Dtc B2780 Push Switch / Key Unlock Warning Switch Malfunction

Securities. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Engine Immobiliser. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (UNLOCK WARNING SWITCH)

INSPECT UNLOCK WARNING SWITCH ASSEMBLY

CHECK WIRE HARNESS (UNLOCK WARNING SWITCH - BODY GROUND)

CHECK WIRE HARNESS (UNLOCK WARNING SWITCH - TRANSPONDER KEY ECU)

DTC B2780 Push Switch / Key Unlock Warning Switch Malfunction


DESCRIPTION

This DTC is 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 Code
DTC Detection Condition
Trouble Area
B2780
Unlock warning switch ON is not detected when ignition switch is ON
  1. Transponder key ECU
  2. Unlock warning switch
  3. Wire harness

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Engine Immobiliser.Engine Immobiliser System (W/ Entry And Start System). Dtc B2780 Push Switch / Key Unlock Warning Switch Malfunction


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (UNLOCK WARNING SWITCH)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON with a key that cannot start the engine.

  1. On the intelligent tester, enter the following menus: Body / Immobiliser / Data List / Key SW. Read the result.

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


OK
REPLACE TRANSPONDER KEY ECU
NG


2.INSPECT UNLOCK WARNING SWITCH ASSEMBLY
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Engine Immobiliser.Engine Immobiliser System (W/ Entry And Start System). Dtc B2780 Push Switch / Key Unlock Warning Switch Malfunction

  1. Remove the unlock warning switch.

  1. Measure the resistance of the switch.

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


NG
REPLACE UNLOCK WARNING SWITCH ASSEMBLY
OK


3.CHECK WIRE HARNESS (UNLOCK WARNING SWITCH - BODY GROUND)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Engine Immobiliser.Engine Immobiliser System (W/ Entry And Start System). Dtc B2780 Push Switch / Key Unlock Warning Switch Malfunction

  1. Disconnect the E9 switch connector.

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

    Standard Resistance:
    Tester Connection
    		Specified Condition
    E9-2 - Body ground
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


4.CHECK WIRE HARNESS (UNLOCK WARNING SWITCH - TRANSPONDER KEY ECU)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Engine Immobiliser.Engine Immobiliser System (W/ Entry And Start System). Dtc B2780 Push Switch / Key Unlock Warning Switch Malfunction

  1. Disconnect the E9 switch connector.

  1. Disconnect the E50 ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Specified Condition
    E9-1 - E50-3 (KSW)
    		Below 1 Ω
    E9-1 or E50-3 (KSW) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE TRANSPONDER KEY ECU