DTC    B27A1    Open in Driver Side Electrical Antenna Circuit

for Preparation Click here


DESCRIPTION

The certification ECU generates a request signal and transmits the signal to the front door outside handle assembly (for driver side) at an interval of 250 ms. The front door outside handle assembly (for driver side) detects when 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 driver door, the signal is transmitted at the frequency stated above. DTC B27A1 is stored by the certification ECU when an open is detected in the terminals between the certification ECU and the front door outside handle assembly (for driver side) (CLG1 - ANT1, CG1B - ANT2).

DTC Code
DTC Detection Condition
Trouble Area
B27A1
Open is detected in the terminals between the certification ECU and the front door outside handle assembly (driver side) (CLG1 - ANT1, CG1B - ANT2).
  1. Wire harness or connector
  2. Front door outside handle assembly (for driver side)
  3. Certification ECU

WIRING DIAGRAM


B216377E01


INSPECTION PROCEDURE

NOTICE:
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 tester and vehicle begins

1.CHECK CONNECTOR CONNECTION CONDITION

  1. Turn the engine switch off.

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

    OK:
    Connectors are properly connected.



NG
CONNECT CONNECTORS PROPERLY
OK


2.CHECK HARNESS AND CONNECTOR (OUTSIDE DOOR HANDLE ASSEMBLY - CERTIFICATION ECU)
B199545E03

  1. Disconnect the certification ECU connector.

  1. Disconnect the front door outside handle assembly (for driver side) connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    R1-3 (ANT2) - D34-4 (CG1B)*1
    		Always
    		Below 1 Ω
    Q1-3 (ANT2) - D34-4 (CG1B)*2
    		Always
    		Below 1 Ω
    R1-6 (ANT1) - D34-3 (CLG1)*1
    		Always
    		Below 1 Ω
    Q1-6 (ANT1) - D34-3 (CLG1)*2
    		Always
    		Below 1 Ω
    R1-2 (GND) - Body ground*1
    		Always
    		Below 1 Ω
    Q1-2 (GND) - Body ground*2
    		Always
    		Below 1 Ω
    D34-4 (CG1B) - Body ground
    		Always
    		10 kΩ or higher
    D34-3 (CLG1) - Body ground
    		Always
    		10 kΩ or higher

    1. *1: for LHD
    2. *2: for RHD

Text in Illustration 
*1
Front view of wire harness connector
(to Front Door Outside Handle assembly)
*2
Front view of wire harness connector
(to Certification ECU)
*3
for LHD
*4
for RHD


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT CERTIFICATION ECU
B215215E01

  1. Reconnect the certification ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D34-15 (E) - Body ground
    		Always
    		Below 1 Ω

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

    OK:
    Tester Connection
    		Condition
    		Specified Condition
    D34-3 (CLG1) - D34-15 (E)
    		Engine switch off, all doors closed, and key not in the cabin
    		No pulse generation
    D34-3 (CLG1) - D34-15 (E)
    		Engine switch off, all doors closed, all door locked with wireless door lock control, and key not in the cabin
    		Pulse generation
    D34-4 (CG1B) - D34-15 (E)
    		Engine switch off, all doors closed, and key not in the cabin
    		No pulse generation
    D34-4 (CG1B) - D34-15 (E)
    		Engine switch off, all doors closed, all door locked with wireless door lock control, and key not in the cabin
    		Pulse generation

    Text in Illustration 
    *1
    		Component with harness connected
    (Certification ECU)



NG
REPLACE CERTIFICATION ECU
OK


4.REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER SIDE)

  1. Temporarily replace the front door outside handle assembly (for driver side) with a new or normally functioning one (Click here).


NEXT


5.CHECK DTC OUTPUT

  1. Clear the DTCs (Click here).

  1. Recheck for DTCs (Click here).

    OK:
    B27A1 output does not recur.



NG
REPLACE CERTIFICATION ECU
OK

END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY IS DEFECTIVE)