Mercedes-Benz S420 1998 - 1998 MERCEDES-BENZ S320, S420, S500 & S600

Mercedes-Benz S420 1998 - BUZZERS, RELAYS & TIMERS

Mercedes-Benz S420 1998 BUZZERS, RELAYS & TIMERS

Component	Component Location
Combination Relay	On left rear corner of engine compartment.
High Pressure/Return Pump Relay	On left rear of engine compartment.

Mercedes-Benz S420 1998 - CIRCUIT PROTECTION DEVICES

Mercedes-Benz S420 1998 CIRCUIT PROTECTION DEVICES

Component	Component Location
Fuse Box	On left rear corner of engine compartment. See Fig. 1 .
Rear Fuse Box	In luggage compartment, behind right trim panel. See Fig. 1 .

Mercedes-Benz S420 1998 - CONTROL UNITS

Mercedes-Benz S420 1998 CONTROL UNITS

Component	Component Location
AIR Control Module	On left front of engine compartment, on frame rail. See Fig. 1 .
AIR Relay Module	On left rear of engine compartment.
Anti-Theft Alarm (ATA) Control Module	On right side of luggage compartment, behind trim panel. See Fig. 1 .
ASR/ETS/ESP Hydraulic Unit	On left side of engine compartment.
ASR/SPS Control Module	In module box, on right rear of engine compartment. See Fig. 1 .
Base Module (BM)	In module box, on right rear of engine compartment. See Fig. 1 .
CF Relay Module	In left rear of engine compartment.
DAS Control Module	Behind instrument cluster.
Daytime Running Light Control Module	Behind center of dash.
Engine Control Module (ME-SFI) (S320 & S420 & S500)	In module box, on right rear of engine compartment. See Fig. 1 .
Engine Control Module (ME-SFI) (Left) (S600)	In module box, on right rear of engine compartment. See Fig. 1 .
Engine Control Module (ME-SFI) (Right) (S600)	In module box, on right rear of engine compartment. See Fig. 1 .
ESP/SPS Control Module	In module box, on right rear of engine compartment. See Fig. 1 .
External Light Failure Monitoring Module	In left rear of engine compartment.
Fuel Pump (FP) Relay Module	On right side of trunk. See Fig. 1 .
HCS Relay Module	In left rear of engine compartment.
Headlight Range Control Module	In front of passenger's footwell.
Horn Relay Module	In left rear of engine compartment.
HS Control Modules (2) (Front & Rear)	Beneath rear seat.
MSC Control Module	On front of passenger's footwell.
Parktronic System (PTS) Control Module	Below right rear seat. See Fig. 1 .
Rear Window Defrost Relay Module	On right rear of trunk.
Remote Control (RCL) Module	On right side of luggage compartment, behind trim panel.
Seat Belt Extender Control Module	Behind left rear side cover panel.
Seat Belt Reminder Control Module	Behind left center of dash.
SRS Control Module	Beneath front of center console. See Fig. 1 .
Starter Lock-Out Relay Module	In left rear corner of engine compartment.
Transmission Control Module	In module box, on right rear of engine compartment. See Fig. 1 .

Mercedes-Benz S420 1998 - MOTORS

Mercedes-Benz S420 1998 MOTORS

Component	Component Location
AIR Pump	On lower right front of engine.
ASR/ESP Charging Pump	In left front fender, behind molding.
Automatic Antenna	On left side of trunk.
Auxiliary Fans (2)	On front of engine compartment.
Electronic Accelerator (EA)/ Cruise Control (CC)/ Idle Speed Control (ISC) Actuator (S320)	On left side of engine beneath intake manifold.
Electronic Accelerator (EA)/ Cruise Control (CC)/ Idle Speed Control (ISC) Actuator (S420 & S500)	On top center of engine.
Electronic Accelerator (EA)/ Cruise Control (CC)/ Idle Speed Control (ISC) Actuator (Left) (S600)	On right side of engine.
Electronic Accelerator (EA)/ Cruise Control (CC)/ Idle Speed Control (ISC) Actuator (Right) (S600)	On left side of engine.
ESC Motor Group	Above accelerator pedal.
Fuel Pump (FP) Assembly	On right underside of vehicle, forward of rear axle.
Rear Blower Motor	Below center console.
Washer Pump	On washer fluid reservoir.
Wiper Motor	On top left of firewall.

Mercedes-Benz S420 1998 - SENDING UNITS & SENSORS

Mercedes-Benz S420 1998 SENDING UNITS & SENSORS

Component	Component Location
ABS Lateral Acceleration Sensor	Beneath center of rear seat.
Body Acceleration Sensor (Left Front)	On top of left front wheel arch.
Body Acceleration Sensor (Right Front)	On top of right front wheel arch.
Body Acceleration Sensor (Right Rear)	On right front of trunk floor.
Camshaft Hall Effect Sensor (S320)	On left front of cylinder head.
Camshaft Hall Effect Sensor (S420 & S500)	On right front of left cylinder head.
Camshaft Hall Effect Sensor (Left) (S600)	On front of right cylinder head.
Camshaft Hall Effect Sensor (Right) (S600)	On front of left cylinder head.
CKP Sensor (S420 & S500)	On left rear of engine.
CKP Sensor (Left) (S600)	On left rear of engine.
CKP Sensor (Right) (S600)	On right rear of engine.
DM Pressure Sensor (S320)	On top left front of engine.
DM Pressure Sensor (S420 & S500)	On top front center of engine.
Engine Coolant Temperature Sensor (S320)	On top left front corner of engine.
Engine Coolant Temperature Sensor (S420 & S500)	On top front of engine.
Engine Coolant Temperature (ECT) Sensor (Left) (S600)	On left front of engine.
Engine Coolant Temperature (ECT) Sensor (Right) (S600)	On right front of engine.
ESP Brake Pressure Sensor	In rear of left front wheel well.
Evaporator Temperature Sensor	On left side of evaporator housing, above accelerator pedal.
Front Axle Level Sensor	On right side of front sway bar.
Front VSS Sensor (Left)	On left front wheel hub assembly.
Front VSS Sensor (Right)	On right front wheel hub assembly.
Fuel Level Sensor	On top, left of fuel tank.
Fuel Tank Pressure Sensor	On top of fuel level sensor, in fuel tank.
Heater Core Temperature Sensors	Behind center of dashboard, below radio.
Hot Film MAF Sensor (S320)	On air intake duct.
Hot Film MAF Sensor (S420 & S500)	On top center of engine.
Hot Film MAF Sensor (Left) (S600)	On right side air intake.
Hot Film MAF Sensor (Right) (S600)	On left side air intake.
IAT Sensor (S320)	On center of engine, in air intake duct.
IAT Sensor (S420 & S500)	On center of engine, in air intake.
IAT Sensor (Left) (S600)	On right side air intake.
IAT Sensor (Right) (S600)	On left side air intake.
In-Car Temperature Sensor (A/C)	In dome light assembly.
Knock Sensor No. 1 (S320)	On left side of engine, toward front of engine.
Knock Sensor No. 1 (S420 & S500)	On lower left side of engine.
Knock Sensor No. 1 (Left) (S600)	On top of engine in left side of valley, toward front of engine.
Knock Sensor No. 1 (Right) (S600)	On top of engine in right side of valley, toward front of engine.
Knock Sensor No. 2 (S320)	On left side of engine, toward rear of engine.
Knock Sensor No. 2 (S420 & S500)	On lower right side of engine.
Knock Sensor No. 2 (Left) (S600)	On top of engine in left side of valley, toward rear of engine.
Knock Sensor No. 2 (Right) (S600)	On top of engine in right side of valley, toward rear of engine.
Left Rear Heater Core Temperature Sensor	In rear of center console.
Left Side Air Bag Sensor	Beneath driver's seat, on crossmember.
Oil Pressure Sensor	On lower left rear of engine.
Outside Temperature Indicator Sensor	In left side of front bumper.
Oxygen Sensor No. 1 (Before TWC) (S320)	On exhaust pipe, before TWC.
Oxygen Sensor No. 1 (Left) (Before TWC) (S420 & S500)	On left exhaust pipe, in front of TWC.
Oxygen Sensor No. 1 (Left) (Before TWC) (S600)	On left exhaust pipe, in front of TWC.
Oxygen Sensor No. 1 (Right) (Before TWC) (S420 & S500)	On right exhaust pipe, in front of TWC.
Oxygen Sensor No. 1 (Right) (Before TWC) (S600)	On right exhaust pipe, in front of TWC.
Oxygen Sensor No. 2 (After TWC) (S320)	On rear of TWC.
Oxygen Sensor No. 2 (Left) (After TWC) (S420 & S500)	On left exhaust pipe, after TWC.
Oxygen Sensor No. 2 (Left) (After TWC) (S600)	On left exhaust pipe, after TWC.
Oxygen Sensor No. 2 (Right) (After TWC) (S420 & S500)	On right exhaust pipe, after TWC.
Oxygen Sensor No. 2 (Right) (After TWC) (S600)	On right exhaust pipe, after TWC.
Parktronic System (PTS) Bumper Sensors (Front) (6)	On front bumper.
Parktronic System (PTS) Bumper Sensors (Rear) (4)	On rear bumper.
Pedal Value Sensor	In right rear of engine compartment.
Pressure Sensor (S420 & S500)	On top front of engine.
Pressure Sensor (Left) (S600)	On left front of engine.
Pressure Sensor (Right) (S600)	On left front of engine.
Rain Sensor	On top center of windshield, integrated with speaker/mirror assembly. See Fig. 1 .
Rear Axle Level Sensor	On rear sway bar, right of differential.
Rear Evaporator Temperature Sensor	In rear of center console.
Rear VSS Sensor (Left)	On left rear wheel hub assembly.
Rear VSS Sensor (Right)	On right rear wheel hub assembly.
Refrigerant Pressure Sensor	In left front corner of engine compartment.
Refrigerant Temperature Sensor	In left front corner of engine compartment.
Right Rear Heater Core Temperature Sensor	In rear of center console.
Right Side Air Bag Sensor	Beneath front passenger's seat, on crossmember.
Steering Angle Sensor	In top of steering column.
Sun Sensor	Top center of dash.
Yaw Rate Sensor	On left side of trunk. See Fig. 1 .

Mercedes-Benz S420 1998 - SOLENOIDS & SOLENOID VALVES

Mercedes-Benz S420 1998 SOLENOIDS & SOLENOID VALVES

Component	Component Location
Adjustable Camshaft Timing Solenoid (S320)	On left front of engine.
Adjustable Camshaft Timing Solenoid (Left) (S420 & S500)	On left front of engine.
Adjustable Camshaft Timing Solenoid (Right) (S420 & S500)	On right front of engine.
Adjustable Camshaft Timing Solenoid (Left) (S600)	On left front of engine.
Adjustable Camshaft Timing Solenoid (Right) (S600)	On right front of engine.
AIR Pump Switchover Valve (S320)	On top center front of engine.
AIR Pump Switchover Valve (S420 & S500)	On top center front of engine.
AIR Pump Switchover Valve (S600)	On right side of engine, near MAF sensor.
Seat Belt Comfort Feature Solenoid (Left & Right)	In bottom of respective "B" pillar.

Mercedes-Benz S420 1998 - SWITCHES

Mercedes-Benz S420 1998 SWITCHES

Component	Component Location
ECL Switch	On bottom of coolant reservoir.
Engine Hood Switch	On right front of engine compartment.
Heated Washer Thermo Switch	On underside rear of hood.
Kickdown Switch	Under accelerator pedal.
Oil Level Switch (S320)	On left side of oil pan.
Oil Level Switch (S420 & S500)	On right side of oil pan.
Oil Level Switch (S600)	On right side of oil pan.
Parking Brake Switch	At top of parking brake assembly.
Stoplight Switch	At top of brake pedal.
Transmission Range Recognition Switch (Voltage Coded)	On gear shift selector assembly.
Trunk Lid Lock Switch	In trunk latch switch.

Mercedes-Benz S420 1998 - MISCELLANEOUS

Mercedes-Benz S420 1998 MISCELLANEOUS

Component	Component Location
Alarm Horn	In right front of engine compartment.
CA Supply Pump	In left front of trunk.
CTEL Transmitter-Receiver	On left side of trunk. See Fig. 1 .
Data Link Connector (DLC) (DTC Readout)	On right side of engine compartment. See Fig. 1 .
Data Link Connector (DLC) (OBD II)	On underdash panel in driver's footwell. See Fig. 1 .
Electrolytic Capacitor (Charging System)	In left side of passenger's footwell.
Electrolytic Capacitor (Rear Defogger)	On right "C" pillar, under trim panel.
Electromagnetic AIR Pump Clutch (S600)	On lower right front of engine.
Heater Supply Unit	In left front of engine compartment.
Left Front Door IR Receiver	In driver's door handle.
Rear Heater Supply Unit	In rear of right front wheel well, in fender.
Right Front Door IR Receiver	In passenger's door handle.
SRS Test Connector	In passenger's footwell.
Trunk Lid IR Receiver	On trunk lid left of lock.

Mercedes-Benz S420 1998 - CONNECTORS

Mercedes-Benz S420 1998 CONNECTORS

Component	Component Location
X1/6	At left kick panel.
X1/7	At right kick panel.
X4 (2-Pin)	At left rear of engine compartment, at fuse & relay box.
X4/5 (1-Pin)	At right side of luggage compartment.
X4/10	At right rear of engine compartment.
X4/17	At left top of left front footwell.
X4/20 (4-Pin)	At left rear of engine compartment, at fuse & relay box.
X4/23 (2-Pin)	Under foot plate, at right front footwell.
X4/28	Under steering column.
X6	Under center of dash.
X8/6	At top front of left front door.
X8/7	At top front of left front door.
X9 (1-Pin)	At left rear of engine compartment.
X11	At left middle of engine compartment.
X11/2 (9-Pin)	At left middle of engine compartment.
X11/3 (9-Pin)	At right rear of engine compartment.
X11/4 (35-Pin)	At right rear of engine compartment.
X11/7 (4-Pin)	At center of heater intake plenum.
X11/13 (12-Pin)	At center of heater intake plenum.
X11/14 (2 or 4-Pin)	At right side of heater intake plenum.
X11/15 (16-Pin)	At right kick panel.
X11/21 (3-Pin)	At right side of heater intake plenum.
X11/22 (16-Pin)	Under left side of dash.
X11/26	At left side of luggage compartment.
X18	At left top of left front footwell.
X20/1	At right top of rear partition panel.
X20/2	At left kick panel.
X20/3 (4-Pin)	At left rear of engine compartment.
X21/1	At left top of left front footwell.
X22/5 (4-Pin)	At right side of heater intake plenum.
X22/8	At right side of left front footwell.
X22/9 (4-Pin)	At right front of left front footwell.
X24 (6-Pin)	At left rear of engine compartment.
X26	At left rear of engine compartment.
X26/2 (36-Pin)	At right side of engine compartment.
X26/27	Behind left side of front bumper.
X27	At right rear of engine compartment.
X27/6	Near coolant reservoir.
X28/4 (2-Pin)	Under steering column.
X28/5 (2-Pin)	Behind steering wheel.
X29/1 (2-Pin)	In glove box.
X29/2 (2-Pin)	Under center of dash.
X29/3	Behind center face vents.
X29/4 (2-Pin)	At left rear of engine compartment.
X33/14 (16-Pin)	Under right front foot plate.
X34/3	In right front door jamb.
X34/5	At right rear door jamb.
X35/1	At left kick panel.
X35/2	At right kick panel.
X35/3	At left "B" pillar.
X35/4	At right "B" pillar.
X35/5 (12-Pin)	At right kick panel.
X35/7 (18-Pin)	At right side of heater intake plenum.
X35/8 (16-Pin)	At right side of heater intake plenum.
X35/15	At right kick panel.
X35/16 (8-Pin)	At right side of heater intake plenum.
X35/20 (12-Pin)	At right kick panel.
X35/21	Behind right headlamp.
X35/22 (1-Pin)	At left kick panel.
X35/26	Under right front foot plate.
X35/27	Under right side of dash.
X35/28	At right rear of luggage compartment.
X35/35	At left kick panel.
X35/51 (4-Pin)	At right kick panel.
X35/58 (10-Pin)	At left rear of engine compartment.
X35/59	Under right front foot plate.
X35/60	At right kick panel.
X35/61	Under right front foot plate.
X35/62	Under right front foot plate.
X35/63	In control module box.
X35/64 (18-Pin)	Under right front foot plate.
X35/65	At left rear of engine compartment.
X35/66	Under right front foot plate.
X36/3 (2-Pin)	Under rear seat, at right side of propeller shaft tunnel.
X39/3 (4-Pin)	Under center of dash.
X39/4 (4-Pin)	Under left front of center console.
X39/10 (12-Pin)	Under right front of center console.
X39/14	Under right front of center console.
X39/36 (4-Pin)	Under center console, left of shifter lever.
X42/13 (1-Pin)	Behind radio.
X42/15	At right front of engine compartment.
X43 (3-Pin)	Behind center of dash.
X44/4	Under rear seat cushion.
X46/5 (3-Pin)	At right side of heater intake plenum.
X47/2	At right rear of engine.
X47/3	At right rear of engine.
X47/4	At right rear of engine.
X49/2 (10-Pin)	At right side of left front footwell.
X49/4 (1-Pin)	In fuse & relay box.
X50/1 (4-Pin)	At right side of left front footwell.
X54/7	Behind left side of dash.
X55/3	Under front of left front seat.
X55/4	Under front of left front seat.
X59/1 (2-Pin)	At left middle of engine compartment.
X62/6	At right rear of engine compartment.
X62/7	At left side of engine compartment.
X62/8	Under right rear of vehicle, near fuel filter.
X62/14	At left front wheel.
X62/15	At right front wheel.
X72/1 (2-Pin)	Under center of dash.
X83/1 (2-Pin)	At left front of right front footwell.
X83/8 (1-Pin)	At left side of engine compartment.
X83/13	Under steering column.
X85/1 (2-Pin)	At left rear of engine compartment.
X87/1	At right rear of engine compartment.
X88/2	Under right front foot plate.
X96/1 (4-Pin)	At right side of heater intake plenum.

Mercedes-Benz S420 1998 - GROUNDS

Mercedes-Benz S420 1998 GROUNDS

Component	Component Location
W1	Behind instrument cluster.
W3	At left front wheelwell, near ignition coil. See Fig. 1 .
W3/1	At right front wheelwell, near ignition coil. See Fig. 1 .
W3/2	At left side of engine compartment. See Fig. 1 .
W3/3	At right side of engine compartment. See Fig. 1 .
W6	At left side of luggage compartment. See Fig. 1 .
W6/1	At left rear of luggage compartment. See Fig. 1 .
W7/1	At right rear of luggage compartment. See Fig. 1 .
W9/1	Behind left headlamp. See Fig. 1 .
W9/2	Behind right headlamp. See Fig. 1 .
W10	At right rear of luggage compartment. See Fig. 1 .
W11	At top middle of engine. See Fig. 1 .
W11/1	At left rear bottom of engine. See Fig. 1 .
W12	In front of shifter lever. See Fig. 1 .
W13/1	Under left "C" pillar trim. See Fig. 1 .
W14	At left side of engine compartment. See Fig. 1 .
W15	At right kick panel. See Fig. 1 .
W15/1	At right kick panel. See Fig. 1 .
W16	At right side of engine compartment. See Fig. 1 .
W16/2	At left side of engine compartment. See Fig. 1 .
W17	Under right side of rear seat. See Fig. 1 .
W26	In front of shifter lever. See Fig. 1 .
W28/1	On sill panel, below left front door. See Fig. 1 .
W28/2	On sill panel, below right front door. See Fig. 1 .
W29	At left "A" pillar. See Fig. 1 .
W29/1	At left "A" pillar. See Fig. 1 .
W29/2	At right kick panel. See Fig. 1 .
W29/4	At right "C" pillar. See Fig. 1 .
W30	At left rear bottom of engine. See Fig. 1 .
W31	At left side of luggage compartment. See Fig. 1 .
W36	At right kick panel. See Fig. 1 .

Mercedes-Benz S420 1998 - SPLICES

Mercedes-Benz S420 1998 SPLICES

Component	Component Location
Z3	In left interior harness, at sill panel, under left rear door.
Z3/1	In dash harness, at center of dash.
Z3/4	In left engine compartment harness, at fuse & relay box.
Z3/5	In dash harness, at center of dash.
Z3/7	In dash harness, at center of dash.
Z3/8	In dash harness, at center of dash.
Z3/11	In dash harness, at center of dash.
Z3/12	In left interior harness, at sill panel, under left front door.
Z3/13	In left interior harness, at sill panel, under left "B" pillar.
Z3/29	In right interior harness, at sill panel, below right rear door.
Z3/31	In body harness, behind center console.
Z4/3	In luggage compartment harness, on left side of compartment.
Z6/8	In right engine harness, at right rear of engine compartment.
Z6/16	In dash harness, at center of dash.
Z6/18	In left engine compartment harness, at middle of engine.
Z6/21	In left engine compartment harness, at front of fuse & relay box.
Z6/24	In left engine compartment harness, at middle of engine.
Z6/25	In left engine compartment harness, at middle of engine.
Z7/1	In right interior harness, at sill panel, below right rear door.
Z7/19	In left engine compartment harness, at fuse & relay box.
Z7/21	In dash harness, at center of dash.
Z7/26	In body harness, under left front seat.
Z7/35	In right engine harness, at right rear of engine compartment.
Z7/36	In right engine harness, at right rear of engine compartment.
Z7/38	In left engine compartment harness, at middle front of engine.
Z7/39	In left engine compartment harness, at middle front of engine.
Z8	In left engine compartment harness, at front of fuse & relay box.
Z20/2	In luggage compartment harness, on left side of compartment.
Z20/3	In luggage compartment harness, on left side of compartment.
Z20/4	In luggage compartment harness, on left side of compartment.
Z20/5	In luggage compartment harness, on left side of compartment.
Z20/10	In luggage compartment harness, on left side of compartment.
Z20/16	In luggage compartment harness, on left side of compartment.
Z21/2	In right interior harness, at sill panel, below right "B" pillar.
Z21/3	In right interior harness, at sill panel, below right rear door.
Z25/3	In luggage compartment harness, on left side of compartment.
Z28/2	In luggage compartment harness, on left side of compartment.
Z28/18	In luggage compartment harness, on left side of compartment.
Z29	In left engine compartment harness, at fuse & relay box.
Z30/1	In left engine compartment harness, at fuse & relay box.
Z30/2	In left engine compartment harness, at fuse & relay box.
Z30/5	In left interior harness, at sill panel, under left rear door.
Z35/1	In left interior harness, at sill panel, under left rear door.
Z35/2	In left interior harness, at sill panel, under left rear door.
Z37/2	In right engine harness, at right rear of engine compartment.
Z37/3	In right engine harness, at right rear of engine compartment.
Z38	In right interior harness, at sill panel, below right rear door.
Z81	In body harness, under left front seat.
Z82/3	In right interior harness, at sill panel, below right rear door.
Z85/1	In right engine harness, at right rear of engine compartment.
Z88/1	In right interior harness, at sill panel, below right "B" pillar.
Z94	In right engine harness, at right rear of engine compartment.
Z99/1	In right engine harness, at right rear of engine compartment.

Mercedes-Benz S420 1998 - COMPONENT LOCATION GRAPHICS

NOTE:

Fig.res may show multiple component locations. - appropriate table for proper figure references.

Fig. 1: Mercedes-Benz S420 1998 - Component Locations - Vehicle Overview