DTC B2780 Push Switch / Key Unlock Warning Switch Malfunction |
for Preparation Click here
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*). |
| Insert the key into the ignition key cylinder. |
- *: Only output while a malfunction is present.
Vehicle Condition when Malfunction Detected | Fail-safe Operation when Malfunction Detected |
Engine cannot be started. | - |
DTC Code | Data List and Active Test |
B2780 | Key SW |
WIRING DIAGRAM
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 (Click here).
NEXT | |
2.CHECK FOR DTC |
Check for DTCs (Click here).
- OK:
- DTC B2780 is not output.
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OK | ||
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3.INSPECT UNLOCK WARNING SWITCH ASSEMBLY |
Remove the unlock warning switch assembly.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Switch Condition Specified Condition 1 - 2 Pushed Below 1 Ω Not pushed 10 kΩ or higher
Text in Illustration *a Pushed *b Not pushed
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OK | |
4.CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH - TRANSPONDER KEY ECU AND BODY GROUND) |
Disconnect the U1 unlock warning switch assembly connector.
Disconnect the T21 transponder key ECU assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition U1-1 - T21-3 (KSW) Always Below 1 Ω U1-1 or T21-3 (KSW) - Body ground Always 10 kΩ or higher U1-2 - Body ground Always Below 1 Ω
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OK | ||
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