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HOMESERVICE MANUALSLEXUS2010RX 450H 3.5 BREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEDOOR LOCKSSMART ACCESS SYSTEM (KEYLESS ENTRY) (DIAGNOSTIC CODES & SYMPTOM TESTS)SMART ACCESS SYSTEM WITH PUSH-BUTTON START (FOR ENTRY FUNCTION)DTC B27A2: OPEN IN FRONT PASSENGER SIDE ELECTRICAL ANTENNA CIRCUIT (FROM 8/2009)PROCEDURE
2010 Lexus RX 450h 3.5 B

DTC B27A2: Open in Front Passenger Side Electrical Antenna Circuit (From 8/2009): Procedure

2010 Lexus RX 450h 3.5 BSECTION Procedure
  1. CHECK CONNECTOR CONNECTION CONDITION 
    1. Turn the power switch off.
    2. Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and the front door outside handle assembly (for front passenger side).

      OK

      Connectors are properly connected.

    NG → CONNECT CONNECTORS PROPERLY 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - FRONT DOOR OUTSIDE HANDLE) 
    1. Disconnect the certification ECU (smart key ECU assembly) connector.
    2. Disconnect the front door outside handle assembly (for front passenger side) connector.
      Fig 1: Identifying F58 Certification ECU & M1 Front Door Outside Handle (For Front Passenger Side) Connector Terminals
      GTY276947Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F58-5 (CLG2) - M1-6 (ANT1) Always Below 1 Ω
      F58-6 (CG2B) - M1-3 (ANT2) Always Below 1 Ω
      F58-5 (CLG2) - Body ground Always 10 kΩ or higher
      F58-6 (CG2B) - Body ground Always 10 kΩ or higher
      M1-6 (ANT1) - Body ground Always 10 kΩ or higher
      M1-3 (ANT2) - Body ground Always 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Certification ECU (Smart Key ECU Assembly))
      *2 Front view of wire harness connector
      (to Front Door Outside Handle Assembly (for Front Passenger Side))

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (FRONT DOOR OUTSIDE HANDLE - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 2: M1 Front Door Outside Handle Assembly (For Front Passenger Side) Body Ground Terminal
      GTY282249Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      M1-2 (GND) - Body ground Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Front Door Outside Handle Assembly (for Front Passenger Side))

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (DOOR ELECTRICAL KEY OSCILLATOR SIGNAL OUTPUT) 
    1. Reconnect the certification ECU (smart key ECU assembly) connector.
      Fig 3: Identifying F58 Certification ECU (Smart Key ECU Assembly) Door Electrical Key Oscillator Signal Output
      GTY266757Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance and check for pulses according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F58-15 (E) - Body ground Always Below 1 Ω

      Standard

      Tester Connection Condition Specified Condition
      F58-5 (CLG2) - F58-15 (E)
      • Power switch off
      • All doors closed
      • Key not in cabin
      		 No pulse generation
      F58-5 (CLG2) - F58-15 (E)
      • Power switch off
      • All doors closed
      • Key not in cabin
      • All doors locked by wireless lock function
      		 Pulse generation
      F58-6 (CG2B) - F58-15 (E)
      • Power switch off
      • All doors closed
      • Key not in cabin
      		 No pulse generation
      F58-6 (CG2B) - F58-15 (E)
      • Power switch off
      • All doors closed
      • Key not in cabin
      • All doors locked by wireless lock function
      		 Pulse generation
      TEXT IN ILLUSTRATION

      *1 Component with harness connected
      (Certification ECU (Smart Key ECU Assembly))

    NG → See step   7 

    OK: Go to next step 

  5. REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY (for Front Passenger Side) 
    1. Replace the front door outside handle assembly (for front passenger side). Refer to REMOVAL .

    NEXT: Go to next step 

  6. CHECK DTC OUTPUT 
    1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
    2. Recheck for DTCs.

      OK

      DTC B27A2 is not output.

    NG → See step   7 

    OK → END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY WAS DEFECTIVE) 

  7. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL 
RENDER: 1.0x

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