DTC B27A5: Open in Front Floor Electrical Key Oscillator Circuit [08/2014 - ]: Procedure

1. Turn the power 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.

NG → CONNECT CONNECTORS PROPERLY 

OK: Go to next step 

1. Disconnect the H57 certification ECU (smart key ECU assembly) connector.
2. Disconnect the H35 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
   H57-11 (CLG5) - H35-1 (ANTE5)	Always	Below 1 Ω
   H57-10 (CG5B) - H35-3 (CLGB)	Always	Below 1 Ω
   H57-1 (E) - Body ground	Always	Below 1 Ω
   H57-11 (CLG5) or H35-1 (ANTE5) - Body ground	Always	10 kΩ or higher
   H57-10 (CG5B) or H35-3 (CLGB) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Connect the H57 certification ECU (smart key ECU assembly) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *1	Waveform	-	-
   *a	Component with harness connected (Certification ECU (smart key ECU assembly))	*b	Within approximately 30 seconds from when the door is closed
   *c	After approximately 30 seconds from when the door is closed	-	-

2. Connect the H35 NO. 1 indoor electrical key antenna assembly (front floor) connector.
3. Using an oscilloscope, check the waveform.

   OK

   Tester Connection	Condition	Tool Setting	Specified Condition
   H57-11 (CLG5) - H57-1 (E)	Procedure: Power 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)
   H57-10 (CG5B) - H57-1 (E)	Procedure: Power 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)

NG → See step   7 

OK: Go to next step 

1. Temporarily replace the NO. 1 indoor electrical key antenna assembly (front floor) with a new or known good one. Refer to REMOVAL [08/2014 - ] .

NEXT: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2014 - ] .

NEXT: Go to next step 

1. Check for DTCs. Refer to DTC CHECK / CLEAR [08/2014 - ] .

   OK

   DTC B27A5 is not output.

NG → See step   7 

OK → END (NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR) WAS DEFECTIVE)