Volkswagen Heater

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VW heater.jpg

General Information [1]

  • Operating Voltage: 280VDC - 450VDC
  • Power: 5kW (7kW "boost" between 350-450V)
  • Control via LIN by integrated electronics
  • Temperature control by integrated sensor
  • 3d Scan: https://grabcad.com/


Pinout/Connectors

VW heater connectors (annotated).jpg


HV connector: TE 4-2103177-5 (HVA 280 series - key "E")

  • HV+ near to the body,
  • HV- far from the body


LV connector: TE 1-1394416-1

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



LIN Bus Communication

Control and Answer Messages from/to Heater[2]
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 Enhanced Power

0-100%

scale: x1

Last bit: Start/Stop
Dec: 48

Hex: 0x30

PID: 0xF0

Feedback 8 Enhanced HV Current:

Unit: Amp Scale: 0.25

?? ?? ?? LV Voltage:

Unit: Volt Scale: 0.1

Module Temp

Unit: Celcius offset:-50

Temperature in

Unit: Celsius offset:-50

Temperature out

Unit: Celsius offset:-50

VW Part Numbers

Heater:

  • 3Q0 963 231 A
  • 3Q0 963 231 C
  • 3Q0 963 231 E


Cable assemblies:

  • HV cable is 3Q0 971 475 or 5Q0 971 475
  • LV cable appears to be 1J0 973 714

References