Test No. 4: Front Door Switch Input Circuit)

When the front door is closed (the door switch is switched OFF), HIGH-level signals are sent to the ECU; when the front door is opened (the door switch is switched ON), LOW-level signals are sent to the ECU. See Fig 1 .

Fig 1: Test No. 4: Front Door Switch Input

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.