Coolant heater contactor supply short circuit to ground
â–¶ How to fix
• Measure on the heater H32 between H32-1 and ground. If there is contact, change the heater H32 • Disconnect E81-C and measure on the cable between E81-C10 and ground. If there is contact, change the cable • Change the BMU(E81)
What you'll see
No driver-visible symptom recorded.
System reaction
Forced cooling of battery, heating not possible. If ambient temperature is low, hybrid battery may never reach operation temperature which leads to reduced system performance.
Diagnostic depth
Detection
Electrical diagnosis in the BMU
Possible cause
Component or cable harness damage