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[Big_Al]

hi all,
             have been messing with the non functional S/Levelling system on my '98 MFL  elite.

Story so far : compressor not switching on at all . ~Done the test with the small link arm removed from the suspension  - still nothing.

 Checked all around for loose connections & found that the exhaust had melted through the loom of wires from the SL switch  at the back of the car.  removed switch & damaged loom . Repaired all wires by carefully soldering together & insulating  each one . Re fitted & connected - still nothing.

Rob G suggested  the relay to the left side in cabin . Swapped as advised with the main beam relay  - still no S/L but main beam will not work with S/L relay installed. Switched them back & main beam is OK again. 

Looks as if S/L relay is suspect but why does it work the main beam OK. Also checked fuse 27 right at the start of this problem & is OK.

Today removed S/L pump/compressor & fed 12volts to it direct as advised by Rob G  -  all works fine  - so not pump either.

Not too good with wiring diagrams but thought about trying find which 2 wires from the rear mounted switch if touched together would operate the compressor  - if this is a possibility ?

Any help greatly appriciated          Regards, Al

[RobG]

hi all,
             have been messing with the non functional S/Levelling system on my '98 MFL  elite.

Story so far : compressor not switching on at all . ~Done the test with the small link arm removed from the suspension  - still nothing.

 Checked all around for loose connections & found that the exhaust had melted through the loom of wires from the SL switch  at the back of the car.  removed switch & damaged loom . Repaired all wires by carefully soldering together & insulating  each one . Re fitted & connected - still nothing.

Rob G suggested  the relay to the left side in cabin . Swapped as advised with the main beam relay  - still no S/L but main beam will not work with S/L relay installed. Switched them back & main beam is OK again. 

Looks as if S/L relay is suspect but why does it work the main beam OK. Also checked fuse 27 right at the start of this problem & is OK.

Today removed S/L pump/compressor & fed 12volts to it direct as advised by Rob G  -  all works fine  - so not pump either.

Not too good with wiring diagrams but thought about trying find which 2 wires from the rear mounted switch if touched together would operate the compressor  - if this is a possibility ?

Any help greatly appriciated          Regards, Al

Could have fried the ECU as it`s in-built inside sensor box.
What colour and how many wires you got at sensor plug and do they match to corresponding connector

[Big_Al]

hi all,
             have been messing with the non functional S/Levelling system on my '98 MFL  elite.

Story so far : compressor not switching on at all . ~Done the test with the small link arm removed from the suspension  - still nothing.

 Checked all around for loose connections & found that the exhaust had melted through the loom of wires from the SL switch  at the back of the car.  removed switch & damaged loom . Repaired all wires by carefully soldering together & insulating  each one . Re fitted & connected - still nothing.

Rob G suggested  the relay to the left side in cabin . Swapped as advised with the main beam relay  - still no S/L but main beam will not work with S/L relay installed. Switched them back & main beam is OK again. 

Looks as if S/L relay is suspect but why does it work the main beam OK. Also checked fuse 27 right at the start of this problem & is OK.

Today removed S/L pump/compressor & fed 12volts to it direct as advised by Rob G  -  all works fine  - so not pump either.

Not too good with wiring diagrams but thought about trying find which 2 wires from the rear mounted switch if touched together would operate the compressor  - if this is a possibility ?

Any help greatly appriciated          Regards, Al

Could have fried the ECU as it`s in-built inside sensor box.
What colour and how many wires you got at sensor plug?

8 wires Rob   .... Colours ? will have to go and have a look    give me 15 mins

[RobG]

hi all,
             have been messing with the non functional S/Levelling system on my '98 MFL  elite.

Story so far : compressor not switching on at all . ~Done the test with the small link arm removed from the suspension  - still nothing.

 Checked all around for loose connections & found that the exhaust had melted through the loom of wires from the SL switch  at the back of the car.  removed switch & damaged loom . Repaired all wires by carefully soldering together & insulating  each one . Re fitted & connected - still nothing.

Rob G suggested  the relay to the left side in cabin . Swapped as advised with the main beam relay  - still no S/L but main beam will not work with S/L relay installed. Switched them back & main beam is OK again. 

Looks as if S/L relay is suspect but why does it work the main beam OK. Also checked fuse 27 right at the start of this problem & is OK.

Today removed S/L pump/compressor & fed 12volts to it direct as advised by Rob G  -  all works fine  - so not pump either.

Not too good with wiring diagrams but thought about trying find which 2 wires from the rear mounted switch if touched together would operate the compressor  - if this is a possibility ?

Any help greatly appriciated          Regards, Al

Could have fried the ECU as it`s in-built inside sensor box.
What colour and how many wires you got at sensor plug?

8 wires Rob   .... Colours ? will have to go and have a look    give me 15 mins

Same on male & female?

[Big_Al]

Right .   8 wires on switch side of connector ( female)  but only 6 wires on compresser side of connector (male)

6 colours on male compressor side are  : Brown      Red        yellow      white        Blue/Red         Brown /White.

Do you need the  colours from the switch side

sorry to be a total PITA

[Big_Al]

Right .   8 wires on switch side of connector ( female)  but only 6 wires on compresser side of connector (male)

6 colours on male compressor side are  : Brown      Red        yellow      white        Blue/Red         Brown /White.

Do you need the  colours from the switch side

sorry to be a total PITA

right update :

Switch side connector has male pins inside  has 8 wires   black  white/blue   white    green      red    white/red    blue    white/green

compressor side connector has female sockets  & has 6 wires    Brown   red   yellow   White   Blue/Red   Brown /White

sorry for the confusion 

[RobG]

How many "pins", 4? What wires are in the female pins

[Big_Al]

How many "pins", 4? What wires are in the female pins

Sorry rob  I'm being a right muppet trying to explain this to you   .i'll try again

From the level sensor/switch  there is a short wiring loom to a block connector. this has 8 male pins inside arranged in 2 rows . 8 wires go to this colours are : Black   white/Blue   White    green    on one side  &   Red   white/Red  Blue  White/Green on the other.

the other half of the connecting block which the switch male pin one connects to has 8 female sockets inside . again in two rows of 4.

colours are : brown     red     yellow     white      blue/red       brown /white   


do you need to know which colours connect to each other & which 2 are not used ?

If so will have to jack up car & get under to see clearly . but can do it later today.

thanks again       Al 

[RobG]

Think this is a task for Kevin Wood. I`ve looked at wiring diags and can`t make out eight wires

[Big_Al]

Think this is a task for Kevin Wood. I`ve looked at wiring diags and can`t make out eight wires

Wrong level sensor switch maybe ?     


I'll see what other feedback we get .  may go down the route of just using std  shocks & do away with S/L

[al brown]

Hi Al, I had the same on mine where the exhaust blew and melted the plug. First I knew was the relay was constantly clicking on and off. Chasing that was when I found a hole in the exhaust and that it had melted the plug. Turned out the shorted wires had indeed fried the switch although the relay was still OK. I got the wiring diag off Kevin Wood, will forward it if I can find it. I had to used a switch from a later car (mine is a pfl) so I didnt need the extra wires for the ABS/TC. Took me a bit of checking to get the correct wires as I was sure it was the switch but couldnt just plug a new one in. I checked the output of the level switch with a multi-meter as best I could ( I am no electrician) from the picture from Kevin and worked out from that that the switch wasn't giving continuity when it should. Again, if I can find the results from the old and new switch I will forward them to help you check yours. I know I kept them, just not sure where. It will be tomorrow but I will swap my 2 relays over as I am sure they are the same and check if my lights work with the s/l relay. You may have ruined both, but I only paid £20 for a s/h sensor so not too bad.
Good luck,   Al

[Big_Al]

Hi Al, I had the same on mine where the exhaust blew and melted the plug. First I knew was the relay was constantly clicking on and off. Chasing that was when I found a hole in the exhaust and that it had melted the plug. Turned out the shorted wires had indeed fried the switch although the relay was still OK. I got the wiring diag off Kevin Wood, will forward it if I can find it. I had to used a switch from a later car (mine is a pfl) so I didnt need the extra wires for the ABS/TC. Took me a bit of checking to get the correct wires as I was sure it was the switch but couldnt just plug a new one in. I checked the output of the level switch with a multi-meter as best I could ( I am no electrician) from the picture from Kevin and worked out from that that the switch wasn't giving continuity when it should. Again, if I can find the results from the old and new switch I will forward them to help you check yours. I know I kept them, just not sure where. It will be tomorrow but I will swap my 2 relays over as I am sure they are the same and check if my lights work with the s/l relay. You may have ruined both, but I only paid £20 for a s/h sensor so not too bad.
Good luck,   Al

Thanks for that Al   will check out your PM . Looks like another sensor & relay then.  Am enquiring at the moment of how many wires & what colours are fitted to MFL sensor switches . Been under the back of the car this morning ( in between doing cam cover gaskets  ) and now have a detailed sketch of wiring colours and what colours connect to what . turns out there are 8 wires on the sensor plug going into only 7 on the main loom connector . Yesterday I said 6 on that one but it is clearly 7.

Making some progress now    thanks to all who have responded