DTC    B2780    Push Switch / Key Unlock Warning Switch Malfunction

for Preparation Click here


DESCRIPTION

This DTC will be stored 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. Wire harness or connector
  2. Unlock warning switch
  3. Transponder key ECU

WIRING DIAGRAM


B151009E16


INSPECTION PROCEDURE

NOTICE:
If the transponder key ECU is replaced, register the key and ECU - ECM communication ID.

1.READ VALUE USING INTELLIGENT TESTER (KEY SWITCH)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

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


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.



NG
Go to step 2
OK

REPLACE TRANSPONDER KEY ECU 

2.INSPECT UNLOCK WARNING SWITCH


    B215587E01

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

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

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

  1. Reinstall the unlock warning switch.
    Text in Illustration 
    *1
    		Component without harness connected
    (Unlock Warning Switch)



NG
REPLACE UNLOCK WARNING SWITCH (Click here)
OK


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

  1. Disconnect the D18 unlock warning switch connector.



    B215588E01

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D18-1 - Body ground
    		Always
    		Below 1 Ω

  1. Reconnect the unlock warning switch connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Unlock Warning Switch)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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


    B215589E01

  1. Disconnect the D29 transponder key ECU connector.

  1. Disconnect the D18 unlock warning switch connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D29-3 (KSW) - D18-2
    		Always
    		Below 1 Ω
    D18-1 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the transponder key ECU connector.

  1. Reconnect the unlock warning switch connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Unlock Warning Switch)
    *2
    		Front view of wire harness connector
    (to Transponder Key ECU)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE TRANSPONDER KEY ECU