B27A8

THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (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). 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).





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* The smart key 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 How To Proceed With Troubleshooting. Troubleshoot the smart key system (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 engine immobiliser system (w/ Smart Key System) Engine Immobilizer System (w/ Smart Key System).

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 N21 antenna connector.

(b) Disconnect the F78 ECU 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 outside 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. CHECK FOR DTC

(a) Clear the DTCs Smart Key System (for Entry Function).

(b) Check for DTCs Smart Key System (for Entry Function).

OK:

DTC B27A8 is not output.

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

OK -- END (CERTIFICATION ECU IS DEFECTIVE)