Dtc B1206 P/W Master Switch Communication Stop

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - NETWORKING

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

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

CHECK MASTER SWITCH ASSEMBLY (BATTERY VOLTAGE AND BODY GROUND)

REPLACE MASTER SWITCH ASSEMBLY

CHECK FOR DTC

DTC B1206 P/W Master Switch Communication Stop

DESCRIPTION

This DTC is stored when LIN communication between the master switch and main body ECU (cowl side junction block LH) stops for 10 seconds or more.

DTC CodeDTC Detection ConditionTrouble Area
B1206No communication between master switch and main body ECU (cowl side junction block LH) for 10 seconds or more.
Master switch
Main body ECU (cowl side junction block LH)
Harness or connector

WIRING DIAGRAM

Dtc B1206 P/W Master Switch Communication Stop. NETWORKING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

  • NOTICE:
  • When using the intelligent tester with the ignition switch off to troubleshoot:
  • Connect the intelligent tester to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.
  • HINT:
  • DTC B2325 is stored when the communication between the master switch and main body ECU (cowl side junction block LH) stops.
1.CLEAR DTC

Clear the DTC ().

NEXT
2.CHECK FOR DTC

Recheck for DTCs ().

Result
ResultProceed to
DTC B1206 is outputA
DTC B1206 is not outputB
B
USE SIMULATION METHOD TO CHECK ()
A
3.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - MASTER SWITCH)
Dtc B1206 P/W Master Switch Communication Stop. NETWORKING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the E3 ECU connector.

Disconnect the I11*1 or I22*2 switch connector.

  • HINT:
*1: for LHD
*2: for RHD

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    E3-10 (LIN2) - I11-17 (LIN1)*1 or I22-17 (LIN)*2AlwaysBelow 1 Ω
    E3-10 (LIN2) - Body groundAlways10 kΩ or higher
  • Standard Voltage:
  • Tester ConnectionConditionSpecified Condition
    E3-10 (LIN2) - Body groundAlwaysBelow 1 V
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
4.CHECK MASTER SWITCH ASSEMBLY (BATTERY VOLTAGE AND BODY GROUND)
Dtc B1206 P/W Master Switch Communication Stop. NETWORKING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the I11*1 or I22*2 switch connector.

  • HINT:
*1: for LHD
*2: for RHD

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    I11-12 (GND)*1 or I22-12 (GND)*2 - Body groundAlwaysBelow 1 Ω
  • Standard Voltage:
  • Tester ConnectionConditionSpecified Condition
    I11-11 (B)*1 or I22-11 (B)*2 - Body groundAlways11 to 14 V
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
5.REPLACE MASTER SWITCH ASSEMBLY

Temporarily replace the master switch assembly with a new or normally functioning one ().

Clear the DTC ().

NEXT
6.CHECK FOR DTC

Recheck for DTCs ().

Result
ResultProceed to
DTC B1206 is not outputA
DTC B1206 is outputB
B
REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)
A
END (MASTER SWITCH IS DEFECTIVE)