Dtc B27A7: Open In Inside Luggage Compartment Electrical Key Oscillator Circuit [04/2013 - ]: Procedure

1. Check That The Connectors Are Properly Connected To The Certification Ecu (Smart Key Ecu Assembly) And No. 1 Indoor Electrical Key Antenna Assembly (Inside Luggage).

   Ok

   Connectors Are Properly Connected.

   Result

   Proceed To
   Ok
   Ng

Result: 

Ng 

Connect Connectors Properly 

Result: 

Ok 

See Step  2

1. Disconnect The K5 And K6 Certification Ecu (Smart Key Ecu Assembly) Connectors.
2. Disconnect The Q3 No. 1 Indoor Electrical Key Antenna Assembly (Inside Luggage) Connector.
3. Measure The Resistance According To The Value(S) In The Table Below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K5-4 (Clg7) - Q3-1 (Ante7)	Always	Below 1 Ω
   K5-3 (Cg7B) - Q3-3 (Clgb)	Always	Below 1 Ω
   K6-11 (E) - Body Ground	Always	Below 1 Ω
   K5-4 (Clg7) Or Q3-1 (Ante7) - Body Ground	Always	10 KΩ Or Higher
   K5-3 (Cg7B) Or Q3-3 (Clgb) - Body Ground	Always	10 KΩ Or Higher

4. Reconnect The K5 And K6 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
   K5-4 (Clg7) - K6-11 (E)	Procedure: Door Is Closed Engine Switch Off Electrical Key Transmitter Sub-Assembly Not Inside Vehicle Driver Door Lock Sensor Touched	2 V/Div., 500 Ms/Div.	Pulse Generation (See Waveform 1)
   K5-3 (Cg7B) - K6-11 (E)	Procedure: Door Is Closed Engine Switch Off Electrical Key Transmitter Sub-Assembly Not Inside Vehicle Driver Door Lock Sensor Touched	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 [04/2013 - 08/2015]  , or refer to  Removal [08/2015 - 09/2020]  , or refer to  Removal [09/2020 - ] 

Result: 

Ok 

See Step  4

1. Temporarily Replace The No. 1 Indoor Electrical Key Antenna Assembly (Inside Luggage) With A New One.

   Refer To Removal [04/2013 - ]

   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 B27A7 Is Not Output.

   Result

   Proceed To
   Ok
   Ng

Result: 

Ok 

End (No. 1 Indoor Electrical Key Antenna Assembly (Inside Luggage) Was Defective) 

Result: 

Ng 

Replace Certification Ecu (Smart Key Ecu Assembly). Refer To  Removal [04/2013 - 08/2015]  , or refer to  Removal [08/2015 - 09/2020]  , or refer to  Removal [09/2020 - ]