DTC B27A1: Open in Driver Side Electrical Antenna Circuit (07/2015 -): Procedure

1. Turn the engine switch off.
2. Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and front door outside handle assembly LH (for driver door).

   OK

   Connectors are properly connected.

Result:  NG

NG 

CONNECT CONNECTORS PROPERLY 

Result:  OK

OK 

See step  2

1. Disconnect the A36 and H56 certification ECU (smart key ECU assembly) connectors.
2. Disconnect the M11 front door outside handle assembly LH (for driver door) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H56-12 (CLG1) - M11-6 (ANT1)	Always	Below 1 Ω
   H56-13 (CG1B) - M11-3 (ANT2)	Always	Below 1 Ω
   A36-11 (E) - Body ground	Always	Below 1 Ω
   M11-2 (GND) - Body ground	Always	Below 1 Ω
   H56-12 (CLG1) or M11-6 (ANT1) - Body ground	Always	10 kΩ or higher
   H56-13 (CG1B) or M11-3 (ANT2) - Body ground	Always	10 kΩ or higher

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  OK

OK 

See step  3

1. Connect the A36 and H56 certification ECU (smart key ECU assembly) connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *1	Waveform 1	*2	Waveform 2
   *a	Component with harness connected (Certification ECU (smart key ECU assembly)	-	-

2. Connect the M11 front door outside handle assembly LH (for driver door) connector.
3. Using an oscilloscope, check the waveform.

   OK

   Tester Connection	Condition	Tool Setting	Specified Condition
   H56-12 (CLG1) - A36-11 (E)	Procedure: Engine switch off Electrical key transmitter sub-assembly brought outside vehicle All doors closed Electrical key transmitter sub-assembly not inside vehicle Electrical key transmitter sub-assembly brought inside detection area*1 All doors locked through wireless operation	2 V/DIV., 500 ms/DIV.	Pulse generation (See waveform 1)
   H56-12 (CLG1) - A36-11 (E)	Procedure: Engine switch off Electrical key transmitter sub-assembly brought outside vehicle All doors closed Electrical key transmitter sub-assembly not inside vehicle Electrical key transmitter sub-assembly brought outside detection area*2 All doors locked through wireless operation	2 V/DIV., 500 ms/DIV.	Pulse generation (See waveform 2)
   H56-13 (CG1B) - A36-11 (E)	Procedure: Engine switch off Electrical key transmitter sub-assembly brought outside vehicle All doors closed Electrical key transmitter sub-assembly not inside vehicle All doors locked through wireless operation	2 V/DIV., 500 ms/DIV.	Pulse generation (See waveform 2)

   • *1: For details about the areas that are inside the entry function detection area, refer to Operation Check (Refer to OPERATION CHECK (07/2015 -) ).
   • *2: For details about the areas that are outside the entry function detection area, refer to Operation Check (Refer to OPERATION CHECK (07/2015 -) ).

Result:  NG

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

(Refer to REMOVAL (07/2015 -) )

Result:  OK

OK 

See step  4

1. Temporarily replace the front door outside handle assembly LH (for driver door) with a new or known good one (Refer to DISASSEMBLY (07/2015 -) ).

Result:  NEXT

NEXT 

See step  5

1. Clear the DTCs (Refer to DTC CHECK / CLEAR (07/2015 -) ).

Result:  NEXT

NEXT 

See step  6

1. Check for DTCs (Refer to DTC CHECK / CLEAR (07/2015 -) ).

   OK

   DTC B27A1 is not output.

Result:  OK

OK 

END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY LH (FOR DRIVER DOOR) WAS DEFECTIVE) 

Result:  NG

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

(Refer to REMOVAL (07/2015 -) )