可能是折腾HUD把CANBUS烧了

reasons:

1. high current on all devices, these devices all share the same bus, so it is very likely that the CAN bus is damaged which resulted in excessive current drain.

2. when you pull fuse for each device, the ground is not isolated so the device with damaged CAN buffer/driver can still drain current

3. the dash cluster was dark for a brief period, this fits the typical symptom of semiconductor thermal or ESD breakdown.

4. the audio unit wants to calibrate upon power up, which means that it is not able to communicate with ECU through CAN bus.

to confirm CAN bus damage:

disconnect the battery, measure the CAN bus resistance to ground from OBD port, according to specs the resistance should be around 100ohms

to isolate the damaged device:

pull off wiring harness from each suspected device and measure CAN bus resistance

 

所有跟帖： 

• 很可能， 要是CAN BUS 烧了自己能换吗？不换行吗？ -kodak- ♂ (163 bytes) () 11/29/2015 postreply 14:03:09

• 你得先找出哪里坏了才能说换的事 -方宜- ♂ (422 bytes) () 11/29/2015 postreply 14:52:53

• 先试着找那个部件坏了，估计也就是一个芯片或者三级管的问题。 -BeyondWind- ♂ (0 bytes) () 11/29/2015 postreply 15:23:45