B1222

DTC B1222 Driver Side Door Lock Switch Circuit Malfunction

DESCRIPTION
This DTC notifies how the switch works as follows:
If the DTC is not output when operating the switch, this means there is a failure of the switch contact. If the DTC is output when not operating the switch, this means the switch is stuck. When a malfunction is found using this diagnosis, inspect each switch. Then, replace the switch if there is a problem, or check the wire harness if there is no problem.

DTC Detection Condition:

HINT: Refer to switch inspection.

Door Control Switch

1. INSPECT POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY

a. Check the continuity of the power window regulator master switch.

If the result is not as specified, replace the switch assembly.

2. INSPECT POWER WINDOW REGULATOR SWITCH ASSEMBLY

a. Check the continuity of the power window regulator switch.

If the result is not as specified, replace the switch assembly.

Front Door Lock

1. INSPECT DOOR UNLOCK DETECTION SWITCH

a. Check the continuity of the door unlock detection switch.

If the result is not as specified, replace the door lock assembly.

2. INSPECT DOOR LOCK MOTOR OPERATION
a. Connect the battery positive (+) lead to terminal 3 and the battery negative (-) lead to terminal 2, and check that the door lock link moves to the UNLOCK position.

b. Reverse the polarity and check that the door lock link moves to the LOCK position. If the operation is not as specified, replace the door lock assembly.

3. INSPECT PTC THERMISTOR OPERATION (Using an ammeter)
a. Connect the battery negative (-) lead to terminal 2.
b. Connect the ammeter negative (-) lead to terminal 3 and the ammeter positive (+) lead to the battery positive (+) terminal, and check that the current changes from approximately 3.2 A to less than 0.5 A within 20 to 70 seconds.

c. Disconnect the leads from the terminals.
d. Approximately 60 seconds later, connect the battery positive (+) lead to terminal 2 and the battery negative (-) lead to terminal 3, and check that the door lock moves to the LOCK position. If the operation is not as specified, replace the door lock assembly.

4. INSPECT PTC THERMISTOR OPERATION (Using an ammeter with a current-measuring probe)
a. Connect the battery positive (+) lead to terminal 3 and the battery negative (-) lead to terminal 2.
b. Attach a current-measuring probe to either the positive (+) lead or the negative (-) lead, and check that the current changes from approximately 3.2 A to less than 0.5 A within 20 to 70 seconds.

c. Disconnect the leads from the terminals.
d. Approximately 60 seconds later, reverse the polarity, and check that the door lock moves to the LOCK position.

If the operation is not as specified, replace the door lock assembly.

Rear Door Lock

1. INSPECT DOOR UNLOCK DETECTION SWITCH

a. Check the continuity of the door unlock detection switch.

If the result is not as specified, replace the door lock assembly.

b. Reverse the polarity and check that the door lock link moves to the LOCK position. If the operation is not as specified, replace the door lock assembly.

c. Disconnect the leads from the terminals.
d. Approximately 60 seconds later, connect the battery positive (+) lead to terminal 2 and the battery negative (-) lead to terminal 3, and check that the door lock moves to the LOCK position.

If the operation is not as specified, replace the door lock assembly.

1. INSPECT DOOR UNLOCK DETECTION SWITCH

a. Check the continuity of the door unlock detection switch.

If the result is not as specified, replace the door lock assembly.

b. Reverse the polarity and check that the door lock link moves to the LOCK position.

If the operation is not as specified, replace the door lock assembly.

c. Disconnect the leads from the terminals.
d. Approximately 60 seconds later, connect the battery positive (+) lead to terminal 2 and the battery negative (-) lead to terminal 3, and check that the door lock moves to the LOCK position. If the operation is not as specified, replace the door lock assembly.