THEFT DETERRENT / KEYLESS ENTRY  IMMOBILISER SYSTEM(w/o Smart Entry and Start System)  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.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2780 Push Switch / Key Unlock Warning Switch Malfunction The unlock warning switch assembly is not detected as being on when the ignition switch is ON (1 trip detection logic*).
·

Wire harness or connector

·

Unlock warning switch assembly

·

Transponder key ECU assembly


DTC Output Confirmation Operation:

Insert the door control transmitter assembly 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 No. Data List and Active Test
B2780 Key SW

WIRING DIAGRAM

B278950E30
2.167,0.99 4.292,1.344 2.125,0.354 10 false Unlock Warning Switch Assembly 2.167,0.823 2.479,1.063 0.313,0.24 10 false E5 5.375,1.792 6.813,2.323 1.438,0.531 10 false Transponder Key ECU Assembly 5.375,1.635 5.865,2.031 0.49,0.396 10 false E99 5.646,0.542 6,0.698 0.354,0.156 10 false KSW 5.479,0.469 5.604,0.625 0.125,0.156 10 false 3 3.74,0.458 3.865,0.615 0.125,0.156 10 false 1 2.5,0.458 2.625,0.615 0.125,0.156 10 false 2

CAUTION / NOTICE / HINT

NOTICE:
·

If the transponder key ECU assembly is replaced, refer to Service Bulletin.

·

After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".



PROCEDURE

1.CLEAR DTC
a.

Clear the DTCs.

Body Electrical > Immobiliser > Clear DTCs
50002 260

Result:
Proceed to
NEXT



NEXT

2.CHECK FOR DTC
2.CHECK FOR DTC
a.

Perform "DTC Output Confirmation Operation" procedure.


b.

Check for DTCs.

Body Electrical > Immobiliser > Trouble Codes
50001 260
OK:

DTC B2780 is not output.



Result:
Result Proceed to
B2780 is not output A
B2780 is output B



A

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


B

3.INSPECT UNLOCK WARNING SWITCH ASSEMBLY
3.INSPECT UNLOCK WARNING SWITCH ASSEMBLY
a.

Remove the unlock warning switch assembly.

Click hereVehicle Interior>DOOR LOCK>UNLOCK WARNING SWITCH>REMOVAL


b.

Inspect the unlock warning switch assembly.

Click hereVehicle Interior>DOOR LOCK>UNLOCK WARNING SWITCH>INSPECTION


Result:
Proceed to
OK
NG



OK

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

NG

REPLACE UNLOCK WARNING SWITCH ASSEMBLY

Click hereVehicle Interior>DOOR LOCK>UNLOCK WARNING SWITCH>REMOVAL


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

Disconnect the E99 transponder key ECU assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
E5-1 - E99-3 (KSW) Always Below 1 Ω
E5-2 - Body ground Always Below 1 Ω
E5-1 or E99-3 (KSW) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE TRANSPONDER KEY ECU ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR