| Pin | Type | Description / Signal type | Connection /
Measuring notes |
|---|
| 1 | E | Voltage supply, terminal 15 | Fuse F20 |
| | | |
| 2 | | Not used | |
| | | |
| 3 | E/A | K-bus signal line | K-bus connector |
| | | |
| 4 | E | Signal, switch off consumer load | Connector, switch off consumer load |
| | | |
| 5 | A | Left water valve activation | Water valves |
| | | |
| 6 | | Not used | |
| | | |
| 7 | A | Relay activation | Rear defogger relay |
| | | |
| 8 | A | Signal Heated windscreen washer jets | Connector, heated washer jets |
| | | |
| 9 | A | Auxiliary water pump activation with independent heating Auxiliary water pump activation with latent heat accumulator | Auxiliary water pump with independent heating Connector, auxiliary water pump with latent heat accumulator |
| | | |
| 10 | E | Pressure signal | High pressure switch |
| | | |
| 11 | | Not used | |
| | | |
| 12 | | Not used | |
| | | |
| 13 | | Not used | |
| | | |
| 14 | | Not used | |
| | | |
| 15 | A | Air conditioning system standby signal | DDE control unit |
| | | |
| 16 | A | Signal, A/C compressor ON (M51) | DDE control unit |
| | | |
| 17 | A | Signal, A/C compressor OFF (M51) A/C compressor signal | DDE control unit Digital diesel electronics control unit DME control unit |
| | | |
| 18 | E | Relay activation, auxiliary fan stage I | Connector, auxiliary fan stage 1 |
| | | |
| 19 | | Not used | |
| | | |
| 20 | M | Ground High pressure switch | High pressure switch |
| | | |
| 21 | A | Supply High pressure switch | High pressure switch |
| | | |
| 22 | | Not used | |
| | | |
| 23 | E | Night light signal | Connector, terminal 58g |
| | | |
| 24 | | Not used | |
| | | |
| 25 | | Not used | |
| | | |
| 26 | | Not used | |
| | | |
| Pin | Type | Description / Signal type | Connection /
Measuring notes |
|---|
| 1 | A | Relay activation Relay for latent heat accumulator | Relay for latent heat accumulator |
| | | |
| 2 | A | Signal, independent heating ON Valve activation Changeover valve LWS | Independent heating relay Solenoid valve independent heating/ventilation II Changeover valve LWS |
| | | |
| 3 | A | Independent heating ON feedback | Independent park/auxiliary heating |
| | | |
| 4 | A | Sensor signal | NTC resistor, steering angle sensor |
| | | |
| 5 | M | Sensor ground | NTC resistor, steering angle sensor |
| | | |
| 6 | A | Valve activation Shut-off valve LWS | Shut-off valve LWS |
| | | |