Dtc B1206 P/W Master Switch Communication Stop


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

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

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

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

CLEAR DTC

CHECK FOR DTC

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 (multiplex network body ECU) stops for 10 seconds or more.

DTC Code
DTC Detection Condition
Trouble Area
B1206
No communication between the multiplex network master switch assembly and main body ECU (multiplex network body ECU) for 10 seconds or more.
  1. Multiplex network master switch assembly
  2. Main body ECU (multiplex network body ECU)
  3. Harness or connector

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc B1206 P/W Master Switch Communication Stop


INSPECTION PROCEDURE

NOTICE:
  1. When using the intelligent tester with the ignition switch off to troubleshoot:
    Connect the intelligent tester to the vehicle and turn a courtesy light switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.
  2. Inspect the fuses and bulbs for circuits related to this system before performing the following inspection procedure.
HINT:
When communication between the multiplex network master switch and main body ECU (multiplex network body ECU) stops, DTC B2325 is also stored.
1.CLEAR DTC

  1. Clear the DTCs (LandCruiser RM000002S8D045X.html).


NEXT


2.CHECK FOR DTC

  1. Check for DTCs (LandCruiser RM000002S8D045X.html).

    OK:
    DTC B1206 is not output.


NG
Go to step 3
OK

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

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

  1. Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly (LandCruiser RM000003WBO05FX.html).

  1. Disconnect the K4*1 or J9*2 multiplex network master switch assembly connector.

    1. *1: for LHD
    2. *2: for RHD

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

    Standard Resistance:
    for LHD:
    Tester Connection
    		Condition
    		Specified Condition
    A-16 (LIN2) - K4-17 (LIN1)
    		Always
    		Below 1 Ω
    A-16 (LIN2) or K4-17 (LIN1) - Body ground
    		Always
    		10 kΩ or higher
    for RHD:
    Tester Connection
    		Condition
    		Specified Condition
    A-16 (LIN2) - J9-17 (LIN1)
    		Always
    		Below 1 Ω
    A-16 (LIN2) or J9-17 (LIN1) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc B1206 P/W Master Switch Communication Stop

  1. Disconnect the K4*1 or J9*2 multiplex network master switch assembly connector.

    1. *1: for LHD
    2. *2: for RHD

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

    Standard Resistance:
    for LHD:
    Tester Connection
    		Condition
    		Specified Condition
    K4-12 (GND) - Body ground
    		Always
    		Below 1 Ω
    for RHD:
    Tester Connection
    		Condition
    		Specified Condition
    J9-12 (GND) - Body ground
    		Always
    		Below 1 Ω

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

    Standard Voltage:
    for LHD:
    Tester Connection
    		Condition
    		Specified Condition
    K4-11 (B) - Body ground
    		Always
    		11 to 14 V
    for RHD:
    Tester Connection
    		Condition
    		Specified Condition
    J9-11 (B) - Body ground
    		Always
    		11 to 14 V
Text in Illustration
*A
for LHD
*B
for RHD
*a
Front view of wire harness connector
(to Multiplex Network Master Switch Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

  1. Temporarily replace the multiplex network master switch assembly with a new or normally functioning one (LandCruiser RM000002STU0ARX.html).


NEXT


6.CLEAR DTC

  1. Clear the DTCs (LandCruiser RM000002S8D045X.html).


NEXT


7.CHECK FOR DTC

  1. Check for DTCs (LandCruiser RM000002S8D045X.html).

    OK:
    DTC B1206 is not output.


NG
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (LandCruiser RM000003WBO05FX.html)
OK

END (MULTIPLEX NETWORK MASTER SWITCH IS DEFECTIVE)