DTC B27A8-13: Outside Luggage Compartment (Back Door) Electrical key Antenna Circuit Open [11/2023 - ]: Procedure

1. Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and electrical key antenna (outside luggage compartment).

   OK

   Connectors are properly connected.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CONNECT CONNECTORS PROPERLY 

Result: 

OK 

See step  2

Pre-procedure1

1. Disconnect the M106 certification ECU (smart key ECU assembly) connector.
2. Disconnect the M6 electrical key antenna (outside luggage compartment) connector.

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   M106-4 (CLG8) - M6-2 (ANTE8)	Always	Below 1 Ω
   M106-3 (CG8B) - M6-1 (CLGB)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

   Post-procedure1

4. Connect the M106 certification ECU (smart key ECU assembly) connector.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Using an oscilloscope, check the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Certification ECU (Smart Key ECU Assembly))	*b	Waveform 1
   *c	Waveform 2	-	-

   OK

   Tester Connection	Condition	Tool Setting	Specified Condition
   M106-4 (CLG8) - H138-29 (E)	Procedure: Ignition switch off Electrical key transmitter sub-assembly brought outside vehicle All doors closed Back door opener switch assembly off → on	5 V/DIV., 50 ms./DIV.	Pulse generation (See waveform 1)
   M106-3 (CG8B) - H138-29 (E)	Procedure: Ignition switch off Electrical key transmitter sub-assembly brought outside vehicle All doors closed Back door opener switch assembly off → on	5 V/DIV., 50 ms./DIV.	Pulse generation (See waveform 2)

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT). Refer to  REMOVAL [12/2019 - ] 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [11/2023 - ]