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Wiring

08/01/06

A few people have asked if I have a wiring diagram for the car. Unfortunately I don't and as I'm totally useless at any kind of artwork, sketches or diagrams, I probably never will - it would take me years to do and it would be the size of a barn door.

I did however compile several tables that I referred to when wiring the car. These listed all the required components, connections and colour codes. I've reproduced them here in case others find them useful. 

Bear in mind that I used two donor cars - the main loom, column switches and instruments came from a 1990 Metro GTi 16V SPi. The engine loom and MEMS ECU (MKC101610) came from a 1994 Rover 414 SLi MPi.

Different models and years may have different colour coding and/or pin layouts, so use these tables at your own risk.

Here's what worked for me:

Fuse Box Wiring

Note: All relays except indicator relay also have built-in fuses.

Fuse

No.

In

Out

Colour

From

Colour

To

1

White/Red

Ignition switch ign terminal

Green

Green

Brake light switch

Instruments/warning lights

2

Red

Junction box permanent live

Brown

Purple

Side light switch (column switch terminal 30)

Clock

3

Green/White

Ignition switch acc terminal

Light Green

Cooling fan

4

White/Red

Ignition switch ign terminal

White

Green/Pink

White

Ignition coil + terminal

MEMS ECU pin 11

Fuel pump relay terminal 85

5

White/Red

Ignition switch ign terminal

Green

Indicators (column switch terminal 54)

6

Red

Junction box permanent live

Blue/Purple

Hazards & horn (column switch terminal H30)

7

Blue/Brown

Headlight switch (terminal 56B)

Blue/Pink

Blue/Black

Dip beam N/S

Dip beam O/S

8

Blue/White

Headlight switch (terminal 56A)

Blue/Slate

Blue/Green

Blue/Green

Main beam N/S

Main beam O/S

Main beam warning light


Column Switch Wiring

Terminal

Colour

Function/Destination

30

Brown

Side light permanent live from fuse box (Fuse 2)

58

Red

Supply to side lights

S54

Blue

Feed to headlight relay terminal 85

56

White/Blue

Headlight supply from headlight relay terminal 87

56A

Blue/White

Supply to main beam fuse (Fuse 8)

56B

Blue/Brown

Supply to dip beam fuse (Fuse 7)

H

Purple/Black

Supply to horn +

H30

Blue/Purple

Horn and hazard permanent live from fuse box (Fuse 6)

49

Light Green/Purple

To terminal 49 of flasher relay

49A

Light Green/Brown

To terminal 49A of flasher relay

54

Green

Ignition switched live from fuse box (Fuse 5)

31

Black

Earth

L

Green/Red

Feed to left (N/S) indicators, repeater & warning light

R

Green/White

Feed to right (O/S) indicators, repeater & warning light


 Engine Loom Wiring

Number

Colour

Function/Destination

1

White/Black

To coil ? terminal from pin 25 of MEMS ECU

2

Black/Green

Earths LT of ox sensor relay (terminal 86) through pin 36 of MEMS ECU

3

Green/Yellow

Reverse light switch feed (not used on my car)

4

Green/Brown

To reverse lights from switch (not used on my car)

5

Green/Blue

Temperature gauge sender from temperature gauge

6

Brown/Yellow

Alternator from ignition warning light

7

White/Brown

Oil pressure light switch from warning light

8

Yellow/Orange

Earths purge valve through pin 21 of MEMS ECU (not used on my car)

9

Brown/Pink

Injectors, stepper motor, fuel canister purge valve and MEMS ECU pin 28 supply from main (ignition) relay terminal 87

10

Brown/Red

Starter motor solenoid from ignition switch

11

Brown/Blue

Oxygen sensor heater supply from oxygen sensor relay terminal 87

12

White/Pink

Earths LT of main relay (terminal 86) through pin 4 of MEMS ECU

13 Green/Pink Ignition switched supply from fuse 4 to MEMS ECU pin 11

 Wiring to front of car

Number

Colour

Function/Destination

1

Green/Red

N/S indicator and repeater

2

Green/White

O/S indicator and repeater

3

Red/Black

N/S side light

4

Red/Orange

O/S side light

5

Blue/Slate

N/S main beam

6

Blue/Pink

N/S dip beam

7

Blue/Green

O/S main beam

8

Blue/Black

O/S dip beam

9

Black/White

Master cylinder cap switch from warning light

10

Green

Live supply to brake light switch from fuse 1

11

Green/Purple

Brake lights feed from switch

12

Purple/Black

Horn positive from column switch terminal H

13

Light Green

Radiator fan switch supply from fuse 3

14

White/Black (1)

Ignition coil negative from tachometer

15

White/Black (2)

Ignition coil negative from ECU pin 25

16

White

Ignition coil positive supply from fuse 4


Wiring to instruments and warning lights.

Number

Colour

Function/destination

1

Brown/Yellow

Ignition warning light

2

White/Brown

Oil pressure warning light

3

Grey/black

Brake warning light to handbrake lever switch

4

Black/white

Brake warning light to master cylinder cap switch

5

Green

Ignition switched live to tachometer, clock, ignition warning light, oil pressure warning light and brake warning light from fuse box (fuse number 1)

6

Green/blue

Coolant temperature sensor

7

White/black

Tachometer feed from coil - terminal

8

Green/black

Fuel gauge sender in tank

9

Black

Earth

10

Red/orange

Instrument lighting from sidelight feed

11

Blue/green

Main beam warning light from main bean feed

12

Green/red

Left flasher warning light

13

Green/white

Right flasher warning light

14

Purple

Clock permanent live from fuse box (fuse number 2)


MEMS ECU Wiring

Note: There is no permanent live connection to this ECU.

Pin Number

Colour

Function/Destination

1

Yellow/Black

Number 4 injector earth

2

Pink/Blue

Stepper motor phase 2

3

Orange/Grey

Stepper motor phase 1

4

White/Pink

Earths LT side of main (ignition) relay (terminal 86)

5

 

No connection

6

 

No connection

7

Grey

Oxygen sensor signal supply (not heater)

8

Yellow/Green

Throttle position sensor signal

9

Yellow/Purple

Throttle position sensor supply

10

White/Yellow

Diagnostic socket

11

Green/Pink

Ignition switched positive supply from fuse 4

12

 

No connection

13

 

No connection

14

Black

Earth

15

Black/Green

Diagnostic socket

16

Green/Black

Air temperature sensor

17

 

No connection

18

Light Green/Grey

Oxygen sensor return

19

 

No connection

20

Black/Purple

Earths LT circuit of fuel pump relay (terminal 86)

21

Yellow/Orange

Earths Fuel canister valve

22

Orange/Green

Stepper motor phase 3

23

Yellow/Red

Number 2 injector earth

24

Yellow/Brown

Number 1 injector earth

25

White/Black

Coil negative

26

Yellow/White

Number 3 injector earth

27

Orange/Blue

Stepper motor phase 4

28

Brown/Pink

Positive feed from main (ignition) relay terminal 87

29

Black

Earth

30

Pink/Black

Coolant, air & throttle sensors earth

31

Blue/Purple

Crank sensor supply

32

White/Blue

Crank sensor return

33

Pink/Green

Coolant temperature sensor

34

 

No connection

35

 

No connection

36

Black/Green

Earths LT side of Oxygen Sensor relay (terminal 86)

Pin Layout (front view):

 

36

35

34

33

32

31

30

29

28

27

26

25

13

14

15

16

17

18

19

20

21

22

23

24

 

 

12

11

10

9

8

7

6

5

4

3

2

1


Wiring to rear of car

Number

Colour

Function/destination

1

Green/red

N/S indicator

2

Green/purple

Brake lights (from brake light switch)

3

Red/black

N/S tail light

4

Blue/Yellow

Rear fog light (from fog light switch)

5

Green/White

O/S indicator

6

Red/Orange

O/S tail light

7

Grey/Black

Handbrake switch (from warning light)

8

Green/black

Fuel gauge sender unit (from fuel gauge)

9

White/green

Fuel pump supply (from fuel pump relay terminal 87)


Relay Wiring

Note: All relays except indicator relay have built-in fuses.

Headlight Relay

Terminal

Colour

Function/Destination

30

Red (Brown on donor)

Permanent live from junction box

85

Blue

Feed from column switch terminal S54

86

Black

Earth

87

87

White/Blue

Blue/Yellow

Supply to column switch terminal 56.

Supply to fog light switch via in-line fuse

 

Main (Ignition) Relay

Terminal

Colour

Function/Destination

30

Red (Brown on donor)

Permanent live from junction box

85

Red

Permanent live from junction box

86

White/Pink

To terminal 4 of MEMS ECU

87

Brown/Pink

Supply to MEMS ECU terminal 28, fuel injectors, stepper motor and terminal 85 of oxygen sensor relay.

 

Fuel Pump Relay

Terminal

Colour

Function/Destination

30

Red (Brown on donor)

Permanent live from junction box

85

White

Ignition switched live from fuse box (Fuse 1)

86

Black/Purple

To terminal 20 of MEMS ECU

87

White/Green

Supply to fuel Pump

 

Oxygen Sensor Relay

Terminal

Colour

Function/Destination

30

Red (Brown on donor)

Permanent live from junction box

85

Brown/Pink

Feed from terminal 87 of Main relay

86

Black/Green

To terminal 36 of MEMS ECU

87

Blue/Red

Supply to Oxygen sensor heater circuit

 

Indicator Relay

Terminal

Colour

Function/Destination

31

Black

Earth

49

Light Green/Purple

From terminal 49 of column switch

49A

Light Green/Brown

From terminal 49A of column switch


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