RM35X0E _58 Vehicle Interior _078378 THEFT DETERRENT / KEYLESS ENTRY _0397001 ENTRY AND START SYSTEM(for Start Function) C

THEFT DETERRENT / KEYLESS ENTRY  ENTRY AND START SYSTEM(for Start Function)  B2779  Engine Starter Communication Malfunction  


DESCRIPTION

If the remote engine start ECU does not respond to the certification ECU (smart key ECU assembly) or the remote engine start ID is not registered*, this DTC is stored.

If communication between the remote engine start ECU and the certification ECU (smart key ECU assembly) is established and the remote engine start is operated, this DTC and the corresponding history DTC will be cleared.

HINT:

*: Registration status of the remote engine start ECU ID can be checked using the "Wireless C Code" item in the Data List.


DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2779 Engine Starter Communication Malfunction When the remote engine start is operated to try to turn the power source on, or start the engine, the remote start function tries to communicate with the certification ECU (smart key ECU assembly), but communication fails. (1 trip detection logic*)
·

CAN communication system

·

Remote start ECU (genuine part)

·

Main body ECU (multiplex network body ECU)

·

Certification ECU (smart key ECU assembly)


DTC output confirmation operation:

Always



*: Only detected while a malfunction is present.


Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
The engine cannot be started with a remote start operation The engine cannot be started with a remote start operation only

Related Data List and Active Test
DTC No. Data List and Active Test
B2779
Entry&Start
·

Wireless Starter Com ID

·

Wireless C Code



CAUTION / NOTICE / HINT

NOTICE:
·

When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

·

The entry and start system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>ENTRY AND START SYSTEM (for Start Function)>HOW TO PROCEED WITH TROUBLESHOOTING

·

Before replacing the certification ECU (smart key ECU assembly) or main body ECU (multiplex network body ECU), refer to the Service Bulletin.

·

After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".



PROCEDURE

2.READ VALUE USING GTS (WIRELESS C CODE)
a.

Connect the GTS to the DLC3.


b.

Turn the engine switch on (IG).


c.

Turn the GTS on.


d.

Enter the following menus: Body Electrical / Entry&Start / Data List.


e.

Read the Data List according to the display on the GTS.

Body Electrical > Entry&Start > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Wireless C Code Registration status between remote engine starter ECU and certification ECU (smart key ECU assembly) No Regd or Regd No Regd: Remote starter ID not registered to remote engine start ECU and certification ECU (smart key ECU assembly)
Regd: Remote starter ID registered to remote engine start ECU and certification ECU (smart key ECU assembly) 		Problems may be caused by the following:
·

DTC B2779 is stored.

·

Remote engine start ECU registration has not been performed.

·

The certification ECU (smart key ECU assembly) or remote engine start ECU is malfunctioning.


Body Electrical > Entry&Start > Data List
Tester Display
Wireless C Code
50003 125 44

Result:
Result Proceed to
"No Regd" is displayed on the GTS A
"Regd" is displayed on the GTS B



A

3.REGISTER REMOTE ENGINE STARTER ID

B

5.CHECK REMOTE ENGINE STARTER ECU
3.REGISTER REMOTE ENGINE STARTER ID
a.

Register the remote engine starter ID.

HINT:

Refer to the Service Bulletin.



Result:
Proceed to
NEXT



NEXT

4.CHECK REMOTE ENGINE STARTER FUNCTION
4.CHECK REMOTE ENGINE STARTER FUNCTION
a.

Check the remote engine starter function.

OK:

Remote engine starter functions operate normally.



Result:
Proceed to
OK
NG



OK

END (REMOTE ENGINE STARTER ID WAS NOT REGISTERED)

NG

5.CHECK REMOTE ENGINE STARTER ECU
5.CHECK REMOTE ENGINE STARTER ECU
a.

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


b.

Register the remote engine starter ID.

HINT:

Refer to the Service Bulletin.



c.

Check the remote engine starter function.

OK:

Remote engine starter functions operate normally.



Result:
Proceed to
OK
NG



OK

END (REMOTE ENGINE STARTER ECU WAS DEFECTIVE)

NG

6.CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
6.CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
a.

Replace the main body ECU (multiplex network body ECU) with a new one.

for LHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for LHD)>REMOVAL

for RHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for RHD)>REMOVAL



b.

Check the remote engine starter function.

OK:

Remote engine starter functions operate normally.



Result:
Proceed to
OK
NG



OK

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

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)