Dtc B27A5 Open In Front Floor Electrical Key Oscillator Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CONNECTOR CONNECTION

CHECK HARNESS AND CONNECTOR (INDOOR NO. 1 ELECTRICAL KEY ANTENNA - CERTIFICATION ECU)

CHECK CERTIFICATION ECU

REPLACE INDOOR NO. 1 ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR)

CHECK FOR DTC

DTC B27A5 Open in Front Floor Electrical Key Oscillator Circuit


DESCRIPTION

The certification ECU generates a request signal and transmits the signal to the indoor No. 1 electrical key antenna (front floor). The indoor No. 1 electrical key antenna (front floor) detects that the electrical key is inside the vehicle and transmits the request signal received from the certification ECU. DTC B27A5 is stored by the certification ECU when an open circuit is detected in the circuit between the certification ECU and indoor No. 1 electrical key antenna (front floor) (CLG5 - CLG3, CG5B - CLGB).

DTC Code
DTC Detection Condition
Trouble Area
B27A5
An open circuit is detected in the circuit between the certification ECU and indoor No. 1 electrical key antenna (front floor) (CLG5 - CLG3, CG5B - CLGB).
  1. Harness or connector
  2. Indoor No. 1 electrical key antenna (front floor)
  3. Certification ECU

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B27A5 Open In Front Floor Electrical Key Oscillator Circuit


INSPECTION PROCEDURE

NOTICE:
  1. The entry and start system (for Entry Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting (LandCruiser RM000000XU70G9X.html). Troubleshoot the entry and start system (for Entry Function) after confirming that the communication systems are functioning properly.
  2. When using the intelligent tester with the engine switch off to troubleshoot: Connect the intelligent tester to the DLC3 and turn a courtesy light switch on and off at 1.5-second intervals until communication between the intelligent tester and vehicle begins.
  3. Before replacing the certification ECU, refer to the Service Bulletin.
1.CHECK CONNECTOR CONNECTION

  1. Turn the engine switch off.

  1. Check that the connectors are properly connected to the certification ECU and indoor No. 1 electrical key antenna (front floor).

    OK:
    Connectors are properly connected.


NG
CONNECT CONNECTORS PROPERLY
OK


2.CHECK HARNESS AND CONNECTOR (INDOOR NO. 1 ELECTRICAL KEY ANTENNA - CERTIFICATION ECU)

  1. Disconnect the i1 antenna connector.

  1. Disconnect the G38 ECU connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    i1-1 (CLG3) - G38-7 (CLG5)
    		Always
    		Below 1 Ω
    i1-3 (CLGB) - G38-8 (CG5B)
    		Always
    		Below 1 Ω
    G38-7 (CLG5) - Body ground
    		Always
    		10 kΩ or higher
    G38-8 (CG5B) - Body ground
    		Always
    		10 kΩ or higher
    G38-15 (E) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK CERTIFICATION ECU


  1. Measure the voltage according to the value(s) in the table below.


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B27A5 Open In Front Floor Electrical Key Oscillator Circuit


    Text in Illustration
    *a
    		Component with harness connected
    (Certification ECU)
    		-
    		-
    OK:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G38-7 (CLG5) - G38-15 (E)
    		Engine switch off, all doors closed, key not in cabin and lock sensor off → on
    		No pulse generation → Pulse generation
    G38-8 (CG5B) - G38-15 (E)
    		Engine switch off, all doors closed, key not in cabin and lock sensor off → on
    		No pulse generation → Pulse generation


NG
REPLACE CERTIFICATION ECU
OK


4.REPLACE INDOOR NO. 1 ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR)

  1. Temporarily replace the indoor No. 1 electrical key antenna (front floor) with a new or normally functioning one (LandCruiser RM000002QFO04WX.html).


NEXT


5.CHECK FOR DTC

  1. Clear the DTCs (LandCruiser RM000002BZF06SX.html).

  1. Check for DTCs (LandCruiser RM000002BZF06SX.html).

    OK:
    DTC B27A5 is not output.


NG
REPLACE CERTIFICATION ECU
OK

END (INDOOR NO. 1 ELECTRICAL KEY ANTENNA ASSEMBLY IS DEFECTIVE)