Webasto HVH50
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The Webasto HVH series are electrical water heaters typically used in popular PHEV.
Connectors
The HV connector is a Tyco HVA280 connector with A-key (might be different on other devices).
The small center pins are for interlock (detect that the connector is seated). The right pin (with tab facing upwards) is HV+, the left one HV-
The LV connector is best found by the VW part number 1J0973714
Pin 1 is permanent 12V
Pin 2 is an analog output
Pin3 is an analog or PWM input
Pin 5 and 7 are interlock (probably must be shorted)
Pin 6 is LIN
Pin 4 and 8 are unused