Engine Immobiliser System (w/o Smart Key System)

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM (w/o Smart Key System): B2785: Communication Malfunction between ECUs Connected by LIN

DTC B2785 - Communication Malfunction between ECUs Connected by LIN

DESCRIPTION

This DTC is output if communication between the transponder key ECU and power source control ECU is not possible.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK WIRE HARNESS (TRANSPONDER KEY ECU - POWER SOURCE CONTROL ECU)




(a) Reconnect the T5 and P6 ECU connectors.
(b) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

2. CHECK TRANSPONDER KEY ECU (OPERATION)
(a) Temporarily replace the transponder key ECU with a new or normally functioning one.
(b) Check that the power switch can be turned ON (ACC and IG) and the hybrid control system can be started.
OK:
Power switch can be turned ON (ACC and IG) and hybrid control system can be started.
NG -- REPLACE POWER SOURCE CONTROL ECU
OK -- END (TRANSPONDER KEY ECU IS DEFECTIVE)