der Lock Sensor sitzt im Kompressor. Das Relais dafuer sitzt beim E32 hinter dem Lautsprecher Fahrerseite Fussraum.
Einfach am Kompressor bruecken, ich kopiere was ich auf Bimmerboard geschrieben habe:
the compressor of the E32 750 and the E31 850 has 3 wire connections and 2 of them go to the lower side of the compressor to the lock sensor = Hall-speed sensor = pulse sender.
The sensor is for the supervision of the RPM of the compressor, in case the RPM deviates by more than 30% from the RPM of the engine, the compressor will be switch off. Reason is that in case the compressor seizes it would damage the belt which on the 750 and 850 also drives the water pump. Therefore in the older version of the compressor there is this safety function to disconnect the compressor in such a case.
Newer compressors (at least on the E31 850 as I understand)
do not have this lock sensor anymore and the compressors have only one connection instead of 3. Therefore also a new lock sensor control module is required.
In case of a compressor without lock sensor the following can be made according to E32Fan from Canada which is an electronic engineer and also owns an E32:
quote
Details are on pg 6450-22 & 23 at
http://www.e38.org/e32/e32_88_etm.pdf
I would open the A26 Lock Sensor Control Unit and solder a jumper wire across the Normally Open relay contacts. This will short X80 pin 3 to X77 pin 1 (shorting SW/RT/GE to SW/GR).
If there are no pulses from the reed relay in the compressor (because the new compressor has no reed relay) then A26 will de-energize its relay, but we won't care because the contacts are now shorted.
This will allow the compressor to run whenever K19 is energized and the pressure switches B7 and B8 are closed (just as in 735iL)
In later years, A26 was modified. The connector became X9968 which is not documented in the connector Views 8500. See 6450-22 at
http://www.e38.org/e32/e32_92_etm.pdf
I do not see any outputs from A26 that will bother EML, so I would not expect any problems from shorting the A26 relay. The SW/GR wire to EML is just the compressor run signal to inform EML that there is a compressor load.
unquote
Apparently also the EML gets a signal from the lock sensor, see pin 44, and pin 41 is for the aircon relay
Steckerbelegung/pinout
Pin 1 EML Pedalwertgeber/EML throttle poti
Pin 2 EML Pedalwertgeber/EML throttle poti
Pin 3 frei/ free
Pin 4 ABS/ASC/ASC+T Steuergerät/control unit
Pin 5 DME Steuergerät 1 / Motronic cylinder row 1
Pin 6 EML Pedalwertgeber / DME Steuergerät 1
Pin 7 EML Pedalwertgeber/pedal poti
Pin 8 Instrumentenkombi/instrument cluster
Pin 9 EML Pedalwertgeber/pedal poti
Pin 10 EML Stellmotor 2/EML adjusting motor 2
Pin 11 EML Stellmotor 2
Pin 12 EML Stellmotor 1
Pin 13 RXD Datenleitung / data line
Pin 14 Masse
Pin 15 EML Leuchte Instrumentenkombi/ EML light instrument cluster
Pin 16 EML Stellmotor 2
Pin 17 EML Stellmotor 1
Pin 18 Hauptrelais 2/ main relay 1
Pin 19 Masse / ground
Pin 20 EGS Steuergerät / transmission control module
Pin 21 frei / free
Pin 22 Steuergerät ABS/ASC/ASC+T control module
Pin 23 Steuergerät ABS/ASC/ASC+T control module
Pin 24 frei / free
Pin 25 frei / free
Pin 26 EML Stellmotor 1
Pin 27 EML Stellmotor 1
Pin 28 EML Stellmotor 2
Pin 29 frei / free
Pin 30 Masse / ground
Pin 31 Kühlwassertemperaturfühler/ coolant water temperature
Pin 32 EML Pedalwertgeber/DME Steuergerät 2
Pin 33 DME Steuergerät 2
Pin 34 EML Stellmotor 2
Pin 35 EML Stellmotor 1
Pin 36 Hauptrelais 2 main relay 2
Pin 37 Hauptrelais 2 main relay 2
Pin 38 EML Stellmotor 1
Pin 39 frei / free
Pin 40 EML Stellmotor 2
Pin 41 Klimaanlagenrelais / climate control relay
Pin 42 Getriebewählschalter/transmission selector switch
Pin 43 Schalter Geschwindigkeitsregelung/switch speed regulation
Pin 44 Steuergerät Lock Sensor
Pin 45 Kühlwassertemperaturfühler / coolant water temperature feeler
Pin 46 EML Pedalwertgeber
Pin 47 DME Steuergerät 1
Pin 48 frei / free
Pin 49 DME Steuergerät 1
Pin 50 DME Steuergerät 2
Pin 51 frei
Pin 52 EGS Steuergerät / control module
Pin 53 ABS/ASC/ASC+T Steuergerät
Pin 54 frei / free
Pin 55 TXD Datenleitung/ data line
additional info from E32 Fan:
This diagram shows where the Jumper needs to be soldered. If you remove the module cover and plug it into the sockets, you can trace the BLK/RED/YEL and BLK/GRY wires and see that they lead to the relay contacts.
http://s1011.photobucket.com/albums/...=BMWJUMPER.jpg
Der originale Kompressor hat drei Kabelanschlüsse. Ein schwarzes Kabel für die Ansteuerung der Magnetkupplung und 2 weitere Kabel ( blau und blau/braun ) für einen Drehzahlmesser am Gehäuse des originalen Kompressors. Es wird lediglich das schwarze Kabel mit dem Kompressor verbunden. Das blaue und blau/braune Kabel wird miteinander verbunden.
complete thread
http://www.7-forum.com/forum/5/klima...or-160392.html