DTC B27A8-13: Outside Luggage Compartment (Back Door) Electrical key Antenna Circuit Open [10/2023 - ]: 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 L285 certification ECU (smart key ECU assembly) connector.
2. Disconnect the L51 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
   L285-4 (CLG8) - L51-2 (ANTE8)	Always	Below 1 Ω
   L285-3 (CG8B) - L51-1 (CLGB)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

   Post-procedure1

4. Reconnect the L285 certification ECU (smart key ECU assembly) connector.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Using an oscilloscope, check the waveform.

   OK

   Tester Connection	Condition	Tool Setting	Specified Condition
   L285-4 (CLG8) - G212-29 (E)	Procedure: Ignition switch off Electrical key transmitter sub-assembly brought outside vehicle All doors closed Luggage electrical key switch off → on	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform 1)
   L285-3 (CG8B) - G212-29 (E)	Procedure: Ignition switch off Electrical key transmitter sub-assembly brought outside vehicle All doors closed Luggage electrical key switch off → on	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform 2)

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT). Refer to  REMOVAL [10/2023 - ] 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2023 - ]