B27A8

THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function): B27A8: Open in Outside Luggage Compartment Electrical Key Antenna Circuit
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). For the electrical key antenna (outside luggage) to detect when the key is brought close to the vehicle, the received request signal is transmitted within approximately 1.0 m (3.28 ft.) of the back door. DTC B27A8 is stored by the certification ECU when an open circuit is detected between the certification ECU and electrical key antenna (outside luggage) (between terminals CLG8 and CLG5, or terminals CG8B and CLGB).





* *: Only output while a malfunction is present and the engine switch on is (IG)

Vehicle Condition and Fail-safe Operation when Malfunction Detected





Related Data List and Active Test





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* The smart access system with push-button start (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 How To Proceed With Troubleshooting. Troubleshoot the smart access system with push-button start (for Entry Function) after confirming that the communication systems are functioning properly.
* When using the Techstream with the engine switch off to troubleshoot:
* Connect the Techstream to the DLC3 and turn a courtesy light switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.
* Before replacing the certification ECU, refer to the smart access system with push-button start (for Entry Function) Smart Access System With Push-Button Start (for Entry Function).
* After repair, confirm DTC not reoccur with performing the "DTC Output Confirmation Operation".
* Electrical key antenna (outside luggage) has an antenna coil between LCG5 and CLGB terminals.
PROCEDURE

1. CHECK CONNECTOR CONNECTION

(a) Turn the engine switch off.

(b) 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 -- Continue to next step.

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

(a) Disconnect the G27 certification ECU connector.

(b) Disconnect the R19 electrical key antenna (outside luggage) connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. INSPECT ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE)

(a) Remove the electrical key antenna (outside luggage) Removal.





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

Standard Resistance:





NG -- REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE) Removal
OK -- Continue to next step.

4. REPLACE CERTIFICATION ECU

(a) Temporarily replace the certification ECU with a new one Removal.

NEXT -- Continue to next step.

5. CLEAR DTC

(a) Clear the DTCs Smart Access System With Push-Button Start (for Entry Function).

NEXT -- Continue to next step.

6. CHECK FOR DTC

(a) Check for DTCs Smart Access System With Push-Button Start (for Entry Function).

OK:

DTC B27A8 is not output.

NG -- REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE) Removal

OK -- END (CERTIFICATION ECU IS DEFECTIVE)