Features - Special Edition No. III
The delayed Power Signal (updated 12.08.03/5)
Who did not already get angry about this ?
The main relay output signal is delayed for about 30 seconds until 1 1/2 minutes controlled by MEMS ECU. So enough time for young and old MGF Enthuthiasts to move the windows or open the boot. Carl sent the instruction by fax and eMail and I tried to build this web based instruction.
This instruction includes two ways to get the wiring done.
blue = bypass crimp connector
3. diode package preparation
4. MEMS ECU Side wiring
MGF without Aircon:
Principals explained at the ECU Main Relais diagram
This small copy of the MEMs wiring explains the rear located main relay,
located under the ECU and the brown-pink wire which leads the delayed
power signal to several actuators of the car. i.e to the purge valve.
Getting the Power delay signal from rear to the front of the car
4.1 Option for cars if an NO aircondition is installed .
Locate the needed cable as follows at the rear:
When looking at ECU units left side you will see a black connector fastened to the black bracket which holds the ECU at th rear panel. Find the Blue Yellow wire. It has no connection on the right side of the connector, if no aircon is installed. This wire leads to the front under the dash board area to the not used but at each MGF existing white coloured multi connector for the aircon. We use this wire as substitute for the in other case to lead new long wire. you can cut it or use a bypass crimp connector to add a bypass wire to the brown-pink wire of the ECU.
Attach a connector or bypass and cable which is long enough to reach
the thin Brown Pink cable on the purge valve. This one is located slightly
to the right of the MEMS ECU unit. It is a black plastic container with
several hoses . On its top is a electric valve and 2 cables.
Locate the cable as follows at the front:
LHD cars Near the window lift relay at extreme left you will find a loose white coloured multi connector . This connector is supposed to go to the relaybox for the aircondition if fitted. Check the cables for the Blue Yellow. You can cut this wire or add a bypass crimp connector and wire of about 30cm lenght for the further works.
RHD cars you will find a loose white coloured multi connector
at the co-Drivers side, just near the upper hinge of the door behind the
footwell carpet. This connector is supposed to go to the relaybox for
the aircondition if fitted. Check the cables for the Blue Yellow. You
can cut this wire or add a bypass crimp connector and wire of about 1.50
m lenght for the further works. You need to lead this wire to the drivers
side where you find the window lift relay is at extreme right.
Jump to 5. and leave out 4.2 if you have no aircon
|4.2. Option for MGF with Aircon|
connect a 4m long wire to the Brown-Pink wire and lead it to the front of the car to the fuse box.
(here the location of the brown-pink wire at the ECU) (c)picture courtesy Cyril Winkler
The way to the front leads below the left boot lid hinge to the rear left side of the cabin where the engine cover carpet is located. Find the oval grommet behind the caropet and lead the cable there to the cabin along the door frame to the fusebox.
5. Final front wiring for both options
Look at the Windows electrical diagram. Find the 453 window lift relay.
Find cable LG (Light green) and cut it.
5.1 Location of the Window Lift Relay
Open up the cover for "Passenger Compartment Fusebox". Remove the cover
by loosening 2 screws at the hinge. Slight loosening is enough to draw
lid outward and removal. You can now see the fuses in a grey coloured
box and at the left corner 3 relays at the metal frame of the fuse box.
To get better access remove 2 nuts holding plastic fuseholder. Let this
unit hang down. You now can see the cables going to the 3 relays. The
upper relay is the Window lift relay. To this relay there are cables going
in following colours:
It is the thin Light Green that is the one which shall be cut in a manner that enough cable exists at both ends for connection. The Light Green going to the relay connects to terminal "C" the other Light Green to terminal "B" of our diode package.
Connect side "A" of the diode package to the
All work at the fusebox is now completed. Reinstall the fuseholder and the lid.
(c) Carl, the great from Sweden, Release 06.02.00 Some of the pictures, courtesy Cyril Winkler, Switzerland, edited and enhanced by Dieter Koennecke enhanced for RHD cars by Paul Lane.
Update MGTF: 2002
The MGTF has this feature included. See for the existing harness.
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