1.CHECK DOOR SWITCH INPUT SIGNAL

1. Turn ignition switch OFF.
2. Disconnect malfunctioning door switch connector.
3. Check signal between malfunctioning door switch harness connector and ground using oscilloscope.

   (+) | (–) | Signal (Reference value)
   Door switch
   Connector | Terminal
   Driver side | B21 | 2 | Ground |
   Passenger side | B221 | 2 |

Is the inspection result normal?
YES>>GO TO 3.
NO>>GO TO 2.
2.CHECK DOOR SWITCH CIRCUIT

1. Disconnect BCM connector.
2. Check continuity between BCM harness connector and door switch harness connector.

   Door switch | BCM | Continuity
   Connector | Terminal | Connector | Terminal
   Driver side | B21 | 2 | M123 | 150 | Existed
   Passenger side | B221 | 124

3. Check continuity between door switch harness connector and ground.

   Door switch | Ground | Continuity
   Connector | Terminal
   Driver side | B21 | 2 | Not existed
   Passenger side | B221

Is the inspection result normal?
YES>>Replace BCM. Refer to Removal and Installation.
NO>>Repair or replace harness.
3.CHECK DOOR SWITCH
Refer to Component Inspection.
Is the inspection result normal?
YES>>GO TO 4.
NO>>Replace malfunctioning door switch. Refer to Removal and Installation.
4.CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident.
>>INSPECTION END