Dtc B2780 Push Switch / Key Unlock Warning Switch Malfunction

Vehicle Interior. Yaris. Ncp93, 131
Theft Deterrent Keyless Entry. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM

INSPECT UNLOCK WARNING SWITCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH ASSEMBLY - BODY GROUND)

CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - UNLOCK WARNING SWITCH ASSEMBLY)

DTC B2780 Push Switch / Key Unlock Warning Switch Malfunction


DESCRIPTION

This DTC will be output if the transponder key ECU does not detect that the unlock warning switch is ON even when the ignition switch is ON. Under normal conditions, the unlock warning switch is ON when the ignition switch is ON.

DTC No.
DTC Detection Condition
Trouble Area
B2780
Unlock warning switch ON is not detected when ignition switch is ON
  1. Unlock warning switch assembly
  2. Wire harness
  3. Transponder key ECU assembly

WIRING DIAGRAM


Yaris. Ncp93, 131.Theft Deterrent Keyless Entry.Engine Immobiliser System (For Sedan). Dtc B2780 Push Switch / Key Unlock Warning Switch Malfunction


INSPECTION PROCEDURE

1.READ VALUE USING TECHSTREAM

  1. Connect a Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Enter the following menus: Body Electrical / Immobiliser / Data List.

  1. According to the display on tester, read the "Data List".


Immobiliser:
Tester Display
Measurement Item/Range
Normal Condition
Diagnostic Note
Key SW
Unlock warning switch signal/
ON or OFF
OFF: No key is in ignition key cylinder
ON: Key is in ignition key cylinder
-
OK:
"ON" (key is in ignition key cylinder) appears on the screen.


NG
Go to step 2
OK

REPLACE TRANSPONDER KEY ECU ASSEMBLY (YARIS_NCP93 RM000003BHZ005X.html)

2.INSPECT UNLOCK WARNING SWITCH ASSEMBLY


    Yaris. Ncp93, 131.Theft Deterrent Keyless Entry.Engine Immobiliser System (For Sedan). Dtc B2780 Push Switch / Key Unlock Warning Switch Malfunction

  1. Remove the unlock warning switch assembly.

  1. Measure the resistance of the switch.

    Standard resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    1 - 2
    		Pushed
    		Below 1 Ω
    1 - 2
    		Not pushed
    		10 kΩ or higher

  1. Reinstall the unlock warning switch assembly.



NG
REPLACE UNLOCK WARNING SWITCH ASSEMBLY (YARIS_NCP93 RM000001GD401DX.html)
OK


3.CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH ASSEMBLY - BODY GROUND)


    Yaris. Ncp93, 131.Theft Deterrent Keyless Entry.Engine Immobiliser System (For Sedan). Dtc B2780 Push Switch / Key Unlock Warning Switch Malfunction

  1. Disconnect the D19 Unlock warning switch assembly connector.

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    D19-2 - Body ground
    		Below 1 Ω

  1. Reconnect the D19 unlock warning switch assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - UNLOCK WARNING SWITCH ASSEMBLY)
Yaris. Ncp93, 131.Theft Deterrent Keyless Entry.Engine Immobiliser System (For Sedan). Dtc B2780 Push Switch / Key Unlock Warning Switch Malfunction

  1. Disconnect the D23 transponder key ECU connector.

  1. Disconnect the D19 unlock warning switch assembly connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    D23-3 (KSW) - D19-1
    		Below 1 Ω

  1. Reconnect the D23 transponder key ECU connector.

  1. Reconnect the D19 unlock warning switch assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE TRANSPONDER KEY ECU ASSEMBLY (YARIS_NCP93 RM000003BHZ005X.html)