B1214

MULTIPLEX COMMUNICATION: MULTIPLEX COMMUNICATION SYSTEM: B1214: Short to B+ in Door System Communication Bus Malfunction

DTC B1214 - Short to B+ in Door System Communication Bus Malfunction

DTC B1215 - Short to GND in Door System Communication Bus Malfunction

DESCRIPTION
- This DTC is output when a +B or GND short occurs on the door system communication bus.





WIRING DIAGRAM









INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC (BODY ECU - POWER SEAT ECU)
(a) Check whether the output of the DTC stops when the B3 connector of the body ECU is disconnected.




NOTE:
Disconnect connector in operational sequence, and start the next operation after the connector is connected.

Standard:
The output of the DTC stops.
HINT: There is a malfunction between the B3 connector of the body ECU and the power seat ECU.

NO -- CHECK DTC (BODY ECU - BODY NO.2 ECU, DRIVER DOOR ECU)
YES -- Continue to next step.
2. CHECK DTC (POWER SEAT ECU)
(a) Check whether the output of the DTC stops when the power seat ECU connector is disconnected.




NOTE:
Disconnect connector in operational sequence, and start the next operation after the connector is connected.

Standard:
The output of the DTC stops.
HINT: The power seat ECU is abnormal.

YES -- REPLACE POWER SEAT ECU
NO -- Continue to next step.
3. CHECK DTC (MIRROR ECU AND WIRE HARNESS)
(a) Check whether the output of the DTC stops when the mirror ECU connector is disconnected.




NOTE:
Disconnect connectors in operational sequence, and start the next operation after the connector is connected.

Standard:
The output of the DTC stops.
HINT: The mirror ECU itself or the wire harness between the mirror ECU and the power seat ECU is abnormal.

YES -- REPAIR OR REPLACE MIRROR ECU OR WIRE HARNESS
NO -- Continue to next step.
4. CHECK DTC (TILT AND TELESCOPIC ECU AND WIRE HARNESS)
(a) Check whether the output of the DTC stops when the tilt and telescopic ECU connector is disconnected.




NOTE:
Disconnect connectors in operational sequence, and start the next operation after the connector connected.

Standard:
The output of the DTC stops.
HINT: The tilt and telescopic ECU itself or the wire harness between the tilt and telescopic ECU and the mirror ECU is abnormal.

YES -- REPAIR OR REPLACE TILT AND TELESCOPIC ECU OR WIRE HARNESS
NO -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (BODY ECU - TILT AND TELESCOPIC ECU)
(a) Check whether the output of the DTC stops when the wire harness is disconnected.




NOTE:
Disconnect connectors in operational sequence, and start the next operation after the connector is connected.

Standard:
The output of the DTC stops.
HINT: The wire harness between the B3 connector of the body ECU and the tilt and telescopic ECU is abnormal.

YES -- REPAIR OR REPLACE HARNESS OR CONNECTOR
NO -- Continue to next step.
6. CHECK DTC (BODY ECU - BODY NO.2 ECU, DRIVER DOOR ECU)
(a) Check whether the output of the DTCs stops when the B3 connector of the body ECU and body No. 2 ECU connector are disconnected.




NOTE:
Disconnect connectors in operational sequence, and start the next operation after the connector is connected.

Standard:
The output of the DTC stops.
HINT: There is a malfunction between the B3 connector of the body ECU and the body No. 2 ECU.

NO -- CHECK DTC (MAYDAY ECU)
YES -- Continue to next step.
7. CHECK DTC (DRIVER DOOR ECU)
(a) Check whether the output of the DTC stops when the driver door ECU connector is disconnected.




NOTE:
Disconnect connector in operational sequence, and start the next operation after the connector is connected.

Standard:
The output of the DTC stops.
HINT: The driver door ECU is abnormal.

YES -- REPLACE POWER WINDOW REGULATOR MASTER SWITCH (DRIVER DOOR ECU)
NO -- Continue to next step.
8. CHECK HARNESS AND CONNECTOR (BODY ECU - DRIVER DOOR ECU)
(a) Check whether the output of the DTC stops when the B3 connector of the body ECU and the driver door ECU connector are disconnected.




NOTE:
Disconnect connectors in operational sequence, and start the next operation after the connector is connected.

Standard:
The output of the DTC stops.
HINT: The wire harness between the driver door ECU and B3 connector of the body ECU is abnormal.

YES -- REPAIR OR REPLACE HARNESS OR CONNECTOR
NO -- Continue to next step.
9. CHECK DTC (BODY NO.2 ECU)
(a) Check whether the output of the DTC stops when the body No. 2 ECU connector is disconnected.




NOTE:
Disconnect connectors in operational sequence, and start the next operation after the connector is connected.

Standard:
The output of the DTC stops.
HINT: The body No. 2 ECU is abnormal.

YES -- REPLACE MULTIPLEX NETWORK BODY ECU NO.2 (BODY NO.2 ECU)
NO -- Continue to next step.
10. CHECK HARNESS AND CONNECTOR (BODY NO.2 ECU - DRIVER DOOR ECU)
(a) Check whether the output of the DTC stops when the body No. 2 ECU connector is disconnected.




NOTE:
Disconnect connectors in operational sequence, and start the next operation after the connector is connected.

Standard:
The output of the DTC stops.
HINT: The wire harness between the body No. 2 ECU and the driver door ECU is abnormal.

YES -- REPAIR OR REPLACE HARNESS OR CONNECTOR
NO -- Continue to next step.
11. CHECK DTC (MAYDAY ECU)
(a) Check whether the output of the DTC stops when the mayday ECU connector is disconnected.




NOTE:
Disconnect connectors in operational sequence, and start the next operation after the connector is connected.

Standard:
The output of the DTC stops.
HINT: The mayday ECU is abnormal.

YES -- REPLACE MAYDAY ECU
NO -- Continue to next step.
12. CHECK DTC (THEFT DETERRENT ECU)
(a) Check whether the output of the DTC stops when the theft deterrent ECU connector is disconnected.




NOTE:
Disconnect connectors in operational sequence, and start the next operation after the connector is connected.

Standard:
The output of the DTC stops.
HINT: The theft deterrent ECU is abnormal.

YES -- REPLACE THEFT DETERRENT ECU
NO -- Continue to next step.
13. CHECK DTC (RAIN SENSOR)
(a) Check whether the output of the DTC stops when the rain sensor connector is disconnected.




NOTE:
Disconnect connectors in operational sequence, and start the next operation after the connector is connected.

Standard:
The output of the DTC stops.
HINT: The rain sensor is abnormal.

YES -- REPLACE RAIN SENSOR
NO -- Continue to next step.
14. CHECK DTC (WIPER ECU - RAIN SENSOR)
(a) Check whether the output of the DTC stops when the wiper ECU connector is disconnected.




NOTE:
Disconnect connectors in operational sequence, and start the next operation after the connector is connected.

Standard:
The output of the DTC stops.
HINT: The wiper ECU or the wire harness between the wiper ECU and the rain sensor is abnormal.

YES -- REPAIR OR REPLACE WIPER ECU OR WIRE HARNESS
NO -- Continue to next step.
15. CHECK HARNESS AND CONNECTOR (J/B - BODY NO.2 ECU)
(a) Check whether the output of the DTC stops when the B5 connector of the J/B and the body No. 2 ECU connector are disconnected.





Standard:
The output of the DTC stops.
HINT: The wire harness between the B5 connector of the J/B and the body No. 2 ECU is abnormal.

YES -- REPAIR OR REPLACE HARNESS OR CONNECTOR
NO -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK (BODY ECU)