Toyota CH-R Service Manual: P/W Master Switch Communication Stop (B1206)

Toyota CH-R 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 (multiplex network body ECU) stops for 10 seconds or more.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1206	P/W Master Switch Communication Stop	No communication between multiplex network master switch assembly and main body ECU (multiplex network body ECU) for 10 seconds or more.	Multiplex network master switch assembly Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector ECU-B NO. 2 fuse

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.*1
Click here
- *1: w/ Smart Key System

PROCEDURE

1.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.

Click here

Component without harness connected

(Instrument Panel Junction Block Assembly)

(b) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

HINT:

This inspection is to check the LIN communication line in the instrument panel junction block assembly that connects the wire harness to the built-in main body ECU (multiplex network body ECU).

Standard Resistance:

Tester Connection	Condition	Specified Condition
3H-25 - MB-16 (LIN2)	Always	Below 1 Ω

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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

(a) Disconnect the J6 multiplex network master switch assembly connector.

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

NOTICE:

Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
3H-25 - J6-17 (LIN1)	Ignition switch off	Below 1 Ω
J6-17 (LIN1) or 3H-25 - Body ground	Ignition switch off	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
J6-11 (B) - J6-12 (GND)	Always	11 to 14 V

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
J6-12 (GND) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) Replace the multiplex network master switch assembly.

Click here

5.	CHECK FOR DTC

(a) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs

(b) Recheck for DTCs.

Body Electrical > Main Body > Trouble Codes

OK:

DTC B1206 is not output.

END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY WAS DEFECTIVE)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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