Dtc B27A8 Open In Outside Luggage Compartment Electrical Key Antenna Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CONNECTOR CONNECTION

CHECK HARNESS AND CONNECTOR (ELECTRICAL KEY ANTENNA - CERTIFICATION ECU)

INSPECT ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE)

REPLACE CERTIFICATION ECU

CHECK FOR DTC

DTC B27A8 Open in Outside Luggage Compartment Electrical Key Antenna Circuit


DESCRIPTION

The certification ECU generates a request signal and transmits the signal to the electrical key antenna (outside luggage). The electrical key antenna (outside luggage) detects that the electrical key is brought close to the vehicle, and when a request signal is received from within 1.0 m (3.28 ft.) of the back door, the signal is transmitted. DTC B27A8 is stored by the certification ECU when an open circuit is detected in the circuit between the certification ECU and electrical key antenna (outside luggage) (CLG8 - CLG5, CG8B - CLGB).

DTC Code
DTC Detection Condition
Trouble Area
B27A8
An open circuit is detected in the circuit between the certification ECU and electrical key antenna (outside luggage) (CLG8 - CLG5, CG8B - CLGB).
  1. Harness or connector
  2. Electrical key antenna (outside luggage)
  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 B27A8 Open In Outside Luggage Compartment Electrical Key Antenna 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 electrical key antenna (outside luggage).

    OK:
    Connectors are properly connected.


NG
CONNECT CONNECTORS PROPERLY
OK


2.CHECK HARNESS AND CONNECTOR (ELECTRICAL KEY ANTENNA - CERTIFICATION ECU)

  1. Disconnect the R16 antenna connector.

  1. Disconnect the G39 ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    R16-1 (CLG5) - G39-19 (CLG8)
    		Always
    		Below 1 Ω
    R16-2 (CLGB) - G39-20 (CG8B)
    		Always
    		Below 1 Ω
    G39-19 (CLG8) - Body ground
    		Always
    		10 kΩ or higher
    G39-20 (CG8B) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE)
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 B27A8 Open In Outside Luggage Compartment Electrical Key Antenna Circuit

  1. Remove the outside electrical key antenna (outside luggage) (LandCruiser RM000002QFS049X.html).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 (CLG5) - 2 (CLGB)
    		Always
    		Below 1 Ω


NG
REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE) (LandCruiser RM000002QFS049X.html)
OK


4.REPLACE CERTIFICATION ECU

  1. Temporarily replace the certification ECU with a new one (Refer to the Service Bulletin).


NEXT


5.CHECK FOR DTC

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

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

    OK:
    DTC B27A8 is not output.


NG
REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE) (LandCruiser RM000002QFS049X.html)
OK

END (CERTIFICATION ECU IS DEFECTIVE)