Dtc U1100 Lost Communication With Seat Belt Control Ecu

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - NETWORKING

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PRECAUTION

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

CHECK FOR OPEN IN CAN BUS WIRE (SEAT BELT CONTROL ECU CAN BRANCH WIRE)

CHECK HARNESS AND CONNECTOR (SEAT BELT CONTROL ECU - BATTERY AND BODY GROUND)

DTC U1100 Lost Communication with Seat Belt Control ECU

DESCRIPTION

DTC CodeDTC Detection ConditionTrouble Area
U1100There is no communication from the seat belt control ECU.
Power source circuit of seat belt control ECU
Seat belt control ECU CAN branch wire or connector
Seat belt control ECU
For vehicles with a pre-crash safety system.

WIRING DIAGRAM

Dtc U1100 Lost Communication With Seat Belt Control Ecu. NETWORKING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

  • NOTICE:
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  • HINT:
  • Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
1.PRECAUTION
  • NOTICE:
  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work ().
NEXT
2.DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.

  • CAUTION:
  • For vehicles with an SRS system:
  • Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
  • NOTICE:
  • When disconnecting the cable, some systems need to be initialized after the cable is reconnected ().
NEXT
3.CHECK FOR OPEN IN CAN BUS WIRE (SEAT BELT CONTROL ECU CAN BRANCH WIRE)
Dtc U1100 Lost Communication With Seat Belt Control Ecu. NETWORKING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the E42 seat belt control ECU connector.

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

  • Standard Resistance:
  • Tester ConnectionSwitch ConditionSpecified Condition
    E42-1 (CANH) - E42-2 (CANL)Ignition switch off54 to 69 Ω
Text in Illustration
*aRear view of wire harness connector
(to Seat Belt Control ECU)
NG
REPAIR OR REPLACE SEAT BELT CONTROL ECU CAN BRANCH WIRE OR CONNECTOR (CANH, CANL)
OK
4.CHECK HARNESS AND CONNECTOR (SEAT BELT CONTROL ECU - BATTERY AND BODY GROUND)
Dtc U1100 Lost Communication With Seat Belt Control Ecu. NETWORKING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Connect the cable to the negative (-) battery terminal.

  • NOTICE:
  • When disconnecting the cable, some systems need to be initialized after the cable is reconnected ().

Disconnect the E41 seat belt control ECU connector.

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    E41-8 (PGND) - Body groundAlwaysBelow 1 Ω

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

  • Standard Voltage:
  • Tester ConnectionConditionSpecified Condition
    E41-7 (+B) - Body groundAlways11 to 14 V
    E42-8 (IG1) - Body groundIgnition switch ON11 to 14 V
Text in Illustration
*aRear view of wire harness connector
(to Seat Belt Control ECU)
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE SEAT BELT CONTROL ECU ()