Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2009 Lexus LS 460 AWDFACTORY OEM SERVICE PROCEDURE
Power Source/Wiring
- Electric Power Control System
- Precaution
- Parts Location
- System Diagram
- System Description
- How To Proceed With Troubleshooting
- Operation Check
- Problem Symptoms Table
- Terminals Of Ecu
- DTC Check/Clear
- Data List/Active Test
- Diagnostic Trouble Code Chart
- DTC B22A0 IG2 Terminal Circuit Low
- DTC B22A1 Battery Current Sensor
- DTC B22A6 THB Terminal Voltage Low
- DTC B22A8 VB Terminal Voltage
- DTC B22AB Open in Starter Switch Terminal
- DTC B22AC Alternater Stop Power Generation; DTC B22AD No Control for Power Generation of Alternator
- DTC B22AE Open in Alternater Charge Line
- DTC B22B2 Power Cut Relay On Stuck; DTC B22B3 Power Cut Relay Off Stuck
- DTC B22B6 Communication Error with ECM/PCM "A" (Generate Voltage Data of Alternator); DTC B22B7 Communication Error with ECM/PCM "A" (Generate Rate Data of Alternator); DTC B22B8 Communication Error with ECM/PCM "A" (Charge Mode Data); DTC B22BA Communication Error with ECM/PCM "A" (Engine Speed Data); DTC B22BC Communication Error with ECM/PCM "A" (Intake-Air Temperature Data); DTC B22BD Communication Error with ECM/PCM "A" (Coolant Temperature Data)
- DTC B22BB Communication Error with Brake System Control Module (Vehicle Speed Data)
- DTC U0100 Lost Communication with ECM/PCM "A"; DTC U0129 Lost Communication with Brake System Control Module; DTC U0131 Lost Communication with Power Steering Control Module; DTC U0142 Lost Communication with Gateway "A"; DTC U0164 Lost Communication with HVAC Control Module; DTC U1104 Lost Communication with Driving Support ECU; DTC U1111 Lost Communication with Front Controller Module
- Battery Current Sensor
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.