| Number | X-number of pins | Description |
|---|---|---|
| X18341 | 3 | Heating and A/C control module Connector 0 |
| X610 | 26 | Heating and A/C control module Connector 3 |
| X611 | 18 | Heating and A/C control module Connector 4 |
| X18153 | 3 | Heating and A/C control module Connector 5 |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | A | Magnetic clutch voltage supply | High pressure switch |
| 2 | E | Terminal 30 voltage supply | Fuse F11 |
| 3 | M | Ground | Ground point |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | E | Voltage supply, terminal 15 | Fuse F20 |
| Battery voltage | |||
| 2 | E | Compressor ON signal from engine control module (DME) | Engine control module (DME)DDE control module |
| 3 | A | A/C compressor signal to engine control module (DME) | Engine control module (DME)DDE control module |
| 4 | A | A/C standby signal to engine control module (DME) | Engine control module (DME) 728i,730i, 735i, 740iDDE control module 725tds |
| A/C splice 750i | |||
| 5 | A | Rear window defogger relay control | Rear defogger relay |
| 6 | A | Front defogger/washer jets relay control | Front defogger/washer jets relay |
| 7 | Not used | ||
| 8 | A | up to 08/1995 Not used as of 09/1995 Blower control voltage | Final stage unit |
| 9 | Not used | ||
| 10 | Not used | ||
| 11 | Not used | ||
| 12 | E | Consumer cut-off signal | 83Y57Y83Y46Y83Y6cY83Y89Y83Y8bY83Y82Y83Y57Y83Y85Y81Y5bY83Y8b |
| 13 | Not used | ||
| 14 | A | Auxiliary water pump control | Auxiliary water pump |
| 15 | A | Blower relay control | Blower relay |
| 16 | Not used | ||
| 17 | A | Auxiliary fan normal speed relay control | Auxiliary fan normal speed relay |
| 18 | E | Nighttime illumination signal | Light module |
| 19 | E/A | K-bus signal line | K-bus splice |
| 20 | A | Left water valve control | Water valve assembly, Left valve |
| 21 | A | Right water valve control | Water valve assembly, Right valve |
| 22 | Not used | ||
| 23 | Not used | ||
| 24 | Not used | ||
| 25 | Not used | ||
| 26 | Not used | ||
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | A | Actuating signal | Fresh air flap motor |
| 2 | A | Actuating signal | Fresh air flap motor |
| 3 | A | Actuating signal | Fresh air flap motor |
| 4 | A | Actuating signal | Fresh air flap motor |
| 5 | Not used | ||
| 6 | Not used | ||
| 7 | Not used | ||
| 8 | Not used | ||
| 9 | Not used | ||
| 10 | A | Actuating signal | Right ventilation flap motor |
| 11 | A | Actuating signal | Right ventilation flap motor |
| 12 | A | Actuating signal | Right ventilation flap motor |
| 13 | A | Actuating signal | Right ventilation flap motor |
| 14 | M | Component ground | Sensor |
| 15 | E | Sensor signal | Evaporator temperature sensor |
| 16 | E | Sensor signal | RH heat exchanger temperature sensor |
| 17 | E | Sensor signal | LH heat exchanger temperature sensor |
| 18 | E | Switch-off signal | Motor limit switch |
| Pin | Type | Description / Signal type | Connection / Measuring notes |
|---|---|---|---|
| 1 | A | Park heating ON signal | up to 08/1995 Park heating/ventilation control module as of 09/1995 Receiver, independent heating |
| 2 | A | Control voltage | Park heating relay |
| 3 | E | Park heating ON feedback signal | Park heating/ventilation control module |