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Electrical MCS Engine Bay Fuse Box Diagram and wiring

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Electrical MCS Engine Bay Fuse Box Diagram and wiring

  #1  
Old 08-14-2003, 09:50 AM
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There have been several threads about fuse boxes and wiring diagrams, but we are no closer to having a usable listing of fuses and the circuits they protect.

With this thread, I am attempting to collect this information with the help of all the knowledge here on MCO. I will do this separately for the engine bay fuse box and the internal fuse box located under the dash, for the 03 MCS, since that is what I have and can investigate. If someone else would like to do the same for the MC, or other years of production (02,04), that would be great.

Here is how I'm hoping we can work this out. In the picture and diagram below the components in the boxes are labeled / numbered. Anyone can then respond to the post and state: F1 is the fuse for circuit XYZ, R1 is the relay for ABC...
Please state very clearly in your reply whether you are certain about the information you are posting (preferably tested in some way), or whether you are merely guessing or passing on infromation you have heard or read somewhere else.

I am hoping that this way we can compile all the necessary information. If enough input comes in, then I will compile all that and summarize it in a post at the end of this thread.

Below is a photo of the diagram in the fuse box cover of the engine bay fuse box of an 03 MCS (this image was downloaded from another site, and I do not know the author of the photo):



Here is a schematic of same box listing components in the box from the label in the box lid:


In my particular car, in the location labeled as 'SPARES' is a connector.
In the location labeled 'BATTERY' is a ground strap connector.
The location labeled FL10 is empty.
All other locations are occupied as labeled.

Here is my initial, unverified interpretation of what I am looking at:
R stands for Relay, F for Fuse. FL I believe also stand for some kind of Fuse, but one for a larger load

Specific 'guesses' for relays:

R1: don't know
R2: A/C
R3: engine cooling fan (radiator fan)
R4: don't know
R5: wiper (eitehr front or rear)
R7: other wiper
R6: Some light, maybe hi-beams?

Specific guesses for FL hi-load fuses:

FL6: ABS system
FL7: don't know
FL8: some lights
FL9: some fan, but which one?
FL10: don't have, could be for heated windshield?
FL11: engine coolant fan (radiator fan)?
FL12: some lights.

Specific guesses for F-fuses:

F1: don't know
F2: don't know
F3: don't know
F4: don't know
F5: don't know
F6: not sure, ABS?
F7: AC?
F8: engine coolant fan?
F9: wipers?
F10: some lights?

allright, let's see if we can compile some useful info here,
thanks in advance with your help with this!

Markus
 
  #2  
Old 08-14-2003, 10:26 AM
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  #3  
Old 08-14-2003, 10:08 PM
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Thanks for getting this thread going.

My only addition at this point is that my less-than-confidence-inspiring service manager told me that, on my 02 MC:

F5: Power Steering AND Engine Cooling Fans (only 5A)

This is a critical weak link in the cooling system.
 
  #4  
Old 08-15-2003, 09:45 AM
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Based on ownership of a number of english cars, here is my interpretation of the icons.
F1, F2, F3, F4, F5, R1 - Engine power.
F6, FL6 - ABS
F7, R2 - AC
F8, FL11, R3 - radiator fan, maybe one is the ps fan?
F9, R5, R7 - Front wipers
F10, R6 - headlights
FL8, FL12 - indicators
FL9, R4 - fan, maybe AC fan?
FL10 - front demister.
FL7, I have no ide.
 
  #5  
Old 02-11-2008, 08:50 AM
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Is there any special way to remove Fuses R5 or R7. I was pulling up but they wouldn't budge and I need to get them out in order to check if they are burnt out since my front wipers are not working.
 
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Old 02-26-2008, 06:08 PM
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I don't have fuse guides, but I can get full wiring diagrams for any of these systems.

 
  #7  
Old 07-29-2008, 09:46 AM
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It's a shame this thread kind of died out. I'd like to kick in some information about part of this:

R3 is most definitely the radiator cooling fan, but I am not sure what R4 is. here's it's behavior:

If you remove the relay you'll see the following pattern. The numbers next to each line refer to their equivalents on the relay itself. There is a fifth 'connector' dead center, but it is unused on all four ports.

85
|
30-- --86
|
87

Okay, that said.

The control circuit is 85-86. If current is applied to 85 and 86 the relay will close, completing the circuit for 30-87, allowing 12V current to flow. But the behavior for each of the relay circuits is different.

30-87 always have 12V current running through them, but the circuit does not complete unless 85-86 get current to close the relay. In other words, without the relay closed, no power is getting to anywhere else.

R4 - "Fan" symbol. 85-86 have no current when the vehicle is off, and 12V current when the vehicle is in the "ON" position (or fully started), whatever. (NOTE!!!) It has been brought to my attention since then that this may be the low or high speed relay.

R3 - Radiator Cooling Fan. 85-86 have no current when the vehicle is off or on, unless 'something' happens to supply current. I have no idea what feeds those 85-86 on this connection. Something from the coolant temperature setting, perhaps? Anyway, all that aside, if 85-86 get current applied to them, 12V power will be pushed down to the primary power connector for the radiator fan assembly. However, there is yet another relay (exactly like this one) inside the fan house. Current must be supplied to the control cable (the one right next to the power connector for the fan) in order to close the relay inside in the fan housing. Wierd. More on that later tonight..... (NOTE!!!) It has been brought to my attention since then that this may be the low or high speed relay.

R2 - A/C - 12V current appears to be supplied on 85-86 whether the power is on or off, but if R4 is not engaged, no fan.

R1 - Engine power. Removing this relay kills the engine. 12V current is applied on 85-86 whether the vehicle is on or off.
 

Last edited by ionia23; 07-29-2008 at 10:08 AM. Reason: new information
  #8  
Old 08-31-2008, 03:29 PM
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Fuses, Relays & Earth (or Ground Points in USA?)
If you don't have the excellent Bentley MINI manual to hand this is a useful and comprehensive list of:-
MINI Fuses / Relays / Earth or Ground Points

Engine compartment fusebox
F1 5A Digital engine electronics control unit
F2 20A Digital engine electronics control unit/Ignition coil/Cylinder 1-4 fuel injection valves/Crankshaft position sensor (From K6300 87)
F3 15A Camshaft position sensor/O2 sensor before cat/O2 sensor after cat/Solenoid valve, fuel tank ventilation/Relay K19 control power (From K6300 87)
F4 15A Tank Leakage diagnosis pump
F5 5A Relay, engine cooling electric fan (From K6300 87)
F6 30A ABS/ASC/DSC control module
F7 30A Magnetic clutch for AC compressor via relay K19
F8 30A control power K69923 Relay, electric power steering pump cooling fan/Switch unit Heating & A/C blower
F9 20A BC1 (X11177 2) unit via I01136 and I01137 (Relay front wiper motor fast/slow and Relay front wiper motor on/off)
F10 15A BC1/Left fog/Right fog/Switch panel via K47

FL1 50A Feed to F14, F31, F32 (BC1,Heating & Air con blower, cigarette lighter)
FL2 50A Feed to F1, F2, F3, F4, F19, F20, F21, F22, F23, F24, F25, F26, F27, F28, F37 (BC1, steering angle sensor, clock, instrument cluster, navigation, on-board monitor, wash/wipe, horn, audio system.)
FL3 40 A Convertible top control
FL4 100A Electric Steering control unit/Hydraulic pump
FL5 50A Feed to F15, F16, F17 (Sunroof, aerial antenna, rear wiper)
FL6 40A ABS/ASC/DSC unit
FL7 50A Feed to ignition switch
FL8 50A BC1 (X332 20) Headlight
FL9 50A DME unit and Switching unit 2-speed blower via I01135 (Relay electric engine cooling fan)
FL10 50A K416, Relay heated front screen
FL11 50A Switch unit, 2-speed blower heating & air con
FL12 50A BC1 (X332 17) Headlight

F01 5A Engine Control Module (ECM), Convertible top control Module
F02 20A ECM, ignition coil, fuel injectors, crank position sensor
F03 15A Engine control
F04 15A Engine control
F05 5A Engine cooling fan
F06 30A ABS/ASC/DSC
F07 30A Air Con compressor
F08 30A Heating A/C blower, EHPS cooling fan
F09 20A Windscreen wipers
F010 15A Parking lights
(Sometimes F0 fuses above are labeled F only in Eng. Comp. Fusebox)

Passenger compartment fusebox
F1 30A BC1 (X332 3) power windows LH
F2 5A Steering angle sensor
F3 5A Digital clock/Outside mirror fold-in control unit
F4 5A BC1 (X254 27) Constant power
F5 5A Control module for instrument cluster/Diode (From Electronic immoblizer control unit)
F6 5A Brake light switch/Clutch switch module/Electronic immobilizer control unit EWS
F7 5A BC1 (X254 36)/Rain sensor
F8 5A Turn indicator/low beam switch
F9 5A Control module for instrument cluster
F10 5A Navigation computer/On-board monitor control unit/Radio control unit
F11 5A K119, Relay, rear washer pump/K5 Relay, front washer pump
F12 20A Ignition switch to heated seats
F13 5A Reversing light switch/CVT switch
F14 10A BC1 (X332 14) Constant power to interior/reading lamps
F15 20A Sunroof module control unit
F16 30A BC1/Rear window w/o antenna or Wave trap 1 w/ rear window antenna via K13/ Heated rear screen
F17 15A BC1 (X254 43)/Rear window wiper motor via I01142 (Relay rear wiper motor)
F18 5A Hall sensor driver & passenger buckle/Multiple restraint system (MRS system)
F19 30A BC1 (X332 7) power windows RH
F20 20A K96, Fuel pump relay 1
F21 10A Control module for instrument cluster
F22 15A On board monitor control unit/Navigation computer/Eject box
F23 20A K5 Relay front washer pump/K119 relay rear washer pump
F24 5A Electronic immobilizer control unit/Horn for antitheft alarm system EWS
F25 30A Headlight washer pump via K6
F26 10A Automatic transmission
F27 15A Radio control unit/CD Changer/Amplifier
F28 15A Volute spring/Right horn/Left horn via K2
F29 5A Heating and AC control module/Sensor interior temperature fan
F30 5A Instrument cluster
F31 30A BC1 via K4 (X253 23) Heating & A/C blower
F32 15A Front cigar lighter via I01151 (Relay cigarette lighter front)
F33 10A ABS/ASC/DSC unit
F34 10A Digital engine electronics control unit direct and via K96/Eng management main relay
F35 5A Mirror adjustment switch/Electrochrome rear view mirror/Windscreen washer jet heater/Outside mirrors
F36 5A K416, Relay Heated front screen
F37 20A BC1 (X332 1) Central locking
F38 -
F39 5A Alternator/Electric Steering control unit/hydraulic pump
F40 5A Control module for instrument panel/Switch panel/Steering angle sensor
F41 5A Park distance control unit/power to K69923, Relay fan steering control module/pump
F42 -

(MCS Only - Luggage compartment fusebox, MC/One direct battery feed)
F100 250A Feed to FL1, FL2, FL4, FL5, FL6, FL7, FL8, FL9, FL10, FL11, FL12, F1, F6, F7, F8, F9, F10, K6300

For Ref.
BC1 (Body Control Unit)
Located behind kick panel - drivers footwell (UK) / passengers footwell (USA / Europe)
4 Connectors:-
X332 20 pin (green)
X253 54 pin (black)
X254 54 pin (natural)
X255 54 pin (blue)

IDs for Relays / Location
K42 Horn relay / Behind Passenger compartment fusebox
K4 Heater-blower relay (up to March 2003) / Engine compartment fusebox
K4 Heater-blower relay (from March 2003) / Passenger compartment fusebox
Control: BC1 (X253 23)
Switch: M30/A11
K5 Relay washer pump front / Behind passenger compartment fuse panel
K6 Relay Headlight washer / Passenger compartment fusebox
K13 Relay rear window defroster / Behind Passenger compartment fuse panel
Control: BC1 (X254 22)
Switch: Rear window defroster
K19 Relay AC Compressor / Engine compartment fusebox
K47 Front fog light relay / Engine compartment fusebox
Control: BC1 (X254 40)
Switch: Left fog light/Right fog light/Switch panel light
K96 Fuel pump relay / Passenger compartment fusebox
Control: A6000 (X60004 24)
Switch: M2
K104 Relay auxiliary water pump
K119 Relay washer pump rear / Behind passenger compartment fuse panel
K416 Relay heated windshield
K6300 DME Main Relay / Engine compartment fusebox
control: A6000 (X60004 16)
Switch: F02/F03/F04/F05
K69923 Relay EHPS fan power steering / Behind passenger compartment fuse panel
I01135 Relay Engine cooling fan stage 2 (from March 2003) / Engine compartment fusebox
I01136 Relay front wiper fast/slow / Engine compartment fusebox
I01137 Relay front wiper on/off / Engine compartment fusebox
I01142 Relay rear wiper / Behind Passenger compartment fusebox
I01148 Relay Shiftlock / Passenger compartment fusebox
I01151 Relay front cigarette lighter / Behind Passenger compartment fusebox
I01152 Relay Engine cooling fan stage 1 / Engine compartment fusebox

Body Earth Locations
E1 LH rear of engine compartment
E2 LH front of engine compartment
E3 RH front of engine compartment
E4 RH side of footwell
E5 LH door sill
E6 LH side of luggage compartment
E7 RH side of luggage compartment
E8 RH door sill
E9 LH door sill
E10 Behind LH rear window trim panel
E11 Behind RH rear window trim panel

(please feel free to add more updates for later cars or correct any errors or omissions)
 
Attached Thumbnails MCS Engine Bay Fuse Box Diagram and wiring-2003-mcs-dash-fuse-box-diagram.jpg   MCS Engine Bay Fuse Box Diagram and wiring-2003-mcs-engine-bay-fuse-box-diagram.jpg   MCS Engine Bay Fuse Box Diagram and wiring-2003-mcs-engine-bay-fuse-box-image.jpg  
  #9  
Old 01-13-2009, 08:55 AM
thecigarman
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These lists show the PS fan fuses and relays (and the FL4 100A Electric Steering control unit/Hydraulic pump)

K69923 Relay EHPS fan power steering / Behind passenger compartment fuse panel

F39 5A Generator/Steering control unit/hydraulic pump
F40 5A Control module for instrument panel/Switch panel/Steering angle sensor
F41 5A Park distance control unit/power to K69923, Relay fan steering control module

F8 30A control power K69923 Relay, electric power steering pump cooling fan/Switch unit Heating & A/C blower (engine compartment [panel)


Did I miss any?

Do the relays control power to the PS pump or only the PS fan?
 

Last edited by thecigarman; 01-14-2009 at 04:29 AM.
  #10  
Old 01-19-2009, 07:30 PM
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Originally Posted by thecigarman View Post
These lists show the PS fan fuses and relays (and the FL4 100A Electric Steering control unit/Hydraulic pump)

K69923 Relay EHPS fan power steering / Behind passenger compartment fuse panel

F39 5A Generator/Steering control unit/hydraulic pump
F40 5A Control module for instrument panel/Switch panel/Steering angle sensor
F41 5A Park distance control unit/power to K69923, Relay fan steering control module

F8 30A control power K69923 Relay, electric power steering pump cooling fan/Switch unit Heating & A/C blower (engine compartment [panel)


Did I miss any?

Do the relays control power to the PS pump or only the PS fan?
F08 provides direct battery + through the relay contacts, then through a series resistor and then finally to the radiator fan; the fan is in low speed (due to the series resistor) when the relay contacts are closed.

F08 does not power relay K69923.

F05 provides power to one side of the coil for both relays in addition to providing power to one side of the normally open contacts of relay K69923; when these contacts close power from F05 is brought over to the small power steering fan mounted on the PS pump as well as relay coil mounted on the fan shroud (aka switching unit 2-stage blower), when the switching unit turns on its contacts close and power is delivered directly from FL11 to the radiator fan motor; the motor runs in high speed.

The PS fan motor will only run when the radiator fan is commanded to run in high speed.

The radiator fan is commanded to low speed when the ECT reaches 105c.
The radiator fan will turn off when the temp drops by 4c.

If the low speed is working the temp will never get to 112c which is where the radiator fan is commanded to high speed.

Based on this analysis it appears that the engine will have to come close to overheating before the PS fan will run.

The radiator fan will not run when driving at highway speed due to forced air cooling.

Hope this helps!
 

Last edited by frenchie; 01-19-2009 at 07:41 PM.
  #11  
Old 01-20-2009, 07:39 AM
thecigarman
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Great, but can you also trace the power to the PS Pump? My problem is outlined here:
https://www.northamericanmotoring.co...t-is-dead.html

Thanks
 
  #12  
Old 01-20-2009, 11:53 AM
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PS Pump Wiring Detail

Originally Posted by thecigarman View Post
Great, but can you also trace the power to the PS Pump? My problem is outlined here:
https://www.northamericanmotoring.co...t-is-dead.html

Thanks
I did a cut and paste from the Bentley manual web site where I posted this some time ago under the user name of FlyTheCoop.

There are two connectors on the pump; below I describe what each wire is used for.

On the 2 pin connector, pin 2 goes directly to battery positive terminal through a 100a fusible link located on the bottom of the fuse box under the hood (aka terminal 30). Pin 1 goes directly to battery negative terminal (aka terminal 31). These two wires provide the heavy current to run the pump. Since these are direct (not switched) battery voltage should be present at all times between these two wires.

On the three pin connector, pin 1 should have battery + when the key is on (aka terminal 15). Pin 2 goes to the alternator and should reflect the output of the alternator when the engine is running (this signal is used to tell the pump electronics that the engine is running). The pump will not run if it thinks the engine is off unless its bad). Also the voltage found here must be no lower than 9vdc and no higher than 16vdc; the pump will shut down if outside of this range.
Pin 3 is used to communicate pump errors on the diagnostic bus.

The pump operates in two modes: standby and full output.When the car is idling and no steering demand is present the pump is in standby mode; it runs at 80% capacity and an rpm of 3500...the current draw is 7amps +/- 10%.

When the steering is turned, the pump senses a pressure change in the hydraulics..this change causes the pump to switch to full output and runs at 100% and at an rpm of 4500.

If the steering is turned to either end of its travel, or if the wheel hits a curb, the current to the pump is momentarily reduced to 30amps.


If the temperature gets to 230f (110c) the operating current of the pump will be reduced.

The pump contains the controller and will produce the following errors if a problem is detected.
Power supply fault
Electric motor fault
Fault caused by excess temperature
Control module fault


Hope this helps.
 
  #13  
Old 02-05-2009, 09:20 PM
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What fuse do you pull to stop the Seatbelt alarm from going off?
 
  #14  
Old 02-06-2009, 04:28 PM
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Does anyone know how to disable the headlight washers? It's annoying to keep turning off the headlights to spray my windshield.
 
  #15  
Old 08-09-2010, 07:57 AM
txshan130
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Hey Everyone -
I'm having some "key-off" power drain issues and have traced it to Fuse 27...in other words when I pull Fuse 27 with the key off, my power consumption goes from 176 ma to about 30 ma. I thought this fuse was for the radio, but after I pulled the fuse, the radio still worked???? Does anyone know exactly what this fuse protects?

Thanks....
 
  #16  
Old 08-09-2010, 09:10 AM
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F27 does refer to the "power" portion of the stereo system, to include the stereo, any amps, cd changer, etc. Stereos work on two circuits, accessory power and direct battery power. Accessory power is when the items power up to play music, which is operated by the stereo on/off button. The direct battery power is usually for any memory items (i.e. station presets), as well as being able to eject or insert a CD in the deck. It also works the CD changer eject option for the cartridge.

If you have an aftermarket amp, see if it's powered on when you turn your MINI off. If it is, you may have an issue with it or with the remote power lead.
 
  #17  
Old 01-15-2011, 10:18 PM
buellmc
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do you have to remove the (under the hood fuse panel) to remove the wiper relays on the 2002 mini
 
  #18  
Old 01-30-2011, 07:51 PM
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buellmc, the relays should only be active when the wipers are on. You should be OK if they need to be changed.
 
  #19  
Old 03-11-2011, 12:44 PM
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R6 under the hood is the relay to the foglights.
 
  #20  
Old 07-05-2011, 06:07 PM
MyMiniIsRed
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Fl1-5

My daughter has a 2004 mini cooper, and the other day it seems like half the electrical system failed. Sunroof, A/C, radio controls, most of the dashboard, the turn-signal indicators (but not the turn signals themselves - they are ok). I checked the fuses, and they were ok. We took it to our usual mechanic, but he couldn't find it either. With the help of this thread, I think I may have a suspect - FL1.


FL1 50A Feed to F14, F31, F32 (BC1,Heating & Air con blower)

Problem is, I can't find it anywhere. I saw on another thread that it was under the engine compartment fusebox. I tried to remove it but the large wire in the back was too tight for the wrench I had, so I could only lift it a little. I didn't see anything, but maybe there was another panel I couldn't see. Can someone clarify where this fuse is located, and if it may indeed be the culprit?
 
  #21  
Old 07-06-2011, 10:58 PM
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Common issue with weird electrical issues is most likely a bad battery. Search the forum; you'll find many other persons with similar weirdness. Most likely one of the cells in it went dead. If you're on the OEM battery, the small window will be clear or black.

Originally Posted by MyMiniIsRed View Post
My daughter has a 2004 mini cooper, and the other day it seems like half the electrical system failed. Sunroof, A/C, radio controls, most of the dashboard, the turn-signal indicators (but not the turn signals themselves - they are ok). I checked the fuses, and they were ok. We took it to our usual mechanic, but he couldn't find it either. With the help of this thread, I think I may have a suspect - FL1.


FL1 50A Feed to F14, F31, F32 (BC1,Heating & Air con blower)

Problem is, I can't find it anywhere. I saw on another thread that it was under the engine compartment fusebox. I tried to remove it but the large wire in the back was too tight for the wrench I had, so I could only lift it a little. I didn't see anything, but maybe there was another panel I couldn't see. Can someone clarify where this fuse is located, and if it may indeed be the culprit?
 
  #22  
Old 08-18-2011, 12:13 PM
badnewsmini
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So where is FL4? My powersteering pump wont shut off. I want ot just pull the link till I can get it to the dealer so it doesnt burn out the pump.
 
  #23  
Old 07-05-2015, 05:35 AM
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engine fuse box mystery fuse

JCW -09 have blown fuse f7 --on this car its 7.5 A
fuse cover shows engine control symbol for f7 -everywhere I look shows ac clutch 30 A in this fuse position
 
  #24  
Old 07-06-2015, 11:41 AM
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pigway, your question is for a 2nd-Gen MINI and should be asked in that forum section. The fuse listing here is for 1st-Gen MINIs.
 
  #25  
Old 07-08-2015, 01:14 PM
ItJustDiz
ItJustDiz is offline
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Join Date: Mar 2014
Location: Nor Cal
Posts: 20
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Anyone know if there is another fuse that might affect the fuel pump on an r53(05)other than F20??

That fuse looks peachy but I'm not getting any fuel. Hoping to exhaust all suspects before removing the back seat and digging into the tank.

Cheers,
D
 

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