B1206

MULTIPLEX COMMUNICATION: LIN COMMUNICATION SYSTEM: B1206: P/W Master Switch Communication Stop

DTC B1206 - P/W Master Switch Communication Stop

DESCRIPTION

This DTC is stored when LIN communication between the multiplex network master switch assembly and main body ECU (instrument panel junction block) stops for more than 10 seconds.






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE:
When using the Techstream to troubleshoot with the engine switch off:

Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH - BATTERY AND BODY GROUND)




(a) Disconnect the I5 switch connector.
(b) Measure the resistance and voltage according to the value(s) in the table below.
Standard Resistance:






Standard Voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE FUSE
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - MULTIPLEX NETWORK MASTER SWITCH)




(a) Disconnect the E59 ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY
(a) Replace the multiplex network master switch assembly Removal.
NEXT -- Continue to next step.
4. CHECK DTC OUTPUT
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Recheck for DTCs.
OK:
DTC B1206 is not output.
NG -- REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
OK -- END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY WAS DEFECTIVE)