DTC    B2780    Push Switch / Key Unlock Warning Switch Malfunction

for Preparation Click here


DESCRIPTION

This DTC will be output if the transponder key ECU assembly does not detect that the unlock warning switch 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 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


B128326E03


INSPECTION PROCEDURE

NOTICE:
If the transponder key ECU assembly is replaced, register the key and ECU communication ID.
1.READ VALUE USING INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to the ON position and turn the intelligent tester main switch on.

  1. Select Key SW in the DATA LIST and read the value displayed on the tester.

    IMMOBILISER: 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Key SW
    		Unlock warning switch signal/ON or OFF
    		OFF: Key is in ignition key cylinder
    ON: No key is in ignition key cylinder
    		-

    OK:
    ON (Key is in ignition key cylinder) appears on the screen.


OK
REPAIR OR REPLACE HARNESS OR CONNECTOR
NG


2.INSPECT UNLOCK WARNING SWITCH ASSEMBLY


    B118535E02

  1. Remove the unlock warning switch assembly (Click here).

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

    Standard resistance:
    Tester Connection
    		Switch Position
    		Specified Condition
    1 - 2
    		Switch pushed
    (Key set)
    		Below 1 Ω
    Switch free
    (Key removed)
    		10 kΩ or higher


NG
REPLACE UNLOCK WARNING SWITCH ASSEMBLY (Click here)
OK


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


    B124194E02

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E22-2 - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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


    B128340E02

  1. Disconnect the E15 ECU connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E15-3 (KSW) - E22-1
    		Always
    		Below 1 Ω
    E22-1 - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE TRANSPONDER KEY ECU ASSEMBLY