Mercedes-Benz 190E 1990 - ELECTRICAL COMPONENT LOCATOR 1988-91 MERCEDES-BENZ ELECTRICAL COMPONENT LOCATOR

Mercedes-Benz 190E 1990 - BUZZERS, RELAYS & TIMERS

Mercedes-Benz 190E 1990 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
A/C Compressor Relay	In fuse/relay block.
A/C Power Relay	In fuse/relay block. See Fig. 1 .
ABS Return Pump Relay	On left side of engine compartment.
ABS Solenoid Valve Relay	On left side of engine compartment.
Antenna Motor Relay	Behind left rear wheelwell, inside motor.
Auxiliary Fan Relay	In auxiliary relay block, in front of fuse/relay block. See Fig. 2 .
Combination Relay (Turn Signal, Rear Defogger, Windshield Wiper)	In fuse/relay block.
Dome Light Delay Relay	Under center of dash, near A/C vacuum valves.
Fuel Pump Relay (See View "C")	On right side of firewall, near battery. See Fig. 3 .
Fuel Pump Relay	On right side of firewall, near battery. See Fig. 4 .
Glow Plug Control Relay	In engine compartment, on left wheelwell.
Idle Control Protection Relay	In engine compartment, behind battery.
ABS Overvoltage Protection Relays	In fuse/relay block.
CIS-E Fuel Injection Overvoltage Protection Relays (See View "D")	On right side of firewall, near battery. See Fig. 3 & Fig. 4 .
Power Seat Relays	In auxiliary relay block, in front of fuse/relay block. See Fig. 1 .
Power Window Relay	In fuse/relay block. See Fig. 1 .

Mercedes-Benz 190E 1990 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
A/C Blower Motor In-Line Fuse	On left side of firewall, behind shock tower.
Fuse/Relay Block	At left rear corner of engine compartment. See Fig. 1 .

Mercedes-Benz 190E 1990 CONTROL UNITS LOCATION

Component	Location
A/C Protective Cut-Out Unit	On left side of engine compartment.
ABS Control Unit	In engine compartment, behind battery.
CIS-E Fuel Injection Control Unit (See View "A")	On right side of firewall, near battery. See Fig. 3 .
Cruise Control Unit	Under right side of dash, behind kick panel.
EGR Control Unit	Above right side of passenger's footwell.
Electronic Idle Speed Controller (Diesel)	On right side of firewall, near battery.
Heated Seats Control Units	Behind cover, under left and right footwells.
Illumination Control Unit	Under left side of dash, below instrument cluster.
Key/Light Warning Module	To right of parking brake support.
Overvoltage Protection Control Unit	On left side of engine compartment.
Power Seat Control Unit	Under driver's seat.
SRS Control Unit/Sensor	Under center console, forward of shifter, bolted to transmission tunnel. See Fig. 5 .
Switch Control Unit	On right side of firewall.
Transistorized Ignition Control Unit	On front left side of engine compartment.
Wiper Interval Control Module	Behind left side of instrument cluster.

Mercedes-Benz 190E 1990 SENDING UNITS & SENSORS LOCATION

Component	Location
A/C Ambient Temperature Sensor	On top of A/C evaporator housing.
A/C In-Car Temperature Sensor	On center of roof, near dome light.
A/C RPM Sensor (Diesel)	On left side of bellhousing.
Airflow Sensor (See View "G")	On top of intake manifold, next to fuel distributor. See Fig. 3 .
ABS Wheeel Sensors	On each wheel hub.
Brake Fluid Level Sensor	In brake fluid reservoir.
Brake Pad Wear Sensors	In each front brake pad.
Coolant Temperature Sensor
2.3L (See View "F")	On intake manifold, in front of fuel distributor. See Fig. 3 .
2.6L (1988 - See View "F")	On left rear corner of cylinder head. See Fig. 3 .
Cruise Control Speed Sensor	On back of speedometer.
Intake Air Temperature Sensor	On engine, next to fuel distributor.
Oil Temperature Sending Unit	On oil filter housing.
Outside Temperature Sensor	Behind front license plate holder.
Oxygen Sensor (See View "L")	On exhaust manifold. See Fig. 3 .

Mercedes-Benz 190E 1990 MOTORS LOCATION

Component	Location
A/C-Heater Blower Motor	Above passenger's footwell.
Central Locking Pump	Under right rear seat cushion.
Fuel Pump	In front of left rear axle.
Heater Auxiliary Coolant Pump	In heater coolant return hose.
Power Antenna Motor	In trunk, above left wheelwell.
Sun Roof Motor	In trunk, above left wheelwell.
Windshield Washer Pump	In engine compartment, in windshield washer reservoir.

Mercedes-Benz 190E 1990 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
A/C Switch-Over Valve	Above passenger's footwell, by blower motor.
A/C Solenoid Valves	On left side of engine compartment.
Cold Start Valve	In front of fuel distributor.
EGR Solenoid Valve	On right side of engine compartment.
EGR Switch-Over Valve	Under intake manifold.
Kickdown Solenoid (Auto. Trans.)	On front left side of transmission.

Mercedes-Benz 190E 1990 SWITCHES LOCATION

Component	Location
A/C High/Low Pressure Switches	On receiver-drier.
A/C Reciever-Drier Temperature Switch	On receiver-drier.
A/C Temperature Switch	On top of thermostat housing.
Back-Up Light Switch (Man. Trans.)	At base of shift lever.
Back-Up Light Switch (Auto. Trans.)	On left side of transmission.
Brake/Stoplight Switch	On top of brake pedal support.
Cruise/Clutch Switch	On clutch pedal support.
Deceleration Cut-Off Switch (See View "J")	On top of intake manifold, on throttle body linkage. See Fig. 3 .
Engine Speed Switch	In engine compartment, on left wheelwell.
Kickdown Switch (Auto. Trans.)	In engine compartment, on right wheelwell.
Low Oil Level Switch	On left side of oil pan.
Microswitch (Diesel)	On throttle body.
Parking Brake Switch	On parking brake support.
Throttle Valve Switch (See View "K")	On intake manifold, at base of throttle body. See Fig. 3 .
Thermo Time Switch	On front right side of engine block.

Mercedes-Benz 190E 1990 CHECK/TEST CONNECTORS LOCATION

Component	Location
Diagnostic Connectors
All Models (See View "M")	In engine compartment, on left front fender. See Fig. 3 .
California Models (See View "E")	On right side of firewall, near battery. See Fig. 3 .

Mercedes-Benz 190E 1990 MISCELLANEOUS LOCATION

Component	Location
A/C Heater Blower Motor Resistors	In fresh air duct, above passenger's footwell.
A/C Feedback Potentiometer	On top of A/C-heater box.
ABS Hydraulic Unit	On front left side of engine compartment.
Altitude Correction Capsule (See View "B")	On right side of firewall, behind battery. See Fig. 3 .
Auxiliary Relay Block	In engine compartment, in front of fuse/relay block.
Central Locking Actuator	In driver's door panel.
Cruise Control Actuator	Under intake manifold.
Electro-Hydraulic Actuator (See View "H")	On top of intake manifold, to rear of fuel distributor. See Fig. 3 .
Idle Speed Air Valve
2.3L (See View "I")	On top of intake manifold, to rear of fuel distributor. See Fig. 3 .
2.6L (See View "I")	On top of intake manifold, in front of fuel distributor. See Fig. 3 .
Ignition Module	In engine compartment, in front of left front fender.
SRS Control Light	On instrument panel. See Fig. 5 .
SRS Energy Accumulator	Under passenger's footwell. See Fig. 5 .
SRS Emergency Tensioning Retractor	On left and right inner door pillar posts. See Fig. 5 .
SRS Voltage Converter	Under left side of dash, above pedal assembly. See Fig. 5 .