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

Toyota Corolla Repair Manual / Diagnostics / Power door lock control system / 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 drivers 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 unlock warning switch assy

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

Standard:

2 Check wire harness

2 Check wire harness (unlock warning switch  instrument panel j/b)

  1. Disconnect the unlock warning switch assy and instrument panel j/b connectors.
  2.  check the continuity between the terminals of the unlock 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 (drivers side)

3 Inspect front door courtesy lamp switch assy (drivers 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 [drivers 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

Inspection procedure
1 Check door lock When the door does not operate manually, proceed to a.  when the door does not operate via the key, proceed to b. 2 Inspect door lock control switch W/ ...

Wireless door lock control system
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Other materials:

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