B2779

THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILIZER SYSTEM: B2779: Engine Starter Communication Malfunction
B2779 - Engine Starter Communication Malfunction

DESCRIPTION

If communication between the remote start ECU and certification ECU (smart key ECU assembly) cannot be performed even if a remote start operation is performed to try changing the power source mode to on (IG) or start the hybrid control system, this DTC is stored.

When the remote start ECU does not respond to the certification ECU (smart key ECU assembly), this DTC is stored. When communication with the remote start ECU is established and a remote start operation is performed, this DTC is cleared.





* *: Only output while a malfunction is present.

Vehicle Condition and Fail-safe Operation when Malfunction Detected





Related Data List and Active Test





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.
* Before performing the inspection, check that DTC U0142 is not output.
* Before replacing the certification ECU (smart key ECU assembly), refer to Registration Engine Immobilizer System.
* After performing repair, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

HINT
In this repair information, only the terminal numbers used for inspection between the main body ECU (multiplex network body ECU) and option connector are listed.

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Smart Access / Data List.

(f) According to the display on the Techstream, read the Data List.

Smart Access (Certification ECU (Smart Key ECU Assembly))





OK:

"Regd" appears on the screen.

Result





B -- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - OPTION CONNECTOR)
A -- Continue to next step.

2. REGISTER REMOTE START ID

(a) Register the remote start ID.

NEXT -- Continue to next step.

3. CHECK REMOTE START

(a) Check that the hybrid control system can be started using remote start operation.

OK:

Hybrid control system can be started using remote start operation.

NG -- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - OPTION CONNECTOR)

OK -- END (REMOTE START ID WAS NOT REGISTERED CORRECTLY)

4. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - OPTION CONNECTOR)

HINT
In this repair information, only the terminal numbers used for inspection between the main body ECU and option connector are listed.

(a) Disconnect the H16 and H17 main body ECU (multiplex network body ECU) connector.

(b) Disconnect the H90 option connector.

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

Standard Resistance:





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

5. CHECK HARNESS AND CONNECTOR (OPTION CONNECTOR - BATTERY AND BODY GROUND)

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

Standard Voltage:





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

6. REPLACE REMOTE START

(a) Temporarily replace the remote start ECU with a new one.

(b) Register the remote start ID.

(c) Check that the hybrid control system can be started using remote start operation.

OK:

Hybrid control system can be started using remote start operation.

NG -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

OK -- END (REMOTE START ECU WAS DEFECTIVE)

7. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Temporarily replace the main body ECU (multiplex network body ECU) with a new or known good one Removal.

(b) Check that the hybrid control system can be started using remote start operation.

OK:

Hybrid control system can be started using remote start operation.

NG -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal

OK -- END (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) WAS DEFECTIVE)