DTC B27A4: Open in Rear Door Electrical Antenna Circuit, Front Passengers Side (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 rear door outside handle assembly RH (for rear door RH).

   OK

   Connectors are properly connected.

Result:  NG

NG 

CONNECT CONNECTORS PROPERLY 

Result:  OK

OK 

See step  2

1. Disconnect the A36 and Q1 certification ECU (smart key ECU assembly) connectors.
2. Disconnect the N8 rear door outside handle assembly RH (for rear door RH) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Q1-3 (CLG4) - N8-6 (ANT1)	Always	Below 1 Ω
   Q1-4 (CG4B) - N8-3 (ANT2)	Always	Below 1 Ω
   A36-11 (E) - Body ground	Always	Below 1 Ω
   N8-2 (GND) - Body ground	Always	Below 1 Ω
   Q1-3 (CLG4) or N8-6 (ANT1) - Body ground	Always	10 kΩ or higher
   Q1-4 (CG4B) or N8-3 (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 Q1 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 N8 rear door outside handle assembly RH (for rear door RH) connector.
3. Using an oscilloscope, check the waveform.

   OK

   Tester Connection	Condition	Tool Setting	Specified Condition
   Q1-3 (CLG4) - 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)
   Q1-3 (CLG4) - 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)
   Q1-4 (CG4B) - 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 rear door outside handle assembly RH (for rear door RH) 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 B27A4 is not output.

Result:  OK

OK 

END (REAR DOOR OUTSIDE HANDLE ASSEMBLY RH (FOR REAR DOOR RH) WAS DEFECTIVE) 

Result:  NG

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

(Refer to REMOVAL (07/2015 -) )