SEAT Workshop Service and Repair Manuals > Leon Mk2 > Heating, ventilation, air conditioning system | Supplementary heating | Aux. heater/heater booster | Auxiliary heater -D5S- F / -B5S- F, vehicles 05.2004?? | Start sequence | Pin assignment for 4-pin connector on heater unit (harness end)

Pin assignment for 4-pin connector on heater unit (harness end)

1 -	Circulation pump -V55- signal +

2 -

Vacant

3 -	Circulation pump -V55- from onboard power supply +

4 -	Circulation pump -V55- from onboard power supply -

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