DTC B27A7: Open in Inside Luggage Compartment Electrical Key Oscillator Circuit [03/2017 - ]: 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 No. 3 indoor electrical key oscillator (inside luggage).

   OK

   Connectors are properly connected.

Result: 

NG 

CONNECT CONNECTORS PROPERLY 

Result: 

OK 

See step  2

1. Disconnect the D40 and D48 certification ECU (smart key ECU assembly) connector.
2. Disconnect the H9 No. 3 indoor electrical key oscillator (inside luggage) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D40-9 (CLG7) - H9-1 (ANTE7)	Always	Below 1 Ω
   D40-8 (CG7B) - H9-3 (CLGB)	Always	Below 1 Ω
   D48-11 (GND) - Body ground	Always	Below 1 Ω
   D40-9 (CLG7) or H9-1 (ANTE7) - Body ground	Always	10 kΩ or higher
   D40-8 (CG7B) or H9-3 (CLGB) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Reconnect the D40 and D48 certification ECU (smart key ECU assembly) connector.
2. Reconnect the H9 No. 3 indoor electrical key oscillator (inside luggage) connector.
3. Using an oscilloscope, check the waveform.

   HINT: 

   Check that the customizing "Ignition Available Area" setting of smart key system is All (Refer to CUSTOMIZE PARAMETERS [03/2017 - ] ).

   OK

   Tester Connection	Switch Condition	Tool Setting	Specified Condition
   D40-9 (CLG7) - D48-11 (GND)	Procedure: Engine switch off Door is open Door is closed 30 seconds elapse Electrical key transmitter not inside vehicle	2 V/DIV., 500 ms/DIV.	Pulse generation (See waveform)
   D40-8 (CG7B) - D48-11 (GND)	Procedure: Engine switch off Door is open Door is closed 30 seconds elapse Electrical key transmitter not inside vehicle	2 V/DIV., 500 ms/DIV.	Pulse generation (See waveform)

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [03/2017 - ] 

Result: 

OK 

See step  4

1. Temporarily replace the No. 3 indoor electrical key oscillator (inside luggage) with a new or normally functioning one (Refer to REMOVAL [03/2017 - ] ).

Result: 

NEXT 

See step  5

1. Clear the DTCs (Refer to DTC CHECK / CLEAR [03/2017 - ] ).
2. Recheck for DTCs (Refer to DTC CHECK / CLEAR [03/2017 - ] ).

   OK

   B27A7 is not output.

Result: 

OK 

END (NO. 3 INDOOR ELECTRICAL KEY OSCILLATOR WAS DEFECTIVE) 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [03/2017 - ]