1992 BMW 325 Series Wiring Diagrams

Fig. 1: Engine Compartment, Alternator, Headlights (Grid 1-3)

This section details the wiring for the engine compartment, including the alternator and headlights. A component locator table is provided, listing various components such as the ABS control unit, airbag system, alternator, blower relay, brake fluid level switch, central locking module, cigarette lighter, clutch switch, combination switch, compressor control relay, coolant level switch, crash control unit, cruise control actuator and module, diagnostic connectors, dimmer, door switches, driver's seat belt switch, dual pressure switch, EGS control unit, fog light relay and switch, fuel pump relay, gear select switch, glove box light and switch, grounds (A-N), hazard flasher relay and switch, heated seats, high beam relay, high speed relay, hood switch, horn relay, ignition switch, inertia switch, instrument cluster, integrated climate regulation control unit, interior lights, light switch, low beam relay, main relay, Motronic Control Unit (MCU), normal speed relay, OBC horn relay, OBC temperature sensor, on-board computer (OBC), power distribution box (PDB), power mirrors, power seats, power windows, program switch, radio micro switch, rear defog relay, rear defogger/antenna, right rear brake pad sensor, starter, stop light switch, sunroof control unit, temperature switch, and washer fluid level switch.

Key connections and components illustrated include the battery, starter, alternator, various relays (e.g., blower relay, compressor control relay, fog light relay, fuel pump relay, hazard flasher relay, high beam relay, high speed relay, horn relay, low beam relay, main relay, normal speed relay, OBC horn relay, rear defog relay), switches (e.g., brake fluid level switch, clutch switch, coolant level switch, cruise control switch, dimmers, door switches, driver's seat belt switch, dual pressure switch, fog light switch, gear select switch, glove box light switch, hood switch, hazard switch, ignition switch, light switch, radio micro switch, stop light switch, temperature switch, washer fluid level switch), control units (e.g., ABS control unit, airbag system, EGS control unit, integrated climate regulation control unit, Motronic Control Unit, OBC, sunroof control unit), and various lights (e.g., auxiliary DRL, left headlight, right headlight, interior lights, glove box light, underhood light).

Fig. 2: Motronic Control Unit (2.5L) (Grid 4-7)

This diagram focuses on the Motronic Control Unit (2.5L) and its associated wiring. It shows connections for fuel pump relay control, idle speed control, injectors, ignition coils, power input, main relay control, ground connections, check engine light control, instrument cluster, EGS control unit, TPS (Throttle Position Sensor), camshaft sensor, fuel rate output, on-board computer, battery, junction block, EVAP purge valve control, O2 sensor heater control, airflow input, coolant temperature input, air inlet temperature, starter input, reference output, program voltage, and crankshaft sensor.

Key components and circuits depicted include the Motronic Control Unit, EGS Control Unit, fuel injectors, ignition coils, O2 sensor/heater, fuel pump relay, main relay, O2 sensor heater relay, idle speed actuator, throttle potentiometer, air inlet temperature sensor, coolant temperature sensor, air mass meter, and various ground points.

Fig. 3: Power Distribution Box (PDB) (Partial) (Grid 8-11)

This section illustrates a partial view of the Power Distribution Box (PDB), detailing fuse and relay assignments. It includes connections for OBC horn relay, high beam relay, fog light relay, low beam relay, comfort relay, sunroof control unit, unloader relays, right seat control switch, rear defog relay, central locking modules, horn relay, radio, ABS relays, stop light switch, instrument cluster, cruise control actuator switch, cruise control module, fuse links, blower relay, ignition switch, washer pump, glove box light, twin relay modules, wiper/washer module, dome light/map reading lights, driver's seat control switch, wiper relay, compressor control relays, ABS pump motor relay, light switch, check control module, OBC, front cigarette lighter, chime module, and integrated climate regulation control unit.

The diagram shows the layout of fuses (F1-F46) and their corresponding amperage ratings, as well as various relays and their connections to the PDB.

Fig. 4: Power Distribution Box (PDB) (Partial) (Grid 12-15)

This is another partial view of the Power Distribution Box (PDB), showing fuse assignments and connections. It details fuses F11-F30 and their amperage ratings, along with connections to the fuel pump relay, DME relay, oxygen sensor relay, horn relay, fog light relay, high beam relay, low beam relay, hazard flasher relay, blower relay, ABS relay, ABS pump motor relay, rear defog relay, high speed relay, normal speed relay, and compressor relay. It also shows connections for the blower switch, light switch, program switch, combination switch, and integrated climate regulation control unit.

Specific circuits shown include the fuel pump, DME, oxygen sensor, horn, fog lights, high beam, low beam, hazard flashers, blower, ABS system, rear defogger, high speed functions, compressor, and various control modules and switches.

Fig. 5: Ignition Sw, Cruise Control, Airbag (Grid 16-19)

This diagram covers the wiring related to the ignition switch, cruise control system, and airbag system. It includes connections for fuses F16, F24, F28, and F33, blower relays, instrument cluster, MCU pin #56, ground B, ignition ground, cruise control actuator, ignition switch, cruise control switch, starter (M/T and A/T), stop light switch, deceleration/acceleration switches, slip ring, airbag generator, EGS control unit, glove box light and switch, clutch switch, charging plug, anti-theft horn, ground E, hazard switch, gear select indicator light, radio, OBC, cassette box light, rear ashtray light, front ashtray light, front cigarette lighter light, program switch, crash control unit, ground F, wiper/washer module, OBC temperature sensor, central locking module, ground G, check control module, left rear door contact, right rear door contact, and various other ground points.

Key components illustrated are the ignition switch, cruise control system components (actuator, switch, module), airbag system components (generator, diagnostic module), EGS control unit, and various switches and lights.

Fig. 6: EGS Control Unit, ABS Control Unit (Grid 20-23)

This wiring diagram illustrates the EGS Control Unit and the ABS Control Unit. It shows connections for MCU pins, auto/manual modes, OBC, fuses F26 and F28, program switch, ground E, starter, back-up lights, cruise control module, gear select switch, ABS control unit, ABS hydraulic unit, ABS pump motor relay, and various ground points (J, K).

Circuits covered include the EGS control unit, ABS control unit, starter, back-up lights, cruise control, gear selection, ABS hydraulic unit, ABS pump motor, and various sensors like speed sensors, O2 sensor, and coolant temperature sensor.

Fig. 7: Integrated Climate Regulation Control Unit (Grid 24-27)

This diagram details the Integrated Climate Regulation Control Unit. It shows connections for ground B, starter, pressure switch, alternator, fuses F23 and F39, auxiliary fan motor, dual pressure switch, compressor clutch, compressor control relay, EGS control unit, MCU pins, temperature switch, water valve assembly, vent switch, and various ground points.

Key components include the Integrated Climate Regulation Control Unit, EGS control unit, MCU, various switches (pressure switch, dual pressure switch, vent switch, temperature switch, A/C switch, circulation switch, defog switch), relays (auxiliary fan motor, compressor control relay, rear defog relay, blower relay), motors (mixing flap, fresh air flap, footwell flap, blower motor), and sensors (evaporator temp sensor, outside temp sensor, left heat temp sensor, right heat temp sensor).

Fig. 8: Combination Sw, Hazard Flasher, Light Sw, Dimmer (Grid 28-31)

This diagram illustrates the wiring for the combination switch, hazard flasher, light switch, and dimmer. It includes connections for fuses F33, F37, F25, F22, F29, F11, F23, F43, and F34. It shows connections to the integrated climate regulation control unit, check control module, OBC, hazard flasher relay, high beam relay, low beam relay, fog light switch, fog light relays, and various lights such as park lights, left park light, right park light, interior lights, underhood light, cassette box light, reading lights, and license plate lights.

Components covered include the combination switch, hazard flasher system, light switch, dimmer control, and various interior and exterior lighting circuits.

Fig. 9: Instrument Cluster, OBC, Check Control Module (Grid 32-35)

This diagram covers the instrument cluster, On-Board Computer (OBC), and Check Control Module. It shows connections for various switches including combination switch, dimmer, hazard flasher relay, hazard switch, park brake switch, brake fluid level switch, tachometer, fuel consumption gauge, airbag diagnostic module, ignition switch, left front brake pad sensor, right rear brake pad sensor, fuel gauge, speedometer, seat belt switch, cruise control module, radio, fog lights, hood switch, radio micro switch, ABS control unit, oil pressure switch, brake fluid level switch, central locking module, airbag illumination, OBC, fuel tank sensors, vehicle speed sensor, stop light switch, and various ground points.

Key systems included are the instrument cluster, OBC, Check Control Module, ABS system, EGS control unit, and central locking system.

Fig. 10: Power Windows, Central Lock Module (Early Model Production), Power Doors (Grid 36-39)

This diagram illustrates the wiring for power windows, the central lock module (early model production), and power doors. It shows connections for limit switches for left rear, right rear, left front, and right front windows, as well as window switches and motors for the same. It also includes connections for the child protection control switch, comfort relay, fuses F1 and F7, power distribution box (PDB), ground points (L, M, I, G, O, N, I), interior lights, door contact switches (right rear, left rear, passengers front, drivers front), door handle switches (left front), central locking module, crash control unit, gas filler lock motor, trunk lock motor, left front door lock motor, right front door lock motor, left rear door lock motor, and right rear door lock motor.

The diagram details the operation of power windows, central locking, and power door mechanisms.

Fig. 11: Power Mirrors, Driver Seat Control, Heated Seat (Grid 40-43)

This diagram covers the wiring for power mirrors, driver seat control, and heated seats. It shows connections for ground points, left and right mirror motors, seat heater components (seatback heater, seat cushion tilt motor, seat position motor), driver's seat control switch, driver's seat heater switch, passenger's seat heater switch, dimmer, unloader relay, mirror control switch, wiper relay, wiper motor relay, seat motor connectors, seat heater connectors, and various fuses (F4, F24, F45, F44, F5, F36, F40).

Key systems included are power mirrors, driver's seat controls (recline, height, tilt, position), and heated seat functions.

Fig. 12: Sunroof Control Unit, Antenna, Taillights (Grid 44-47)

This diagram illustrates the wiring for the sunroof control unit, antenna, and taillights. It shows connections for the antenna amplifier, radio, check control module, rear defog relay, integrated climate regulation control unit, hazard flasher relay, sunroof switch, micro switch, sunroof motor, sunroof control unit, high level stop light, passenger's seat heater, passenger's door jamb switch, passenger's seat control switch connector, license lights, back-up light switch, driver's seat heater, driver's seatback heater, driver's seat control switch, driver's seat belt switch, driver's door switch, right rear brake pad sensor, fuel pump, and various ground points.

Circuits covered include the sunroof operation, antenna system, and taillight assemblies.

Fig. 13: Central Lock Module (Late Model Production)

This diagram details the Central Lock Module for late model production. It shows connections for data link connectors, fuses F1 and F35, power windows system, inertia switch, crash signal, passenger's and driver's door open voltage supply, passenger's and driver's door lock motor voltage supply, trunk lock motor, anti-theft module (Alpine), interior lights system, parking light detection, and various ground points.

It illustrates the operation of the central locking system, including door lock motors, trunk lock motor, and their integration with other systems like power windows and the anti-theft system.

Models: BMW 325, 1992 Electrical Wiring Diagrams, Wiring Diagrams, 1992 Electrical, BMW 325 Wiring Diagrams

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