Dtc B1214 Door System Communication Bus Malfunction (+B Short)

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 NETWORK GATEWAY ECU AND A ECU OR C ECU

DESCRIPTION

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

   DTCs B1214 and B1215 are not output.
   

   NOTICE:

   Reconnect the connector before starting the next check.

   HINT:

   1. The A ECU in the door system bus represents the power source control ECU.
      
   1. If the result is as specified, the disconnected A ECU (power source control ECU) is malfunctioning.
      

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

   OK:

   DTCs B1214 and B1215 are not output.
   

   NOTICE:

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

   HINT:

   1. The B ECU in the door system bus represents one of the following: position control ECU, multiplex network door ECU front RH (front door ECU RH), multiplex network door ECU rear RH (rear door RH ECU), multiplex network switch (rear RH), multiplex network door ECU rear LH (rear door LH ECU), multiplex network switch (rear LH), multiplex network door ECU front LH (front door ECU LH), multiplex network master switch, sliding roof control ECU or overhead junction block.
      
   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.
      

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

   OK:

   DTCs B1214 and B1215 are not output.
   

   NOTICE:

   Reconnect the connector before starting the next check.

   HINT:

   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:

   DTCs B1214 and B1215 are not 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 power source control ECU.
      
   1. If the result is as specified, the disconnected C ECU (power source control ECU) 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:

   DTCs B1214 and B1215 are not 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 / Network gateway ECU connector - Body ground	Below 1 V
C ECU connector / Network gateway ECU connector - Body ground	Below 1 V

Standard resistance:

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

HINT:

1. The A ECU in the door system bus represents the certification ECU.
   

1. The C ECU in the door system bus represents the power source control ECU.