IMMOBILISER SYSTEM(w/o Entry and Start System), Diagnostic DTC:B2796

DTC Code DTC Name
B2796 No Communication in Immobiliser System

DESCRIPTION

This DTC is stored when a key is inserted into the ignition key cylinder but no communication occurs between the key and transponder key ECU assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B2796

No Communication in Immobiliser System

The key ID code cannot be transmitted to the transponder key ECU assembly (1 trip detection logic*).

  • Key

  • Harness or connector

  • Transponder key coil

  • Transponder key ECU assembly

  • DTC Output Confirmation Operation:

  • Insert the key into the ignition key cylinder

  • *: Only output while a malfunction is present.

Table 1. Vehicle Condition and Fail-safe Operation when Malfunction Detected

Vehicle Condition when Malfunction Detected

Fail-safe Operation when Malfunction Detected

Engine cannot be started

-
Table 2. Related Data List and Active Test

DTC No.

Data List and Active Test

B2796

-

WIRING DIAGRAM

B329324E12

CAUTION / NOTICE / HINT

Note:

  • If the transponder key ECU assembly or key is replaced, refer to the Service Bulletin.

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

  • When using the GTS with the vehicle ignition switch off, connect the GTS to the vehicle 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 the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Immobiliser. 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.

PROCEDURE

  1. CLEAR DTC

    1. Clear the DTCs.

      Click hereClick here

      Body Electrical > Immobiliser > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  2. CHECK FOR DTC

    1. Insert and remove each registered key one at a time, and check for DTCs each time.

      Click hereClick here

      Body Electrical > Immobiliser > Trouble Codes

      Tip:

      Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

    Result

    Proceed to

    DTC B2796 is not output

    DTC B2796 is output for all of the keys

    DTC B2796 is output for any of the keys
    DTC B2796 is not output

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick hereClick hereClick hereClick here

    DTC B2796 is output for any of the keys

    REPLACE KEYClick here

    DTC B2796 is output for all of the keys

  3. REPLACE TRANSPONDER KEY ECU ASSEMBLY

    1. Replace the transponder key ECU assembly with a new one.

      Tip:

      Refer to the Service Bulletin.

      Note:

      Key ID code registration is necessary when replacing the transponder key ECU assembly.

      Refer to the Service Bulletin.

    Result

    Proceed to

    NEXT
    NEXT

  4. CLEAR DTC

    1. Clear the DTCs.

      Click hereClick here

      Body Electrical > Immobiliser > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  5. CHECK FOR DTC

    1. Check for DTCs.

      Click hereClick here

      Body Electrical > Immobiliser > Trouble Codes

      Tip:

      Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

    Result

    Proceed to

    B2796 is not output

    B2796 is output
    B2796 is not output

    END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)

    B2796 is output

    REPLACE KEY FOR WHICH DTC WAS OUTPUT

  6. REPLACE KEY

    1. Replace the key for which the DTC was stored.

      Note:

      Key ID code registration is necessary when replacing the key.

      Refer to the Service Bulletin.

    Result

    Proceed to

    NEXT
    NEXT

  7. CLEAR DTC

    1. Clear the DTCs.

      Click hereClick here

      Body Electrical > Immobiliser > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  8. CHECK FOR DTC

    1. Check for DTCs.

      Click hereClick here

      Body Electrical > Immobiliser > Trouble Codes

      Tip:

      Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

    Result

    Proceed to

    B2796 is not output

    B2796 is output
    B2796 is not output

    END (KEY WAS DEFECTIVE)

    B2796 is output

    REPLACE TRANSPONDER KEY ECU ASSEMBLY