B27A2

THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function): B27A2: Open in Front Passenger Side Electrical Antenna Circuit
B27A2 - Open in Front Passenger Side Electrical Antenna Circuit

DESCRIPTION

The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the front door outside handle assembly RH (front passenger side electrical key antenna) at intervals of 250 ms. For the front door outside handle assembly RH (front passenger side electrical key antenna) to detect when the electrical key transmitter is brought close to the vehicle, a signal requesting a response from the electrical key transmitter is transmitted within approximately 1 m (3.28 ft.) of the front passenger side door at intervals of 250 ms. DTC B27A2 is stored by the certification ECU (smart key ECU assembly) when an open circuit is detected between the certification ECU (smart key ECU assembly) and front door outside handle assembly RH (front passenger side electrical key antenna) (between terminals CLG2 and ANT1, or terminals CG2B and ANT2).





* *: Only output while a malfunction is present.

Vehicle Condition and Fail-safe Operation when Malfunction Detected





Related Data List and Active Test





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 intervals of 1.5 seconds until communication between the Techstream and vehicle begins.
* Before replacing the certification ECU (smart key ECU assembly), refer to the smart key system (for Entry Function) Smart Key System (for Entry Function).
* After performing repairs, confirm that the DTC does not reoccur by performing the "DTC Output Confirmation Operation".
* The front door outside handle assembly RH has an antenna coil between the ANT1 and ANT2 terminals.

PROCEDURE

1. CHECK CONNECTOR CONNECTION

(a) Turn the engine switch off.

(b) Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and front door outside handle assembly RH.

OK:

Connectors are properly connected.

NG -- CONNECT CONNECTORS PROPERLY
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - FRONT DOOR OUTSIDE HANDLE RH AND BODY GROUND)

(a) Disconnect the C35 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the F1 front door outside handle assembly RH 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. CHECK CERTIFICATION ECU (OUTPUT TO FRONT PASSENGER SIDE ELECTRICAL KEY ANTENNA)

(a) Connect the C35 certification ECU (smart key ECU assembly) connector.





Text in Illustration





(b) Connect the F1 front door outside handle assembly RH connector.

(c) Using an oscilloscope, check the waveform.

OK:












*1: For details about the areas that are inside the entry function detection area, refer to Operation Check Operation Check.

*2: For details about the areas that are outside the entry function detection area, refer to Operation Check Operation Check.

NG -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal
OK -- Continue to next step.

4. REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY RH

(a) Temporarily replace the front door outside handle assembly RH with a new or normally functioning one Disassembly.

NEXT -- Continue to next step.

5. CLEAR DTC

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

NEXT -- Continue to next step.

6. CHECK FOR DTC

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

OK:

DTC B27A2 is not output.

NG -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal

OK -- END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY RH IS DEFECTIVE)