DTC B27A7: Open in Inside Luggage Compartment Electrical Key Oscillator Circuit [06/2015 - ]: Procedure

1. Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and indoor electrical key oscillator (for 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 G39 and G41 certification ECU (smart key ECU assembly) connectors.
2. Disconnect the Q17 indoor electrical key oscillator (for luggage compartment) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G39-4 (CLG7) - Q17-1 (ANTE7)	Always	Below 1 Ω
   G39-3 (CG7B) - Q17-3 (CLGB)	Always	Below 1 Ω
   G41-11 (E) - Body ground	Always	Below 1 Ω
   G39-4 (CLG7) or Q17-1 (ANTE7) - Body ground	Always	10 kΩ or higher
   G39-3 (CG7B) or Q17-3 (CLGB) - Body ground	Always	10 kΩ or higher

4. Reconnect the G39 and G41 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
   G39-4 (CLG7) - G41-11 (E)	Procedure: Power switch off Electrical key transmitter sub-assembly not inside vehicle Within 30 seconds of closing any door using the door outside handle	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform 1)
   G39-3 (CG7B) - G41-11 (E)	Procedure: Power switch off Electrical key transmitter sub-assembly not inside vehicle Within 30 seconds of closing any door using the door outside handle	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 [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

Result: 

OK 

See step  4

1. Temporarily replace the indoor electrical key oscillator (for luggage compartment) with a new one.

   Refer to REMOVAL [06/2015 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Clear the DTCs.

   Body Electrical > Smart Key > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

1. Check for DTCs.

   Body Electrical > Smart Key > Trouble Codes 

   OK

   DTC B27A7 is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (INDOOR ELECTRICAL KEY OSCILLATOR (FOR LUGGAGE COMPARTMENT) WAS DEFECTIVE) 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ]