Toyota Corolla (E120) 2002–2008 Repair Manual / Diagnostics / Power door lock control system / Key confinement prevention function does not work properly (unlock warning switch circuit)

Toyota Corolla (E120): Key confinement prevention function does not work properly (unlock warning switch circuit)

Circuit description

The unlock warning switch turns on when the key is inserted in the ignition key cylinder and the door courtesy switch turns on when the driver’s door is opened, and the integration relay monitors both switches conditions.

According to these switches conditions, the integration relay controls the door locking operation not to lock the doors while both switches are on, in order to prevent the key from being confined.

Wiring diagram

Inspection procedure

Inspection procedure

1 Inspect un–lock warning switch assy

  1. Remove the un–lock warning switch assy.
  2.  inspect the un–lock warning switch assy continuity, as shown in the illustration and table.

Standard:

2 Check wire harness

2 Check wire harness (un–lock warning switch  instrument panel j/b)

  1. Disconnect the un–lock warning switch assy and instrument panel j/b connectors.
  2.  check the continuity between the terminals of the un–lock warning switch assy and instrument panel j/b connectors, as shown in the illustration and table.

    Standard (check for open):

3 Inspect front door courtesy lamp switch assy (driver’s side)

3 Inspect front door courtesy lamp switch assy (driver’s side)

  1. Remove the courtesy lamp switch.
  2. inspect the courtesy lamp switch continuity, as shown in the illustration and table.

Standard:

4 Check wire harness

4 Check wire harness (front door courtesy lamp switch assy [driver’s side]  instrument panel j/b)

  1. Disconnect the courtesy lamp switch and instrument panel j/b connectors.
  2. check the continuity between the terminals of the courtesy lamp switch and instrument panel j/b connectors, as shown in the illustration and table.

Standard (check for open):

Replace integration relay

Replace integration relay

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