DTC B27A7: Open in Inside Luggage Compartment Electrical Key Oscillator Circuit: Procedure

1. Turn the engine 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 rear 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 rear floor) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D88-26 (CLG7) - L12-1 (CLG6)	Always	Below 1 Ω
   D88-27 (CG7B) - L12-2 (CLGB)	Always	Below 1 Ω
   D88-26 (CLG7) - Body ground	Always	10 kΩ or higher
   D88-27 (CG7B) - Body ground	Always	10 kΩ or higher
   L12-1 (CLG6) - Body ground	Always	10 kΩ or higher
   L12-2 (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 D88 Certification ECU (Smart Key ECU Assembly) Connector Terminals

   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
   D88-15 (E) - Body ground	Always	Below 1 Ω

   OK

   Tester Connection	Condition	Specified Condition
   D88-26 (CLG7) - D88-15 (E)	Engine switch off All doors closed Key not in cabin Door outside handle assembly (lock sensor) not touched	No pulse generation
   D88-26 (CLG7) - D88-15 (E)	Engine switch off All doors closed Key not in cabin Door outside handle assembly (lock sensor) touched	Pulse generation
   D88-27 (CG7B) - D88-15 (E)	Engine switch off All doors closed Key not in cabin Door outside handle assembly (lock sensor) not touched	No pulse generation
   D88-27 (CG7B) - D88-15 (E)	Engine 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 rear floor). Refer to REMOVAL .

NEXT: Go to next step 

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

   OK

   DTC B27A7 is not output.

NG → See step   6 

OK → END (INDOOR ELECTRICAL KEY OSCILLATOR WAS DEFECTIVE)