B1215

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DIAGNOSTIC TROUBLE CODE (BACK DOOR ECU)
(a) Disconnect the back door ECU connector and check for DTCs B1214 and B1215.





OK:
Neither DTC B1214 nor DTC B1215 is output.
NOTE: Disconnect the connector in the operational sequence, and start the next step after the connector is reconnected.

OK -- REPLACE BACK DOOR ECU
NG -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BACK DOOR ECU)
(a) Check for a short-circuit in B+ or body ground.








(b) Disconnect the S2 back door ECU connector and E6 main body ECU connector.
(1) Measure the voltage between the terminals of the S2 back door ECU or E6 main body ECU connector and body ground.
Standard voltage:






(2) Check the resistance.
Standard resistance:





(c) Reconnect the back door ECU connector and main body ECU connector.
NG -- REPAIR OR REPLACE WIRE HARNESS BETWEEN MAIN BODY ECU AND BACK DOOR ECU
OK -- REPLACE MAIN BODY ECU