DTC B27A8: Open in Outside Luggage Compartment Electrical Key Antenna Circuit [09/2015 - ]: 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

1. Disconnect the R1 and J41 certification ECU (smart key ECU assembly) connectors.
2. Disconnect the W1 electrical key antenna (outside luggage compartment) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   R1-13 (CLG8) - W1-2 (ANTE8)	Always	Below 1 Ω
   R1-12 (CG8B) - W1-1 (CLGB)	Always	Below 1 Ω
   J41-18 (E) - Body ground	Always	Below 1 Ω
   R1-13 (CLG8) or W1-2 (ANTE8) - Body ground	Always	10 kΩ or higher
   R1-12 (CG8B) or W1-1 (CLGB) - Body ground	Always	10 kΩ or higher

4. Reconnect the R1 and J41 certification ECU (smart key ECU assembly) connectors.

   Result

   Proceed to
   OK
   NG

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
   R1-13 (CLG8) - J41-18 (E)	Procedure: Engine switch off Electrical key transmitter sub-assembly brought outside vehicle All doors closed Back door opener switch assembly off → on	2 V/DIV., 500 ms/DIV.	Pulse generation (See waveform 1)
   R1-12 (CG8B) - J41-18 (E)	Procedure: Engine switch off Electrical key transmitter sub-assembly brought outside vehicle All doors closed Back door opener switch assembly off → on	2 V/DIV., 500 ms/DIV.	Pulse generation (See waveform 1)

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [09/2015 - 08/2016]  , or refer to  REMOVAL [08/2016 - 08/2019]  , or refer to  REMOVAL [08/2019 - ] 

Result: 

OK 

See step  4

1. Temporarily replace the electrical key antenna (outside luggage compartment) with a new or known good one.

   Refer to REMOVAL [09/2015 - 08/2016] , or refer to REMOVAL [08/2016 - 12/2017] , or refer to REMOVAL [12/2017 - 08/2019] , or refer to REMOVAL [08/2019 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Clear the DTCs.

   Body Electrical > Smart Access > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

1. Check for DTCs.

   Body Electrical > Smart Access > Trouble Codes 

   OK

   DTC B27A8 is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT) WAS DEFECTIVE) 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [09/2015 - 08/2016]  , or refer to  REMOVAL [08/2016 - 08/2019]  , or refer to  REMOVAL [08/2019 - ]