B1206

NETWORKING: LIN COMMUNICATION SYSTEM: B1206: P/W Master Switch Communication Stop
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 stops for 10 seconds or more.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* When using the Techstream with the ignition switch off to troubleshoot:
Connect the Techstream to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT
DTC B2325 is stored when the communication between the multiplex network master switch assembly and main body ECU stops.

PROCEDURE

1. CLEAR DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

2. CHECK FOR DTC

(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result





HINT
When both B1206 and B2325 are output at the same time, troubleshoot B2325 first.

B -- GO TO DIAGNOSTIC TROUBLE CODE CHART LIN Communication System
A -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY)





(a) Disconnect the 2D instrument panel junction block assembly connector.

(b) Disconnect the H8 multiplex network master switch assembly connector.

(c) Measure the resistance and voltage according to the value(s) in the table below.

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

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

(a) Disconnect the H8 multiplex network master switch assembly connector.





(b) Measure the resistance and voltage according to the value(s) in the tables below.

Standard Resistance:





Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) Replace the multiplex network master switch assembly with a normally functioning part Removal.

(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

6. CHECK FOR DTC

(a) Recheck for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result





B -- INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

A -- END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY MALFUNCTION)

7. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY





Text in Illustration





(a) Remove the Instrument Panel junction block Assembly Removal.

(b) Remove the main body ECU from the Instrument Panel junction block Assembly Removal.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





NG -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Removal

OK -- REPLACE MAIN BODY ECU Removal