DTC B27A5: Open in Front Floor Electrical Key Oscillator Circuit [12/2012 - ]: Procedure

1. Turn the engine switch off.
2. Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and No. 1 indoor electrical key antenna assembly (front floor).

   OK

   Connectors are properly connected.

   Result	Proceed to
   	OK
   	NG

Result: 

NG 

CONNECT CONNECTORS PROPERLY 

Result: 

OK 

See step  2

1. Disconnect the G82 and G84 certification ECU (smart key ECU assembly) connectors.
2. Disconnect the G45 No. 1 indoor electrical key antenna assembly (front floor) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G84-3 (CLG5) - G45-1 (ANTE5)	Always	Below 1 Ω
   G84-2 (CG5B) - G45-3 (CLGB)	Always	Below 1 Ω
   G82-11 (E) - Body ground	Always	Below 1 Ω
   G84-3 (CLG5) or G45-1 (ANTE5) - Body ground	Always	10 kΩ or higher
   G84-2 (CG5B) or G45-3 (CLGB) - Body ground	Always	10 kΩ or higher

   Result	Proceed to
   	OK
   	NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Connect the G82 and G84 certification ECU (smart key ECU assembly) connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Certification ECU [Smart Key ECU Assembly])	*b	Waveform
   *c	Within approximately 30 seconds from when the door is closed	*d	After approximately 30 seconds from when the door is closed

2. Connect the G45 No. 1 indoor electrical key antenna assembly (front floor) connector.
3. Using an oscilloscope, check the waveform.

   OK

   Tester Connection	Switch Condition	Tool Setting	Specified Condition
   G84-3 (CLG5) - G82-11 (E)	Procedure:  Engine switch off Electrical key transmitter sub-assembly not inside vehicle Door is open Door is closed Within 30 seconds	2 V/DIV., 500 ms/DIV.	Pulse generation (See waveform)
   G84-2 (CG5B) - G82-11 (E)	Procedure:  Engine switch off Electrical key transmitter sub-assembly not inside vehicle Door is open Door is closed Within 30 seconds	2 V/DIV., 500 ms/DIV.	Pulse generation (See waveform)

   Result	Proceed to
   	OK
   	NG

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY): 

Refer to REMOVAL [12/2012 - 10/2015] or REMOVAL [10/2015 - ] .

Result: 

OK 

See step  4

1. Temporarily replace the No. 1 indoor electrical key antenna assembly (front floor) with a new or known good one.

   Refer to REMOVAL [12/2012 - ] .

Result: 

NEXT 

See step  5

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [12/2012 - ]

   Body Electrical > Smart Key > Clear DTCs 

Result: 

NEXT 

See step  6

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [12/2012 - ]

   Body Electrical > Smart Key > Trouble Codes 

   Result	Proceed to
   	DTC B27A5 is not output
   	DTC B27A5 is output

Result: 

DTC B27A5 is not output 

END (NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY [FRONT FLOOR] WAS DEFECTIVE) 

Result: 

DTC B27A5 is output 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY): 

Refer to REMOVAL [12/2012 - 10/2015] or REMOVAL [10/2015 - ] .