CAN COMMUNICATION SYSTEM (for LHD), Diagnostic DTC:U1117
| DTC Code | DTC Name |
|---|---|
| U1117 | Lost Communication with Accessory Gateway |
DESCRIPTION
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| U1117 | There is no communication from the option connector (bus buffer ECU). |
|
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For vehicles with a bus buffer ECU.
WIRING DIAGRAM
INSPECTION PROCEDURE
Tech Tips
Operating the engine switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
PROCEDURE
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PRECAUTION
Note
After turning the engine 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 Click here.
NEXT 
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DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
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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 SRS system.
Note
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.
NEXT
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CHECK FOR OPEN IN CAN BUS WIRE (BUS BUFFER ECU CAN BRANCH WIRE)
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Text in Illustration *a Front view of wire harness connector
(to Option Connector [Bus Buffer ECU])
Disconnect the option connector (bus buffer ECU) connector from the dealer-installed option.
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Measure the resistance according to the value(s) in the table below.
Standard resistance Tester Connection Switch Condition Specified Condition L134-1 (CANP) - L134-2 (CANN) Engine switch off 54 to 69 Ω
NG 
REPAIR OR REPLACE BUS BUFFER ECU CAN BRANCH WIRE OR CONNECTOR (CANP, CANN)
OK 
REPLACE DEALER-INSTALLED OPTION
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