DTC    B2796    No Communication in Immobiliser System

for Preparation Click here


DESCRIPTION

These DTCs are stored if a key that does not have a transponder chip is inserted into the ignition key cylinder or if communication between the key and transponder key ECU is impossible.

DTC No.
DTC Detection Condition
Trouble Area
B2796
  1. A key without an ID code (without a communication IC chip) is inserted in to the ignition key cylinder.
  2. Communication is not established within about 20 seconds after the key is inserted.
  1. Key
  2. Transponder key amplifier
  3. Transponder key ECU
  4. Wire harness or connector

WIRING DIAGRAM


B164252E17


INSPECTION PROCEDURE

NOTICE:
  1. If the transponder key ECU is replaced, register the key and ECU - ECM communication ID.
  2. If the key is replaced, register the key.

1.CHECK WHETHER ENGINE STARTS WITH OTHER KEYS

  1. Check if the engine starts with an already registered vehicle key.

OK:
Engine starts.



NG
Go to step 2
OK

RE-REGISTER OR REPLACE KEY THAT CANNOT START ENGINE 

2.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)
B203485E02

  1. Disconnect the D29 transponder key ECU connector.

  1. Disconnect the D31 transponder key amplifier connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D29-4 (TXCT) - D31-5 (TXCT)
    		Always
    		Below 1 Ω
    D29-5 (AGND) - D31-7 (AGND)
    		Always
    		Below 1 Ω
    D29-14 (VC5) - D31-1 (VC5)
    		Always
    		Below 1 Ω
    D29-15 (CODE) - D31-4 (CODE)
    		Always
    		Below 1 Ω
    D29-4 (TXCT) - Body ground
    		Always
    		10 kΩ or higher
    D29-5 (AGND) - Body ground
    		Always
    		10 kΩ or higher
    D29-14 (VC5) - Body ground
    		Always
    		10 kΩ or higher
    D29-15 (CODE) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the amplifier and ECU connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Transponder Key ECU)
    *2
    		Front view of wire harness connector
    (to Transponder Key Amplifier)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.REPLACE TRANSPONDER KEY AMPLIFIER

  1. Replace the transponder key amplifier (Click here).


NEXT


4.CLEAR DTC

  1. Clear the DTC (Click here).


NEXT


5.CHECK FOR DTC

  1. Check for DTC (Click here).

    OK:
    DTC is not output.



NG
REPLACE TRANSPONDER KEY ECU
OK

END (TRANSPONDER KEY AMPLIFIER IS DEFECTIVE)