Key Lock-In Prevention Function Does Not Work Properly

DOOR LOCK: POWER DOOR LOCK CONTROL SYSTEM: Key Lock-in Prevention Function does not Work Properly
- Key Lock-in Prevention Function does not Work Properly

DESCRIPTION

The transponder key ECU uses the unlock warning switch to detect when the key is in the ignition key cylinder, and transmits the detection as a signal to the theft warning ECU. When the door is locked with the ignition switch OFF and the key in the ignition key cylinder, the theft warning ECU transmits the LOCK signal. Then the UNLOCK signal is sent to the multiplex network door ECU front LH and RH. After those operations, the multiplex network front door ECU LH and RH drive the door lock motor.

WIRING DIAGRAM





INSEPCTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (UNLOCK WARNING SWITCH)

(a) Check the DATA LIST for proper functioning of the unlock warning switch.

Immobiliser





OK:

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

NG -- CHECK WIRE HARNESS (SWITCH - ECU)
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (COURTESY SWITCH)

(a) Check the DATA LIST for proper functioning of the courtesy switch.

Driver Door





NG -- CHECK WIRE HARNESS (DOOR COURTESY LIGHT - DOOR ECU)

OK -- REPLACE MULTIPLEX NETWORK FRONT DOOR ECU LH

3. CHECK WIRE HARNESS (DOOR COURTESY LIGHT - DOOR ECU)

(a) Disconnect the D8 switch connector.





(b) Disconnect the D21 ECU connector.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY LH

(a) Measure the resistance of the switch.





Standard resistance:





NG -- REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY LH

OK -- REPLACE MULTIPLEX NETWORK FRONT DOOR ECU LH

5. INSPECT UNLOCK WARNING SWITCH

(a) Remove the unlock warning switch.





(b) Measure the resistance of the switch.

Standard resistance:





NG -- REPLACE UNLOCK WARNING SWITCH ASSEMBLY
OK -- Continue to next step.

6. CHECK WIRE HARNESS (SWITCH - ECU)





(a) Disconnect the U1 switch connector.

(b) Disconnect the T13 ECU connector.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE TRANSPONDER KEY ECU