MG PTC Cabin Air Heater: Difference between revisions

Latest revision as of 18:27, 27 February 2026

PTC Air heater assembly found in MG EVs (ZS, MG4, MG5).

Heater is controlled by LIN.

Dimensions are WxLxD 160 x 220 x 33mm for the active part with the control box adding another 30mm in length.


MG Part Number	Vehicles Used it	Tested?
10606761	ZS	No

no timers, counters or CRC are needed, but there is a delay of about 3 seconds until settings are applied
Bytes 2E and 2F contain the control messages, 3A has the responses
Control is in byte 0+1 of 0x2E Scaling = x25 Little endian So if you want 20% power you need to send decimal 500 which is hex 01F4 So then Byte 0 = 0xF4 and Byte 1 = 0x01 Byte 4 looks to be on/off with 0x96 = ON and 0x00 = Off but it does not fully turn off. I kept seeing a current draw on the bench power supply of 0,07A at 300V. When requesting power 0% this does drop to 0A.
Feedback Message 0x3A Byte 5 and 6 contain the actual consumption in W as little endian. So if Byte 5 = CF and Byte 6 = 04 that is 04CF in hex which is 1,2 kW.
Below about 250V it stops working. Then 0x3A sends 00 00 00 08 00 00 00 20
Above 150 degrees it stops working. Then 0x3A sends 00 00 00 00 01 00 00 20

KET part number MG644145-5

Hyundai part number 1879002605as


Pin	Cross Section	Colour	Function
2	0.35	Green/White	+ fused with 5A
3	0.35	Pink/Black	LIN
4	0.35	Black	GND

Pin	Cross Section	Colour	Function
1	3.00	Orange	HV+ fused with 40A
2	3.00	Orange	HV-

@@ Line 20: / Line 20: @@
 |No
 |}
+==LIN Control==
+* no timers, counters or CRC are needed, but there is a '''delay of about 3 seconds''' until settings are applied
+* Bytes 2E and 2F contain the control messages, 3A has the responses
+*Control is in byte 0+1 of 0x2E Scaling = x25 Little endian So if you want 20% power you need to send decimal 500 which is hex 01F4 So then Byte 0 = 0xF4 and Byte 1 = 0x01 Byte 4 looks to be on/off with 0x96 = ON and 0x00 = Off but it does not fully turn off. I kept seeing a current draw on the bench power supply of 0,07A at 300V. When requesting power 0% this does drop to 0A.
+*Feedback Message 0x3A Byte 5 and 6 contain the actual consumption in W as little endian. So if Byte 5 = CF and Byte 6 = 04 that is 04CF in hex which is 1,2 kW.
+*Below about 250V it stops working. Then 0x3A sends 00 00 00 08 00 00 00 20
+*Above 150 degrees it stops working. Then 0x3A sends 00 00 00 00 01 00 00 20
 ==Connectors==
@@ Line 25: / Line 34: @@
 === Low Voltage/Control ===
-Unidentified - see image
+KET part number MG644145-5
+Hyundai part number 1879002605as
 ==== Pinout ====