DTC B2780 Push Switch / Key Unlock Warning Switch Malfunction

DESCRIPTION

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

DTC Code	DTC Detection Condition	Trouble Area	DTC Output Confirmation Operation
B2780	The unlock warning switch assembly is not detected as being on when the ignition switch is ON (1 trip detection logic*).	Transponder key ECU assembly Unlock warning switch assembly Harness or connector	Insert the key into the ignition key cylinder.

*: Only output while a malfunction is present.

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected	Fail-safe Operation when Malfunction Detected
Engine cannot be started	-

Related Data List and Active Test
DTC Code	Data List and Active Test
B2780	Key SW

WIRING DIAGRAM

Dtc B2780 Push Switch / Key Unlock Warning Switch Malfunction. THEFT DETERRENT / KEYLESS ENTRY. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

NOTICE:

When replacing the transponder key ECU assembly, refer to the Service Bulletin.

After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

1.CLEAR DTC

Clear the DTCs ().

NEXT

2.CHECK FOR DTC

Check for DTCs ().

HINT:

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

OK:
DTC B2780 is not output.

NG

Go to step 3

OK

USE SIMULATION METHOD TO CHECK ()

3.INSPECT UNLOCK WARNING SWITCH ASSEMBLY

Inspect the unlock warning switch assembly ().

NG

REPLACE UNLOCK WARNING SWITCH ASSEMBLY ()

OK

4.CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH ASSEMBLY - TRANSPONDER KEY ECU ASSEMBLY AND BODY GROUND)

Disconnect the E94 unlock warning switch assembly connector.

Disconnect the E96 transponder key ECU assembly connector.

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

Standard Resistance:
Tester Connection Condition Specified Condition
E94-1 (UN+) - E96-3 (KSW) Always Below 1 Ω
E94-2 (UN-) - Body ground Always Below 1 Ω
E94-1 (UN+) - Body ground Always 10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

REPLACE TRANSPONDER KEY ECU ASSEMBLY

THEFT DETERRENT / KEYLESS ENTRY

Land Cruiser URJ200 URJ202 GRJ200 VDJ200

ENGINE IMMOBILISER SYSTEM w/o Entry and Start System

Tester Connection	Condition	Specified Condition
E94-1 (UN+) - E96-3 (KSW)	Always	Below 1 Ω
E94-2 (UN-) - Body ground	Always	Below 1 Ω
E94-1 (UN+) - Body ground	Always	10 kΩ or higher