1. Introduction
1.1 What is HVIL?
High voltage interlock loop (HVIL) is a safety feature which protects people during the assembly, repair. maintenance and operation of a car. It is loop/circuit which will not allow the contactors to close when high-voltage connections becomes loose, disconnected or damaged. It also helps to protect driver and passengers in the event of accident.
If the resistance changes, and the Voltage drop higher or lower than the maximum thresholds, BMS reports an HVIL alert.
If Car is Standby
BMS_f008_HW_HVIL
If car is standby, support, or Charge mode. The alert is reported as Fault. Car opens the contactors or keeps them open.
If Car is in Drive mode
BMS_w008_HW_HVIL
If car is in Drive. The alert is reported as Warning. Car does not open contactors to prevent loss of drive.
Please have a look on guide. Link
High Voltage Components
PTC Heater
Please check more details about PTC Heater Repair in another guide. Link
A/C Compressor
HV Battery
HV Junction Box
One of reason could be connection in Front Junction Box
Action to do - check all the connections on and in the front junction box
Rapid Splitter
Rapid Splitter connects to Battery, Charger Module, Rear Motor Inverter and Front Junction Box.
Drive Unit
Please check more details about Drive Unit in another guide. Link
DC/DC
Coolant Heater
Isolation Procedure
Isolation procedure guide. Link
Code
Possible alert Code
- BMS_f036
- BMS_w036
- BMS_f008
- BMS_w008
