DTC B27A5: Open in Front Floor Electrical Key Oscillator Circuit [09/2015 - ]: 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 (front floor).

   OK

   Connectors are properly connected.

Result: 

NG 

CONNECT CONNECTORS PROPERLY 

Result: 

OK 

See step  2

1. Disconnect the E151 certification ECU (smart key ECU assembly) connector.
2. Disconnect the E142 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
   E151-21 (CLG5) - E142-1 (ANTE5)	Always	Below 1 Ω
   E151-20 (CG5B) - E142-3 (CLGB)	Always	Below 1 Ω
   E151-11 (E) - Body ground	Always	Below 1 Ω
   E151-21 (CLG5) or E142-1 (ANTE5) - Body ground	Always	10 kΩ or higher
   E151-20 (CG5B) or E142-3 (CLGB) - Body ground	Always	10 kΩ or higher

4. Reconnect the E151 certification ECU (smart key ECU assembly) connector.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Connect the E151 certification ECU (smart key ECU assembly) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   * a	Component with harness connected (Certification ECU [Smart Key ECU Assembly])	* b	Waveform 1
   * c	For 30 seconds after closing any door using the door outside handle	* d	30 seconds or more have elapsed after closing any door using the door outside handle

2. Using an oscilloscope, check the waveform.

   OK

   Tester Connection	Switch Condition	Tool Setting	Specified Condition
   E151-21 (CLG5) - E151-11 (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)
   E151-20 (CG5B) - E151-11 (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: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

Refer to REMOVAL [09/2015 - ] )

Result: 

OK 

See step  4

1. Temporarily replace the No. 1 indoor electrical key antenna assembly (front floor) with a new one. Refer to REMOVAL [09/2015 - ] .

Result: 

NEXT 

See step  5

1. Clear the DTCs. Refer to DTC CHECK / CLEAR [09/2015 - ] .

Result: 

NEXT 

See step  6

1. Check for DTCs. Refer to DTC CHECK / CLEAR [09/2015 - ] .

   OK

   DTC B27A5 is not output.

Result: 

OK 

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

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

Refer to REMOVAL [09/2015 - ] )