DTC B27A7: Open in Inside Luggage Compartment Electrical Key Oscillator Circuit [10/2014 - ]: Procedure

1. Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and No. 3 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 I52 and I53 certification ECU (smart key ECU assembly) connectors.
2. Disconnect the P15 No. 3 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
   I52-4 (CLG7) - P15-1 (ANTE7)	Always	Below 1 Ω
   I52-3 (CG7B) - P15-3 (CLGB)	Always	Below 1 Ω
   I53-11 (E) - Body ground	Always	Below 1 Ω
   I52-4 (CLG7) or P15-1 (ANTE7) - Body ground	Always	10 kΩ or higher
   I52-3 (CG7B) or P15-3 (CLGB) - Body ground	Always	10 kΩ or higher

4. Reconnect the I52 and I53 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
   I52-4 (CLG7) - I53-11 (E)	Procedure: Engine 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)
   I52-3 (CG7B) - I53-11 (E)	Procedure: Engine 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 [10/2014 - ] 

Result: 

OK 

See step  4

1. Temporarily replace the No. 3 indoor electrical key antenna assembly (inside luggage) with a new one.

   Refer to REMOVAL [10/2014 - ]

   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. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE) WAS DEFECTIVE) 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2014 - ]