DTC B27A8: Open in Outside Luggage Compartment Electrical Key Antenna 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 outside electrical key oscillator (for rear side).

   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 outside electrical key oscillator (for rear side) connector.
   Fig 1: Identifying Certification ECU And Outside Electrical Key Oscillator Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L63-19 (CLG8) - R19-1 (CLG5)	Always	Below 1 Ω
   L63-20 (CG8B) - R19-2 (CLGB)	Always	Below 1 Ω
   L63-19 (CLG8) - Body ground	Always	10 kΩ or higher
   L63-20 (CG8B) - Body ground	Always	10 kΩ or higher
   R19-1 (CLG5) - Body ground	Always	10 kΩ or higher
   R19-2 (CLGB) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Certification ECU (Smart Key ECU Assembly))
   *2	Front view of wire harness connector (to Outside Electrical Key Oscillator (for Rear Side))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 2: Identifying Outside Electrical Key Oscillator Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   R19-1 (CLG5) - R19-2 (CLGB)	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Outside Electrical Key Oscillator (for Rear Side))

NG → See step   6 

OK: Go to next step 

1. Replace the certification ECU (smart key ECU assembly). Refer to REMOVAL .

NEXT: Go to next step 

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

   OK

   DTC B27A8 is not output.

NG → See step   6 

OK → END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)