4.7L)	At left side engine harness, at top of engine, in fuel injector harness. See Fig. 3.
S108 (4.0L)	Near breakout for C103, at top of engine, in fuel injector harness. See Fig. 1.
S108 (4.7L)	Near breakout for C103, at top of engine, in fuel injector harness. See Fig. 4.
S109 (4.0L)	In right side engine harness, at top of engine, in fuel injector harness. See Fig. 1.
S109 (4.7L)	Near breakout for coil No. 6. See Fig. 4.
S110	Near breakout for oxygen sensor.
S111	Near breakout for 2/2 downstream oxygen sensor.
S112 (4.0L)	In engine harness near breakout for C102, C103 & C104. See Fig. 2.
S112 (4.7L)	In engine harness near breakout for C102, C103 & C104.
S113	Near transmission control module. See Fig. 4.
S114	Near transmission control module. See Fig. 4.
S115	Near transmission control module. See Fig. 4.
S116	Near transmission control module. See Fig. 4.
S117	Near transmission control module. See Fig. 4.
S118 (4.7L)	Between injector No. 4 & No. 6.
S119	In breakout for crankshaft position sensor.
S120	In breakout for crankshaft position sensor.
S121	Left side engine harness. See Fig. 3.
S122 (4.0L)	At rear of engine, on top of transmission engine harness, near C102, C103 & C104. See Fig. 2.
S122 (4.7L)	At rear of engine, on top of transmission engine harness, near C102, C103 & C104. See Fig. 9.
S124	In left side engine harness. See Fig. 3.
S125	Near breakout for powertrain control module C3.
S126	Right rear corner of engine compartment. See Fig. 11.
S127	Right rear corner of engine compartment. See Fig. 11.
S128	Right rear corner of engine compartment. See Fig. 11.
S129	Right rear corner of engine compartment. See Fig. 11.
S130	In breakout for C103.
S131	Near power distribution center. See Fig. 11.
S132	Near power distribution center. See Fig. 11.
S133	Near breakout for battery temperature sensor.
S134	Near breakout for G106.
S151	In headlight assembly.
S200	At lower dash.
S201	At lower dash.
S202	At lower dash.
S203	At lower dash.
S204	At lower dash.
S205	At lower dash.
S206	At lower dash.
S207	At upper dash.
S208	At upper dash.
S209	At upper dash.
S210	At upper dash.
S211	At upper dash.
S212	At upper dash.
S213	Near steering wheel.
S214	Near steering wheel.
S215	Near remote radio switches.
S216	Near remote radio switches.
S300	At left "B" pillar.
S301	In breakout for C304.
S302	At left "B" pillar.
S303	At left "B" pillar.
S303	At left "B" pillar.
S304	At left "B" pillar.
S305	At left "B" pillar.
S306	Near left taillights.
S307	Near left taillights.
S309	Near left taillights.
S310	Near left taillights.
S311	Near left taillights.
S312	In front body harness, left side of dash.
S313	In front body harness, left side of dash.
S314	In front body harness, left side of dash.
S315	In front body harness, left side of dash.
S316	In body harness, left side of dash.
S317	In body harness, right side of dash.
S318	In body harness, right side of dash.
S324	In body harness at right kick panel.
S325	In breakout for anti-lock controller.
S326	In body harness at right kick panel.
S327	In body harness at right kick panel.
S328	In body harness at right kick panel.
S329	In body harness, in front door area.
S330	In body harness, in front door area.
S331	In body harness, at "B" pillar.
S332	In body harness, at "B" pillar.
S334	In breakout for power amplifier.
S336	At driver door.
S338	At passenger door.
S339	At passenger door.
S340	At passenger door.
S341	Under passenger seat.
S342	Under passenger seat.
S345	Under left handle light.
S346	At headliner.
S347	At headliner.
S348	In headliner, near breakout for mirror.
S349	At headliner.
S351	Near breakout for seat belt switch.
S352	Near breakout for seat belt switch.
S353	Under driver seat.
S355	Under driver seat.
S356	At bottom of left rear door.
S357	At bottom of right rear door.
S401	In liftgate harness.
S402	In liftgate harness.
S403	In liftgate harness.
S404	In liftgate harness.
S406	In trailer tow harness.
S407	In trailer tow harness.
S408	Near connector C310.
S409	Near connector C310.
S410	At trailer tow connector.
S411	Near license lights.
S412	Near license lights.