B2779

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

DESCRIPTION

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

When the remote engine starter ECU does not respond to the certification ECU (smart key ECU assembly), this DTC is stored. When communication with the remote engine starter ECU is established, this DTC is cleared.





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 remote engine starter ECU, refer to Registration of the remote engine starter system Remote Engine Starter System.
* Before replacing the certification ECU (smart key ECU assembly), refer to Registration of the engine immobiliser system Engine Immobilizer System (w/ Smart Key System).
* The remote engine starter system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting How To Proceed With Troubleshooting. Troubleshoot the remote engine starter system after confirming that the communication systems are functioning properly.

PROCEDURE

1. CHECK DTC OUTPUT

(a) Clear the DTC Remote Engine Starter System.

(b) Perform the remote engine start operation.

(c) Check for DTCs.

OK:

DTC B126A is not output.

NG -- GO TO OTHER FLOW CHART (B126A) B126A
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

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

(d) Turn the Techstream on.

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

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

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





Result:





B -- CHECK HARNESS AND CONNECTOR (REMOTE ENGINE STARTER ECU - BATTERY AND BODY GROUND)
A -- Continue to next step.

3. REGISTER REMOTE ENGINE STARTER ID

(a) Register the remote engine starter ID Remote Engine Starter System.

NEXT -- Continue to next step.

4. CHECK DTC OUTPUT

(a) Clear the DTC Remote Engine Starter System.

(b) Perform the remote engine start operation.

(c) Check for DTCs.

OK:

DTC B2779 is not output.

NG -- REPLACE REMOTE ENGINE STARTER ECU

OK -- END (REMOTE ENGINE STARTER ID WAS NOT REGISTERED CORRECTLY)

5. CHECK HARNESS AND CONNECTOR (REMOTE ENGINE STARTER ECU - BATTERY AND BODY GROUND)

(a) Disconnect the I141 remote engine starter ECU connector.

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

Standard Voltage:





Standard Resistance:





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

6. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - REMOTE ENGINE STARTER ECU)

(a) Disconnect the I13 main body ECU (multiplex network body ECU) connector.

(b) 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.

7. REPLACE REMOTE ENGINE STARTER ECU

(a) Temporarily replace the remote engine starter ECU with a new one Removal.

NEXT -- Continue to next step.

8. REGISTER REMOTE ENGINE STARTER ID

(a) Register the remote engine starter ID Remote Engine Starter System.

NEXT -- Continue to next step.

9. CHECK DTC OUTPUT

(a) Clear the DTC Remote Engine Starter System.

(b) Perform the remote engine start operation.

(c) Check for DTCs.

OK:

DTC B2779 is not output.

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

OK -- END (REMOTE ENGINE STARTER ECU WAS DEFECTIVE)

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

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

NEXT -- Continue to next step.

11. CHECK DTC OUTPUT

(a) Clear the DTC Remote Engine Starter System.

(b) Perform the remote engine start operation.

(c) Check for DTCs.

OK:

DTC B2779 is not output.

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

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