Toyota Venza: P/W Master Switch Communication Stop (B1206)

Toyota Venza Service Manual / Networking / Lin Communication System / P/W Master Switch Communication Stop (B1206)

DESCRIPTION

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

DTC No.	DTC Detection Condition	Trouble Area
B1206	No communication between the multiplex network master switch assembly and main body ECU (driver side junction block assembly) for more than 10 seconds.	Multiplex network master switch assembly Main body ECU (Driver side junction block assembly) Wire harness or connector ECU-B NO. 2 fuse

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When using the Techstream to troubleshoot with the ignition 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 I6 switch connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
I6-12 (E) - Body ground	Always	Below 1 Ω

Standard Voltage:

Tester Connection	Condition	Specified Condition
I6-11 (B) - Body ground	Always	11 to 14 V

*1	Front view of wire harness connector (to Multiplex Network Master Switch Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - MULTIPLEX NETWORK MASTER SWITCH)

(a) Disconnect the D48 ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D48-10 (LIN2) - I6-17 (LIN1)	Always	Below 1 Ω
I6-17 (LIN1) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Main Body ECU (Driver Side Junction Block Assembly))

Front view of wire harness connector

(to Multiplex Network Master Switch Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) Replace the multiplex network master switch assembly (See page ).

4.	CHECK DTC OUTPUT

(a) Clear the DTC (See page ).

(b) Recheck for DTCs.

OK:

DTC B1206 is not output.

END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY WAS DEFECTIVE)

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

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