DTC U1117 Lost Communication with Accessory Gateway

DTC B2779 Engine Starter Communication Malfunction

DTC Code	DTC Detection Condition	Trouble Area
U1117	There is no communication from the accessory bus buffer	Accessory bus buffer CAN branch wire or connector Accessory bus buffer
B2779	There is no communication from the accessory bus buffer	Accessory bus buffer CAN branch wire or connector Accessory bus buffer

Dtc U1117 Lost Communication With Accessory Gateway. NETWORKING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

1.PRECAUTION

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 ().

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2.DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

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

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

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3.CHECK FOR OPEN IN CAN BUS WIRE (ACCESSORY BUS BUFFER CAN BRANCH WIRE)

Disconnect the E6 accessory bus buffer connector.

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

Standard Resistance:
Tester Connection Switch Condition Specified Condition
E6-1 (CAN+) - E6-2 (CAN-) Ignition switch off 54 to 69 Ω

Text in Illustration
*a	Front view of wire harness connector (to Accessory Bus Buffer)

REPAIR OR REPLACE ACCESSORY BUS BUFFER CAN BRANCH WIRE OR CONNECTOR (CAN+, CAN-)

REPLACE ACCESSORY BUS BUFFER

Tester Connection	Switch Condition	Specified Condition
E6-1 (CAN+) - E6-2 (CAN-)	Ignition switch off	54 to 69 Ω