Dtc B1214 Short To B+ In Door System Communication Bus Malfunction

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DIAGNOSTIC TROUBLE CODE (A ECU)

CHECK DIAGNOSTIC TROUBLE CODE (B ECU)

CHECK WIRE HARNESS BETWEEN A ECU AND B ECU

CHECK DIAGNOSTIC TROUBLE CODE (C ECU)

CHECK WIRE HARNESS BETWEEN B ECU AND C ECU

CHECK WIRE HARNESS BETWEEN GATEWAY ECU AND A ECU OR C ECU

DESCRIPTION

1. When a +B short circuit or body ground short circuit is detected on the door system communication bus (BEAN), BEAN is disabled and a DTC is output.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Disconnect the A ECU connector and check for DTCs B1214 and B1215.
   

   
   
   
   

   OK:

   Neither DTC B1214 nor DTC B1215 is output.
   

   NOTICE:

   Reconnect the connector before starting the next check.

   HINT:

   1. The A ECU in the door system bus represents the main body ECU RH (cowl side J/B RH).
      
   2. If the result is as specified, the disconnected A ECU (main body ECU RH (cowl side J/B RH)) is malfunctioning.
      

1. Disconnect the A ECU and B ECU connectors and check for DTCs B1214 and B1215.
   

   
   
   
   

   OK:

   Neither DTC B1214 nor DTC B1215 is output.
   

   NOTICE:

   Disconnect the connectors one by one. Reconnect the connectors before starting the next check.

   HINT:

   1. Remove the B ECUs in the following order:
      
   1. Power window master switch
      
   2. Certification ECU
      
   3. Power source control ECU
      
   4. Main body ECU LH (cowl side J/B LH)
      
   5. Front controller
      
   1. If the result is as specified, the disconnected B ECU (one of the ECUs from the above list) or the wire harness between the A ECU and B ECU is malfunctioning.
      
   2. After the DTC is cleared, proceed to the next step.
      

1. Disconnect the B ECU connector and check for DTCs B1214 and B1215.
   

   
   
   
   

   OK:

   Neither DTC B1214 nor DTC B1215 is output.
   

   NOTICE:

   Reconnect the connector before starting the next check.

   HINT:

   1. If the result is as specified, the wire harness between the A ECU and B ECU is functioning normally but the disconnected B ECU is malfunctioning.
      

1. Disconnect the B ECU and C ECU connectors and check for DTCs B1214 and B1215.
   

   
   
   
   

   OK:

   Neither DTC B1214 nor DTC B1215 is output.
   

   NOTICE:

   Disconnect the connectors one by one. Reconnect the connectors before starting the next check.

   HINT:

   1. The C ECU in the door system bus represents the windshield wiper switch.
      
   2. If the result is as specified, the disconnected C ECU (windshield wiper switch) or the wire harness between the B ECU and C ECU is malfunctioning.
      

1. Disconnect the C ECU connector and check for DTCs B1214 and B1215.
   

   
   
   
   

   OK:

   Neither DTC B1214 nor DTC B1215 is output.
   

   NOTICE:

   Reconnect the connector before starting the next check.

   HINT:

   If the result is as specified, the wire harness between the B ECU and C ECU is functioning normally but the disconnected C ECU is malfunctioning.

1. Check for a short-circuit in +B or body ground.
   

   
   
   
   

   1. Disconnect the A ECU, C ECU and gateway ECU connectors.
      

   2. Measure the voltage and resistance of the wire harness side connectors.
      
      

      Standard voltage:

      
      

      Tester Connection	Specified Condition
      A ECU connector/gateway ECU connector - Body ground	Below 1 V
      C ECU connector/gateway ECU connector - Body ground	Below 1 V

      
      

      Standard resistance:

      
      

      Tester Connection	Specified Condition
      A ECU connector/gateway ECU connector - Body ground	10 kΩ or higher
      C ECU connector/gateway ECU connector - Body ground	10 kΩ or higher

      HINT:

      1. The A ECU in the door system bus represents the main body ECU RH (cowl side J/B RH).
         
      2. The C ECU in the door system bus represents the windshield wiper switch.