BMW Fxx Series Seat Wiring Harness Diagram + Pin Layout

If you're swapping seats round or retrofitting, then you will want to keep electric movement functions and may even want to retain the heated-seat feature or even safety restraints. Here's a guide to wire colours and the pin-outs on the multi-block plug. 

Pin:

5+6 - CAN data wires to CAS [ Green + Orange/Green]

7 - 12v Power Wire [Red, Red/Blue or Red/Brown, 3mm thickness] 

8 - Main Ground Wire [Brown, 3mm thickness]

Seat Cushion Heating Power+ [Green/Violet or Blue/Violet]

Seat Cushion Heating Ground- [Brown or Brown/Orange, 1.5mm thickness]

Seat Cushion Temp. Sensor [Grey]

Seat Back Heating Power+ [Violet or Green/Violet]

Seat Back Heating Ground- [Brown, 1mm thickness]

BMW Bosch Motronic 1.3 DME/ECU: Wiring Diagram + Chip Layout

Diagrams showing the internal wiring structure of the Bosch 1.3 DME electronic control unit for injected BMWs that use it, E30, E28, E34, etc...

High quality PDF - HERE.

Bosch Motronic 1.1-1.3 DME Complete Guide - HERE.

Bosch Motronic Plug Connector Pinouts - HERE.

BMW E30 / E28 Diagnostic Plug / Socket Pin Out Diagram

PIN:	WIRE SIZE:	WIRE COLOR:	APPLICATION:
1	1.5	Brown	Ground Distribution G101
4	0.5	Brown / Violet	Gauges / Warning Indicators,
			Coolant Temperature Sender
5	0.5	White / Green	Fuel Control,
			Injector Control Module (Fuel Rate)
7	0.5	White / Blue	Service Indicator,
			Service Interval Processor (Reset)
11	2.5	Black / Yellow	Start, Start Signal
12	0.75	Blue	Charge System, Alternator,
13	0.75	Black	Ignition, Ignition Coil
14	2.5	Red	Charge System, Alternator
15	1.5	Green / Yellow	Idle Speed Control,
			Idle Speed Control Unit

BMW E30 Fuse Box Layout + Diagram

 

FUSE NO:	RATING:	APPLICATION:
1	7.5A	Headlights (also 2, 13, 16)
2	7.5A	Headlights (also 1, 13, 16)
3	15A	Auxiliary Fan (also 18)
4	15A	Lights: Turn/Hazard (also 24)
5	25A	Wiper / Washer
6	7.5A	Stoplights
7	15A	Horn
8	25A	Lights: Dash, Rear Defogger,
		Seatbelt Warning (also 10),
		Speedometer / Indicators (also 12)
9	15A	Idle Speed Control / Vacuum Advance,
		Reverse Lights
10	7.5A	Seatbelt Warning (also 8),
		Service Indicator (also 24),
		Tachometer / Fuel Economy Gauge (also 24),
		Gauges / Indicators, Brake Warning system,
11	15A	Fuel Delivery
12	7.5A	Radio (also 21),
		Speedometer / Indicators (also 8)
13	7.5A	Headlights (also 1, 2, 14)
14	7.5A	Headlights (also 1, 2, 13)
15	-	Not used
16	-	Not used
17	15A	Accessory Connector
18	30A	Auxiliary Fan (also 3, 19)
19	7.5A	Auxiliary Fan (also 3, 18),
		Interior Lights (also 21, 22, 27),
		Power Mirrors
20	30A	Heater / Air Conditioning (also 28)
21	7.5A	Auto-Charging Flashlight, Digital Clock,
		Glove Box Light, Ignition Key Warning,
		Interior Lights (also 14, 22, 27),
		Radio (also 12), Trunk Light
22	7.5A	Interior Lights (also 19, 21, 27),
		Lights: Front Park/Tail,
		Front Side Marker
23	7.5A	Lights: Dash, Front Park/Tail,
		Front Side Marker,
		Rear Marker / License Plate
24	15A	Lights: Turn/Hazard Warning (also 4),
		Tachometer / Fuel Economy Gauges (also 10),
		Service Indicator (also 10)
25	25A	Not used
26	25A	Not used
27	25A	Interior Lights (also 19, 21, 22),
		Central Locking
28	25A	Cigar Lighter, Power Antenna
29	7.5A	Fog Lights
30	7.5A	Fog Lights

E30 Speedometer Schematic / Wiring Diagram / Pinouts

 ** For E30 speedometer / odometer troubleshooting and repair guide see THIS POST. **

The arrangement is the same with both VDO and Motometer type gauges. 

Pins are: 

R - 12v +

31 - Ground

31b - Speed sensor INPUT Pin 1

A - Speed sensor Pin 2 *NOT USED*

Bench testing can be achieved by powering the unit with 12v and simulating the pulse of the speed sensor over the two remaining pins, either way around. This is essentially done by creating a pulse across the circuit of pin A and A1. You can do this by just bridging the two pins together with a piece of wire and touching the wire against one of the pins on and off to make the ‘pulse’, as this is basically how the speed sensor works, but simulate any kind of actual road speed you will need to be doing the on/off pretty quickly. A far better way to bench test is to use some kind of ‘pulse-generator’, such as an oscilloscope or something set up using an Arduino, which is what I used to create a pulse with 5 volts. I will post a guide soon.