B27A1

THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function): B27A1: Open in Driver Side Electrical Antenna Circuit
B27A1 - Open in Driver Side Electrical Antenna Circuit

DESCRIPTION

The certification ECU (smart key ECU assembly) generates a request signal and sends it to the door electrical key oscillator built into the front door outside handle assembly (for driver side) at 0.25-second intervals. To detect a key near the driver door, the front door outside handle assembly (for driver side) creates a detection area with a radius of approximately 1.0 m (3.28 ft.) from the driver door at 0.25-second intervals.

DTC B27A1 is detected by the certification ECU (smart key ECU assembly) if an open circuit is detected between the certification ECU (smart key ECU assembly) and front door outside handle assembly (for driver side) terminals (between CLG1 and ANT1, or CG1B and ANT2).





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
The smart access system with push-button start (for entry function) uses a LIN communication system and 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 system is functioning properly.

PROCEDURE

1. CHECK CONNECTOR (CONNECTOR CONNECTION CONDITION)

(a) Turn the power switch off.

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

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)

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

(b) Disconnect the front door outside handle assembly (for driver side) 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 HARNESS AND CONNECTOR (FRONT DOOR OUTSIDE HANDLE - BODY GROUND)

(a) 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.

4. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (INDOOR ELECTRICAL KEY OSCILLATOR SIGNAL OUTPUT)

(a) Reconnect the certification ECU (smart key ECU assembly) connector.





(b) Measure the resistance and check for pulses according to the value(s) in the table below.

Standard Resistance:





Standard:





Text in Illustration





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

5. REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY (for Driver Side)

(a) Replace the front door outside handle assembly (for driver side) Removal.

NEXT -- Continue to next step.

6. CHECK DTC OUTPUT

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

(b) Recheck for DTCs.

OK:

DTC B27A1 is not output.

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

OK -- END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY WAS DEFECTIVE)