| Pin | Type | Description/Function | Connection
|
| 1 | E | Left footwell temperature | Left footwell sensor
|
| 2 | E | Right footwell temperature | Right footwell sensor
|
| 3 | E | Right heat exchanger temperature | Right heat exchanger sensor
|
| 4 | E | Outside temperature | Outside temperature sensor
|
| 5 | E | Terminal 15 | Fuse
|
| 6 | M | Ground | Ground connection
|
| 7 | E | Signal, rear window defogger ON | Rear window defogger switch
|
| 8 | A | Signal, rear window defogger ON | Rear window defogger relay
|
| 9 | A | Function light, rear window defogger | Rear window defogger switch
|
| 10 | E | Left heat exchanger temperature | Left heat exchanger sensor
|
| 11 | A | Activation, right water valve | Right water valve
|
| 12 | A | Signal, auxiliary water pump | Relay, auxiliary water pump
|
| 13 | E | Lights, terminal 58 g | Dimmer
|
| 14 | M | Ground | Ground connection
|
| 15 | A | Activation, left water valve | Left water valve
|
| 16 | E | Tacho/speed signal | DME control unit/DDE control unit
|
| 17 | M | 518i/t, 520i/t: not used 525td/t, 525tds/t: Ground | Ground connection
|
| 18 | | not used |
|
