Diagram sections — 12 (19 total)
COOLING FAN DEFOGGERS HORN MEMORY SYSTEMS POWER DOOR LOCKS POWER MIRRORS POWER SEATS POWER WINDOWS RADIO STARTING/CHARGING TRUNK, TAILGATE, FUEL DOOR WIPER/WASHER
COOLING FAN Cooling Fan Wiring Diagram for Porsche 928 S4 1990 List of elements for Cooling Fan Wiring Diagram for Porsche 928 S4 1990: 25 (1987-1989) (1990-1992) Air conditioning system Anti-theft system Central electric (in passenger's footwell on safety wall) Coolant fan & flap unit (on passenger's side sill) Coolant fan amplifier (in engine compartment on front right end panel) Cooling fan 1 Cooling fan 2 Cooling water thermoswitch (right rear of engine compartment, on expansion tank) Freon pressure switch (in cooling hose, before expansion tank) Fuse 28 fuse 29 30a Fuse 29 fuse 30 30a Fuse 3 fuse 36 5a G109 (in engine compartment, near air conditioning condenser) Hot at all times Hot in acc or run Intake pipe temperature switch N23 d22 Q14 c15 Q21 b22 Q22 b23 Q25 d24 Red S25 s22 Torque converter oil temperature switch
DEFOGGERS Defogger Wiring Diagram for Porsche 928 S4 1990 List of elements for Defogger Wiring Diagram for Porsche 928 S4 1990: 42 (not used) (right side of safety wall above central electric) g201 (right side of safety- wall, above central electric) g201 85a 86a 86b 87a Acc C12 Central electric) g201 Central electric (in passenger's footwell on safety wall) Driver's side mirror F15 F21 F22 Fresh air blower relay (1990 only) Fuse 25a G204 (lower left side of steering console) G407 (center of luggage compartment, under spare cover) Hazard light switch Hot at all times Ignition switch Intensive cleaning switch Interior lights system Nca Off Passenger's side mirror Q13 Q15 Q24 Rear window defogger Rear window defogger relay Rear window defogger switch Red Run S21 S23 Start Starter Vs terminal W/memory mirrors W/o memory mirrors
HORN Horn Wiring Diagram for Porsche 928 S4 1990 List of elements for Horn Wiring Diagram for Porsche 928 S4 1990: 12 (in engine compartment near air conditioning condenser) g101 Central electric (in passenger's footwell on safety wall) Contact unit D13 Fuse 24 7.5a Hot at all times N15 Sliding contact unit Steering wheel (w/horn contact) Two- tone horns relay Two-tone horn Wipe/ wash switch (w/horn contact)
MEMORY SYSTEMS Driver's Memory Seat Wiring Diagram (1 of 2) for Porsche 928 S4 1990 List of elements for Driver's Memory Seat Wiring Diagram (1 of 2) for Porsche 928 S4 1990: 17 (1987) (1988-1989) (1990) (1987-1989) (1990) (1987-1989) h21 p13 (1990) (1988-1989) (1990) 4-way seat switch 2 4-way seat switch 3 Central electric (behind panel, in passenger's footwell) Driver's seat memory control unit (in driver's seat) Fuse 21 fuse 20 fuse 22 30a Fuse 7 20a (1987) Fuse 8 fuse 44 15a G103 (right of engine compartment) G11 k25 Hot at all times Hot in run or start Left memory switch Red Driver's Memory Seat Wiring Diagram (2 of 2) for Porsche 928 S4 1990 List of elements for Driver's Memory Seat Wiring Diagram (2 of 2) for Porsche 928 S4 1990: 17 1989-1990 1987-1988 4-way seat switch 1 Backrest heating element Backrest motor (under driver seat) G207 (steering console) Height front control motor (under driver seat) Height rear control motor (under driver seat) Longitudinal control motor (under driver seat) Lumbar curve control motor (under driver seat) Lumbar support height motor (under driver seat) Mirror memory control unit (in driver's footwell on side) Red Relay unit 1 Relay unit 2 Seat cushion heating element Seat heater switch Side heating element Memory Mirrors Wiring Diagram for Porsche 928 S4 1990 List of elements for Memory Mirrors Wiring Diagram for Porsche 928 S4 1990: 18 (not used) 1987-1989 Central electric (in passenger's footwell on safety wall) Defogger system Driver's side mirror E12 F12 F22 Fuse 24 fuse 25 7.5a G123 (right side of safety wall) Hot at all times Left memory switch Memory systems (seats) Mirror changeover switch Mirror control switch Mirror memory control unit (in driver's footwell on side) Passenger's side mirror Red Passenger's Memory Seat Wiring Diagram (1 of 2) for Porsche 928 S4 1990 List of elements for Passenger's Memory Seat Wiring Diagram (1 of 2) for Porsche 928 S4 1990: 17 (1987) (1988-1989) (1990) (1987-1989) (1990) (1987-1989) h21 p13 (1990) (1988-1989) (1990) 4-way seat switch 2 4-way seat switch 3 Button panel Central electric (behind panel, in passenger's footwell) Fuse 20 fuse 21 fuse 23 30a Fuse 7 20a (1987) Fuse 8 fuse 44 15a G12 m12 Hot at all times Hot in run or start Passenger's seat memory control unit (in passenger's seat) Red Right memory switch Passenger's Memory Seat Wiring Diagram (2 of 2) for Porsche 928 S4 1990 List of elements for Passenger's Memory Seat Wiring Diagram (2 of 2) for Porsche 928 S4 1990: 17 1987-1988 1989-1990 4-way seat switch 1 Backrest heating element Backrest motor (under passenger seat) G123 (right of safety wall) Height front control motor (under passenger seat) Height rear control motor (under passenger seat) Longitudinal control motor (under passenger seat) Lumbar curve control motor (under passenger seat) Lumbar support height motor (under passenger seat) Red Relay unit 1 Relay unit 2 Seat cushion heating element Seat heater switch Side heating element
POWER DOOR LOCKS Power Door Lock Wiring Diagram for Porsche 928 S4 1990 List of elements for Power Door Lock Wiring Diagram for Porsche 928 S4 1990: 20 (1989) (1990) Anti-theft system B13 q13 Central electric (in passenger's footwell on safety wall) Central lock button Central locks control unit Close Driver door lock motor F12 k14 Fuse 15a (1990) Fuse 5a (1989) G123 (above central electric) Hot at all times Instrument cluster system Interior lights system Left lock cylinder Nca Open Passenger door lock motor Right lock cylinder
POWER MIRRORS Power Mirror Wiring Diagram for Porsche 928 S4 1990 List of elements for Power Mirror Wiring Diagram for Porsche 928 S4 1990: 16 (1990) Central electric (in passenger's footwell on safety wall) Change- over switch Defogger system Driver's side mirror E22 F14 p14 Fuse 12 7.5a G201 (behind right side of i/p, above central electric) G204 (lower left side of i/p, on steering column) Hot in acc, run or start Mirror switch Passenger's side mirror Rear window defogger relay T12 Vs term
POWER SEATS Comfort Seats Wiring Diagram for Porsche 928 S4 1990 List of elements for Comfort Seats Wiring Diagram for Porsche 928 S4 1990: 31 (1989) (1989) (1989) (1990) (1989) h21 p13 (1990) (1990) (1990) (right seat) (left seat) 4-way seat switch 1 4-way seat switch 2 4-way seat switch 3 Backrest heating element Central electric (behind panel, in passenger's footwell) Comfort seat Front seat cushion height control Fuse 21 fuse 20 30a Fuse 23 fuse 22 30a Fuse 8 fuse 44 15a G11 k25 G12 m12 G123 (right side of safety wall) Hot at all times Hot in run or start Lumbar curve control Lumbar height control Rear seat cushion height control Red Seat back forward control Seat backrest control Seat cushion heating element Seat heater switch Side heating element Solid state Time delay relay Sport Seats Wiring Diagram for Porsche 928 S4 1990 List of elements for Sport Seats Wiring Diagram for Porsche 928 S4 1990: 25 (1989)(right seat) (1989)(left seat) (right seat)(1990) (left seat)(1990) 2-way seat switch 1 2-way seat switch 2 Backrest heating element Central electric (behind panel, in passenger's footwell) Front seat cushion height control Fuse 21 fuse 20 30a Fuse 23 fuse 22 30a Fuse 44 15a (1990) Fuse 8 15a (1989) G11 G116 (left side of safety wall) G12 m12 k25 H21 Hot at all times Hot run or start Rear seat cushion height control Red Seat cushion heating element Seat heater switch Side heating element Solid state Sport seat Time delay relay
POWER WINDOWS Power Window Wiring Diagram for Porsche 928 S4 1990 List of elements for Power Window Wiring Diagram for Porsche 928 S4 1990: 21 Alarm system additional control unit (in center console below radio) Central electric (in passenger's footwell on safety wall) Door locks system Driver power window push button switch Driver's side power window regulator motor Fuse 30a G201 (right side of i/p, above central electric) Hot at all times Hot in run or start Inside lights relay K24 L12 Left door contact Passenger power window push button switch Passenger's side power window regulator motor Power tops system (sun roof) Power window regulator/ sun roof control unit Q13 Red Right door contact Timing relay (in center console below radio)
RADIO Radio Wiring Diagrams for Porsche 928 S4 1990 List of elements for Radio Wiring Diagrams for Porsche 928 S4 1990: 28 1989-90 1990 and after Antenna Antenna amplifier (right side footwell) Anti-theft system Booster (under the cover, on passenger's side sill) Central electric (below right side of i/p) Deep range speaker E24 F24 Front left speaker assembly Front right speaker assembly Fuse 15a G123 (right side of safety wall) High range speaker Hot at all times Hot in accy, run or start Left Left door separating filter Middle range speaker Nca Radio Rear left speaker assembly Rear right speaker assembly Red Right Right door separating filter Suppressor (in center console)
STARTING/CHARGING Charging Wiring Diagram for Porsche 928 S4 1990 List of elements for Charging Wiring Diagram for Porsche 928 S4 1990: 14 Alternator Anti-lock brake system Anti-theft system Battery Central electric (behind panel in passenger's footwell) E21 G11 G404 (under tool kit cover) Instrument cluster Nca Power distribution system Red Starter Tire pressure control unit Starting Wiring Diagram for Porsche 928 S4 1990 List of elements for Starting Wiring Diagram for Porsche 928 S4 1990: 26 (1986-89) (1986-89) (1990-92) (1990-92) 15a A23 Acc Alternator Battery C12 Central electric (behind panel panel in passenger's footwell) G404 (under tool kit cover) G408 (under spare wheel cover) H21 Hot at all times Ignition switch Inhibitor switch Nca Off Power distribution system Q13 Red Relay 14 relay 5 starter Start Starter U23 Wire connector
TRUNK, TAILGATE, FUEL DOOR Trunk, Tailgate, Fuel Door Wiring Diagrams for Porsche 928 S4 1990 List of elements for Trunk, Tailgate, Fuel Door Wiring Diagrams for Porsche 928 S4 1990: 23 (1985-86 & 1990) (1985-86) (1990-92) (1991-92) (under spare wheel cover) (1985-86 & 1990) g404 Central electric (in passengers footwell on firewall) E13 F13 Fuse 24 5a (1985-86) Fuse 25 7.5a (1990-92) Fuse 26 1a Hot at all times Interior lights system J22 Left tailgate unlocking switch O11 R11 Red Right tailgate unlocking switch S11 T14 Tailgate door switch Tailgate unlocking drive
WIPER/WASHER Front Wiper/Washer & Headlight Washer Wiring Diagram for Porsche 928 S4 1990 List of elements for Front Wiper/Washer & Headlight Washer Wiring Diagram for Porsche 928 S4 1990: 53 (above central electric) g202 (lower left side of steering console) g204 31a 53b 53m 53s 53a 53b 53c 53e 53i Additional cleaning fluid pump Additional cleaning fluid pump relay C11 C24 Central electric (in passenger's footwell on safety wall) Fuse 25a Fuse 5a H15 Headlight cleaners relay Headlight washing fluid pump Headlights system Hot at all times Hot in acc or run Hot in run or start Iii Intensive cleaning switch Inter- mittent wiper control relay Interior lights system Interval wiping J13 J14 J15 J24 J25 K15 L22 L24 Left heated spray jet Nca O23 Off P23 Potentiometer Rear window wiper switch Red Right heated spray jet Solid state Tip sw Washing Windshield washing fluid pump Windshield wiper motor Wipe/wash switch Rear Wiper Wiring Diagram for Porsche 928 S4 1990 List of elements for Rear Wiper Wiring Diagram for Porsche 928 S4 1990: 16 53a Central electric (in passenger's footwell on safety wall) Fuse 15a Fuse 5a Fuse 7.5a G407 (under spare wheel cover) Hot at all times Hot in run or start Intensive cleaning switch Rear window wiper motor Rear window wiper relay Rear window wiper switch Red Solid state T15 U23
