Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Lexus >> 2021 >> LS 500h RWD >> Repair and Diagnosis >> Electrical >> Body Electrical >> Power Integration System - Diagnostics - Introduction >> Power Integration System >> Problem Symptoms Table [10/2017 - 10/2020] >> Problem Symptoms Table [10/2017 - 10/2020]

Problem Symptoms Table [10/2017 - 10/2020]

HINT: 

Use the table below to help determine the cause of the problem symptom. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU

Symptom Suspected Area Link
Headlights do not illuminate Lighting system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 09/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020]
Heater does not operate Air conditioning system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 10/2023]
Air conditioning system does not operate Air conditioning system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 10/2023]
SEMICONDUCTOR POWER INTEGRATION ECU (W/ PTC HEATER)

Symptom Suspected Area Link
PTC heater does not operate Air conditioning system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 10/2023]
NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU

Symptom Suspected Area Link
Stop lights does not illuminate (for Mono Camera Type) Lighting system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 09/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020]
Electronically controlled brake system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 10/2020]
Dynamic radar cruise control system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 09/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020]
Pre-collision system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 09/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020]
Stop lights does not illuminate (for Stereo Camera Type) Lighting system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 09/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020]
Electronically controlled brake system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 10/2020]
Dynamic radar cruise control system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 10/2020]
Pre-collision system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 09/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020]
Rear taillights does not illuminate Lighting system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 09/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020]
Back-up light does not illuminate Lighting system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 09/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020]
Electronic shift lever system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 10/2023]
Rear defogger does not operate Window defogger system Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 10/2023]