Search found 5 matches

by jagheterfredrik
Fri Mar 28, 2025 10:40 am
Forum: VW (VAG, Volkswagen, Audi, Porsche etc.)
Topic: Battery preheating on ID.4 / MEB
Replies: 6
Views: 4691

Re: Battery preheating on ID.4 / MEB

I assembled a LIN responder that emulates the heater and the values I send match what the OBD reports. Unfortunately the BMS does not turn on the circulation pump, even with emulated current draw and big temperature deltas :(
by jagheterfredrik
Thu Mar 27, 2025 3:47 pm
Forum: VW (VAG, Volkswagen, Audi, Porsche etc.)
Topic: Battery preheating on ID.4 / MEB
Replies: 6
Views: 4691

Re: Battery preheating on ID.4 / MEB

Ok, I had to go to a DC fast charger to get the car to actually heat the battery.

ID 15:
Example while heating: 34 BE 00 00 86 4C 3D 42
Byte 1: Current (0.25*X in amps)
Byte 2: HV battery voltage (2*X in volt)
Byte 3,4: Status? Always 0
Byte 5: LV battery voltage (0.1*X in volt)
Byte 6, 7, 8: Temp ...
by jagheterfredrik
Wed Mar 26, 2025 8:54 am
Forum: VW (VAG, Volkswagen, Audi, Porsche etc.)
Topic: Battery preheating on ID.4 / MEB
Replies: 6
Views: 4691

Re: Battery preheating on ID.4 / MEB

I tried getting the car to heat the battery but CAN readouts show 0 amp draw from the PTC battery heater.
ID 28 haven't changed but ID 15 did interesting stuff when connected while first booting up the car.

The first recorded value of ID 15 was 0,189,0,0,135,58,54,55
The fifth byte (135) value ...
by jagheterfredrik
Tue Mar 25, 2025 3:41 pm
Forum: VW (VAG, Volkswagen, Audi, Porsche etc.)
Topic: Battery preheating on ID.4 / MEB
Replies: 6
Views: 4691

Re: Battery preheating on ID.4 / MEB

I've built a harness, I thought the battery heater was the one documented in the Wiki but it wasn't. It seems the ID.4 heater (1EE.963.231) is built by BorgWarner and has a slightly different LIN bus communication scheme.

Every 50ms a PID is polled, alternating between:
ID 15 (0x0F): 8 bytes, in my ...
by jagheterfredrik
Sat Mar 15, 2025 12:29 pm
Forum: VW (VAG, Volkswagen, Audi, Porsche etc.)
Topic: Battery preheating on ID.4 / MEB
Replies: 6
Views: 4691

Battery preheating on ID.4 / MEB

Hello,

I’m looking into fixing battery preheating on my 2022 ID.4 and this forum is packed with great information.

My current thinking is to man-in-the-middle the LIN bus to the Z132 HV battery heater and turn it on for a X time. More info at https://github.com/jagheterfredrik/meb-preheat ...