Heater contactor output not connected (open load).
▶ How to fix
Check harness between BMU6 and heater.
What you'll see
No driver-visible symptom recorded.
System reaction
No heating of the battery. If the battery temperature is below 5ºC the hybrid system power is reduced until temperature increased above 5ºC .
Diagnostic depth
Detection
Open load on PWM output to heater.
Possible cause
Harness failure