Dtc B27A4 Open In Rear Door Electrical Antenna Circuit, Front Passengers Side

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CONNECTOR CONNECTION

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - REAR DOOR OUTSIDE HANDLE ASSEMBLY [FOR FRONT PASSENGER SIDE])

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO REAR DOOR OUTSIDE HANDLE ASSEMBLY [FOR FRONT PASSENGER SIDE])

REPLACE REAR DOOR OUTSIDE HANDLE ASSEMBLY (FOR FRONT PASSENGER SIDE)

CLEAR DTC

CHECK FOR DTC

DESCRIPTION

1. *: Only output while a malfunction is present.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. The entry and start system (for Entry Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the entry and start system (for Entry Function) after confirming that the communication systems are functioning properly (Click here).
   
2. When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
   
3. Before replacing the certification ECU (smart key ECU assembly), refer to entry and start system (for Entry Function) (Click here).
   
4. After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
   

1. Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and rear door outside handle assembly (for front passenger side).
   

   OK:

   Connectors are properly connected.
   

1. Disconnect the E129 and E130 certification ECU (smart key ECU assembly) connectors.
   

2. Disconnect the z77*1 or z78*2 rear door outside handle assembly (for front passenger side) connector.
   

   1. *1: for LHD
      
   2. *2: for RHD
      

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

   Standard Resistance:

   for LHD:

   Tester Connection	Condition	Specified Condition
   E129-10 (CLG4) - z77-6 (ANT1)	Always	Below 1 Ω
   E129-9 (CG4B) - z77-4 (ANT2)	Always	Below 1 Ω
   E130-11 (E) - Body ground	Always	Below 1 Ω
   E129-10 (CLG4) or z77-6 (ANT1) - Body ground	Always	10 kΩ or higher
   E129-9 (CG4B) or z77-4 (ANT2) - Body ground	Always	10 kΩ or higher

   for RHD:

   Tester Connection	Condition	Specified Condition
   E129-10 (CLG4) - z78-6 (ANT1)	Always	Below 1 Ω
   E129-9 (CG4B) - z78-4 (ANT2)	Always	Below 1 Ω
   E130-11 (E) - Body ground	Always	Below 1 Ω
   E129-10 (CLG4) or z78-6 (ANT1) - Body ground	Always	10 kΩ or higher
   E129-9 (CG4B) or z78-4 (ANT2) - Body ground	Always	10 kΩ or higher

4. Reconnect the E129 and E130 certification ECU (smart key ECU assembly) connectors.
   

1. Using an oscilloscope, check the waveform.
   
   

   OK:

   
   

   Tester Connection	Switch Condition	Tool Setting	Specified Condition
   E129-10 (CLG4) - E130-11 (E)	Procedure: Engine switch off All doors closed Electrical key transmitter sub-assembly not inside vehicle All doors locked through wireless operation (electrical key transmitter sub-assembly brought inside detection area*)	5 V/DIV., 500 ms/DIV.	Pulse generation (See waveform 1)
   	Procedure: Engine switch off All doors closed Electrical key transmitter sub-assembly not inside vehicle All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*)	5 V/DIV., 100 ms/DIV.	Pulse generation (See waveform 2)
   E129-9 (CG4B) - E130-11 (E)	Procedure: Engine switch off All doors closed Electrical key transmitter sub-assembly not inside vehicle All doors locked through wireless operation (electrical key transmitter sub-assembly brought inside detection area*)	5 V/DIV., 500 ms/DIV.	Pulse generation (See waveform 3)
   	Procedure: Engine switch off All doors closed Electrical key transmitter sub-assembly not inside vehicle All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*)	5 V/DIV., 100 ms/DIV.	Pulse generation (See waveform 4)

   1. *: For details about the entry function detection area, refer to Operation Check (Click here).
      

1. Replace the rear door outside handle assembly (for front passenger side) with a new one or the rear door outside handle assembly (for driver side) if it is functioning properly (Click here).
   

1. Clear the DTCs (Click here).
   

1. Check for DTCs (Click here).
   

   OK:

   DTC B27A4 is not output.