2009 Lexus LS 460 AWDFACTORY OEM SERVICE PROCEDURE

Diagnostic Trouble Code Chart

HINT:

  • If a trouble code is displayed during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the "DTC Code" below.
  • Inspect the fuses and relays related to this system before inspecting the trouble areas below.

    ELECTRIC POWER CONTROL ECU [Electric Power Control] 

    ELECTRIC POWER CONTROL ECU REFERENCE CHART

    DTC Code Detection Item Trouble Area
    B22A0  IG2 Terminal Circuit Low
    • P IG2 fuse
    • P-J/B fuse
    • Engine room No. 2 junction block, relay block
    • Passenger side junction block (Electric power control ECU)
    • Wire harness
    B22A1  Battery Current Sensor
    • Battery current sensor
    • Passenger side junction block (Electric power control ECU)
    • Wire harness
    B22A6  THB Terminal Voltage Low
    • Battery current sensor
    • Passenger side junction block (Electric power control ECU)
    • Wire harness
    B22A8  VB Terminal Voltage
    • VSSR fuse
    • Passenger side junction block (Electric power control ECU)
    • Wire harness
    B22AB  Open in Starter Switch Terminal
    • Passenger side junction block (Electric power control ECU)
    • Wire harness
    B22AC  Alternater Stop Power Generation
    • Generator
    • SFI system
    B22AD  No Control for Power Generation of Alternator
    • Generator
    • SFI system
    B22AE  Open in Alternater Charge Line
    • Generator
    • Wire harness
    B22B2  Power Cut Relay On Stuck
    • P-D/C CUT fuse
    • Passenger side junction block (Electric power control ECU)
    • Wire harness
    B22B3  Power Cut Relay Off Stuck
    • P-D/C CUT fuse
    • Passenger side junction block (Electric power control ECU)
    • Wire harness
    B22B6  Communication Error with ECM/PCM "A" (Generate Voltage Data of Alternator)
    • CAN communication system
    • ECM
    B22B7  Communication Error with ECM/PCM "A" (Generate Rate Data of Alternator)
    • CAN communication system
    • ECM
    B22B8  Communication Error with ECM/PCM "A" (Charge Mode Data)
    • CAN communication system
    • ECM
    B22BA  Communication Error with ECM/PCM "A" (Engine Speed Data)
    • CAN communication system
    • ECM
    B22BB  Communication Error with Brake System Control Module (Vehicle Speed Data)
    • CAN communication system
    • Skid control ECU
    B22BC  Communication Error with ECM/PCM "A" (Intake-Air Temperature Data)
    • CAN communication system
    • ECM
    B22BD  Communication Error with ECM/PCM "A" (Coolant Temperature Data)
    • CAN communication system
    • ECM
    U0100  Lost Communication with ECM/ PCM "A"
    • CAN communication system
    • Passenger side junction block (Electric power control ECU)
    U0129  Lost Communication with Brake System Control Module
    • CAN communication system
    • Passenger side junction block (Electric power control ECU)
    U0131  Lost Communication with Power Steering Control Module
    • CAN communication system
    • Passenger side junction block (Electric power control ECU)
    U0142  Lost Communication with Gateway "A"
    • CAN communication system
    • Passenger side junction block (Electric power control ECU)
    U0164  Lost Communication with HVAC Control Module
    • CAN communication system
    • Passenger side junction block (Electric power control ECU)
    U1104  Lost Communication with Driving Support ECU
    • CAN communication system
    • Passenger side junction block (Electric power control ECU)
    U1111  Lost Communication with Front Controller Module
    • CAN communication system
    • Passenger side junction block (Electric power control ECU)
Factory Service Tools

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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.