Volkswagen Heater

General Information

Operating Voltage and Conditions

280VDC...450VDC

Pinout

HV connector HVA 280 KEY_E from TE

• +HV near to the body,

• -HV far from the body

LV Connector 1J0973714

• Pin 1 is permanent 12V
• Pin 2 is GND
• Pin 4 is LIN

LIN Bus Communication

Control and Answer Messages from/to Heater

ID	Description	Length	Checksum Type	Byte 0	Byte 1	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7
Dec: 28 Hex: 0x1C PID: 0x9C	Control, every 50ms	2	??	Power 0-2530W scale: x10	Last bit: Start/Stop
Dec: 48 Hex: 0x30 PID: 0xF0	Feedback	8	??	Power: 13 = 770W 26 = 1540W	??	??	??	??	??	Temperature in	Temperature out

Part Numbers

VW heater P/N are:

• 3Q0963231A
• 3Q0963231C
• 3Q0963231E

HV cable P/N is 3Q0971475 or 5Q0971475.

LV connector looks like it is Webasto 1J0973714 8P type.