Diagram sections — 28 (70 total)
AIR CONDITIONING ANTI-LOCK BRAKES ANTI-THEFT COMPUTER DATA LINES CRUISE CONTROL DEFOGGERS ENGINE PERFORMANCE EXTERIOR LIGHTS GROUND DISTRIBUTION HEADLIGHTS HORN INSTRUMENT CLUSTER INTERIOR LIGHTS MEMORY SYSTEMS NAVIGATION POWER DISTRIBUTION POWER DOOR LOCKS POWER MIRRORS POWER SEATS POWER TOP/SUNROOF POWER WINDOWS RADIO SHIFT INTERLOCK STARTING/CHARGING SUPPLEMENTAL RESTRAINTS TRANSMISSION WARNING SYSTEMS WIPER/WASHER
AIR CONDITIONING Automatic A/C Wiring Diagram (1 of 2) for Mercury Mountaineer 2003 List of elements for Automatic A/C Wiring Diagram (1 of 2) for Mercury Mountaineer 2003: 56 (1: microprocessor) (2: pats indicator) (air conditioning harness, near breakout to temperature blend door actuator) (in main harness, near breakout to sunload sensor) s219 (near breakout to central junction box) A/c clutch relay (in battery junction box) A/c indicator diode (in battery junction box) Ambient air temperature sensor (right front of engine compt, near radiator support) Battery junction box (bjb) (left side of engine compt, at fender apron) Blower motor relay C220a C228a C228b C270b C270e C270h C3008e Central junction box (cjb) (behind left side of dash) Central security module (behind right rear seat) Computer data lines system Driver temperature blend door actuator Electronic automatic temperature control (eatc) module (under left dash panel) Exterior lights system Front blower motor (behind center of dash) Front blower motor speed controller (behind center of dash) Fuse 10 10a Fuse 15 15a Fuse 20 5a Fuse 30 5a Fuse 36 40a Fuse 37 15a Fuse 7 15a G101 (left front of engine compartment) G200 (at right ``a" pillar) G206 (behind center of dash) G300 (at left ``a" pillar) Hot at all times Hot in run and start Hot in start or run In-vehicle temperature sensor (behind top left of dash) Instrument cluster Interior lights system J/c 1 J/c 2 (in battery junction box) Micropro- cessor Passenger temperature blend door actuator Remote solenoid assembly (behind center of dash) S232 S233 (in main harness, near breakout to data link connector) S242 S243 S247 (in main harness, near breakout to central junction box) S317 (in window regulator jumper assembly, near breakout to left rear speaker) Seats system Sunload sensor (at center of dash) Tan Automatic A/C Wiring Diagram (2 of 2) for Mercury Mountaineer 2003 List of elements for Automatic A/C Wiring Diagram (2 of 2) for Mercury Mountaineer 2003: 61 (at breakout to roof opening panel switch) (in air conditioning harness, near breakout to c3007) s341 (in interior illumination harness, at breakout to c340) s908 A/c clutch cycling pressure switch (right side of engine compartment) A/c clutch solenoid (at left side of engine) A/c high pressure switch (left front of engine compt) Air bag sliding contact Audio/ climate control switch Aux blower motor control Auxiliary a/c relay (behind left side of rear seats) Auxiliary blower motor (left side of cargo area) Auxiliary blower motor resistor assembly (in left rear cargo area) Battery junction box (bjb) (left side of engine compt, at fender apron) Blower motor high Blower motor resistor high C175a C218a C270a C938a C938b C940a C940b Central junction box (cjb) (behind left side of dash) Cruise control system Engine harness, near breakout to a/c clutch cycling pressure switch) Fan dn Fan up Fuse 25 5a Fuse 33 30a G101 (left front of engine compartment) G104 (right rear of engine compt) G400 (left rear of vehicle) G401 (at right ``d" pillar) Ground Harness, at breakout to c340) Hot at all times Hot in start or run Illumination Instrument illumination input Interior lights system Nca Powertrain control module (pcm) (at right side engine bulkhead) Rear a/c control module (front) (in roof panel) Rear a/c control module (rear) (in roof panel) Rear a/c front to rear a/c rear Rear blower to aux a/c module Rear mode door actuator (left side, behind rear seats) Rear mode door actuator feed Rear mode door actuator return S326 S341 (in air conditioning harness, near breakout to c3007) S903 (near breakout to c340) S906 (in interior illumination harness, at breakout to c340) S907 (at breakout to c340) S910 Tan Temp blend door actuator return Temp dn Temp up Temperature blend door actuator (below left rear cargo area window) Voltage (start and run) Manual A/C Wiring Diagram, with Sliding Roof (1 of 2) for Mercury Mountaineer 2003 List of elements for Manual A/C Wiring Diagram, with Sliding Roof (1 of 2) for Mercury Mountaineer 2003: 79 (in main harness, near breakout to central junction box) s249 (in main harness, near breakout to function selector switch assembly) (left front of engine compartment) (near breakout to sunload (near breakout to temperature blend door actuator) 87a A/c clutch cycling pressure switch (right side of engine compartment) A/c clutch relay A/c clutch solenoid (at left side of engine) A/c demand signal A/c high pressure switch (left front of engine compt) A/c indicator diode Battery junction box (bjb) (left side of engine compt, at fender apron) Blend dr output Blower motor relay Blower motor switch Blower motor to blower switch C175a C220a C270a C270b C270e C270h C294a C294b C294c Central junction box (cjb) (behind left side of dash) Def Except base Exterior lights input Exterior lights system Floor Floor/vent Front blower motor (behind center of dash) Front blower motor resistor assembly (behind center of dash) Function selector switch assembly Fuse 10 10a Fuse 16 5a Fuse 30 5a Fuse 36 40a Fuse 37 15a Fuse 7 15a G101 G101 (left front of engine compartment) G104 (right rear of engine compt) G200 (at right ``a" pillar) G206 (behind center of dash) G300 (at left ``a" pillar) Ground Ground c294b High High speed fan control relay (behind center of dash) Hot at all times Hot in start or run Illlumination Instrument cluster Interior lights system J/c 2 Low Max Med 1 Med 2 Medium Micropro- cessor Mix Mode switch Off Powertrain control module (pcm) (at right side engine bulkhead) Rear window defrost sw S216 S219 (in main harness, near breakout to sunload sensor) S222 S240 (air conditioning harness, near breakout to temperature blend door actuator) S241 S317 (in window regulator jumper assembly, near breakout to left rear speaker) Sensor) Temperature blend door actuator (below left rear cargo area window) Vent Vpwr Manual A/C Wiring Diagram, with Sliding Roof (2 of 2) for Mercury Mountaineer 2003 List of elements for Manual A/C Wiring Diagram, with Sliding Roof (2 of 2) for Mercury Mountaineer 2003: 36 (in air conditioning harness, near breakout to c3007) s339 (in air conditioning harness, near breakout to c3007) s341 (in interior illumination harness, near breakout to c340) Aux blower to aux a/c module Auxiliary a/c relay (behind left side of rear seats) Auxiliary blower motor (left side of cargo area) Auxiliary blower motor resistor assembly (in left rear cargo area) Battery junction box (bjb) (left side of engine compt, at fender apron) C270a C938a C938b C940a Central junction box (cjb) (behind left side of dash) Fuse 25 5a Fuse 33 30a G400 (left rear of vehicle) G401 (at right ``d" pillar) Ground Hot at all times Hot in start or run Illumination Instrument illumination input Interior lights system Rear a/c control module (front) (in roof panel) Rear a/c control module (rear) (in roof panel) Rear a/c front to rear a/c rear Rear blower to aux a/c module Rear mode door actuator (left side, behind rear seats) Rear mode door actuator feed Rear mode door actuator return S341 (in air conditioning harness, near breakout to c3007) S903 S908 (in interior illumination harness, at breakout to c340) Temp blend door actuator return Temperature blend door actuator (below left rear cargo area window) Voltage (start and run) Manual A/C Wiring Diagram, without Sliding Roof (1 of 2) for Mercury Mountaineer 2003 List of elements for Manual A/C Wiring Diagram, without Sliding Roof (1 of 2) for Mercury Mountaineer 2003: 79 (in main harness, near breakout to central junction box) s249 (in main harness, near breakout to function selector switch assembly) (left front of engine compartment) (near breakout to sunload (near breakout to temperature blend door actuator) 87a A/c clutch cycling pressure switch (right side of engine compartment) A/c clutch relay A/c clutch solenoid (at left side of engine) A/c demand signal A/c high pressure switch (left front of engine compt) A/c indicator diode Battery junction box (bjb) (left side of engine compt, at fender apron) Blend dr output Blower motor relay Blower motor switch Blower motor to blower switch C175a C220a C270a C270b C270e C270h C294a C294b C294c Central junction box (cjb) (behind left side of dash) Def Except base Exterior lights input Exterior lights system Floor Floor/vent Front blower motor (behind center of dash) Front blower motor resistor assembly (behind center of dash) Function selector switch assembly Fuse 10 10a Fuse 16 5a Fuse 30 5a Fuse 36 40a Fuse 37 15a Fuse 7 15a G101 G101 (left front of engine compartment) G104 (right rear of engine compt) G200 (at right ``a" pillar) G206 (behind center of dash) G300 (at left ``a" pillar) Ground Ground c294b High High speed fan control relay (behind center of dash) Hot at all times Hot in start or run Illlumination Instrument cluster Interior lights system J/c 2 Low Max Med 1 Med 2 Medium Micropro- cessor Mix Mode switch Off Powertrain control module (pcm) (at right side engine bulkhead) Rear window defrost sw S216 S219 (in main harness, near breakout to sunload sensor) S222 S240 (air conditioning harness, near breakout to temperature blend door actuator) S241 S317 (in window regulator jumper assembly, near breakout to left rear speaker) Sensor) Temperature blend door actuator (below left rear cargo area window) Vent Vpwr Manual A/C Wiring Diagram, without Sliding Roof (2 of 2) for Mercury Mountaineer 2003 List of elements for Manual A/C Wiring Diagram, without Sliding Roof (2 of 2) for Mercury Mountaineer 2003: 46 (in air conditioning harness, near breakout to c3007) s341 (in interior illumination harness, at breakout to c340) (in interior illumination harness, at breakout to c340) s907 (in interior illumination harness, near breakout to c340) (in pia harness, at breakout to roof opening panel switch) s910 (left rear of vehicle) Auxiliary a/c relay (behind left side of rear seats) Auxiliary blower motor (left side of cargo area) Auxiliary blower motor resistor assembly (in left rear cargo area) Battery junction box (bjb) (left side of engine compt, at fender apron) Blower motor high Blower motor relay control Blower motor resistor high C270a C938a C938b C940a C940b Central junction box (cjb) (behind left side of dash) Fuse 25 5a Fuse 33 30a G400 G400 (left rear of vehicle) G401 (right ``d" pillar) Ground Hot at all times Hot in start or run Illumination Instrument illumination input Interior lights system Rear a/c control module (front) (in roof panel) Rear a/c control module (rear) (in roof panel) Rear a/c front to rear a/c rear Rear blower to aux a/c module Rear mode door actuator (left side, behind rear seats) Rear mode door actuator feed Rear mode door actuator return S326 S339 (in air conditioning harness, near breakout to c3007) S341 (in air conditioning harness, near breakout to c3007) S903 S906 S908 (in interior illumination harness, at breakout to c340) Temp blend door actuator return Temperature blend door actuator (below left rear cargo area window) Voltage (start and run)
ANTI-LOCK BRAKES Anti-lock Brakes Wiring Diagram, with IVD for Mercury Mountaineer 2003 List of elements for Anti-lock Brakes Wiring Diagram, with IVD for Mercury Mountaineer 2003: 54 (in dash panel to (left front of engine compt) g101 Abs control module (left front side of engine compt) Abs test connector (at left side of engine compartment) Battery junction box (bjb) (left side of engine compartment, at fender apron) Brake booster sensor (on front of brake booster) Brake fluid level switch (mounted on right side of master cylinder) Brake pedal position switch (above brake pedal) Breakout to left horn) C175a C270a C270b C270d C270h C281b Central junction box (cjb) (behind left side of dash) Computer data lines system Engine harness, near Exterior lights system Four-wheel drive control module (under passenger dash panel) Fuse 10a Fuse 15a Fuse 30a Fuse 40a Fuse 7.5a G101 (left front of engine compt) Gnd Hot at all times Hot in start or run Interior lights system Left front wheel speed sensor Left rear wheel speed sensor Powetrain control module (pcm) (at right side engine bulkhead) Primary brake pressure sensor (on master cylinder) Red Red/ pnk Red/pnk Redundant pedal switch (under left side dash panel) Right front wheel speed sensor Right rear wheel speed sensor S120 (near breakout to left horn) S127 (near breakout to a/c clutch cycling pressure switch) S171 S175 S176 S179 (in dash panel to engine harness, near breakout to windshield wiper motor) S264 Secondary brake pressure sensor (on brake booster) Steering position sensor Tan Traction control switch Vbatt Vpwr Yaw velocity sensor (below center console) Anti-lock Brakes Wiring Diagram, without IVD for Mercury Mountaineer 2003 List of elements for Anti-lock Brakes Wiring Diagram, without IVD for Mercury Mountaineer 2003: 30 (near breakout to windshield wiper motor) s120 Abs control module (left front side of engine compt) Abs test connector (at left side of engine compartment) Battery junction box (bjb) (left side of engine compt, at fender apron) Brake fluid level switch (mounted on right side of master cylinder) Brake pedal position switch (above brake pedal) Brake pressure switch mounted on master cylinder) C270b C270d C281b Central junction box (cjb) (behind left side of dash) Computer data lines system Four-wheel drive control module (under passenger dash panel) Fuse 10a Fuse 15a Fuse 2a Fuse 30a Fuse 40a G101 (left front of engine compt) Gnd Hot at all times Hot in start or run Left front wheel speed sensor Rear axle speed sensor (on rear differential) Right front wheel speed sensor S127 (in dash panel to engine harness, near breakout to a/c clutch cycling pressure switch) Scp+ Scp- Vbatt Vpwr
ANTI-THEFT Forced Entry Wiring Diagram for Mercury Mountaineer 2003 List of elements for Forced Entry Wiring Diagram for Mercury Mountaineer 2003: 79 (at right ``d" pillar) (in window regulator jumper assembly, near breakout to parking brake switch) (in window regulator jumper assembly, near breakout to passenger 1 side impact sensor) (not used) +/- 1/2 3/4 5/6 7/8 9/0 Anti- theft hood switch (right front of engine compt, on fender) Anti- theft inhibit switch (in driver door, near latch assembly) Autolmp sig Battery junction Battery junction box (bjb) (left side of engine compt, at fender apron) Box (bjb) (left side of engine compt, at fender apron) C220b C270a C270d C270e C3008d C3008e C3008f Central junction box (cjb) (behind left side of dash) Central security module (behind right rear seat) Data link connector (behind left side of dash) Door ajar sw Door locks system Driver side rear door ajar switch Exterior lights system Fuse 10a Fuse 15a Fuse 20a Fuse 30a Fuse 5a G101 (left front of engine compt) G103 (right front of engine compt) G400 (left rear of vehicle) G401 G401 (at right ``d" pillar) Glass release Gnd Headlights system Horn relay Horn relay pwr Hot at all times Instrument cluster Joint connector Key pad switch assembly Lamp pwr Left front door ajar switch Left horn Liftgate ajar Liftgate ajar switch (lower center of liftgate) Liftgate glass ajar switch (in center of tailgate) Passen- ger side rear door ajar switch Pnk Power windows system Pwr Rear auxiliary junction box (ajb) (on rear ``d" pillar) Red Right front door ajar switch Right horn S170 S205 S246 (in main harness, near breakout to c238) S259 S320 S328 S407 S502 S503 S602 Sig rtn Sw input Tan Ubp Vbatt Vbatt autolmp relay Passive Anti-theft Wiring Diagram for Mercury Mountaineer 2003 List of elements for Passive Anti-theft Wiring Diagram for Mercury Mountaineer 2003: 21 Battery junction box (bjb) (left side of engine compt, at fender apron) C175a C270d C270e Central junction box (cjb) (behind left side of dash) Fuse 5a G200 (at right ``a" pillar) G300 (at left ``a" pillar) Gnd Hot at all times Hot in start or run Ind ctrl Passive anti-theft transceiver (on steering column) Pats indicator Powertrain control module (at right side engine bulkhead) Rly ctrl S219 S229 Starter relay Sunload sensor (at center of dash) Vpwr
COMPUTER DATA LINES Computer Data Lines Wiring Diagram for Mercury Mountaineer 2003 List of elements for Computer Data Lines Wiring Diagram for Mercury Mountaineer 2003: 38 (at left side of engine compt) (in dash panel to engine harness, near breakout to c126) (left front of engine compt) (near breakout to audio unit) s228 (near breakout to c238) s246 (near breakout to passenger 1 side impact sensor) s351 Abs control module (left front side of engine compartment) Abs test connector C175a C220b C228b C270f C281b C3008f C310a C341g Central junction box (cjb) (behind left side of dash) Central security module (behind right rear seat) Data link connector (behind left side of dash) Driver seat module (in driver's seat) Electronic automatic temperature control module (under left dash panel) Four-wheel drive control module (under passenger dash panel) Fuse 24 15a G100 G200 (at right "a" pillar) Hot at all times Instrument cluster Low tire pressure module (under passenger dash panel) Module (at right "d" pillar) Parking aid Powertrain control module (at right side engine bulkhead) Restraints control module (below center console) S177 S178 S210 (near breakout to central junction box) S211 (near breakout to central junction box) S223 S263
CRUISE CONTROL Cruise Control Wiring Diagram, with IVD for Mercury Mountaineer 2003 List of elements for Cruise Control Wiring Diagram, with IVD for Mercury Mountaineer 2003: 47 (dtr) sensor Air bag sliding contact Air conditioning system Battery junction box (bjb) (left side of engine compt, at fender apron) Brake press sw in C175a C175b C218a C220a C220b C270h Cancel Central junction box (cjb) (behind left side of dash) Computer data lines system Cruise ctrl set ind Digital transmission range (dtr) sensor (lower left side of automatic transmission) Fuse 15a Fuse 5a Horn switch Horns system Hot at all times Hot in start or run Instrument cluster Interior lights system Microprocessor Nca P r Power Powertrain control module (pcm) (at right side engine bulkhead) Redundant pedal switch (under left side dash panel) Res S101 (near breakout to powertrain control module) S127 (in dash panel to engine harness, near breakout to a/c clutch cycling pressure switch) S130 S171 S232 (near breakout to central junction box) Scp bus+ Scp bus- Set+ Set- Signal return Speed control actuator (right front of engine compartment, on fender) Speed control switch Speed ctrl indicator Speed ctrl sw gnd Speed ctrl sw in Speed ctrl sw rtn Cruise Control Wiring Diagram, without IVD for Mercury Mountaineer 2003 List of elements for Cruise Control Wiring Diagram, without IVD for Mercury Mountaineer 2003: 45 (dtr) sensor Abs control module (left front side of engine compartment) Air bag sliding contact Air conditioning system Battery junction box (bjb) (left side of engine compt, at fender apron) Brake press sw in Brake pressure switch (mounted on master cylinder) C175a C175b C218a C220a C220b Cancel Central junction box (cjb) (behind left side of dash) Computer data lines system Cruise ctrl set ind Digital transmission range (dtr) sensor (lower left side of automatic transmission) Fuse 15a Fuse 2a Horn switch Horns system Hot at all times Hot in run or start Instrument cluster Interior lights system Microprocessor Nca Power Powertrain control module (pcm) (at right side engine bulkhead) Res S101 (near breakout to powertrain control module) S127 (in dash panel to engine harness, near breakout to a/c clutch cycling pressure switch) S130 S232 Scp bus+ Scp bus- Set+ Set- Signal return Speed control actuator (right front of engine compartment, on fender) Speed control switch Speed ctrl indicator Speed ctrl sw gnd Speed ctrl sw in Speed ctrl sw rtn
DEFOGGERS Defoggers Wiring Diagram for Mercury Mountaineer 2003 List of elements for Defoggers Wiring Diagram for Mercury Mountaineer 2003: 34 (near breakout to left rear speaker) s317 (right "a" pillar) g200 Auto a/c Battery junction box (bjb) (left side of engine compt, at fender apron) C220a C228a C270a C270c C270e C294b C402a C402b Central junction box (cjb) (behind left side of dash) Electronic automatic temperature control (eatc) module (under left dash panel) Function selector switch assembly Fuse 10a Fuse 15a Fuse 30a G401 (at right "d" pillar) G403 (left rear of vehicle) Hot at all times Hot in start or run Instrument cluster Left exterior rear view mirror Manual a/c Micro- Micro- processor Processor Rear window defrost grid Rear window defrost relay Right exterior rear view mirror S415 S502 S602
ENGINE PERFORMANCE
4.0L 4.0L, Engine Performance Wiring Diagram (1 of 4) for Mercury Mountaineer 2003 List of elements for 4.0L, Engine Performance Wiring Diagram (1 of 4) for Mercury Mountaineer 2003: 73 (near breakout to c126) (near breakout to left horn) s168 (near breakout to powertrain control module) 4wd A/c rly A/c sw A/c system Ac demand Anti-theft system Audio unit Battery Battery junction box (left side of engine compt) Brake in Brake pressure switch (mounted on master cylinder) C1117 C175a C240a Can vent Charging system Cruise control system Cruise set Data link connector (behind left side of dash) Evap pu Evaporative emission (evap) canister vent valve (right center of vehicle) F pmp pwr Fuse 15a Fuse 2a Fuse 40a G101 (left front of engine compt) G103 (right front of engine compt) G104 (right rear of engine compt) G105 (right rear of engine compt) Ground Hot at all times Hot in run or start Iat in Ign Ind ctrl Ind input J/c 1 J/c 2 Maf out Mass airflow (maf) sensor (right front of engine compartment) Od off Passive anti-theft transceiver (on steering column) Pcm power diode Pcm power relay Pgm sig Powertrain control module (at right side engine bulkhead) Pres sw Red/pnk Return Rly ctrl Rx sig S127 (near breakout to a/c clutch cycling pressure switch) S129 S130 S131 S132 Scp bus + Scp bus - Sens rtn Spd ctrl Spd sw St mtr Starting system Tank press Transmission control system Tx sig V ref Vapor manage- ment valve (left rear of engine compt) Vss Windshield wiper motor (left side of engine compt) 4.0L, Engine Performance Wiring Diagram (2 of 4) for Mercury Mountaineer 2003 List of elements for 4.0L, Engine Performance Wiring Diagram (2 of 4) for Mercury Mountaineer 2003: 47 (above brake pedal) brake pedal position switch (near breakout to powertrain control module) (near breakout to windshield washer motor) (on lower left of a/t) transmission solenoid body assembly C175b C270d Central junction box (behind left side of dash) Epc sol Fuse 15a H2os 12 htr H2os 12 in H2os 22 htr H2os 22 in Hot at all times Intermediate shaft speed (iss) sensor (top left side of trans) Iss J/c 2 (in battery junction box) Oss Output shaft speed sensor (left rear of trans) (a/t) (top right of trans) (m/t) Pcs b Pcs c Powertrain control module (at right side engine bulkhead) Press ctrl sol a Press ctrl sol b Press ctrl sol c Red/pnk S101 S120 Shift sol a Shift sol b Shift sol c Shift sol d Sig rtn Ss a Ss b Ss c Ss d Tcc sol Tft Tr1 Tr2 Tr3a Tr4 Transmission control switch Transmission fluid temperature sensor Tss Turbine shaft speed (tss) sensor (a/t) (top left of trans) 4.0L, Engine Performance Wiring Diagram (3 of 4) for Mercury Mountaineer 2003 List of elements for 4.0L, Engine Performance Wiring Diagram (3 of 4) for Mercury Mountaineer 2003: 31 (early prod: near breakout to junction box late prod: near breakout to c2095) s208 (lower left side of transmission) digital transmission range sensor (near breakout to digital transmission range sensor) s100 (near breakout to powertrain control module) (not used) (right "d" pillar) g401 Battery junction box (left side of engine compt) C270a Central junction box (behind left side of dash) c270f Except flex fuel Flex fuel Fuel pump relay Fuel pump/ fuel gauge sender Fuel tank assembly Fuel tank pressure sensor Fuel tank pressure transducer sensor Fuse 15a Fuse 5a Heated oxygen sensor (ho2s) 11 (on exhaust, pipe of engine) Heated oxygen sensor (ho2s) 12 (on exhaust, pipe of engine) Heated oxygen sensor (ho2s) 21 (on exhaust, pipe of engine) Heated oxygen sensor (ho2s) 22 (on exhaust, pipe of engine) Hot at all times Hot in run or start Inertia fuel shutoff switch (base of right "a" pillar) J/c 1 (in battery junction box) N r Nca Red/pnk S102 S103 (near breakout to heated oxygen sensor) 4.0L, Engine Performance Wiring Diagram (4 of 4) for Mercury Mountaineer 2003 List of elements for 4.0L, Engine Performance Wiring Diagram (4 of 4) for Mercury Mountaineer 2003: 48 (front of engine) ignition coil (in left rear of engine compt) ignition transformer capacitor (near breakout to heated oxygen sensor) s104 (near breakout to ignition coil) s134 (on top rear of engine) C175c C220b Camshaft position sensor (top front of left cyl head) Ckp sens + Ckp sens - Cmp sens Crankshaft position sensor (left front of engine) Dfpe sens Differential pressure feedback egr (dfpe) sensor (top of throttle body) Ect input Electronic vacuum regulator (evr) solenoid valve (on rear of right cyl head) Engine coolant temperature (ect) sensor (top right of engine) Evr ctrl Fuel gauge Fuel injectors G105 (right rear side of engine compt) Ho2s 11 Ho2s 11 htr Ho2s 21 Ho2s 21 htr Iac ctrl Idle air control valve (top of throttle body) Inj 1 Inj 2 Inj 3 Inj 4 Inj 5 Inj 6 Instrument cluster Knock sensor Ks 1 Micro- processor Nca Pcm to coil Pcm to t1 Powertrain control module (at right side engine bulkhead) Return S105 (near breakout to differential pressure feedback egr sensor) S106 Tan Throttle position (tps) sensor (top of throttle body) Tps V ref
4.6L 4.6L, Engine Performance Wiring Diagram (1 of 4) for Mercury Mountaineer 2003 List of elements for 4.6L, Engine Performance Wiring Diagram (1 of 4) for Mercury Mountaineer 2003: 77 (near breakout to c126) (near breakout to left horn) s168 (near breakout to powertrain control module) 4wd A/c rly A/c sw A/c system Ac demand Anti-theft system Audio unit Battery Battery junction box (left side of engine compt) Brake in Brake pressure switch (mounted on master cylinder) C117 C175a C240a Can vent Charging system Cruise control system Cruise set Data link connector (behind left side of dash) Evap pu Evaporative emission (evap) canister vent valve (right center of vehicle) F pmp pwr Fuse 15a Fuse 2a Fuse 40a G101 (left front of engine compt) G103 (right front of engine compt) G104 (right rear of engine compt) G105 (right rear of engine compt) Ground Hot at all times Hot in run or start Iat in Ign Ind ctrl Ind input J/c 1 J/c 2 Maf out Mass airflow (maf) sensor (right front of engine compartment) Od off Passive anti-theft transceiver (on steering column) Pcm power diode Pcm power relay Pgm sig Powertrain control module (at right side engine bulkhead) Pres sw Red/pnk Return Rly ctrl Rx sig S127 (near breakout to a/c clutch cycling pressure switch) S129 S130 S131 S132 S177 S178 Scp bus + Scp bus - Sens rtn Spd ctrl Spd sw St mtr Starting system Tank press Transmission control system Tx sig V ref Vapor manage- ment valve (left rear of engine compt) Vss W/ ivd W/o ivd Windshield wiper motor (left side of engine compt) 4.6L, Engine Performance Wiring Diagram (2 of 4) for Mercury Mountaineer 2003 List of elements for 4.6L, Engine Performance Wiring Diagram (2 of 4) for Mercury Mountaineer 2003: 50 (above brake pedal) brake pedal position switch (near breakout to powertrain control module) s101 (on lower left of a/t) transmission solenoid body assembly Abs control module (left front of engine compt) C175b C270d Central junction box (behind left side of dash) c270h Epc sol Fuse 15a H2os 12 htr H2os 12 in H2os 22 htr H2os 22 in Hot at all times Intermediate shaft speed (iss) sensor (top left side of trans) Iss J/c 2 (in battery junction box) Oss Output shaft speed sensor (left rear of trans) (a/t) (top right of trans) (m/t) Pcs b Pcs c Powertrain control module (at right side engine bulkhead) Press ctrl sol a Press ctrl sol b Press ctrl sol c Red/pnk Redundant pedal switch (under left side of dash) S120 (w/ ivd: near breakout to left horn w/o ivd near breakout to windshield washer motor) S171 Shift sol a Shift sol b Shift sol c Shift sol d Sig rtn Ss a Ss b Ss c Ss d Tcc sol Tft Tr1 Tr2 Tr3a Tr4 Transmission control switch Transmission fluid temperature sensor Tss Turbine shaft speed (tss) sensor (a/t) (top left of trans) W/ ivd W/o ivd 4.6L, Engine Performance Wiring Diagram (3 of 4) for Mercury Mountaineer 2003 List of elements for 4.6L, Engine Performance Wiring Diagram (3 of 4) for Mercury Mountaineer 2003: 32 (early prod: near breakout to junction box late prod: near breakout to c2095) (lower left side of transmission) digital transmission range sensor (near breakout to powertrain control module) (right "d" pillar) g401 Battery junction box (left side of engine compt) C220b C270f Central junction box (behind left side of dash) Fuel guage Fuel pump relay Fuel pump/ fuel gauge sender Fuel tank assembly Fuel tank pressure sensor Fuse 15a Fuse 5a Heated oxygen sensor (ho2s) 11 (on exhaust pipe of engine) Heated oxygen sensor (ho2s) 12 (on exhaust pipe of engine) Heated oxygen sensor (ho2s) 21 (on exhaust pipe of engine) Heated oxygen sensor (ho2s) 22 (on exhaust pipe of engine) Hot at all times Hot in run or start Inertia fuel shutoff switch (base of right "a" pillar) Instrument cluster J/c 1 (in battery junction box) Microprocessor N r Nca Red/pnk S100 (near breakout to digital transmission range sensor) S102 S103 (near breakout to heated oxygen sensor) S208 4.6L, Engine Performance Wiring Diagram (4 of 4) for Mercury Mountaineer 2003 List of elements for 4.6L, Engine Performance Wiring Diagram (4 of 4) for Mercury Mountaineer 2003: 55 (near breakout to differential pressure feedback egr sensor) s105 (near breakout to fuel injector 3) s108 (near breakout to heated oxygen sensor) s104 (on top rear of engine) C175c Camshaft position sensor (top front of left cyl head) Ckp sens + Ckp sens - Cmp sens Coil on plug Cop 1 Cop 2 Cop 3 Cop 4 Cop 5 Cop 6 Cop 7 Cop 8 Crankshaft position sensor (left front of engine) Cyl input Cylinder head temperature sensor (top front of cylinder head) Dfpe sens Differential pressure feedback egr (dfpe) sensor (top of throttle body) Electronic vacuum regulator (evr) solenoid valve (on rear of right cyl head) Evr ctrl Fuel injec- tors G105 (right rear of engine compt) Ho2s 11 Ho2s 11 htr Ho2s 21 Ho2s 21 htr Iac ctrl Idle air control valve (top of throttle body) Ignition transformer capacitor 1 (engine compt) Ignition transformer capacitor 2 (engine compt) Inj 1 Inj 2 Inj 3 Inj 4 Inj 5 Inj 6 Inj 7 Inj 8 Knock sensor Ks 1 Nca Powertrain control module (at right side engine bulkhead) Return S106 S109 (near breakout to fuel injector 7) Tan Tan/red Throttle position (tps) sensor (top of throttle body) Tps V ref
EXTERIOR LIGHTS Back-up Lamps Wiring Diagram for Mercury Mountaineer 2003 List of elements for Back-up Lamps Wiring Diagram for Mercury Mountaineer 2003: 18 (in rear lamp connector harness, near breakout to parking aid speaker) s401 (in window regulator jumper assembly, near breakout to driver safety belt buckle switch) s309 Auto- dimming interior mirror unit C270a Central junction box (cjb) (behind left side of dash) Digital transmission range (dtr) sensor (lower left side of automatic transmission) Fuse 7.5a G400 (left rear of vehicle) G401 (at right "d" pillar) Hot in run or start J/c 3 Left reversing lamp Parking aid module (at right "d" pillar) Rear auxiliary junction box (ajb) (right "d" pillar) Reversing lamp trailer tow relay Right reversing lamp S400 S404 Exterior Lamps Wiring Diagram, with IVD for Mercury Mountaineer 2003 List of elements for Exterior Lamps Wiring Diagram, with IVD for Mercury Mountaineer 2003: 84 (in dash panel to engine harness, near breakout to left repeater lamp) s136 (in window regulator jumper assembly, near breakout to central security module) s307 (near breakout to data link connector) (near breakout to left horn) s122 (near breakout to sunload sensor) (near breakout to windshield wiper motor) (police option) (near breakout to left horn) (right "d" pillar) rear auxiliary junction box (ajb) Abs control module (except police option) (left front side of engine compt) Auto Battery junction (w/o drl) or underhood auxiliary junction (w/ drl) Battery junction box (bjb) (left side of engine compt, at fender apron) Box (ajb) Box (bjb) Brake pedal position switch (above brake pedal) Brake pedal relay (except police option) C202b C205a C220a C220b C270a C270d C270h C3008e Central junction box (cjb) (behind left side of dash) Central security module (behind right rear seat) Except police option Fuse 15a Fuse 5a G101 (left front of engine compartment) G103 (right front of engine compartment) G200 (at right "a" pillar) G400 (left rear of vehicle) G401 (at right "d" pillar) Hazard Head High mounted stoplamp Hot at all times Hot in run or start Indicator flasher relay Instrument cluster J/c J/c 3 Left front park/ turn lamp Left front side lamp Left license plate lamp Left re- peater lamp Left rear park/ stop/ turn lamp Left rear side lamp Left tail lamp Left turn Left turn indicator Main light switch Multi-function switch Nca Near breakout to central junction box) Off Park Parking lamp trailer tow relay Rear auxiliary junction box (ajb) (right "d" pillar) Right front park/ turn lamp Right front side lamp Right license plate lamp Right re- peater lamp Right rear park/ stop/ turn lamp Right rear side lamp Right tail lamp Right turn Right turn indicator S120 S126 S137 (near breakout to ambient air temperature sensor) S138 S169 S171 S179 S204 S250 S251 S259 S407 Stop lamp isolation relay Trailer electronic brake control module (under left side dash panel) Trailer tow circuit Exterior Lamps Wiring Diagram, without IVD for Mercury Mountaineer 2003 List of elements for Exterior Lamps Wiring Diagram, without IVD for Mercury Mountaineer 2003: 73 (in dash panel to engine harness, near breakout to left horn) s122 (in window regulator jumper assembly, near breakout to central security module) s307 (near breakout to central junction box) s203 (near breakout to data link connector) (near breakout to left rear park/stop /turn lamp) s405 (near breakout to left repeater lamp) s136 (near breakout to right reversing lamp) s402 (near breakout to sunload sensor) (right "d" pillar) rear auxiliary junction box (ajb) Auto off Battery junction box (bjb) (left side of engine compt, at fender apron) Brake pedal position switch (above brake pedal) C202b C205a C220a C220b C270a C270d C3008e Central junction box (cjb) (behind left side of dash) Central security module (behind right rear seat) Fuse 15a Fuse 5a G101 (left front of engine compartment) G103 (right front of engine compartment) G200 (at right "a" pillar) G400 (left rear of vehicle) G401 (at right "d" pillar) Hazard Head High mounted stoplamp Hot at all times Hot in run or start Indicator flasher relay Instrument cluster J/c J/c 3 Left front park/ turn lamp Left front side lamp Left license plate lamp Left re- peater lamp Left rear park/ stop/ turn lamp Left rear side lamp Left tail lamp Left turn Left turn indicator Main light switch Multi-function switch Nca Near breakout to central junction box) Park Parking lamp trailer tow relay Rear auxiliary junction box (ajb) (right "d" pillar) Right front park/ turn lamp Right front side lamp Right license plate lamp Right re- peater lamp Right rear park/ stop/ turn lamp Right rear side lamp Right tail lamp Right turn Right turn indicator S120 (in dash panel to engine harness, near breakout to windshield wiper motor) S126 S137 (near breakout to ambient air temperature sensor) S138 S204 S250 S251 S259 S407 Trailer electronic brake control module (under left side dash panel) Trailer tow circuit Trailer Tow Wiring Diagram, Early Production for Mercury Mountaineer 2003 List of elements for Trailer Tow Wiring Diagram, Early Production for Mercury Mountaineer 2003: 34 Back-up lamps circuit Battery charge trailer tow relay Battery junction box (bjb) (left side of engine compt, at fender apron) Brake pedal position switch (above brake pedal) C270a C270d Central junction box (cjb) (behind left side of dash) Class ii Class iii/iv Exterior lamps circuit Fuse 15a Fuse 20a Fuse 30a Fuse 40a Fuse 5a G103 (right front of engine compartment) G200 (at right "a" pillar) G401 (at right "d" pillar) Hot at all times Hot in run or start J/c Left turn trailer tow relay Parking lamp trailer tow relay Rear auxiliary junction box (ajb) (right "d" pillar) Reversing lamp trailer tow relay Right turn trailer tow relay S120 (w/ ivd: near breakout to left horn) (w/o ivd: near breakout to windshield wiper motor) S121 S216 S410 S412 Trailer electronic brake control module (under left side of dash panel) Trailer tow connector (class ii) (at rear of vehicle, below bumper) Trailer tow connector (class iii/iv) (at rear of vehicle, below bumper) Trailer Tow Wiring Diagram, Late Production for Mercury Mountaineer 2003 List of elements for Trailer Tow Wiring Diagram, Late Production for Mercury Mountaineer 2003: 35 (in suspension leveling compressor harness, near breakout to trailer tow connector) s419 Back-up lamps circuit Battery charge trailer tow relay Battery junction box (bjb) (left side of engine compt, at fender apron) Brake pedal position switch (above brake pedal) C270a C270d Central junction box (cjb) (behind left side of dash) Exterior lamps circuit Fuse 15a Fuse 20a Fuse 30a Fuse 40a Fuse 5a G103 (right front of engine compartment) G200 (at right "a" pillar) G401 (at right "d" pillar) Hot at all times Hot in run or start J/c Left turn trailer tow relay Parking lamp trailer tow relay Rear auxiliary junction box (ajb) (right "d" pillar) Reversing lamp trailer tow relay Right turn trailer tow relay S120 (w/ ivd: near breakout to left horn) (w/o ivd: near breakout to windshield wiper motor) S121 S216 S410 S412 S420 (in suspension leveling compressor harness, near breakout to trailer tow connector) S421 (in suspension leveling compressor harness, near breakout to trailer tow connector) Trailer electronic brake control module (under left side of dash panel) Trailer tow connector (class ii) (at rear of vehicle, below bumper) Trailer tow connector (class iii/iv) (at rear of vehicle, below bumper)
GROUND DISTRIBUTION Ground Distribution Wiring Diagram (1 of 4) for Mercury Mountaineer 2003 List of elements for Ground Distribution Wiring Diagram (1 of 4) for Mercury Mountaineer 2003: 64 (ends in harness) abs test connector (left side of engine compartment, at fender apron) battery junction box (bjb) A/c clutch cycling pressure switch A/c clutch solenoid A/c high pressure switch A/c indicator diode Abs control module Anti-theft hood switch Battery Battery junction box (bjb) (left side of engine compt, at fender apron) Blower motor relay Brake fluid level switch C175a Data link connector (dlc) Daytime running lamps (drl) module Daytime running lamps (drl) relay Digital transmission range (dtr) sensor Explorer Fog lamp relay G100 (left front of engine compartment) G101 (left front of engine compartment) G102 (left front of engine compartment) G103 (right front of engine compartment) G104 (right rear of engine compartment) G105 (right rear of engine compartment) G106 (left side of engine compartment) G107 (left side of engine compartment) G109 (in engine compartment) High beam relay Ignition relay Left front fog lamp Left front high beam lamp Left front low beam lamp Left front park/turn lamp Left front side lamp Left headlamp Left horn Left repeater lamp Left turn trailer tow relay Mass air flow (maf) sensor Mountaineer Nca Near breakout to c1168) Pcm power relay Powertrain control module (pcm) Right front fog lamp Right front high beam lamp Right front low beam lamp Right front park/turn lamp Right front side lamp Right headlamp Right horn Right repeater lamp Right turn trailer tow relay S125 (in dash panel to engine harness, near breakout to g100) S126 (in dash panel to engine harness, near breakout to g103) S135 (in dash panel to engine harness, near breakout to a/c clutch cycling pressure switch) S138 (in dash panel to headlamp junction extension harness, near breakout to left headlamp) S139 (in dash panel to headlamp junction extension harness, near breakout to right headlamp) Shield Stoplamp isolation relay Underhood auxiliary junction box (ajb) (w/ daytime running lamps) Washer fluid level switch Windshield wiper motor Ground Distribution Wiring Diagram (2 of 4) for Mercury Mountaineer 2003 List of elements for Ground Distribution Wiring Diagram (2 of 4) for Mercury Mountaineer 2003: 71 (mach radio) subwoofer amplifier (manual a/c) (manual a/c) function selector switch assembly Adjustable pedal switch Audio unit Brake shift interlock C202a C205a C205b C220a C220b C228b C240b C281a C281b C294b C294c C310a C341g Console 1 power point Console 2 power point Data link connector (dlc) Driver safety belt buckle switch Driver seat module Dvd player Electronic automatic temperature control (eatc) module Electronic compass Except base Four- wheel drive switch Four-wheel drive control module Front blower motor resistor assembly Front blower motor speed controller Front cigar lighter Function selector switch assembly G200 (right "a" pillar) G204 (right "a" pillar) G205 (under center console) G206 (behind center of dash) G300 (left "a" pillar) G301 (under center console) Glove box lamp Harness, near breakout to c237) High speed fan control relay Instrument cluster Main light switch Memory set switch Message center switch Multi- function switch Nca Parking aid disable switch Passenger safety belt buckle switch Passive anti-theft transceiver Red Restraints control module S204 (in main harness, near breakout to central junction box) S216 (in main harness, near breakout to sunload sensor) S219 (in main harness, near breakout to sunload sensor) S223 (in main harness, near breakout to data link connector) S230 (in main harness, near breakout to audio unit) S240 (air conditioning harness, near breakout to temperature blend door actuator) S267 (in radio jumper harness, near breakout to c237) S319 (in window regulator jumper assembly, near breakout to parking brake switch) S333 (in window regulator jumper assembly, near breakout to restraints control module) Sunload sensor Temperature blend door actuator Traction control switch Trailer electronic brake control module W/ dual zone eatc W/ dual zone eatc W/ dvd player W/ manual a/c Ground Distribution Wiring Diagram (3 of 4) for Mercury Mountaineer 2003 List of elements for Ground Distribution Wiring Diagram (3 of 4) for Mercury Mountaineer 2003: 61 (w/o memory) (w/o memory) left power seat switch Adjustable pedal switch Auto- dimming interior mirror unit C341e C504a C912a C912b Driver seat module Driver side front heated seat module Driver side rear door ajar switch Driver side seat heater switch Early build Explorer Front interior/ map lamps assembly G400 (left rear of vehicle) G401 (right "d" pillar) High mounted stoplamp Homelink module Joint connector Late build Left license plate lamp Left power seat switch Left rear park/stop/ turn lamp Left rear side lamp Left reversing lamp Left tail lamp Left vanity mirror lamp Liftgate ajar switch Liftgate door lock switch Liftgate glass actuator Liftgate glass release switch Link connector) Master window adjust switch Mountaineer Nca Parking aid module (pam) Passenger side rear door ajar switch Puddle lamp relay Rear auxiliary junction box (ajb) Rear auxiliary junction box (ajb) (right "d" pillar) Rear wiper motor assembly Right license plate lamp Right rear park/stop/ turn lamp Right rear side lamp Right reversing lamp Right tail lamp Right vanity mirror lamp Roof opening panel motor assembly Roof opening panel switch S300 (in seat control feed jumper harness, near breakout to left power seat switch) S352 (in window regulator jumper assembly, near breakout to left power seat switch) S400 (in rear lamp connector harness, near breakout to right rear park/ stop/turn lamp) S404 (in rear lamp connector harness, near breakout to c421) S404 (rear lamp connector harn, near breakout to c421) S407 (tailgate warning switch harness, in breakout to c494) S900 (in interior lamps harness, near breakout to left vanity mirror lamp) S911 (in pia harness, at breakout to roof opening panel switch) Trailer tow battery charge relay Trailer tow parking lamp relay Trailer tow reversing lamp relay Ground Distribution Wiring Diagram (4 of 4) for Mercury Mountaineer 2003 List of elements for Ground Distribution Wiring Diagram (4 of 4) for Mercury Mountaineer 2003: 60 (in suspension leveling compressor harness, in breakout to c405) Anti-theft inhibit switch At breakout to c340) Auxiliary a/c relay C270a C3008d C335a C365a C402b C938a C938b C940a Cargo lamp assembly Central junction box (cjb) (behind left side of dash) Central security module Class ii Class iii/iv Driver side door lock switch Driver side side seat back heater Early build Exterior rear view mirror switch Front interior/ map lamps assembly Fuel tank unit G400 (left rear of vehicle) G401 (right "d" pillar) G403 (left rear of vehicle) Indicator flasher relay Joint connector Key pad switch assembly Late build Left exterior rear view mirror Left front door ajar switch Low tire pressure module Memory set switch Nca Parking brake switch Passenger side front door lock unit Passenger side front heated seat module Passenger side seat back heater Passenger side seat heater switch Rear a/c control module Rear a/c control module (front) Rear auxiliary junction box (ajb) (right "d" pillar) Rear interior/ map lamps assembly Rear window defrost grid Rear wiper motor assembly Right exterior rear view mirror Right front door ajar switch Right power seat switch S305 (in seat control feed jumper harness, near breakout to c3051) S341 (in air conditioning harness, near breakout to c3007) S410 S415 (in rear window wiper motor feed harness, near breakout to rear wiper motor assembly) S502 (in window regulator jumper assembly, near breakout to driver's side door lock switch) S503 (in door lock jumper harness, near breakout to c510) S602 (in window regulator jumper assembly, near breakout to right exterior rear view mirror) Temperature blend door actuator Trailer tow connector W/ overhead console W/o overhead console
HEADLIGHTS Headlights Wiring Diagram for Mercury Mountaineer 2003 List of elements for Headlights Wiring Diagram for Mercury Mountaineer 2003: 50 (at right ``a" pillar) g200 (in dash panel to engine harness, near breakout to c126) s123 (in dash panel to engine harness, near breakout to g100) s133 (in main harness, near breakout to central junction box) s260 (not used) Air conditioning system Anti-theft system Auto Battery junction box (bjb) (left side of engine compt, at fender apron) C202c C205a C220b C3008e Central security module (behind right rear seat) Fog lamp relay Fog lamp switch Fuse 10a Fuse 15a Fuse 20a G101 (left front of engine compt) G103 (right front of engine compt) G200 (at right ``a" pillar) Head Headlamp relay Hi beam ind High beam relay Hot at all times Instrument cluster Left front fog lamp Left headlamp Main light switch Microprocessor Multi-function switch Off Park Pass Right front fog lamp Right headlamp S117 S126 S138 S139 S203 (in main harness, near breakout to central junction box) S204 S205 S229 S252 (in main harness, near breakout to central junction box) S259 Sunload sensor (at center of dash) W/ autolamps
HORN Horn Wiring Diagram for Mercury Mountaineer 2003 List of elements for Horn Wiring Diagram for Mercury Mountaineer 2003: 30 (near breakout to parking brake switch) 10a 20a Air bag sliding contact Battery junction box (bjb) (left side of engine compt, at fender apron) C175a C218a C270a C270d C3008e Central junction box (cjb) (behind left side of dash) Central security module (behind right rear seat) Fuse 18 Fuse 28 Fuse 6 G101 (left front of engine compt) G103 (right front of engine compt) Horn relay Horn switch Hot at all times Left horn Low tire pressure module (under passenger dash panel) Nca Powertrain control module (at right side engine bulkhead) Right horn S170 S172 (near breakout to windshield wiper motor) S320 S328 (near breakout to passenger 1 side impact sensor) Speed control switch
INSTRUMENT CLUSTER Instrument Cluster Wiring Diagram for Mercury Mountaineer 2003 List of elements for Instrument Cluster Wiring Diagram for Mercury Mountaineer 2003: 55 (in main harness, near breakout to central junction box) s206 (w/ dual zone eatc) Air conditioning system Ambient air temperature sensor (w/ manual a/c) (right front of engine compt, near radiator support) Battery junction box (bjb) (left side of engine compt, at fender apron) C220a C220b C270e C270h Central junction box (cjb) (behind left side of dash) Charge ind Check engine ind Check gauge ind Computer data lines system Daytime running lamps (drl) module (left side of engine compt,on inner fender well) Defogger system Electronic compass Except base Except flex fuel Exterior lights system Flex fuel Fuel tank unit Fuse 15a Fuse 30a Fuse 5a G102 (left front of engine compt) G200 (at right "a" pillar) G300 (at left "a" pillar) G300 (left side "a" pillar) G400 (left rear of vehicle) Headlamps system High beam ind Hot at all times Hot in run or acc Hot in run or start Ignition switch Illumination (6 bulbs) Instrument cluster Interior lights system Joint connector 1 (in battery junction box) Key in ignition Left turn signal ind Message center switch Micro processor Nca Oil pressure switch (4.0l: left side of engine block) (4.6l: lower left side of engine block) Parking brake switch (under driver side dash panel) Power windows system Right turn signal ind S125 S204 S219 S223 S232 Washer fluid level switch (right front of engine compt)
INTERIOR LIGHTS Courtesy Lamps Wiring Diagram, Base for Mercury Mountaineer 2003 List of elements for Courtesy Lamps Wiring Diagram, Base for Mercury Mountaineer 2003: 29 Accessory delay relay Battery saver relay C220a C270a C270e C270h Cargo lamp assembly Central junction box (cjb) (behind left side of dash) Closed Front interior/ map lamps assembly Fuse 15a G200 (at right "a" pillar) G401 (at right "d" pillar) Glove box lamp Hot at all times Instrument cluster Interior lamp Joint connector Liftgate open Map lamps Microprocessor Off Open Rear auxiliary junction box (on right "d" pillar) Rear interior/ map lamps assembly S229 S903 S904 (in interior illumination harness near breakout to c340) W/o overhead console Courtesy Lamps Wiring Diagram, Except Base (1 of 2) for Mercury Mountaineer 2003 List of elements for Courtesy Lamps Wiring Diagram, Except Base (1 of 2) for Mercury Mountaineer 2003: 30 Accessory delay relay Battery saver relay C220a C270a C270e C270h Central junction box (cjb) (behind left side of dash) Closed Early production Fuse 15a Fuse 7.5a G200 (at right "a" pillar) G401 (at right "d" pillar) Glove box lamp Hot at all times Hot in start or run Instrument cluster Joint connector Late production Left exterior rear view mirror Microprocessor Open Puddle lamp Puddle lamp relay Rear auxiliary junction box (on right "d" pillar) Right exterior rear view mirror S229 S350 (in window regulator jumper assembly, near breakout to driver safety belt buckle switch) S502 S602 Courtesy Lamps Wiring Diagram, Except Base (2 of 2) for Mercury Mountaineer 2003 List of elements for Courtesy Lamps Wiring Diagram, Except Base (2 of 2) for Mercury Mountaineer 2003: 18 (in pia wiring harness, near breakout to to c912b) s912 (left rear of vehicle) Except late production w/ medium overhead console Front interior/ map lamps assembly G400 G400 (left rear of vehicle) Gnd Homelink module Interior lamp Late production w/ medium overhead console Left vanity mirror lamp Map lamps Off Right vanity mirror lamp S900 S901 (in interior lamps harness, near breakout to left vanity mirror lamp) S911 Vpwr Instrument Illumination Wiring Diagram for Mercury Mountaineer 2003 List of elements for Instrument Illumination Wiring Diagram for Mercury Mountaineer 2003: 63 (in main harness, near breakout to audio unit) s225 (near breakout to central junction box) Adjustable pedal switch Air bag sliding contact Audio unit Audio/ climate control switch Autolamp Battery junction box (bjb) (left side of engine compt, at fender apron) Bulbs C205a C205b C218a C220b C228a C228b C240b C294b C938a C940a Driver side door lock switch Dvd player Electronic automatic temperature control (eatc) module (under left dash panel) Exterior lights system Four-wheel drive switch (behind center of dash) Function selector switch assembly Fuse 15a G200 (at right "a" pillar) G300 (at left "a" pillar) G400 (left rear of vehicle) G401 (at right "d" pillar) Head Hot at all times Instru- ment cluster Joint connector Main light switch Message center switch Microprocessor Nca Park off Parking aid disable switch Passenger side front door lock unit Rear a/c control module (front) (in roof panel) Rear a/c control module (rear) (w/o roof opening panel) (in roof panel) Rear auxiliary junction box (on right "d" pillar) S203 S204 S219 S223 S229 S259 S265 S268 (in radio jumper harness near breakout to c2237) S349 (in seat control feed jumper harness, near breakout to right front speaker) S502 S602 S903 S908 S909 (in interior illumination harness, at breakout to c340) Speed control switch Traction control switch W/ dvd player W/ eatc W/ manual a/c
MEMORY SYSTEMS Adjustable Pedal Wiring Diagram for Mercury Mountaineer 2003 List of elements for Adjustable Pedal Wiring Diagram for Mercury Mountaineer 2003: 41 (at right ``a" pillar) g200 (near breakout to c3052) s302 (near breakout to central junction box) (near breakout to instrument cluster) (near breakout to data link connector) s221 (near breakout to instrument cluster) (near breakout to left power seat switch) s303 (not used) (under center console) g301 Adj pedal mtr Adj pedal pot Adj pedal sw Adjustable pedal memory potentiometer (under driver's side of dash) Adjustable pedal motor (on pedal assembly, left of brake pedal) Adjustable pedal switch (behind left side of dash) C210 C215 C270a C341e C341f C341g C353a Central junction box (cjb) (behind left side of dash) Driver seat module (in driver's seat) Forward Fuse 30a G400 (left rear of vehicle) Ground Hot at all times Interior lights system Left power seat motor assembly Memory seats circuit Memory set sw Pos sens + Pos sens - Power Rearward Red S213 S214 S333 S352 Driver"s Memory Seat Wiring Diagram for Mercury Mountaineer 2003 List of elements for Driver"s Memory Seat Wiring Diagram for Mercury Mountaineer 2003: 52 (near breakout to c3052) (near breakout to left power seat switch) Adj pedal mtr Adj pedal pot Adj pedal sw Adjustable pedal circuit C270a C270e C341e C341f C341g C353a C353b Central junction box (cjb) (behind left side of dash) Computer data lines system Driver seat module (in driver's seat) Front Front hght sens Front up/down Fuse 30a Fuse 5a Fwd G301 (under center console) G400 (left rear of vehicle) G401 (at right ``d" pillar) Ground Horiz sens Hot at all times Left power seat motor assembly Left power seat switch Memory set sw Memory set switch Nca Pos sense + Pos sense - Power Pwr seat motor Pwr seat sw Rear Rear hgt sens Rear up/down Red Rwd S302 S303 S333 S352 S502 Seat Seat fwd/rwd Set Ubp diag
NAVIGATION Navigation Wiring Diagram for Mercury Mountaineer 2003 List of elements for Navigation Wiring Diagram for Mercury Mountaineer 2003: 40 (in breakout to inner right parking aid sensor) s408 (in breakout to inner right parking aid sensor) s409 C270a C270e Central junction box (cjb) (behind left side of dash) Computer data lines system Digital transmission range (dtr) sensor (lower left side of automatic transmission) Exterior lights system Exterior lights, mirrors systems Fuse 26 7.5a Fuse 27 7.5a G200 (at right ``a" pillar) G401 (at right ``d" pillar) Ground Hot in run or start Interior lights system Iso Left inner parking aid sensor Left inner sensor input Left outer parking aid sensor Left outer sensor input On/off switch Parking aid disable switch Parking aid module (at right ``d" pillar) Parking aid speaker (at right ``d" pillar) Pnk Power Rear sounder (+) Rear sounder (-) Reverse input Right inner parking aid sensor Right inner sensor input Right outer parking aid sensor Right outer sensor input S204 S400 S401 (near breakout to parking aid speaker) Sensor ground Sensor power Status led
POWER DISTRIBUTION Power Distribution Wiring Diagram (1 of 4) for Mercury Mountaineer 2003 List of elements for Power Distribution Wiring Diagram (1 of 4) for Mercury Mountaineer 2003: 66 (battery cable assembly, near breakout to battery junction box) (diagram 3 of 4) (in window regulator jumper assembly, near breakout to c3134) s313 (left side of engine compt, at fender apron) battery junction box (bjb) Abs control module Adjustable pedal switch Auxiliary a/c relay Auxiliary junction box (ajb) (on rear ``d" pillar) Auxiliary junction box (ajb) rear (on rear ``d" pillar) Battery Battery junction box (bjb) (left side of engine compartment, at fender apron) Battery junction box (bjb) (left side of engine compt, at fender apron) Blower motor relay C102a C270c C281b C3008e Central junction box (cjb) (behind left side of dash) Central security module Circuit breaker 30a Console 1 power point Console 2 power point Daytime running lamps (drl) module Four-wheel drive control module From fuse 14 (bjb) (diagram 1 of 4) From fuse 6 (bjb) (diagram 1 of 4) Fuel pump relay Fuse 10a Fuse 15a Fuse 20a Fuse 30a Fuse 40a Fuse 50a Fuse 60a G200 (right ``a'' pillar) Generator Harness, near breakout to joint connector 1) s170 Horn relay Ignition relay Left turn trailer tow relay Main light switch Nca Parking lamp trailer tow relay Pcm power relay Rear window defrost relay Rear wiper motor assembly Red Regulator jumper assembly, near breakout to g401) s412 Reverse lamp trailer tow relay Right power seat switch Right turn trailer tow relay S142 S143 S216 Starter motor Starter relay To accessory delay relay (cjb) (diagram 3 of 4) To fuse 10 (cjb) To fuse 11 (bjb) (diagram 1 of 4) To fuse 15 (bjb) (diagram 3 of 4) To fuse 16 (cjb) (diagram 4 of 4) To fuse 26 (bjb) (diagram 1 of 4) To fuse 5 (cjb) (diagram 3 of 4) To ignition switch (diagram 2 of 4) Trailer electronic brake control module Trailer tow battery charge relay Power Distribution Wiring Diagram (2 of 4) for Mercury Mountaineer 2003 List of elements for Power Distribution Wiring Diagram (2 of 4) for Mercury Mountaineer 2003: 60 (behind left side of dash) central junction box (cjb) (in main harness, near breakout to central junction box) s207 (in main harness, near breakout to sunload sensor) s261 (left side of engine compt, at fender apron) battery junction box (bjb) Abs control module Acc Audio unit Brake pressure switch Brake shift interlock Breakout to right wheel speed sensor) s129 C220a C220b C240b C270a C270b C270d C270e C270f C270g C270h C310a Connector 1) s113 Digital digital transmission transmission range (dtr) sensor Electronic compass Electronic vaccum regulator (evr) solenoid valve Evaporative emission (evap) canister vent valve From fuse 23 (bjb) (diagram 1 of 4) From s207 (diagram 2 of 4) Fuel charge harness, near breakout to heated oxygen sensor) s103 Fuse 10a Fuse 15a Fuse 2a Fuse 5a Heated oxygen sensor 11 (ho2s) Heated oxygen sensor 12 (ho2s) Heated oxygen sensor 21 (ho2s) Heated oxygen sensor 22 (ho2s) Ignition relay Ignition switch Indicator flasher relay Instrument cluster Joint connector 2 Key in ignition switch Key removal inhibit solenoid Low tire pressure module Micro- processor Nca Near breakout to digital transmission range sensor) s100 Off Pcm power diode Pcm power relay Rear wiper motor assembly Red Restraints control module Run Start To fuse 25 (cjb) (diagram 4 of 4) To s113 (diagram 2 of 4) Vapor management valve Windshield wiper motor Power Distribution Wiring Diagram (3 of 4) for Mercury Mountaineer 2003 List of elements for Power Distribution Wiring Diagram (3 of 4) for Mercury Mountaineer 2003: 64 (behind left side of dash) central junction box (cjb) (in main harness, near breakout to central junction box) s205 (in main harness, near breakout to central junction box) s232 (left side of engine compartment, at fender apron) battery junction box (bjb) (w/ dual zone) (w/ dvd player) A/c clutch relay Accessory delay relay Audio unit Auxiliary junction box (ajb) (underhood) (w/ drl) Battery junction box (bjb) (left side of engine compartment, at fender apron) Brake pedal position switch Brake pedal relay (except police) C175a C202c C205a C220a C228b C240b C270a C270b C270c C270d C270g C270h C3008e C341e Central junction box (cjb) (behind left side of dash) Central security module Driver heated seat module Driver seat module Dvd player Electronic automatic temperature control (eatc) module From circuit breaker 47 (bjb) (diagram 1 of 4) From fuse 1 (bjb) (diagram 1 of 4) From fuse 23 (bjb) (diagram 1 of 4) From fuse 24 (cjb) (diagram 4 of 4) From ignition relay (bjb) (diagram 1 of 4) Fuse 10a Fuse 15a Fuse 20a Fuse 30a High beam relay Indicator flasher relay Instrument cluster Joint connector 1 Left power seat switch Main light switch Multi-function switch Nca Passenger heated seat module Powertrain control module (pcm) Rear window defrost relay Red Redundant pedal switch (except police) Roof opening panel motor assembly Stop lamp isolation relay Stop lamp isolation relay (w/o drl) Subwoofer amplifier Temperature blend door actuator To fuse 12 (cjb) (diagram 4 of 4) W/ memory W/o memory Windshield wiper motor Power Distribution Wiring Diagram (4 of 4) for Mercury Mountaineer 2003 List of elements for Power Distribution Wiring Diagram (4 of 4) for Mercury Mountaineer 2003: 69 (behind left side of dash) central junction box (cjb) (in main harness, near breakout to c2126) s263 (in main harness, near breakout to central junction box) s247 (in rear axle shifter motor control switch extension harness, in breakout to traction control switch) s264 (near breakout to restraints control module) Accessory delay relay Auto-dimming interior mirror unit Auxiliary a/c relay Battery saver relay Brake shift interlock C228b C270a C270b C270c C270d C270e C270f C270g C270h C294a C294b C3008e C341g C938a Central security module Data link connector (dlc) Daytime running lamps (drl) module Digital transmission range (dtr) sensor Driver seat module Driver side seat heater switch (late build) Eatc Electronic automatic temperature control (eatc) module Exterior rear view mirror switch Four- wheel drive switch From fuse 10 (cjb) (diagram 3 of 4) From fuse 17 (cjb) (diagram 4 of 4) From fuse 22 (cjb) (diagram 2 of 4) From fuse 26 (cjb) (diagram 4 of 4) From fuse 29 (bjb) (diagram 1 of 4) Front cigar lighter Fuel tank unit Function selector switch assembly Fuse 15a Fuse 20a Fuse 5a Fuse 7.5a G200 (right ``a" pillar) Left power seat switch Low tire pressure module Manual a/c Nca Neutral tow indicator Parking aid module (pam) Passenger side seat heater switch (late build) Passive anti-theft transceiver Puddle lamp relay Rear a/c control module Rear auxiliary junction box (ajb) (on rear ``d" pillar) Red S216 S316 Sunload sensor Temperature blend door actuator To fuse 20 (cjb) (diagram 4 of 4) To fuse 23 (cjb) (diagram 3 of 4) To fuse 27 (cjb) (diagram 4 of 4) Traction control switch Trailer tow relay battery Transmission control switch
POWER DOOR LOCKS Power Door Locks Wiring Diagram for Mercury Mountaineer 2003 List of elements for Power Door Locks Wiring Diagram for Mercury Mountaineer 2003: 49 (near breakout to c3134) s315 (near breakout to c3134) s318 (near breakout to driver safety belt buckle switch) 1/2 3/4 5/6 7/8 9/0 Battery junction box (bjb) (left side of engine compt, at fender apron) C270e C3008d C3008e C3008f Central junction box (cjb) (behind left side of dash) Central security module (behind right rear seat) Door lock/ unlock relay Driver door unlock relay Driver side door lock switch Fuse 15a Fuse 20a Fuse 30a Fuse 5a G400 (left rear of vehicle) G401 (at right "d" pillar) G401 (at right ``d" pillar) Hot at all times Interior lights system Key pad switch assembly Left front door lock actuator Left rear door lock actuator Liftgate door lock switch Liftgate lock actuator Lock Lock relay Micro processor Passenger side front door lock unit Red Right front door lock actuator Right rear door lock actuator S205 S259 S308 S312 (near breakout to passenger's safety belt buckle switch) S502 S602 Unlk Unlock relay Vbatt Vpwr
POWER MIRRORS Electronic Day/Night Mirror Wiring Diagram for Mercury Mountaineer 2003 List of elements for Electronic Day/Night Mirror Wiring Diagram for Mercury Mountaineer 2003: 12 Auto-dimming interior mirror unit C270a Central junction box (cjb) (behind left side of dash) Digital transmission range (dtr) sensor (lower left side of automatic transmission) Exterior lights system Fuse 7.5a G400 (left rear of vehicle) Gnd Hot in start or run S309 (in window regulator jumper assembly, near breakout to driver safety belt buckle switch) S900 Vpwr Power Mirrors Wiring Diagram for Mercury Mountaineer 2003 List of elements for Power Mirrors Wiring Diagram for Mercury Mountaineer 2003: 20 C270a Central junction box (cjb) (behind left side of dash) Defogger system Down Exterior rear view mirror switch Fuse 5a G401 (at right ``d" pillar) Hot at all times Interior lights system Left Left exterior rear view mirror Left/ right Mirror motor Red Right Right exterior rear view mirror S501 (in window regulator jumper assembly, near breakout to driver's side door lock switch) S502 Up/ down m W/ puddle lamps
POWER SEATS Adjustable Pedal Wiring Diagram for Mercury Mountaineer 2003 List of elements for Adjustable Pedal Wiring Diagram for Mercury Mountaineer 2003: 18 (near breakout to central junction box) (near breakout to instrument cluster) s213 (not used) Adjustable pedal motor (on pedal assembly, left of brake pedal) Adjustable pedal switch (behind left side of dash) Battery junction box (bjb) (left side of engine compt, at fender apron) Fuse 30a Fwd G200 (at right "a" pillar) G400 (left rear of vehicle) Hot at all times Interior lights system Power seats circuit Red Rwd S214 S221 S313 Driver Power Seat Wiring Diagram for Mercury Mountaineer 2003 List of elements for Driver Power Seat Wiring Diagram for Mercury Mountaineer 2003: 15 C270a Central junction box (cjb) (behind left side of dash) Dn up Entire seat Forward/rearward Fuse 30a G400 (left rear of vehicle) Hot at all times Left power seat motor assembly Left power seat switch Nca Red Rwd fwd Up/down front Up/down rear Heated Seats Wiring Diagram, Early Production for Mercury Mountaineer 2003 List of elements for Heated Seats Wiring Diagram, Early Production for Mercury Mountaineer 2003: 32 (at right "d" pillar) g401 (under left dash panel) electronic automatic temperature control (eatc) module C228b C270a Central junction box (cjb) (behind left side of dash) Driver side front heated seat module (in driver seat) Driver side seat back heater Driver side seat cushion heater Driver side seat heater switch Fuse 10 10a Fuse 2 20a G400 (left rear of vehicle) Gnd Heater feed Heater ret Hot at all times Hot in start or run Ind Nca Passenger side front heated seat module (in passenger's seat) Passenger side seat back heater Passenger side seat cushion heater Passenger side seat heater switch Red S300 S306 S316 Sens feed Sens ret Sw input Vbatt Voltage Heated Seats Wiring Diagram, Late Production for Mercury Mountaineer 2003 List of elements for Heated Seats Wiring Diagram, Late Production for Mercury Mountaineer 2003: 17 (in seat control feed jumper harness, near breakout to c3051) s348 (in seat control feed jumper harness, near breakout to left power seat switch) s314 C228b C270a Central junction box (cjb) (behind left side of dash) Driver side seat back heater Driver side seat cushion heater Driver side seat heater switch Electronic automatic temperature control (eatc) module (under left dash panel) Fuse 20a G400 (left rear of vehicle) Hot in start or run Nca Passenger side seat back heater Passenger side seat cushion heater Passenger side seat heater switch S316 Passenger Power Seat Wiring Diagram for Mercury Mountaineer 2003 List of elements for Passenger Power Seat Wiring Diagram for Mercury Mountaineer 2003: 16 (at right "d" pillar) g401 Adjustable pedal switch (behind left side of dash) Battery junction box (bjb) (left side of engine compt, at fender apron) Dn up Entire seat Forward/rearward Fuse 30a Hot at all times Nca Red Right power seat motor assembly Right power seat switch Rwd fwd S313 Up/down front Up/down rear
POWER TOP/SUNROOF Power Top/Sunroof Wiring Diagram for Mercury Mountaineer 2003 List of elements for Power Top/Sunroof Wiring Diagram for Mercury Mountaineer 2003: 23 Acce- ssory delay relay Battery junction box (bjb) (left side of engine compt, at fender apron) C270a C270c C270f Central junction box (cjb) (behind left side of dash) Circuit breaker 47 30a Down/ open Early prod Fuse 20a G400 (left rear of vehicle) Hot at all times Late prod, w/ medium overhead console Ptc 6a Roof opening panel motor assembly Roof opening panel switch S262 S900 Tan/red Up/ close Vbatt Vpwr W/ medium overhead console)
POWER WINDOWS Power Windows Wiring Diagram for Mercury Mountaineer 2003 List of elements for Power Windows Wiring Diagram for Mercury Mountaineer 2003: 39 (in window regulator jumper assembly, Accessory delay relay Battery junction box (bjb) (left side of engine compartment, at fender apron) C220a C270a C270c C270e C3008e C3008f C504a C504b Central junction box (cjb) (behind left side of dash) Central security module (behind right rear seat) Circuit breaker 47 30a Driver side front power window motor Fuse 17 15a Fuse 2 30a Fuse 6 60a G400 (left rear of vehicle) Hot at all times Instrument cluster Left rear Left rear power window motor Left rear window adjust switch Liftgate glass actuator (on center of liftgate) Liftgate glass release relay Liftgate glass release switch (in center of tailgate) Master window adjust switch Microprocessor Near breakout to passenger 1 side impact sensor) s343 One-touch down Passenger Passenger side front power window motor Passenger side window adjust switch Right rear Right rear power window motor Right rear window adjust switch S342 (in window regulator jumper assembly, near breakout to left rear speaker) S407
RADIO Base Radio Wiring Diagram for Mercury Mountaineer 2003 List of elements for Base Radio Wiring Diagram for Mercury Mountaineer 2003: 58 (at right "a" pillar) g200 Air bag contact Air bag sliding contact Air conditioning system Antenna Audio unit Audio/ climate control switch Band C175a C218a C240a C240b C270d C270f C270g Central junction box (cjb) (behind left side of dash) Circuit breaker ptc 1 6a Cruise control system Fan down Fan up Fuse 20a Fuse 5a Fused ignition G204 (at right "a" pillar) G300 (at left "a" pillar) Ground Hot at all times Hot in start Hot with acc delay relay energized Illum return Interior lights system L front spkr (+) L front spkr (-) L rear spkr (+) L rear spkr (-) Left front speaker Left rear speaker Nca Next Power Powertrain control module (pcm) (at right side engine bulkhead) R front spkr (+) R front spkr (-) R rear spkr (+) R rear spkr (-) Right front speaker Right rear speaker S168 (in dash panel to engine harness, near breakout to left horn) S229 S230 S262 Tan Temp down Temp up Vehicle speed Vol down Vol up Windshield wiper motor (on left side of engine compt, on inner fender well) Premium Sound Radio Wiring Diagram for Mercury Mountaineer 2003 List of elements for Premium Sound Radio Wiring Diagram for Mercury Mountaineer 2003: 61 (at right "a" pillar) g200 Air bag contact Air bag sliding contact Air conditioning system Antenna Audio unit Audio/ climate control switch Band C175a C218a C240a C240b C240c C270d C270f C270g Central junction box (cjb) (behind left side of dash) Cruise control system Fan down Fan up Fuse 20a Fuse 5a Fused ignition G204 (at right "a" pillar) G300 (at left "a" pillar) Ground Hot at all times Hot in start Hot with acc delay relay energized Illum return Interior lights system L front spkr (+) L front spkr (-) L rear spkr (+) L rear spkr (-) Left front speaker Left rear speaker Nca Next Power Powertrain control module (pcm) (at right side engine bulkhead) Ptc 1 6a R front spkr (+) R front spkr (-) R rear spkr (+) R rear spkr (-) Right front speaker Right rear speaker S168 (in dash panel to engine harness, near breakout to left horn) S229 S230 S262 Shield Subwoofer amplifier (behind right rear seat) Tan Temp down Temp up Vehicle speed Vol down Vol up Windshield wiper motor (on left side of engine compt, on inner fender well) Rear Seat Entertainment Wiring Diagram for Mercury Mountaineer 2003 List of elements for Rear Seat Entertainment Wiring Diagram for Mercury Mountaineer 2003: 80 (at right "a" pillar) g200 (in radio jumper harness near breakout to c237) (near breakout to left horn) s168 Air bag contact Air bag sliding contact Air conditioning system Antenna Asyson Audio system on Audio unit Audio/ climate control switch Band C175a C218a C240a C240b C270d C270f C270g C420c Central junction box (cjb) (behind left side of dash) Cruise control system Dvd left + Dvd left - Dvd player Dvd right + Dvd right - Fan down Fan up Fuse 20a Fuse 5a Fused ignition G204 (at right "a" pillar) G300 (at left "a" pillar) Ground Hot at all times Hot in start Hot with acc delay relay energized Illum Illum return Interior lights system L front spkr (+) L front spkr (-) L rear spkr (+) L rear spkr (-) Left front speaker Left rear speaker Nca Next Power Powertrain control module (pcm) (at right side engine bulkhead) Premium sound radio circuit Protocol a Protocol b Ptc 1 6a R front spkr (+) R front spkr (-) R rear spkr (+) R rear spkr (-) Red Right front speaker Right rear speaker S229 S230 S262 S265 S266 S267 (in radio jumper harness near breakout to c237) Shield Spkr lf+ Spkr lf- Spkr rt+ Spkr rt- Tan Temp down Temp up Vehicle speed Vol down Vol up Windshield wiper motor (on left side of engine compt, on inner fender well)
SHIFT INTERLOCK Shift Interlock Wiring Diagram for Mercury Mountaineer 2003 List of elements for Shift Interlock Wiring Diagram for Mercury Mountaineer 2003: 37 (in dash panel to engine harness, near breakout to windshield wiper motor) s120 (w/ ivd) (w/o ivd) All times Battery junction box (bjb) (left side of engine compt, at fender apron) Brake pedal position switch (above brake pedal) Brake shift interlock C175a C220a C220b C270d C270e C270f Central junction box (cjb) (behind left side of dash) Computer data lines system Fuse 13 5a Fuse 15 15a Fuse 23 15a Fuse 23 30a Fuse 26 7.5a G200 (at right "a" pillar) Hot at Hot in start Ignition switch Instrument cluster Joint connector 1 (in battery junction box) Key removal inhibit solenoid Microprocessor Nca O/d off Or run Powertrain control module (at right side engine bulkhead) S179 (in dash panel to engine harness, near breakout to windshield wiper motor) S223 S232 (in main harness, near breakout to central junction box) Transmission control switch W/ dual zone eatc
STARTING/CHARGING Charging Wiring Diagram for Mercury Mountaineer 2003 List of elements for Charging Wiring Diagram for Mercury Mountaineer 2003: 31 Acc Battery Battery junction box (bjb) (left side of engine compt, at fender apron) C102a C175a C220a C220b C270h Central junction box (cjb) (behind left side of dash) Charge indicator Computer data lines system Fuse 5a G106 (left side of engine compartment) G107 (left side of engine compartment) Generator Hot at all times Ignition switch Instrument cluster Micro- processor Off Powertrain control module (pcm) (at right side engine bulkhead) Red Run S142 S143 S144 S207 Scp + Scp - Start Starter motor Starting Wiring Diagram for Mercury Mountaineer 2003 List of elements for Starting Wiring Diagram for Mercury Mountaineer 2003: 22 Acc Battery Battery junction box (bjb) (left side of engine compt, at fender apron) C175a C270b C270d Central junction box (cjb) (behind left side of dash) Digital transmission range (dtr) sensor (lower left side of automatic transmission) Fuse 10a Fuse 30a Fuse 50a G106 (left side of engine compt) G107 (left side of engine compt) Ignition switch Off Powertrain control module (pcm) (at right side engine bulkhead) Red Run S115 Start Starter motor Starter relay
SUPPLEMENTAL RESTRAINTS Supplemental Restraints Wiring Diagram (1 of 2) for Mercury Mountaineer 2003 List of elements for Supplemental Restraints Wiring Diagram (1 of 2) for Mercury Mountaineer 2003: 53 (in main harn, near breakout to audio unit) (under center console) g205 (under center console) g301 (w/ dual zone eatc) (w/ right safety canopy) Air bag ind ctrl Air bag stage 1+ Air bag stage 1- Air bag stage 2+ Air bag stage 2- Battery Battery junction box (bjb) (left side of engine compartment, at fender apron) C1117 C220a C220b C228b C270e C310a C310b Central junction box (cjb) (behind left side of dash) Data bus Data link connector (dlc) (partial) (behind left side of dash) Driver 1 side impact sensor (under driver's seat) Driver safety belt buckle pretensioner (left "b" pillar) Driver's safety belt buckle switch (under driver's seat) Electronic automatic temperature control (eatc) module (under left dash panel) Fuse f1.15 15a Fuse f2.19 10a Hot at all times Hot in run or start Ignition Instrument cluster J/c 1 Logic ground Micro- processor Nca Note: 1: unbuckled 2: buckled Passenger 1 side impact sensor (under passenger's seat) Passenger safety belt buckle pretensioner (right "b" pillar) Passenger's safety belt buckle switch (under passenger's seat) Pin shorting bars engaged when module connector is disconnected from harness (shorting bars are connected between pins: 1-2, 3-4, 5-6 & 13-14 c310a 3-4 & 5-6 c310b Ref/gnd Restraint control module (rcm) (below center console) S228 S232 S261 S333 See note Shorting bar Signal Signal + Signal - Tone driver Supplemental Restraints Wiring Diagram (2 of 2) for Mercury Mountaineer 2003 List of elements for Supplemental Restraints Wiring Diagram (2 of 2) for Mercury Mountaineer 2003: 15 (w/ right safety canopy) Air bag sliding contact Driver 2 side impact sensor (left "b" pillar) (w/ right safety canopy) Driver air bag unit Front impact severity sensor (right front side of vehicle) Left safety canopy (left "b" pillar) Left seat track position sensor (under driver's seat) Nca Passenger 2 side impact sensor (right "b" pillar) (w/ right safety canopy) Passenger air bag module Resistor a (left "b" pillar) Right safety canopy (right "b" pillar) Shorting bar W/ safety canopy W/o safety canopy
TRANSMISSION 4WD Wiring Diagram, with Traction Control for Mercury Mountaineer 2003 List of elements for 4WD Wiring Diagram, with Traction Control for Mercury Mountaineer 2003: 60 (left "a" pillar) (near breakout to windshield wiper motor) s179 (right "a" pillar) g200 4wd ind 4wd sw Abs control module (left front side of engine compt) Battery junction (bjb) box (left side of engine compt) Bpp sw Brake pedal position switch (above brake pedal) C155 C175a C270d C270f C281a C281b Can bus + Can bus - Central junction box (behind left side of dash) Computer data lines system Data link connector Datalink conector (behind left side of dash) Diff lock sol Differential lock solenoid Digital transmission range sensor (left side of transmission) Exterior lights switch Four-wheel drive control module (below right side of dash) Four-wheel drive switch Fuse 15a Fuse 20a Fuse 5a G102 (left front side of engine compartment) G300 Ground High Hot at all times Hot in run or start Illum Interior lights system Low N tow sw Neutral sw Neutral tow indicator (below left side of dash) Off Pcm sig Position 1 Position 2 Position 3 Position 4 Position ind Position sw Powertrain control module (mounted through firewall) S125 S230 S246 (main harn, near c238 breakout) S263 Sig return Transfer case Transfer case assembly Ubp diag Vbatt 4WD Wiring Diagram, without Traction Control for Mercury Mountaineer 2003 List of elements for 4WD Wiring Diagram, without Traction Control for Mercury Mountaineer 2003: 67 (left "a" pillar) g300 (near c350 (breakout) (near windshield wiper motor breakout) (right "a" pillar) g200 4wd ind 4wd sw Abs control module (left front side of engine compt) Abs sig Battery junction (bjb) box (left side of engine compt) Bpp sw Brake pedal position switch (above brake pedal) C155 C175a C270d C270f C281a C281b Central junction box (behind left side of dash) Computer data lines system Data link connector Datalink conector (behind left side of dash) Diff lock sol Differential lock solenoid Digital transmission range sensor (left side of transmission) Exterior lights switch F speed sens Four-wheel drive control module (below right side of dash) Four-wheel drive switch Front speed sensor Fuse 15a Fuse 20a Fuse 5a G102 (left front side of engine compartment) Ground High Hot at all times Hot in run or start Illum Interior lights system Low N tow sw Neutral sw Neutral tow indicator (below left side of dash) Off Pcm sig Position 1 Position 2 Position 3 Position 4 Position ind Position sw Powertrain control module (mounted through firewall) R speed sens Rear speed sensor S120 S125 S200 S201 S230 S246 (main harn, near c238 breakout) S263 Sens return Sig return Transfer case Transfer case assembly Ubp diag Vbatt A/T Wiring Diagram for Mercury Mountaineer 2003 List of elements for A/T Wiring Diagram for Mercury Mountaineer 2003: 90 (4.0l) (4.6l) (behind left side of dash) data link connector (left front side of engine compt) (mounted through firewall) powertrain control module (near cjb breakout) (near differential pressure feedback egr sensor breakout) (near pcm breakout) s101 (near pcm breakout) s102 (near right wheel speed sensor breakout) (right rear side of engine compt) 4wd 4wd circuit Battery junction (bjb) box (left side of engine compt) Brake in Brake pedal position switch (above brake pedal) C175a C175b C175c C220a C220b C270d C270f Central junction box (behind left side of dash) Cht Cylinder head temperature sensor (4.6l) (top front of cylinder head) Digital transmission range sensor (left side of transmission) Dlc Ect Engine controls system Engine coolant temperature sensor (4.0l) (top right of engine) Fuse 15a Fuse 40a Fuse 5a G101 G104 G105 Ground Heated o2 sensors, vapor management valve, evr solenoid valve Hot at all times Hot in run or start Instrument cluster Intermediate shaft speed sensor (left side of transmission) Iss Joint connector (part of battery junction box) Nca O/d off Oss Output shaft speed sensor (left rear of transmission) Pcm power diode Pcm power relay Pcs a Pcs b Pcs c Power Pressure control solenoids Red Return S105 S120 S129 S130 (near a/c clutch cycling pressure switch breakout) S132 S210 S211 Scp+ Scp- Shift solenoids Sig rtn Ss a Ss b Ss c Ss d Tcc sol Tcs Tft Throttle postion sensor (top of throttle body) Torque conv clutch solenoid Tps Tr1 Tr2 Tr3a Tr4 Trans- mission control switch (end of shift lever) Transmission fluid temperature sensor Transmission solenoid body assembly Tss Turbine shaft speed sensor (left side of transmission) V ref Vbatt
WARNING SYSTEMS Key Reminder & Seat Belt Warning Wiring Diagram for Mercury Mountaineer 2003 List of elements for Key Reminder & Seat Belt Warning Wiring Diagram for Mercury Mountaineer 2003: 60 (behind left side of dash) data link connector 81 Battery junction box (bjb) (left side of engine compt, at fender apron) Breakout to central security module) C205a C220a C220b C270e C270h C3008d C3008e C3008f C310a C310b Central junction box (cjb) (behind left side of dash) Central security module (behind right rear seat) Driver safety belt buckle switch (under driver seat) Driver side rear door ajar switch Fuse 10a Fuse 15a Fuse 30a Fuse 5a G102 (left front of engine compt) G205 (under center console) G301 (under center console) G400 (left rear of vehicle) G401 (at right "d" pillar) Head Hot at all times Hot in start or run Ignition switch Instrument cluster J/c Joint connector 1 (in battery junction box) Key in ignition switch Left front door ajar switch Liftgate ajar switch (lower center of liftgate) Liftgate glass ajar switch (in center of tailgate) Main light switch Micro- processor Nca Off Park Pass- enger safety belt buckle switch (under passenger seat) Passenger side rear door ajar switch Rear auxiliary junction box (on rear "d" pillar) Restraints control module (below center console) Right front door ajar switch S125 S232 (w/ dual zone eatc) S246 (in main harness, near breakout to c238) S259 S261 S307 (in window regulator jumper assembly, near S333 S407 S503 S602 Tan Washer fluid level switch (right front of engine compt) Tire Pressure Monitoring Wiring Diagram for Mercury Mountaineer 2003 List of elements for Tire Pressure Monitoring Wiring Diagram for Mercury Mountaineer 2003: 17 "d" pillar) (in main harn, near breakout to central junction box) C270a C270e Central junction box (cjb) (behind left side of dash) Data link connector (behind left side of dash) Fuse 5a G401 (at right Horns system Hot at all times Hot in run or acc Low tire pressure module (under passenger dash panel) S210 S211 Scp + Scp - Vbatt
WIPER/WASHER Front Wiper/Washer Wiring Diagram for Mercury Mountaineer 2003 List of elements for Front Wiper/Washer Wiring Diagram for Mercury Mountaineer 2003: 32 (left rear side of vehicle) (on left side of engine compt, on inner fender well) windshield wiper motor 1. off 2. interval 1 3. interval 2 4. interval 3 5. interval 4 6. interval 5 7. low 8. high Battery junction box (bjb) (left side of engine compt, at fender apron) C175a C202a C270b Central junction box (cjb) (behind left side of dash) Front washer pump relay Fuse 21 30a Fuse 4 5a G101 (left front of engine compt) G102 (left front of engine compt) G300 (at left "a" pillar) G403 Hall sensor Hot at all times Hot in run or acc Interval switch Microprocessor Multi- function switch Powertrain control module (right side of engine bulkhead) Rear washer pump relay Rear wiper motor assembly S125 S168 (near breakout to left horn) S219 S415 Washer switch Windshield washer pump motor (in washer reservoir) Wiper high/low relay Wiper run/park relay Rear Washer/Wiper Wiring Diagram for Mercury Mountaineer 2003 List of elements for Rear Washer/Wiper Wiring Diagram for Mercury Mountaineer 2003: 27 1. off 2. variable 3. low 4. wash Battery junction box (bjb) (left side of engine compt, at fender apron) C202a C270a Central junction box (cjb) (behind left side of dash) Front washer pump relay Fuse 15 5a Fuse 30 20a G101 (left front of engine compt) G300 (at left "a" pillar) G400 (left rear of vehicle) G403 (left rear of vehicle) Hot at all times Hot in run or acc Intermittent wipe Microprocessor Multi- function switch Park Rear washer pump relay Rear wiper motor assembly Rear wiper relay Run S219 S415 Windshield washer pump motor (in washer reservoir) Windshield wiper motor (on left side of engine compt, on inner fender well)
