DTC B27A1: Open in Driver Side Electrical 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 front door outside handle assembly (for driver 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 front door outside handle assembly (for driver side) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F50-3 (CLG1) - z5-6 (ANT1)	Always	Below 1 Ω
   F50-4 (CG1B) - z5-3 (ANT2)	Always	Below 1 Ω
   F50-3 (CLG1) - Body ground	Always	10 kΩ or higher
   F50-4 (CG1B) - Body ground	Always	10 kΩ or higher
   z5-6 (ANT1) - Body ground	Always	10 kΩ or higher
   z5-3 (ANT2) - Body ground	Always	10 kΩ or higher

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.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   z5-2 (GND) - Body ground	Always	Below 1 Ω

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 Connector Terminal (Smart Key ECU Assembly)

   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
   F50-15 (E) - Body ground	Always	Below 1 Ω

   Standard

   Tester Connection	Condition	Specified Condition
   F50-3 (CLG1) - F50-15 (E)	Power switch off All doors closed Key not in cabin	No pulse generation
   F50-3 (CLG1) - F50-15 (E)	Power switch off All doors closed Key not in cabin All doors locked by wireless lock function	Pulse generation
   F50-4 (CG1B) - F50-15 (E)	Power switch off All doors closed Key not in cabin	No pulse generation
   F50-4 (CG1B) - F50-15 (E)	Power switch off All doors closed Key not in cabin All doors locked by wireless lock function	Pulse generation

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   7 

OK: Go to next step 

1. Replace the front door outside handle assembly (for driver side). Refer to REMOVAL .

NEXT: Go to next step 

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

   OK

   DTC B27A1 is not output.

NG → See step   7 

OK → END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY WAS DEFECTIVE)