DTC B27A1: Open in Driver Side Electrical Antenna Circuit [12/2015 - ]: 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.

Result: 

NG 

CONNECT CONNECTORS PROPERLY 

Result: 

OK 

See step  2

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

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Measure the resistance according to the value(s) in the table below.

   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))

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Reconnect the certification ECU (smart key ECU assembly) connector.

   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))

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

(Refer to REMOVAL [12/2015 - 11/2017] , or refer to REMOVAL [11/2017 - ] )

Result: 

OK 

See step  5

1. Replace the front door outside handle assembly (for driver side) (Refer to DISASSEMBLY [12/2015 - 11/2017] , or refer to DISASSEMBLY [11/2017 - 08/2018] , or refer to DISASSEMBLY [08/2018 - ] ).

Result: 

NEXT 

See step  6

1. Clear the DTCs (Refer to DTC CHECK / CLEAR [12/2015 - ] ).
2. Recheck for DTCs.

   OK

   DTC B27A1 is not output.

Result: 

OK 

END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY WAS DEFECTIVE) 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

(Refer to REMOVAL [12/2015 - 11/2017] , or refer to REMOVAL [11/2017 - ] )