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Car Forum / Nissan / Nissan Cars / May 2005power lock breaks down when connected to alarm
Hi all, I just replaced the motor for the power lock on the driver side, which worked fo about an hour... Now it seems like the current was to high and theres no motion at all, like its melted or something. (had a real hard time unlocking the door...) Does anyone know what might cause this? I drive a 1992 Maxima 3.0E (european model) >Hi all, > [quoted text clipped - 6 lines] > >I drive a 1992 Maxima 3.0E (european model) The door lock timer operates the door lock motor for a timed period - about 1 sec. Most alarm systems just apply power and expect the door lock motor to have a limit switch that cuts the power when it has operated. If you keep power applied on a Nissan lock motor it will burn out. improperly wired into the system, the motor itself would determine the amount of current it consumed Current = watts/volts I=P/E current = volts over resistance I=E/R the car has 12 volts, the motor has a set resistance,, that's all the current it can consume. > Hi all, > [quoted text clipped - 6 lines] > > I drive a 1992 Maxima 3.0E (european model) The power door lock actuator is nothing more than a solenoid. These solenoid type actuators are only designed for intermittent duty. Sounds like yours was energized for a period of time. You need to find out why before you replace the actuactor again. I have seen those actuators melt down in a lump in 15-20 minutes time (depending on ambient temperature) if they are constantly energized. What is the link between the alarm and door locks? Is this an aftermarket alarm system? Professor www.telstar-electronics.com > Hi all, > [quoted text clipped - 6 lines] > > I drive a 1992 Maxima 3.0E (european model) >The power door lock actuator is nothing more than a solenoid. These >solenoid type actuators are only designed for intermittent duty. Sounds [quoted text clipped - 6 lines] >Professor >www.telstar-electronics.com I agree that he has them energized all the time. BUT 1: Nissan power locks have a motor in them (I suppose you could push the point and call it rotary solenoid). Even the £10 from Maplins and the things Ford fit for the power lock on the hatch of a '96 Escort Ghia have motors in them. 2: Nissan have a Posistor (thermal circuit breaker) in the circuit. when this gets hot the current is limited and the motor can't enough current to operate. Having had a look at the Nissan workshop manual and taken one apart there is a limit switch. So it either it's being driven the wrong way or has to much drag from the lock to operate. Try some WD40. OK I guess I revealed my age on that one... LOL Maybe I should say the last door lock actuator I worked on was a pure solenoid. Anyway... we are in agreement that both solenoids and motors that are stalled can be very high current drains... resulting in high heat dissipation. Thanks for bringing me up to date. Professor www.telstar-electronics.com |
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