DTC B2779: Engine Starter Communication Malfunction [08/2015 - ]: Procedure

1. Clear the DTC. Refer to DTC CHECK / CLEAR [08/2015 - ] .
2. Perform the remote engine start operation.
3. Check for DTCs.

   OK

   DTC B126A is not output.

NG → See step   13 

OK: Go to next step 

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus: Body Electrical / Smart Key / Data List.
6. According to the display on the Techstream, read the Data List.
   SMART KEY (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))
   
   

   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: ID not registered between remote engine starter ECU and certification ECU (smart key ECU assembly) Regd: ID registered between remote engine starter ECU and certification ECU (smart key ECU assembly)	-

   Result

   Result	Proceed to
   "No Regd" appears on the Techstream screen	A
   "Regd" appears on the Techstream screen	B

B → See step   5 

A: Go to next step 

1. Register the remote engine starter ID. Refer to REGISTRATION [08/2015 - ] .

NEXT: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR [08/2015 - ] .
2. Perform the remote engine start operation.
3. Check for DTCs.

   OK

   DTC B2779 is not output.

NG → See step   7 

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

1. Disconnect the I141 remote engine starter ECU connector.
2. Measure the voltage and resistance according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   I141-10 (R+B) - Body ground	Always	11 to 14 V
   I141-1 (RSIG) - Body ground	Engine switch on (IG)	11 to 14 V
   I141-1 (RSIG) - Body ground	Engine switch off	Below 1 V

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I141-19 (RGN1) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the I13 main body ECU (multiplex network body ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I13-25 (BTX) - I141-4 (BTX)	Always	Below 1 Ω
   I13-26 (BRX) - I141-3 (BRX)	Always	Below 1 Ω
   I13-25 (BTX) - Body ground	Always	10 kΩ or higher
   I13-26 (BRX) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Temporarily replace the remote engine starter ECU with a new one. Refer to REMOVAL [08/2015 - ] .

NEXT: Go to next step 

1. Register the remote engine starter ID. Refer to REGISTRATION [08/2015 - ] .

NEXT: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR [08/2015 - ] .
2. Perform the remote engine start operation.
3. Check for DTCs.

   OK

   DTC B2779 is not output.

NG → See step   10 

OK → END (REMOTE ENGINE STARTER ECU WAS DEFECTIVE) 

1. Temporarily replace the main body ECU (multiplex network body ECU) with a new one. Refer to REMOVAL [08/2015 - ] .

NEXT: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR [08/2015 - ] .
2. Perform the remote engine start operation.
3. Check for DTCs.

   OK

   DTC B2779 is not output.

NG → See step   12 

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