Volkswagen Heater

General Information

• 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/
• Must be used in an inverted orientation with the sockets situated below as air can be left trapped in the heater element zone causing steam to be explosively generated

Dimensions

• Fluid connection (mm): 20 (Nozzle dimensions according to DIN3021-3)
• Dimensions L x W x H (mm): 210 x 73 x175
• Weight (kg): ~1,7
  

Pinout/Connectors

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
• Pin 5 is HV Interlock loop passthrough (ref. right terminal highlighted with Blue in picture)
• Pin 7 is HV interlock loop passthrough (ref. left terminal highlighted with Blue in picture)

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	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