DTC B27A1: Open in Driver Side Electrical Antenna 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 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
   D88-3 (CLG1) - p1-6 (ANT1)	Always	Below 1 Ω
   D88-4 (CG1B) - p1-3 (ANT2)	Always	Below 1 Ω
   D88-3 (CLG1) - Body ground	Always	10 kΩ or higher
   D88-4 (CG1B) - Body ground	Always	10 kΩ or higher
   p1-6 (ANT1) - Body ground	Always	10 kΩ or higher
   p1-3 (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.
   Fig 1: Checking Harness And Connector (Front Door Outside Handle - Body Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   p1-2 (GND) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Front Door Outside Handle Assembly (for Driver Side))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the certification ECU (smart key ECU assembly) connector.
   Fig 2: Identifying 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
   D88-3 (CLG1) - D88-15 (E)	Engine switch off All doors closed Key not in cabin	No pulse generation
   D88-3 (CLG1) - D88-15 (E)	Engine switch off All doors closed Key not in cabin All doors locked by wireless lock function	Pulse generation
   D88-4 (CG1B) - D88-15 (E)	Engine switch off All doors closed Key not in cabin	No pulse generation
   D88-4 (CG1B) - D88-15 (E)	Engine switch off All doors closed Key not in cabin All doors locked by wireless lock function	Pulse generation

   TEXT IN ILLUSTRATION
   
   

   *a	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 DISASSEMBLY .

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)