DTC B27A5: Open in Front Floor Electrical Key Oscillator Circuit: Procedure

1. Turn the power switch off.
2. Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and the indoor electrical key oscillator (for front floor).

   OK

   Connectors are properly connected.

NG → CONNECT CONNECTORS PROPERLY 

OK: Go to next step 

1. Disconnect the certification ECU (smart key ECU assembly) connector.
2. Disconnect the indoor electrical key oscillator (for front floor) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L62-7 (CLG5) - L11-1 (CLG3)	Always	Below 1 Ω
   L62-8 (CG5B) - L11-3 (CLGB)	Always	Below 1 Ω
   L62-7 (CLG5) - Body ground	Always	10 kΩ or higher
   L62-8 (CG5B) - Body ground	Always	10 kΩ or higher
   L11-1 (CLG3) - Body ground	Always	10 kΩ or higher
   L11-3 (CLGB) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the certification ECU (smart key ECU assembly) connector.
   Fig 1: Identifying Certification ECU (Smart Key ECU Assembly) Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance and check for pulses according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L62-15 (E) - Body ground	Always	Below 1 Ω

   Standard

   Tester Connection	Condition	Specified Condition
   L62-7 (CLG5) - L62-15 (E)	Power switch off All doors closed Key not in cabin Door outside handle assembly (lock sensor) not touched	No pulse generation
   L62-7 (CLG5) - L62-15 (E)	Power switch off All doors closed Key not in cabin Door outside handle assembly (lock sensor) touched	Pulse generation
   L62-8 (CG5B) - L62-15 (E)	Power switch off All doors closed Key not in cabin Door outside handle assembly (lock sensor) not touched	No pulse generation
   L62-8 (CG5B) - L62-15 (E)	Power switch off All doors closed Key not in cabin Door outside handle assembly (lock sensor) touched	Pulse generation

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Certification ECU (Smart Key ECU Assembly))

NG → See step   6 

OK: Go to next step 

1. Replace the indoor electrical key oscillator (for front floor). Refer to REMOVAL .

NEXT: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK/CLEAR .
2. Recheck for DTCs.

   OK

   DTC B27A5 is not output.

NG → See step   6 

OK → END (INDOOR ELECTRICAL KEY OSCILLATOR WAS DEFECTIVE)