LBT-471 Electrical Anomalies


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  • Auto Service Experts – Platinum / Standard
  • Auto Value, Bumper to Bumper, and Confidence Plus Certified Service Centers
  • Federated Car Care Center
  • Parts Plus Car Care Center – Platinum / Standard
  • Pronto Auto Service Center – Platinum / Standard
  • EuroPro Car Care Centers – Platinum / Standard


This course, “ Electrical Anomalies,” is a look at EV/HEV/PHEV anomalies; electrical issues that deviate from what is normal and expected.  The purpose of this program is to give professional technicians technical explanations on various electrical anomalies they may encounter on HEV, PHEV, and BEV vehicles.

You will see some of the unique challenges related to troubleshooting modern electric and hybrid vehicle voltage systems. This course examines electrical systems and some of the mysteries behind HV connections,  leakage, and the HV system main contactor relays. This course also covers overlooked essential subjects such as motor current draw, A/C circuits, ohmmeter false positives in parasitic drains, measuring interlock relay outputs, and trouble codes associated with common problems.


  • High Voltage Interlock Circuits (HVIL)
  • Diagnosing HV System Interlock Circuits (P0A0D)
  • HVIL Circuits – Vary with OEMs / Models
  • Live-Dead-Live High Voltage Verifications (Jeep 4XE)
  • 2021 Jeep Wrangler Limited “4XE” Power Down & Test
  • BMW I-3 HV Power Down Low Voltage Plug

Course Objectives:

  • Identify common anomalies on EV/HEV and PHEVs, and determine if it is normal or a reason for concern.
  • Describe the use of isolation circuits used on EV/HEV and PHEVs
  • Locate and identify high voltage interlock (HVIL) circuits
  • Diagnose trouble codes related to HVIL circuits
  • Describe intermittent relay fault indications and causes
  • Identify different types of HVIL connectors
  • Describe safety procedures necessary for properly servicing HV battery vehicles
  • Compare the power down procedures used on different vehicles & manufacturers

Runtime = 55 minutes
Credit Hours = 1.5


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