B2780
ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B2780: Push Switch / Key Unlock Warning Switch Malfunction
DTC B2780 - Push Switch / Key Unlock Warning Switch Malfunction
DESCRIPTION
This DTC will be output 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.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. READ VALUE USING TECHSTREAM
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester on.
(d) Enter the following menus: Body Electrical / Immobiliser / Data List.
(e) According to the display on tester, read the "Data List".
Immobiliser:
OK:
"ON" (key is in ignition key cylinder) appears on the screen.
NG -- INSPECT UNLOCK WARNING SWITCH ASSEMBLY
OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
2. INSPECT UNLOCK WARNING SWITCH ASSEMBLY
(a) Remove the unlock warning switch assembly.
(b) Measure the resistance of the switch.
Standard resistance:
(c) Reinstall the unlock warning switch assembly.
NG -- REPLACE UNLOCK WARNING SWITCH ASSEMBLY
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH ASSEMBLY - BODY GROUND)
(a) Disconnect the D19 Unlock warning switch assembly connector.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:
(c) Reconnect the D19 unlock warning switch assembly connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - UNLOCK WARNING SWITCH ASSEMBLY)
(a) Disconnect the D23 transponder key ECU connector.
(b) Disconnect the D19 unlock warning switch assembly connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:
(d) Reconnect the D23 transponder key ECU connector.
(e) Reconnect the D19 unlock warning switch assembly connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY