Networking. Dtc U1114 Lost Communication With Main Switch Module

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

CHECK FOR OPEN IN CAN BUS WIRE (DRIVING SUPPORT SWITCH CONTROL ECU CAN BRANCH WIRE)

CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT SWITCH CONTROL ECU - BATTERY AND BODY GROUND)

DTC U1114 Lost Communication with Main Switch Module

DESCRIPTION

DTC Code	DTC Detection Condition	Trouble Area
U1114	There is no communication from the driving support switch control ECU.	Power source circuit of driving support switch control ECU Driving support switch control ECU CAN branch wire or connector Driving support switch control ECU

For vehicles with a multi-function switch.

WIRING DIAGRAM

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System.
Dtc
U1114 Lost Communication With Main Switch Module

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.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:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the airbag system.
NOTICE:
1. 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 (LandCruiser RM000003YMD00TX.html).
2. When disconnecting the cable, some systems need to be initialized after the cable is reconnected (LandCruiser RM000003YMF011X.html).

NEXT

2.CHECK FOR OPEN IN CAN BUS WIRE (DRIVING SUPPORT SWITCH CONTROL ECU CAN BRANCH WIRE)

for Automatic Transmission:
1. Disconnect the G163 driving support switch control ECU connector.
2. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Switch Condition
  Specified Condition
  G163-2 (CANP) - G163-3 (CANN)
  Ignition switch off
  54 to 69 Ω
  Text in Illustration
  *a
  Front view of wire harness connector
  (to Driving Support Switch Control ECU)

for Manual Transmission:
1. Disconnect the G76 driving support switch control ECU connector.
2. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Switch Condition
  Specified Condition
  G76-9 (CANP) - G76-10 (CANN)
  Ignition switch off
  54 to 69 Ω
  Text in Illustration
  *a
  Rear view of wire harness connector
  (to Driving Support Switch Control ECU)

REPAIR OR REPLACE DRIVING SUPPORT SWITCH CONTROL ECU CAN BRANCH WIRE OR CONNECTOR (CANP, CANN)

OK

3.CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT SWITCH CONTROL ECU - BATTERY AND BODY GROUND)

Connect the cable to the negative (-) battery terminal.
NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected (LandCruiser RM000003YMF011X.html).

for Automatic Transmission:
1. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  G163-7 (GND) - Body ground
  Always
  Below 1 Ω
2. Measure the voltage according to the value(s) in the table below.
  Standard Voltage:
  Tester Connection
  Condition
  Specified Condition
  G163-8 (+B) - Body ground
  Always
  11 to 14 V
  G163-10 (IG) - Body ground
  Ignition switch ON
  11 to 14 V

Text in Illustration
*a	Front view of wire harness connector (to Driving Support Switch Control ECU)

for Manual Transmission:
1. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  G76-16 (GND) - Body ground
  Always
  Below 1 Ω
2. Measure the voltage according to the value(s) in the table below.
  Standard Voltage:
  Tester Connection
  Condition
  Specified Condition
  G76-6 (+B) - Body ground
  Always
  11 to 14 V
  G76-7 (IG) - Body ground
  Ignition switch ON
  11 to 14 V

Text in Illustration
*a	Rear view of wire harness connector (to Driving Support Switch Control ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE DRIVING SUPPORT SWITCH CONTROL ECU (LandCruiser RM00000466X024X.html)

Tester Connection	Switch Condition	Specified Condition
G163-2 (CANP) - G163-3 (CANN)	Ignition switch off	54 to 69 Ω

Tester Connection	Condition	Specified Condition
G163-7 (GND) - Body ground	Always	Below 1 Ω