Diagram sections — 29 (52 total)
AIR CONDITIONING ANTI-LOCK BRAKES ANTI-THEFT COMPUTER DATA LINES COOLING FAN CRUISE CONTROL DEFOGGERS ELECTRONIC POWER STEERING ELECTRONIC SUSPENSION ENGINE PERFORMANCE EXTERIOR LIGHTS GROUND DISTRIBUTION HEADLIGHTS HORN INSTRUMENT CLUSTER INTERIOR LIGHTS POWER DISTRIBUTION POWER DOOR LOCKS POWER MIRRORS POWER SEATS POWER WINDOWS RADIO SHIFT INTERLOCKS STARTING/CHARGING SUPPLEMENTAL RESTRAINTS TRANSMISSION TRUNK, TAILGATE, FUEL DOOR WARNING SYSTEMS WIPER/WASHER
AIR CONDITIONING Automatic A/C Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Automatic A/C Wiring Diagram for Mercury Grand Marquis LS 1999: 69 (behind right kick panel, near door sill) g201 (front of right front fender apron, right side of battery) g102 (in engine harness, near breakout to in-line connector, left rear corner of engine compartment, rear of wheelwell) s129 (in main harness, near breakout to day/night amplifier sensor) s226 (not used) (rear center of engine) g106 87a A/c clutch cycling pressure switch (right rear of engine compartment, on a/c accumulator) A/c clutch output A/c compressor clutch coil A/c high pressure cut out switch (right side of engine compartment, near fuse box) A/c wot cutout relay Amb temp sens input Ambient temperature sensor (center front of vehicle, on front of upper radiator support) Battery Blend door (cool) Blend door (heat) Blend door actuator (behind right side of dash, top of a/c plenum) Blend door pot gnd Blend dr feedback Blower motor Blower motor speed controller (top right center of firewall, on evaporator assembly) Blower mtr output Blower speed fback C227 C228 Circuit breaker 17 30a Computer data lines system Connector behind right side of dash) s204 Cooling fan (front of engine compartment) Cooling fan high relay Cooling fan low relay Data E/m converter Electronic automatic temperature control (eatc) module (behind center of dash) Engine compartment fuse box Engine compartment fuse box (right front of engine compartment, behind battery) Front panel illum Fuse 13 50a Fuse 15a Fuse 30a Ground High current relay center (right rear of engine compartment) Hot at all times Hot at all times Hot in run I/p fuse panel In car temp sens In-car temperature sensor (behind top center of dash) Inst illumination Instrument cluster (digital) Interior lights system Near door sill) g203 Pcm power relay Power Powertrain control module (pcm) (behind left side of dash, on left side of firewall) Red Reference voltage Relay center (left side of engine compartment) Relay signal S116 (in dash panel to headlamp junction harness, near breakout to in-line connector, inside front of right front fender) S139 S157 (in engine harness, near breakout to g102) S206 (in main harness, near breakout to glove box lamp) S227 (in main harness, in breakout to lighting control module) S251 (in main harness, in breakout to eatc) Sensor ground Sun load sensor (top right side of dash, above glove box) Sunload sens input Manual A/C Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Manual A/C Wiring Diagram for Mercury Grand Marquis LS 1999: 53 (behind right kick panel, near door sill) g201 (behind right kick panel, near door sill) g203 (center rear of engine) g106 (front of right front fender apron, right side of battery) g102 (not used) 87a A/c clutch cycling pressure switch (right rear of engine compartment, on a/c accumulator) A/c compressor clutch coil A/c high pressure cut out switch (right side of engine compartment, near fuse box) A/c wot cutout relay A/c-heater mode switch Blend door actuator (behind right side of dash, top of a/c plenum) Blower motor Blower motor resistor assembly (top right center of firewall, on evaporator assembly) Blower motor switch Circuit breaker 17 30a Cold Cooling fan (front of engine compartment) Cooling fan high relay Cooling fan low relay Def Engine compartment fuse box Engine compartment fuse box (right front of engine compartment, behind battery) Floor Fuse 13 50a Fuse 5 15a Fuse 9 30a High current relay center (right rear of engine compartment) Hot at all times Hot in run I/p fuse panel Lamp) Max a/c Med hi Med lo Mix Norm a/c Off Pcm power relay Powertrain control module (pcm) (behind left side of dash, on left side of firewall) Red Relay center (left side of engine compartment) S116 (in dash panel to headlamp junction harness, near breakout to g102, right side of battery) S129 (in engine harness, near breakout to in line connector, left rear corner of engine compartment) S139 S157 (in engine harness, near breakout to a/c compressor clutch coil) S206 (in main harness, near breakout to glove box lamp) S226 (in main harness, near breakout to day/night sensor amplifier) S239 (in main harness, near breakout to in-line connector, right rear of engine compartment) Solid state Temperature control potentiometer Vent Warm
ANTI-LOCK BRAKES Anti-lock Brake Wiring Diagrams for Mercury Grand Marquis LS 1999 List of elements for Anti-lock Brake Wiring Diagrams for Mercury Grand Marquis LS 1999: 42 (left rear of engine compt harness) (near primary crash sensor) Anti- lock ind Anti-lock brake module (left front of upper radiator support) Battery Battery junction box (right front of engine compartment, behind battery) Brake pedal position (bpp) switch (top of brake pedal support) Brake sw in Central junction box (left of steering column) Computer data lines system Digital cluster analog cluster Evac and fill connector (left front wheelwell) Fuse 10a Fuse 15a Fuse 50a G101 (front of right fender) Ground Hot at all times Hot in run Ign Ignition Ind control Left front brake sensor (brake ass'y) Left rear brake sensor (brake ass'y) Lf sensor Lr sensor Multiplex Nca Power Red/pnk Rf sensor Right front brake sensor (brake ass'y) Right rear brake sensor (brake ass'y) Rr sensor S112 S132 S146 S231 Trac ctrl Tract asst ind Traction control switch Warning lamps module or instrument cluster
ANTI-THEFT Anti-theft Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Anti-theft Wiring Diagram for Mercury Grand Marquis LS 1999: 29 (1999, 2000) (1999, 2000) (2001) (2001) (main harn, near breakout to dlc) Battery Bus (+) Bus (-) Central junction block (below dash, left of steering column) Data link connector (behind left side of dash) Day/night sensor/ amplifier Fuse 15a Fuse 25a G203 (behind right kick panel) Ground Hot at all times Hot in run or start Ignition Passive anti-theft system control module (behind left side of dash) Passive anti-theft system transceiver module (behind left side of dash) Pats ind Receive Rf power S210 S223 S227 S285 S296 S297 Transmit
COMPUTER DATA LINES Computer Data Lines for Mercury Grand Marquis LS 1999 List of elements for Computer Data Lines for Mercury Grand Marquis LS 1999: 29 (front of right front fender apron) g101 (main harn, near breakout to alternator connector) s134 (main harn, near breakout to data link connector) s297 Air bag electronic crash sensor (above glove box) Anti-lock brake module (on front of upper radiator support) C162 C2027 C276 C518 Data link connector (dlc) (behind left side of dash) Dlc Dlc (+) Dlc (-) Driver's door module (left front door) Electronic automatic temperature control module (ex natural gas) (center of dash) Engine compartment fuse box Evac and fill connector (left front wheelwell) Fuse 30a G203 (behind right kick panel) Hot at all times Lighting control module (lcm) (behind left side of dash) Natural gas vehicle (ngv) module (natural gas only) (on front of radiator support) Passive anti- theft module (behind left side of dash) Powertrain control module (pcm) (on left side of firewall) S100 S135 S204 S271 (main harn, near breakout to data link connector) S296 (main harn, near breakout to data link connector)
COOLING FAN Cooling Fan Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Cooling Fan Wiring Diagram for Mercury Grand Marquis LS 1999: 16 (front of right front fender apron, right side of battery) g102 (in dash panel to headlamp junction harness, near breakout to in-line connector, inside front of right front fender) Circuit breaker 17 30a Cooling fan (front of engine compartment) Cooling fan high relay Cooling fan low relay Engine compartment fuse box Engine compartment fuse box (right front of engine compartment, behind battery) Fuse 13 50a High current relay center (right rear of engine compartment) Hot at all times Pcm power relay Powertrain control module (pcm) (behind left side of dash, on left side of firewall) Red Relay center (left side of engine compartment) S116
CRUISE CONTROL Cruise Control Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Cruise Control Wiring Diagram for Mercury Grand Marquis LS 1999: 40 Air bag sliding contact Battery junction box Brake pedal position (bpp) switch (top of brake pedal support) Brake press C238 C254 C283 Central junction box Coast Ctrl sw rtn Ctrl sw sig Digital cluster only Fuse 15a G203 (behind right kick panel) Ground Horn relay (in battery junction box) Horn switches Hot at all times Hot in acc or run Ind output Instrument cluster Lighting control module Nca Off Ohms Power Resume S105 S2009 S210 S243 (near breakout to multifunction switch) S247 (behind center of dash) S265 Set/ accel Speed control deac switch (below brake fluid reser- voir) Speed control servo assembly (left rear corner of engine compt) Speed control switch assembly Stop lp sig Vehicle speed sensor (vss) (left rear side of trans) Vss input
DEFOGGERS Defogger Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Defogger Wiring Diagram for Mercury Grand Marquis LS 1999: 25 (behind left kick panel) (main harn, near breakout to multi-function switch) 87a Battery junction box C2000 C2026 Central junction box Defogger relay (in battery junction box) Defrost on/off switch Defrost relay fuse 14 40a G200 Heated backlight relay output Heated backlight switch Hidden antenna module (right front of trunk) Hot at all times Interior lights system Lighting control module (behind left side of dash) Nca On ind. Rear defrost fuse 17 10a Rear window defrost control Rear window defroster grid S153 S207 Switch illum.
ELECTRONIC POWER STEERING Electronic Power Steering Wiring Diagram, with Air Suspension for Mercury Grand Marquis LS 1999 List of elements for Electronic Power Steering Wiring Diagram, with Air Suspension for Mercury Grand Marquis LS 1999: 33 (1999-00) (2001) Air suspension/ evo steering module (above glove box) Battery Battery junction box (behind battery) C215 C216 Central junction box (left of steering column) Evo act ouput + Evo act ouput - Evo actuator (on power steering assembly) Fuse 15a Fuse 30a G203 (behind right kick panel) Ground Hot at all times Hot in run Ignition Mirrors system Nca Red Rot rate input S105 S208 S210 S226 S247 (main harn, near breakout to front control unit) S274 S411 Steering wheel rotation sensor (bottom of steering column) Vehicle speed sensor (vss) (left rear of transmission) Vss input + Vss input - Electronic Power Steering Wiring Diagram, without Air Suspension for Mercury Grand Marquis LS 1999 List of elements for Electronic Power Steering Wiring Diagram, without Air Suspension for Mercury Grand Marquis LS 1999: 28 (1999-00) (2001) 15a Central junction box (left of steering column) Diag input Electronic variable orifice (evo) steering module (above glove box) Evo act ouput + Evo act ouput - Evo actuator (on power steering assembly) Evo test connector (right side of trunk) Fuse G203 (behind right kick panel) Ground Hot in run Ignition Mirrors system Nca Red Rot rate input S105 S208 S210 S226 S247 (main harn, near breakout to front control unit) S274 Steering wheel rotation sensor (bottom of steering column) Vehicle speed sensor (vss) (left rear of transmission) Vss input + Vss input -
ELECTRONIC SUSPENSION Electronic Suspension Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Electronic Suspension Wiring Diagram for Mercury Grand Marquis LS 1999: 60 (1999-00) (2001) (body harn, near breakout to malfunction switch) (in main harn, near breakout to front control unit) s247 (near breakout to right rear speaker) s431 Air suspension compressor motor and vent solenoid (below air cleaner assembly) Air suspension indicator Air suspension relay Air suspension switch (left side of trunk) Air suspension test connector (left side of trunk) Air suspension/ evo steering module (above glove box) Analog digital Battery junction box Battery junction box (right front of engine compt, behind battery) C215 C216 C251 c254 Central junction box (below dash, left side of steering column) Comp rly Diag input Door open Driver's door module (in left front door) Evo act ctrl Evo actuator (on power steering assembly) Evo fdbk Fuse 15a Fuse 30a G101 (front of right fender apron) G203 (behind right kick panel) Ground Hot at all times Hot in run Ign on Indicator out Instrument cluster Left rear air spring solenoid (top of left air spring) Lin ht sens Linear height sensor (left rear upper control arm) Lr sol ctrl Mirrors system Nca Pnk Red Right rear air spring solenoid (top of right air spring) Rr sol ctrl S105 S112 S144 S208 S210 S234 S268 (near breakout to air bag diagnostic connector) S274 S406 S411 Serv sw St whl rot Steering wheel rotation sensor (base of steering column) Vehicle speed sensor (left rear side of transmission) Vent sol Vss in
ENGINE PERFORMANCE
4.6L 4.6L, Engine Performance Wiring Diagrams (1 of 4) for Mercury Grand Marquis LS 1999 List of elements for 4.6L, Engine Performance Wiring Diagrams (1 of 4) for Mercury Grand Marquis LS 1999: 74 (behind right kick panel) g203 (near breakout to fuel injector 8) (near breakout to ground at center rear of engine) (rear of left front fender apron) A/c cutout Air conditioning (a/c cutout sw) Battery junction box (right front of engine compt) Case gnd Central junction box (below dash, left of steering column) Ckp (+) Ckp (-) Coil 1 Coil 3 Coil 4 Coil 5 Coil 6 Cooling fans (fan high rly) Cooling fans (fan low relay) Crankshaft position sensor (lower right front of engine) Crankshaft position sensor shield Cyl temp ind Data link (+) Data link (-) Data link connector (left side of dash) Ect ind Egr vac reg Egr vacuum regulator solenoid (top center rear of engine) Eprom Fan high rly Fan low rly Fuel flow Fuel gauge Fuel pump Fuse 15a Fuse 25a Fuse 30a G104 G104 (rear of left front fender apron) Hot at all times Hot in run or start Iat sens Ignition coils Instrument cluster Intake air temperature sensor (left front of engine compt) Maf sig rtn Mil Nca Pcm power diode Pcm power relay Powertrain control module (in engine compt, on left side of firewall) Pwr gnd Radio noise capacitor (left front of engine, left side of left ignition coil) Red Relay center (left side of engine compt) Rt ho2s 12 S100 S101 S103 S119 S134 S135 (near breakout to front crash sensor) S151 S223 S276 Shft sol 1 Shft sol 2 Tcil Tr1 Tr2 Tr4 Trans ctrl sw Trans temp Transmission control switch (bottom of steering column) Vss (-) 4.6L, Engine Performance Wiring Diagrams (2 of 4) for Mercury Grand Marquis LS 1999 List of elements for 4.6L, Engine Performance Wiring Diagrams (2 of 4) for Mercury Grand Marquis LS 1999: 36 (near breakout to right heated oxygen sensor 11) (speedometer/ odometer) vehicle speed input 4r70w transmission Analog C250 C251 C255 C256 Cylinder head temp input Differential pressure feedback egr sensor (right side of intake manifold) Digital Digital transmission range sensor (dtr sensor) (left side of transmission) Electronic pressure control solenoid Engine coolant temp input Engine coolant temperature sensor (top right front of engine) Evap canister purge valve (rear center of engine compt) Fuel flow rate input G104 (rear of left front fender apron) G203 (behind right kick panel) Instrument cluster Malfunction indicator input Mass air- flow sensor (behind air cleaner assembly) R n Red S105 S119 S126 S150 S222 (near breakout to inst cluster) Shift solenoids Ss1 Ss2 Throttle position sensor (left side of throttle body) Torque converter clutch solenoid Transmission control indicator input Transmission fluid temperature sensor 4.6L, Engine Performance Wiring Diagrams (3 of 4) for Mercury Grand Marquis LS 1999 List of elements for 4.6L, Engine Performance Wiring Diagrams (3 of 4) for Mercury Grand Marquis LS 1999: 39 (center rear of trunk) g407 (in trunk, on left support) inertia fuel shutoff switch (near breakout to 12-pin conn at left rear of engine compt) (near breakout to 8-pin conn left rear of engine) (near left rear of engine compt) (near left rear of engine compt) s148 (top of brake pedal support) brake pedal position switch Air conditioning (a/c cutout relay) Battery junction box (right front of engine compt) Camshaft position sensor (left front of engine, below left ignition coil) Central junction box) (below dash, left of steering column) Cooling fans (fan low relay) Cylinder head temperature sensor (top left front of engine) Fuel pump prime connector (left sdie of engine compt) Fuel pump relay Fuel pump/ fuel gauge sender Fuel tank assembly Fuel tank pressure sensor (on upper fuel tank assembly) Fuse 15a Fuse 20a Hot at all times Left heated oxygen sensor 21 (lower left rear of engine, in exhaust manifold) Left heated oxygen sensor 22 (in exhaust, rear of catalyst) Nca Output shaft speed sensor (left rear side of transmission) Red Red/pnk Relay center (left side of engine compt) Right heated oxygen sensor 11 (lower right rear of engine, in exhaust manifold) Right heated oxygen sensor 12 (in exhaust, rear of catalyst) S115 (near breakout to 16-pin conn at left rear of engine compt) S123 S124 S125 S129 S130 S147 S265 S402 4.6L, Engine Performance Wiring Diagrams (4 of 4) for Mercury Grand Marquis LS 1999 List of elements for 4.6L, Engine Performance Wiring Diagrams (4 of 4) for Mercury Grand Marquis LS 1999: 76 (behind right side of dash) air suspension/ evo steering module (behind right side of dash) electronic variable orifice steering module (left rear of engine compt) speed control servo assembly (left rear of transmission) vehicle speed sensor (near breakout to 42-pin conn at left rear of eng compt) (near ground at center rear of engine) (rear of vehicle, left side of trunk) canister vent solenoid (right side of dash) speed chime module A/c cutout sw A/c wot cutout Air conditioning (a/c cutout rly) Air conditioning (a/c cutout sw) Batt Battery junction box (right front of engine compt) Brake on/off C204 C214 C216 C234 Cam pos in Can vent sol Cht sensor Coil 2 Coil 7 Coil 8 Dpfe sens Epc sol Evap purge vlve Fuel inj 1 Fuel inj 2 Fuel inj 3 Fuel inj 4 Fuel inj 5 Fuel inj 6 Fuel inj 7 Fuel inj 8 Fuel injectors Fuel press Fuel pump ctrl Fuse 30a G104 (rear of left front fender apron) G203 (behind right kick panel) Heater ctrl Hot at all times Iac sol Idle air control valve (left side of intake manifold) L ho2s Lft ho2s 21 Lft ho2s 22 Maf sens in Oss (+) Power Power gnd Powertrain control module (in engine compt, on left side of firewall) Pwr gnd R ho2s Red Red/pnk Ref volt Rt ho2s 11 S105 S109 (near breakout to 12-pin conn at left rear of engine compt) S119 S131 S143 S247 (near breakout to front control unit) Sig rtn Tan Tan/red Tcc sol Tp sens in Tr3 sens Vss (+) Vss (-) W/ air suspension & evo steering W/ evo steering only
EXTERIOR LIGHTS Back-up Lamps Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Back-up Lamps Wiring Diagram for Mercury Grand Marquis LS 1999: 12 (center rear of trunk) g407 Central junction box (below dash, left of steering column) Digital transmission range (dtr) sensor (on left side of transmission) Electronic day/night mirror Fuse 15a Hot in run Left reversing lamp Not used Right reversing lamp S139 S230 (main harn, near breakout to ground g200) S420 Exterior Lamps Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Exterior Lamps Wiring Diagram for Mercury Grand Marquis LS 1999: 87 (behind left side of dash) lighting control module (lcm) (center rear of luggage compartment) g407 (dash harn, in breakout to bpp switch) (dash harn, near breakout to horns) s120 (front of right front fender) g101 (left rear of luggage compt) (left side of luggage compt) s409 (main harn, in breakout to multi-function sw) (main harn, near breakout to instrument cluster) s257 (right rear of luggage compt) Analog B+ vbat 1 B+ vbat 2 B+ vbat 3 Brake pedal position (bpp) switch (top of brake pedal support) C2027 C2029 C250 C251 C256 C268 C269 Central junction block (below dash, left of steering column) Circuit breaker 20a Clock Digital Flasher power input Flasher power output Fuse 15a G101 (front of right front fender) G203 (behind right kick panel) G407 (center rear of luggage compartment) Hazard Head Headlamp switch input High mount stoplamp assembly Hot at all times Hot in run Instrument cluster Left cornering lamp Left front park/ turn lamp Left front side marker lamp Left rear park lamp 1 Left rear park lamp 2 Left rear park/stop/ turn lamp 1 Left rear park/stop/ turn lamp 2 Left turn ind License lamp Lo beams output Main light switch Multi- function switch Nca Normal Off Park Parklamp output Parklamp switch input Right cornering lamp Right front park/ turn lamp Right front side marker lamp Right rear park lamp 1 Right rear park lamp 2 Right rear park/stop/ turn lamp 1 Right rear park/stop/ turn lamp 2 Right turn ind S107 S108 S112 S113 S226 S227 S242 (in harness, behind clock) S243 (dash harn, in breakout to multi-function switch) S244 S262 S263 S265 S285 S400 S401 S413 S416 S420 S422 S442 Turn left Turn right
GROUND DISTRIBUTION Ground Distribution Wiring Diagram (1 of 3) for Mercury Grand Marquis LS 1999 List of elements for Ground Distribution Wiring Diagram (1 of 3) for Mercury Grand Marquis LS 1999: 62 (engine harn, near breakout to a/c compressor clutch coil) (near battery) A/c compressor clutch coil A/c high pressure cutout switch Air suspension compressor motor and vent solenoid Air-bag electric crash sensor Anti-lock brake module Bare Battery Battery junction box Blend door actuator Blower motor resistor assembly Blower motor speed controller Conven- tional fuel only Cooling fan Crankshaft position sensor shield Daytime running lamps module Evac and fill connector Fuel rail cutoff solenoid Function selector switch assembly G101 (front of right front fender apron) G104 (rear of left front fender apron) G111 g101 (front of right fender apron) G115 (center rear of engine) G203 (behind right kick panel) G407 (center rear of luggage compartment) Glove box lamp) Grand marquis only High current relay center High mounted stoplamp Horn assembly In breakout to electronic crash sensor) Left cornering lamp Left dash courtesy lamp Left front park/ turn lamp Left front side marker lamp Left headlamp Mass air flow sensor Natural gas only Natural gas vehicle module Of luggage compartment) Pcm power relay Police power relay Powertrain control module Relay center Right cornering lamp Right front park/ turn lamp Right front side marker lamp Right headlamp S107 (engine harn, near breakout to right cornering lamp) S108 (engine harn, near breakout to left cornering lamp) S113 (engine harn, front of right fender) S119 (body harn, near breakout to transmission) S156 (engine compt harn, near breakout to fuel rail cutoff solenoid) S157 S422 (center rear bare Starter motor relay Stop/luggage compartment lid lamp shield To s204 (diagram 2 of 3) W/ natural gas Windshield washer low fluid switch Windshield washer pump Ground Distribution Wiring Diagram (2 of 3) for Mercury Grand Marquis LS 1999 List of elements for Ground Distribution Wiring Diagram (2 of 3) for Mercury Grand Marquis LS 1999: 57 Air suspension/ evo steering module Analog cluster Base Brake fluid level switch C249 C250 C251 C262 Clock Dash cigar lighter Dash cigar lighter lamp Data link connector Day/ night sensor/ amplifier Digital cluster Digital instrument cluster Driver's door module Electronic automotic temperature control module Electronic varible orifice steering module Engine compartment lamp Engine coolant temperature sender From s206 a (diagram 1 of 3) Front control unit Fuel tank assembly Function selector switch assembly G200 (behind left kick panel) G203 (behind right kick panel) Ignition switch In breakout to instrument cluster) Instrument cluster Lighting control module Main light switch Message center switch assembly Ngv, manual a/c, analog cluster w/eatc, analog cluster w/p100l radio Others Passive anti-theft system module Police option Powertrain control module Premium Rear window defrost control Right dash courtesy lamp S203 (dash harn, near breakout to g200 at left kick panel) S204 (dash harn, right side of dash) S214 (dash harn, near breakout to brake pedal position switch) Shift lock actuator Speed chime module Speed control servo Vehicle speed sensor W/ air suspension W/ analog cluster W/ digital cluster W/ eatc W/ keyless entry W/o air suspension W/o eatc Warning lamps module Windshield wiper motor Wiper control module Ground Distribution Wiring Diagram (3 of 3) for Mercury Grand Marquis LS 1999 List of elements for Ground Distribution Wiring Diagram (3 of 3) for Mercury Grand Marquis LS 1999: 84 (body harn, left rear of luggage compt) s404 Air suspension/ evo steering module All others Conventional fuel Crown victoria only Driver's power lumbar compressor Driver's seat control switch Driver,s door module Electronic day/night mirror Electronic varible orifice steering module Emergency flasher relay 2 Emergency flasher relay block Exterior rear view mirror switch Front interior/ reading lamp Fuel tank assembly Fuel tank solenoid valve 1 Fuel tank solenoid valve 2 Fuel tank solenoid valve 3 Fuel tank solenoid valve 4 G203 (behind right kick panel) G407 (center rear of luggage compt) Grand marquis only Interior lamp Key pad switch assembly Left front door latch switch Left park/ stop/ turn lamp 1 Left park/ stop/ turn lamp 2 Left rear door latch switch Left rear park lamp 1 Left rear park lamp 2 Left rear turn signal lamp 1 Left rear turn signal lamp 2 Left rear window control switch Left reversing lamp Left vanity lamp License lamp Luggage comp- artment lid lamp Luggage compartment lid release solenoid/ ajar switch Luggage compartment lid release switch Master window/ lock control switch Natural gas Natural gas only One touch window down module Passenger's power lumbar compressor Passenger's seat control switch Police map lamp assembly Police option only Rear interior/ reading lamp Right front door latch switch Right front window/ door lock control switch Right park/ stop/ turn lamp 1 Right park/ stop/ turn lamp 2 Right rear door latch switch Right rear park lamp 1 Right rear park lamp 2 Right rear turn signal lamp 1 Right rear turn signal lamp 2 Right rear window control switch Right reversing lamp Right vanity lamp S208 (dash harn, right side of dash) S304 (body harn, near breakout to safety belt switch) S400 (body harn, left rear of luggage compt) S401 (body harn, right rear of luggage compt) S402 (body harn, left rear of luggage compt) S403 (body harn, center rear of luggage compt lid) S405 (body harn, in breakout to fuel tank solenoid 4) S420 (body harn, rear of luggage compartment) S428 (body harn, left rear of vehicle) S500 (door harn, center of left front door) S503 (door harn, center of left front door) S600 (door harn, front of right front door) Safety belt switch Seat switch Standard production Steering wheel rotation sensor W/ air suspension W/ air suspension only W/ police option W/ power seats W/ rke W/o air suspension W/o police option W/o rke
HEADLIGHTS Headlamps Wiring Diagram, with DRL for Mercury Grand Marquis LS 1999 List of elements for Headlamps Wiring Diagram, with DRL for Mercury Grand Marquis LS 1999: 94 "lamps on" adjustment (eng compt harn, near breakout to horn) (main harn, near glove box lamp breakout) s290 (main harness, near breakout at right kick panel) s269 A analog cluster Acc Aut0lamp enable Autolamp delay Autolamp on/off B digital cluster B+ (vbat 2) B+ (vbat 3) Backlighting Bat pwr Battery junction box (in right front of engine compt, behind battery) Brake fluid level switch Brake in Brake ind Breakout to instrument cluster) s224 C2004 C2026 C2027 C2029 C249 C250 C256 C262 Central junction box (below dash, left of steering column) Circuit breaker 18a Day/night sensor amplifier Daytime running lamps module (on front of upper radiator support) Demand lighting out Dimmer switch Early Exit delay rheostat Flash -to- pass Fuse 15a Fuse 20a G101 (front of right front fender apron) G200 (behind left kick panel) G203 (behind right kick panel) Gnd Ground Head Headlamp input Hi beam in Hi beam indicator Hot at all times Hot in acc or run Hot in run Hot in run or start Ign (run) Ign acc or run Ign start or run Ignition switch In breakout to electronic crash sensor) Instrument cluster Interior lights system Late Left headlamp Lighting control module (behind left side of dash) Lo beam in Lo beams output Lock Low Main light switch Max Min Multi- function switch Off Only Park Park lamp input Parking brake switch (behind left side of dash, on top of parking brake assembly) Pass Right headlamp Run S112 S113 S138 (eng compt harn, near breakout to realy center) S190 S2009 S203 S204 S207 S210 S226 S262 S276 S285 Start W/ analog cluster W/ digital cluster Warning lamps module Headlamps Wiring Diagram, without DRL for Mercury Grand Marquis LS 1999 List of elements for Headlamps Wiring Diagram, without DRL for Mercury Grand Marquis LS 1999: 66 "lamps on" adjustment (eng compt harn, near horn assembly breakout) (main harn, near glove box lamp breakout) (main harness, near breakout at right kick panel) s269 A analog cluster Aut0lamp enable Autolamp delay Autolamp on/off B digital cluster B+ (vbat 2) B+ (vbat 3) Backlighting Breakout to instrument cluster) s224 C2026 C2027 C2029 C249 C250 C256 C262 Central junction box (below dash, left of steering column) Circuit breaker 18a Day/night sensor amplifier Demand lighting out Dimmer switch Early Exit delay rheostat Flash -to- pass Fuse 15a G101 (front of right front fender apron) G200 (behind left kick panel) G203 (behind right kick panel) Head Headlamp input Hi beam indicator Hot at all times Hot in acc or run Hot in run or start Ign acc or run Ign start or run Instrument cluster Late Left headlamp Lighting control module (behind left side of dash) Lo beams output Main light switch Max Min Multi- function switch Off Park Park lamp input Pass Right headlamp S112 S113 S138 (eng compt harn, near horn assy breakout) S190 S2009 S204 S207 S210 S262 S276 S285 S290 Lighting Control Module Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Lighting Control Module Wiring Diagram for Mercury Grand Marquis LS 1999: 76 (behind left right kick panel) (behind right right kick panel) (main harness, in breakout to instrument cluster) (police only) A digital cluster only All doors lock in Autolamp delay pot Autolamp enable Autolamp indic Autolamps on/off C.b. 12 18a C2026 C2027 C2029 Central junction box (below dash, left of steering column) Computer data lines system Courtesy lamps out Data link connector Decklid ajar sw Defogger system Demand lighting out Digital cluster only Dome lamp sw Door ajar out Door handle sws Door lock system (keyless entry circuit) Door locks system Driver door ajar sw Exterior lights system Flasher out Flasher power in Fuse 13 15a Fuse 4 15a Fuse 6 15a Fuse 8 15a G200 G203 Ground Hazard warn indic Headlamp sw Headlights system Horn relay out Horns system Hot at all times Hot in acc or run Hot in run or start Instrument cluster system Interior lights system Key-in-ignition sw Lighting control module (lcm) (behind left side of dash) Low beams out Panel dim down sw Panel dim up sw Panic alarm in Parklamp out Parklamp sw Pass door ajar sw Power (battery) Power (ignition) Pulse width dim out Rear defog relay Rear defog sw S2009 S204 S207 S227 S262 S276 S284 a S285 Seat belt fastened sw Seat belt indic out Tone request Trunk, tailgate, fuel doors system Variable volt dimming Warning systems
HORN Horn Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Horn Wiring Diagram for Mercury Grand Marquis LS 1999: 19 (front of right fender apron) g101 87a Battery junction box Battery junction box (behind battery) C2026 C234 Clockspring assembly Control switch return Cruise control system Fuse 15a Horn Horn assembly (behind left center of grille) Horn relay Hot at all times Lighting control module (lcm) (behind left side of dash) Nca S112 Speed control servo assembly (left rear corner of engine compartment) Switches
INSTRUMENT CLUSTER Analog Cluster Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Analog Cluster Wiring Diagram for Mercury Grand Marquis LS 1999: 181 "air bag" "anti-lock" "fail-safe cooling" "traction (1999- (2001) (1999-00) (2001) (behind left (behind left side (behind left side of dash) (behind right (behind right side of dash, (below dash, (body harn, behind (body harness, behind (check engine) (engine harn, (in engine compt, (in right (left side of (main (main harn, (main harn, left (on brake (on front of upper (on left front of upper (on left rear side (on lower left (on rear of (on top right front (qty. 6) 00) 10a 15a 30a Above glove box) Above oil filter) Acc Air Air suspension Air suspension/evo steering module Airbag indicator Anti-lock brake module Anti-slosh Assembly Assist" At all Battery Behind Behind battery) Belts indicator Box Brake Brake assembly) Brake fluid C2029 C215 C250 C251 C261 C277 C459 Center of dash) Central Charge Column) Control Daytime running Dimming output Ect sensor in Electronic Electronic crash sensor Engine compt) Engine compt, Engine coolant Engine oil Engine oil pressure Exterior Fail-safe cooling Fasten Firewall) Fluid Front of Fuel Fuel injector 1) Fuel level in Fuel tank) Fuse Fuse 8 G200 G203 G203 (behind right Gauge Generator Gnd Guage Harn, Headlights system Hi beam Hot Hot in Ignition switch Illumination lamps In run Indicator Indicator control Indicator out Indicator output Instrument cluster Junction Kick panel) Lamps (drl) module Left of Left rear of Left side Left turn Level switch Lighting control module Lights Lock Low Low fuel Malfunction Mil output Module Module (pcm) Nca Normal Odometer Of dash) Of dash, on top Of engine, near Of parking Of transmission) Off Ohms On left side of Or run Park brake Powertrain control Pressure switch Radiator support) Reservoir) Restraints control module Right side Right side of dash) Right turn Run S105 S144 S202 S204 S207 S209 S210 S222 S231 S234 S276 S287 Sensor Side of dash) Side of engine, Speed Speedometer/ Start Steering Suspension Switch System Tank Tcil Temperature Temperature sender Test connector Times Traction ind out Transmission Trunk) Vehicle Voltmeter Electronic Cluster Wiring Diagram (2 of 2) for Mercury Grand Marquis LS 1999 List of elements for Electronic Cluster Wiring Diagram (2 of 2) for Mercury Grand Marquis LS 1999: 62 "a" pillar) (behind left side of dash) (behind right (behind right side of dash, (body harn, (body harn, near (left front door) (main harn, (main harn, near Above glove box) Air suspension Airbag diagnostic Ajar Ajar lamp output Ajar switch Behind left Breakout to C2026 C2027 C2029 C216 C518 Closed Connector) Decklid jar Door Door ajar Driver's ajar switch Driver's door Evo steering module Front G203 Input Kick panel) Latch Left Lid Lid release Lighting control module Lighting ctrl Luggage compt Module Module) Nca Near right Pass. ajar switch Rear Right S259 S268 S273 S277 S304 S403 S500 S600 Seat belt Seatbelt ind out Seatbelt switch Solenoid/ Switch Tone request Electronic Cluster Warning Lamps Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Electronic Cluster Warning Lamps Wiring Diagram for Mercury Grand Marquis LS 1999: 37 (1999-00) (1999-00) (2001) (2001) 1999-00 Acc Air bag ind Anti- lock ind Anti-lock brake module (on left front of upper radiator support) Anti-lock brake system (abs) module (on left front of upper radiator support) Brake fluid level switch Brake indicator C162 C2026 C261 Central junction box Daytime running lamps (drl) module (on front of upper radiator support) Fuse 15a G200 (behind left kick panel) G203 (behind right kick panel) Gnd Ground Hazard warning indicator Hot in start or run Ignition switch Lighting control module (behind left side of dash) Lock Off Parking brake switch (behind left side of dash, on top of parking brake assembly) Restraints control module (rcm) (behind right side of dash, above glove box) Run S203 S207 S209 (body harn, behind right side of dash) S276 Start Traction assist ind Warning lamps module
INTERIOR LIGHTS Courtesy Lamps Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Courtesy Lamps Wiring Diagram for Mercury Grand Marquis LS 1999: 65 (behind right kick panel) (body harn, near right "a" pillar) s259 (body harn, right side of dash) s238 (main harn, near message center switch assembly breakout) s236 (near luggage compartment lid switch breakout) s448 (roof harn, near center of right "a" pillar) (roof harn, near front interior/ reading lamp breakout) s900 All others B (+) C2026 C2027 C2029 C262 Central junction box Circuit breaker 20a Demand out Door ajar Engine compartment lamp (ngv & police option) For connection to left deck lamp For connection to right deck lamp Front interior/ reading lamp Fuse 15a G203 G203 (behind right kick panel) Glove box lamp Handle sw Headlights system Hot at all times Interior lamp Lamps out Left dash courtesy lamp Left front door handle switch Left front door latch switch Left rear door latch switch Left vanity lamp Lighting control module (lcm) (behind left side of dash) Luggage compartment lid lamp Luggage compartment lid switch Main light switch Nca Police map lamp assembly (center of windshield header) Police option Rear flasher (center rear of trunk) Rear interior/ reading lamp (grand marquis only) Right dash right dash courtesy courtesy lamp lamp Right front door handle switch Right front door latch switch Right rear door latch switch Right vanity lamp S204 S206 S208 S216 (near brake pedal position switch breakout) S227 S262 S290 (main harn, near glove box lamp breakout) S500 S600 S901 S902 Standard production Switch input Trunk ajar Trunk lid release solenoid/ ajar switch W/o keyless entry Instrument Illumination Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Instrument Illumination Wiring Diagram for Mercury Grand Marquis LS 1999: 68 (behind left kick panel) (behind right kick panel) (body harn, near left power heated mirror breakout) s507 (body harn, near right front window/ door lock control switch breakout) s601 (body harn, right side of dash) (digital) (analog) (main harn, near clock breakout) (main harn, near eatc control module breakout) s287 A/c-heater mode switch illumination B (+) C2026 C2027 C2029 C227 C228 C232 C249 C255 C256 c250 C262 Central junction box Circuit breaker 18a Clock Cluster/ prndl illumination Dash cigar lighter Dash cigar lighter lamp Digital cluster only Dim dn input Dim down Dim up Dim up input Dimming out Electronic automatic temperature control (eatc) module Front control unit (radio) Fuse 15a G200 G203 Grd Head Headlamp dimmer switch Headlite sw in Hot at all times Illumination Instrument cluster Led switch illum Left rear window control switch Lighting control module (lcm) (behind left side of dash) Main light switch Master window/ door lock control switch Message center switch assembly Off Park Park lt sw in Rear window defrost control Right front window/ door lock control switch Right rear window control switch S204 S207 S208 S227 S233 S262 S285 S288 S503 S600 W/ eatc W/o eatc
POWER DISTRIBUTION Power Distribution Wiring Diagram (1 of 4) for Mercury Grand Marquis LS 1999 List of elements for Power Distribution Wiring Diagram (1 of 4) for Mercury Grand Marquis LS 1999: 67 (dash harn, behind left side of dash) s283 (dash harness, in breakout to blend door actuator) s245 (engine compt harn, near breakout to fuse box) s100 (near breakout to clock) s213 (rear harn, near breakout to right rear speaker) Air suspension compressor motor/ vent solenoid Air suspension relay Air suspension/ evo steering module Base vehicle and police Battery Battery junction box C216 C251 C520 Cd changer Circuit breaker 7 20a Cooling fan high relay Customer use Data link connector Driver's door module Driver's lumbar switch Driver's seat control switch Except natural gas From a fuse 4 (diagram 1 of 4) Front control unit Fuel pump prime connector Fuel pump relay or fuel valve relay Fuse 15a Fuse 20a Fuse 25a Fuse 30a Fuse 50a Generator High current relay center Horn relay Instrument cluster (analog) Left rear air spring solenoid Master window/ door lock control switch Natural gas vehicle module Nca Passenger's lumbar switch Passenger's seat control switch Pcm power relay Police option Police option fuse holder Police power relay Powertrain control module Red Relay center Right front window/ door lock control switch Right rear air spring solenoid S114 (right side of engine compartment) S124 (engine harn, near breakout to fuel pump prime) S144 (engine compt harn, near breakout to fuse box) S155 S282 (dash harn, behind left side of dash) S406 (rear harn, near breakout to rear air spring solenoid) S411 Starter/ motor solenoid Subwoofer amplifier (lux radio) To fuse 14 (diagram 2 of 4) To fuse 8 (diagram 1 of 4) Trunk lid release switch Trunk lid release switch 2 W/ keyless entry W/ power lumbar W/o keyless entry Power Distribution Wiring Diagram (2 of 4) for Mercury Grand Marquis LS 1999 List of elements for Power Distribution Wiring Diagram (2 of 4) for Mercury Grand Marquis LS 1999: 58 (dash harness, near breakout to instrument cluster) s294 (dash harness, near breakout to lighting control module) s227 (dash harness, near breakout to lighting control module) s228 (engine compt harn, near breakout to primary crash sensor) s146 Anti-lock brake module Battery junction box C2029 C227 C249 C255 C262 Central junction box Circuit breaker 20a Circuit breaker 30a Clock Cooling fan low relay Dash cigar lighter Day/ night sensor amplifier Daytime running lamps module Digital cluster Electronic automatic temperature control module Emergency flasher relay 1 Emergency flasher relay 2 Evac and fill connector From circuit breaker 7 (diagram 1 of 4) Fuse 10a Fuse 15a Fuse 20a Fuse 40a Fuse 50a G203 (right kick panel, near door sill) Hidden antenna module Instrument cluster Keypad switch assembly Left spot light Lighting control module Lighting control module (lcm) Main light switch Master window/ door lock control switch Multi- function switch Nca Passive anti-theft system module Police option Power mirror switch Power point (2000) Rear window defrost control Rear window defrost relay Right front window/door lock control switch Right spot light S153 (near engine compartment fuse box) S206 S252 (main harn, near breakout to multi- function switch) S262 (dash harn, near breakout to lighting control module) S285 (dash harn, near breakout to main light switch) S426 (trunk harn, near breakout to relay center) To fuse 2 (diagram 3 of 4) W/police option W/remote keyless entry Power Distribution Wiring Diagram (3 of 4) for Mercury Grand Marquis LS 1999 List of elements for Power Distribution Wiring Diagram (3 of 4) for Mercury Grand Marquis LS 1999: 61 (analog) (dash harn, near breakout to day/night sensor amplifier) s226 (dash harn, near breakout to day/night/ sensor amplifier) s269 (dash harn, near breakout to ignition switch) s219 (dash harn, near breakout to ignition switch) s263 (digital) A/c wot cutout relay Acc Air suspension/ evo steering module Anti-lock brake module Battery junction box Blend door actuator Blower motor Brake pedal position switch C216 C251 C255 C256 C277 Central junction box Daytime running lamps module Digital transmission range sensor Electronic automatic temperature control module Electronic crash sensor Electronic day/night mirror Evac and fill connector Evo steering module From fuse 14 (diagram 2 of 4) Function selector switch assembly Fuse 10a Fuse 15a Fuse 30a Fuse 50a Generator Ignition switch Instrument cluster Lock Multi- function switch Nca Off Relay center Run S139 S231 (dash harn, near clock) S265 (near brake pedal position switch) S272 (dash harness, near breakout to ignition switch) S274 (dash harn, near breakout to evo steering module) Shift lock actuator Speed chime module Speed control deac switch Start Starting/ charging system Steering wheel rotation sensor To fuse 2, 6, 11 & circuit breaker 14 (diagram 4 of 4) To fuse 7 & 13 (diagram 4 of 4) Traction control switch W/ air suspension W/ drl W/ eatc W/o air suspension W/o eatc Power Distribution Wiring Diagram (4 of 4) for Mercury Grand Marquis LS 1999 List of elements for Power Distribution Wiring Diagram (4 of 4) for Mercury Grand Marquis LS 1999: 62 (body harn, near breakout to transmission range sensor) s218 (dash harn, near breakout to data link connector) s266 (dash harn, near breakout to ignition switch) s221 (dash harn, near breakout to trunk lid release switch) s211 (engine harn, near breakout to camshaft position sensor) s103 (front of right fender) s151 Battery junction box C2027 C229 C232 C249 C250 C251 C262 C298 C520 Central junction box Circuit breaker 20a Clock Digital cluster Driver's door module Except police From ignition switch (diagram 3 of 4) Front control unit Fuse 15a Fuse 25a Fuse 30a Fuse 5a Ignition coil 1 Ignition coil 2 Ignition coil 3 (gasoline) Ignition coil 3 (ngv) Ignition coil 4 (gasoline) Ignition coil 4 (ngv) Ignition coil 5 (gasoline) Ignition coil 5 (ngv) Ignition coil 6 (ngv) Ignition coil 7 Ignition coil 8 Ignition coil 8 (gasoline) Instrument cluster (analog) Lighting control module Luggage compt lid release switch 1 Main light switch Master window/ door lock control switch One touch window down module Passive anti- theft system control module Pcm power diode Police Police only Police power relay Radio noise capacitor Relay center S2009 S223 (left side of dash) Speed control servo assembly Transmission control switch W/ keyless entry W/o keyless entry Warning lamps module Windshield wiper motor Wiper control module
POWER DOOR LOCKS Door Lock Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Door Lock Wiring Diagram for Mercury Grand Marquis LS 1999: 23 (body harn, behind left kick panel) s260 (body harn, near breakout to bpp switch) s261 (body harn, near breakout to right rear door grommet) s291 Battery junction box (in right front of engine compt, behind battery) C2029 Circuit breaker 7 20a Door lock in G203 (behind right kick panel) Hot at all times Interior lights system Left front door lock motor Left rear door lock motor Lighting control module (behind left side of dash) Lock Master window/door lock control switch Right front door lock motor Right front window/door lock control switch Right rear door lock motor S208 S245 S503 S600 Unlock Keyless Entry Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Keyless Entry Wiring Diagram for Mercury Grand Marquis LS 1999: 65 (body harn, left side of dash) (body harn, near breakout to left exterior heated mirror) s506 1/2 3/4 5/6 7/8 9/0 Battery junction box (in right front of engine compt, behind battery) C2026 C2027 C2029 C518 C519 C520 Central junction box (below dash, left of steering column) Circuit breaker 7 20a Door ajar Door handle Door hndl sw Door lock Door unlock Driver's door module (left front door) Fuse 8 15a G203 (behind right kick panel) Hot at all times Interior lights system Keypad illum Keypad lamp Left front door lock motor Left rear door lock motor Lf door unlck Lighting control module (behind left side of dash) Lock Luggage compartment lid release solenoid/ ajar switch Luggage compartment lid release switch Master window/ door lock control switch Nca Panic Panic out Red Remote keyless entry switch assembly Right front door lock motor Right front window/door lock control switch Right rear door lock motor S208 S228 S235 S245 S260 (body harn, behind left kick panel) S261 (body harn, near breakout to park boo switch) S291 (body harn, near breakout to right rear door grommet) S304 S403 S500 S502 (door harn, center of left front door) S503 S510 (body harn, near breakout to left front door) S600 Seat Seat switch Start input Starting/charging system Trunk Trunk lid Unlock
POWER MIRRORS Electronic Day/Night Mirror Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Electronic Day/Night Mirror Wiring Diagram for Mercury Grand Marquis LS 1999: 17 (body harn, near breakout to brake pedal position switch) Central junction box (below dash, left of steering column) Digital transmission range (dtr) sensor (left side of transmission) Electronic day/night mirror Exterior lights system Fuse 15a G203 (behind right kick panel) Ground Hot in run Power Reverse S139 S208 S215 S226 S274 Sense Power Mirrors Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Power Mirrors Wiring Diagram for Mercury Grand Marquis LS 1999: 18 (1999 & 2000) (2001) Central junction box (below dash, left of steering column) Direc- tional control switch Down Exterior rear view mirror switch Fuse 15a G203 (behind right kick panel) Hot at all times L/r motor Left Left exterior rear view mirror Nca Red Right Right exterior rear view mirror S228 S500 Up/dn motor
POWER SEATS 6-Way, Recliner & Lumbar Power Seat Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for 6-Way, Recliner & Lumbar Power Seat Wiring Diagram for Mercury Grand Marquis LS 1999: 37 red Battery junction box (in right front of engine compt, behind battery) Driver lumbar air bladder Driver lumbar switch Driver power lumbar compressor (under front of left front seat) Driver power seat motor Driver recliner motor Driver seat control switch Entire seat Front height motor Front of seat Fuse 20a Fwd Fwd/ rwd motor G203 (behind right kick panel) Hot at all times Inflate Nca Nca Passenger lumbar air bladder Passenger lumbar switch Passenger power lumbar compressor (under right of right front seat) Passenger power seat motor Passenger recliner motor Passenger seat control switch Rear height motor Rear of seat Red Rwd S208 S245 S304 S500 S600 Seat back Up Vent Driver Power Seat Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Driver Power Seat Wiring Diagram for Mercury Grand Marquis LS 1999: 18 Battery junction box (in right front of engine compt, behind battery) Driver power seat motor Driver seat control switch Entire seat Front height motor Front of seat Fuse 20a Fwd Fwd/ rwd motor G203 (behind right kick panel) Hot at all times Nca Rear height motor Rear of seat Red Rwd S245 S304
POWER WINDOWS Power Window Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Power Window Wiring Diagram for Mercury Grand Marquis LS 1999: 48 (2 led's per switch) (near break- out to brake pedal pos switch) s264 (near breakout to air suspension/evo strng module) s288 C298 C518 C520 Central junction box (below dash, left of steering column) Circuit breaker 20a Door lock control switch Driver door module (w/ keyless entry) (center of left Driver door) Entry Front driver door) G203 (behind right kick panel) Hot in acc or run Ign Interior lights system Keyless Left Left front Left front window motor Left front window motor (police only) Left rear Left rear window motor Master window/ door lock control switch Nca One touch window down module (w/o keyless entry) (center of Others Police Rear window control switch Right Right front Right front window motor Right rear Right rear window motor S208 S218 S500 S503 S504 (near breakout to left front door speaker) S600 Solid state W/ keyless entry W/o W/o keyless entry Window lock switch Wndw dn Wndw up
RADIO Radio Wiring Diagrams, with Amplifier for Mercury Grand Marquis LS 1999 List of elements for Radio Wiring Diagrams, with Amplifier for Mercury Grand Marquis LS 1999: 68 (behind right kick panel) g203 (center rear of luggage compartment) Acc Antenna Audio (+) Audio (-) Audio mute Audio network Audio shield Audio system on Battery junction box (right front of engine compt, behind battery) C224 C230 C232 C401 C499 Cd changer Cd left sig in Cd left sig out Cd right sig in Cd right sig out Central junction box (below dash, left of steering column) Front control unit Fuse 20a Fuse 25a Fuse 5a Fused ignition G203 (behind right kick panel) G407 G407 (center rear of luggage compartment) Ground Hot at all times Hot in run or acc Ignition switch Illum power Interior lights L front spkr (+) L front spkr (-) L rear spkr (+) L rear spkr (-) Left front speaker Left rear speaker Lock Nca Off Power R front spkr (+) R front spkr (-) R rear spkr (+) R rear spkr (-) Right front speaker Right rear speaker Run S127 S204 S213 S267 (main harn, near breakout to ignition switch) S446 Sta Start Start feed Starting system, door locks system Sub speaker Subwoofer (+) Subwoofer (-) Subwoofer amplifier Subwoofer mute Tan Radio Wiring Diagrams, without Amplifier for Mercury Grand Marquis LS 1999 List of elements for Radio Wiring Diagrams, without Amplifier for Mercury Grand Marquis LS 1999: 31 (behind right kick panel) g203 Antenna Battery junction box (right front of engine compt, behind battery) C232 Central junction box (below dash, left of steering column) Front control unit Fuse 25a Fuse 5a Fused ignition G203 (behind right kick panel) Ground Hot at all times Hot in run or acc Illum power Interior lights system L front spkr (+) L front spkr (-) L rear spkr (+) L rear spkr (-) Left front speaker Left rear speaker Nca Power R front spkr (+) R front spkr (-) R rear spkr (+) R rear spkr (-) Right front speaker Right rear speaker S204 S213
SHIFT INTERLOCKS Shift Interlock Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Shift Interlock Wiring Diagram for Mercury Grand Marquis LS 1999: 15 (near breakout to multi-function switch) s243 Brake pedal position (bpp) switch (top of brake pedal support) Central junction box (below dash, left of steering column) Exterior lights system Fuse 1 15a Fuse 5 15a G200 (behind left kick panel) Hot at all times Hot in run S203 (or s207) S226 S258 (near breakout to brake pedal position (bpp) switch) S265 Shift lock actuator (at bottom of steering column) Solid state
STARTING/CHARGING Charging Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Charging Wiring Diagram for Mercury Grand Marquis LS 1999: 24 (99-00) (2001) (not used) Battery Battery junction box (right front of engine compt, behind battery) C251 C251 c256 C256 Central junction box (below dash, left of steering column) Charge indicator Fuse 10a Fuse 30a Fuse link (12 ga- gray) (at battery junction box) G101 (front of right front fender apron) G111 (near battery) Generator Hot in run Instrument cluster Red S106 S114 S231 Starter motor/ solenoid W/ analog cluster W/ digital cluster Starting Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Starting Wiring Diagram for Mercury Grand Marquis LS 1999: 27 87a Acc Battery Battery junction box (right front of engine compt, behind battery) Charging circuit Digital transmission range (dtr) sensor (left side of transmission) Door locks (driver's door module) Fuse 30a Fuse link (12 ga- gray) (at battery junction box) G101 (front of right front fender apron) G111 (near battery) High current relay center (right rear of engine compt) Hold Ignition switch Lock Off Pull in Red Run S113 S114 S127 S267 (main harn, near breakout to ignition switch) Sta Start Starter motor relay Starter motor/ solenoid
SUPPLEMENTAL RESTRAINTS Supplemental Restraint Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Supplemental Restraint Wiring Diagram for Mercury Grand Marquis LS 1999: 49 (analog) (analog) (digital) (behind left side of dash) (digital) (main harn, near breakout to instrument cluster) s284 Air bag electronic crash sensor (behind right side of dash, above glove box) Air bag ind Air bag indicator Air bag sliding contact Analog cluster only C124 C2021 C2026 C250 C251 C255 C256 Central junction box (below dash, left of steering column) Computer data lines system Connector (dlc) Crash sensor Data link Data link (dlc) Digital cluster only Driver air bag Front crash sensor (on left front side of upper radiator support) Fuse 10a Fuse 15a G203 (behind right kick panel) Gas Ground Hot at all times Hot in run Hot in run or start Instrument cluster Lighting control module (lcm) (behind left side of dash) Natural gas vehicle module (front of radiator support) Nca Ngv Passenger air bag Pin shorting bar is engaged when module connector is disconnected (shorting bar is connected between the following pins: 1-15, 7-21, 14-28) Power (bat) Power (run) S269 S271 (dash harn, near breakout to data link connector) S276 S299 (main harn, near breakout to instrument cluster) Shorting bar Warning chime
TRANSMISSION A/T Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for A/T Wiring Diagram for Mercury Grand Marquis LS 1999: 114 (12a581 harn, left rear of engine compt) (12a581 harn, left rear of engine compt) s129 (12a581 harn, near breakout to fuel pump prime) (12b636 harn, near breakout to generator) (12b637 harn, near fuel inj 8) (14401 harn, near breakout to data link connector) (7c078 harn, left rear of engine compartment) (behind air cleaner assembly) mass air- flow (maf) sensor (left rear of trans) vehicle speed sensor (left side of trans- mission) output shaft speed (oss) sensor (left side of transmission) digital transmission range sensor (rear of left front fender apron) (rear of left front fender g104 apron) 4r70w transmission A/c cutout Abs module, Analog Anti-theft system, Anti-theft systems Battery junction box (right front of engine compartment) Bpp switch input Brake pedal position (bpp) switch (top of brake pedal support) C250 C255 Central junction box (below dash, left of steering column) Cht sens Control module, instrument cluster Cylinder head Data link + Data link - Data link connector (partial) (behind left side of dash) Data link power Datalink connector Digital Eatc module Elect press cntrl Electronic pressure control solenoid Engine controls system Exterior lights Fuse 15a Fuse 25a Fuse 30a G104 G104 (rear of left front fender apron) G203 (behind Ground Hot at all times Hot in run or start Ignition coils, radio noise capacitor Ignition power Instrument cluster Instrument cluster, cruise control, electronic suspension Intake air Intake air temp Kapwr Maf return Maf sensor sig Multi- function switch Ngv module Output shaft sig Pcm power diode Pcm power relay Powertrain control module (pcm) (left side of firewall) R p Red Red red Ref votage Relay center (left side of engine compartment) Right kick panel) S100 S105 S115 S119 S123 S125 S126 S132 S134 S135 S147 S148 S223 S263 S265 S276 S296 S297 Shift sol 1 Shift solenoid 2 Shift solenoids Signal control Speed control deac switch Ss1 Ss2 Tci lamp Temperature (cht) sensor (top left front of engine) Temperature (iat) sensor (left front of engine) compt) Throttle position (tp) sensor (left side of throtle body) To a/c system Torque conv sol Torque converter clutch (tcc) solenoid Tps signal Tr1 Tr2 Tr3 Tr4 Trans cntrl sw Trans control indicator lamp Trans temp Transmission control switch (tcs) (bottom of steering column) Transmission fluid temperature sensor Vss (-) Vss signal Warning lamps module, lighting
TRUNK, TAILGATE, FUEL DOOR Trunk Release Wiring Diagram, with Keyless Entry for Mercury Grand Marquis LS 1999 List of elements for Trunk Release Wiring Diagram, with Keyless Entry for Mercury Grand Marquis LS 1999: 23 Battery junction box C2027 C254 C519 C520 Circuit breaker 20a Decklid ajar switch Digital cluster only Driver's door module (in center of left front door) G203 (behind right kick panel) Hot at all times Instrument cluster (digital) Lighting control module (lcm) (behind left side of dash) Release out Release sw S245 S273 (main harn, near breakout to 16 pin in-line conn, behind left kick panel) S403 S500 S506 (body harn, near breakout to left power heated mirror) Trunk ajar input Trunk lid release solenoid/ajar switch (center rear of trunk lid, part of latch assembly) Trunk lid release switch Trunk Release Wiring Diagram, without Keyless Entry for Mercury Grand Marquis LS 1999 List of elements for Trunk Release Wiring Diagram, without Keyless Entry for Mercury Grand Marquis LS 1999: 23 (police only) Battery junction box C2027 C254 C298 Central junction box Circuit breaker 20a Decklid ajar switch Digital cluster only G203 (behind right kick panel) Hot at all times Hot in acc or run Instrument cluster (digital) Lighting control module (lcm) (behind left side of dash) Police only S205 (main harn, near breakout to in-line conn, behind center right of dash) S211 S245 S273 (main harn, near breakout to 16 pin in-line conn, behind left kick panel) S403 Trunk ajar input Trunk lid release solenoid/ajar switch (center rear of trunk lid, part of latch assembly) Trunk lid release switch
WARNING SYSTEMS Warning System Wiring Diagrams for Mercury Grand Marquis LS 1999 List of elements for Warning System Wiring Diagrams for Mercury Grand Marquis LS 1999: 90 (behind right kick panel) g203 (police only) Ajar lamp output Analog Autolamp delay Autolamp enable Autolamp on/off B+ to module C2026 C2027 C2029 C255 C262 Central junction box (below dash, left of steering column) Circuit breaker 18a Computer data lines system Courtesy lps out Decklid ajar Def relay output Defogger system Demand lt out Digital Digital cluster Dimming out Dimming output Dlc Dome lamp sw Door handle sw Door locks input Door locks system Driver's ajar sw Electronic crash sensor (behind right side of dash) Exterior lights system Fasten belts input c251 c256 Flasher output Flasher pwr in Fuse 15a G200 (behind left kick panel) G203 (behind right kick panel) Ground Hazard ind Head Headlamp sw Headlamp switch assembly Headlights system Heated backlt sw Horn relay output Horns system Hot at all times Hot in run or accy Hot in run or start Ignition Instrument cluster Instrument cluster system Interior lights system Key in Key warning switch Left front door latch switch Left rear door latch switch Lighting control module (lcm) (behind left side of dash) Low beams out Nca Off Panel dim down Panel dim up Panic alarm Park Parklamp output Parklamp sw Pass. ajar sw Right front door latch switch Right rear door latch switch S2009 S207 S208 S227 S259 (body harn, near right "a" pillar) S262 S276 S284 S285 S304 S500 S600 Seat belt switch Seatbelt ind Seatbelt sw Sound tone output Tone req Trunk, tailgate, fuel doors system
WIPER/WASHER Wiper/Washer Wiring Diagram for Mercury Grand Marquis LS 1999 List of elements for Wiper/Washer Wiring Diagram for Mercury Grand Marquis LS 1999: 26 (behind left kick panel) g200 100k ohms 3.3k ohms 4.08k 7.25k Central junction box (below dash, left of steering column) Fuse 30a G101 (front of right fender) Hot in acc or run Int max Int min Multi- function switch Off Off 36.27k ohms Ohms Parked Parking Red Run S112 S207 S266 Wash Windshield washer pump (in fluid reservoir) Windshield wiper motor (top center of firewall) Wiper control module (behind center of of dash, above warning lamp module)
