B1214

MULTIPLEX COMMUNICATION: MULTIPLEX COMMUNICATION SYSTEM: B1214, B1215: Short to B+ in Door System Communication Bus Malfunction
B1215 - Short to GND in Door System Communication Bus Malfunction

DESCRIPTION

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DIAGNOSTIC TROUBLE CODE (A ECU)





(a) 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
* The A ECU in the door system bus represents the certification ECU.
* If the result is as specified, the disconnected A ECU (certification ECU) is malfunctioning.

NG -- CHECK DIAGNOSTIC TROUBLE CODE (B ECU)

OK -- REPLACE A ECU

2. CHECK DIAGNOSTIC TROUBLE CODE (B ECU)





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

NG -- CHECK DIAGNOSTIC TROUBLE CODE (C ECU)
OK -- Continue to next step.

3. CHECK WIRE HARNESS BETWEEN A ECU AND B ECU





(a) 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.

NG -- REPAIR OR REPLACE WIRE HARNESS BETWEEN A ECU AND B ECU

OK -- REPLACE B ECU

4. CHECK DIAGNOSTIC TROUBLE CODE (C ECU)





(a) 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
* The C ECU in the door system bus represents the power source control ECU.
* 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.

NG -- CHECK WIRE HARNESS BETWEEN NETWORK GATEWAY ECU AND A ECU OR C ECU
OK -- Continue to next step.

5. CHECK WIRE HARNESS BETWEEN B ECU AND C ECU





(a) 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.

NG -- REPAIR OR REPLACE WIRE HARNESS BETWEEN B ECU AND C ECU

OK -- REPLACE C ECU

6. CHECK WIRE HARNESS BETWEEN NETWORK GATEWAY ECU AND A ECU OR C ECU





(a) 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:





Standard resistance:





HINT
* The A ECU in the door system bus represents the certification ECU.
* The C ECU in the door system bus represents the power source control ECU.

NG -- REPAIR OR REPLACE WIRE HARNESS BETWEEN NETWORK GATEWAY ECU AND A ECU OR C ECU

OK -- REPLACE NETWORK GATEWAY ECU