use 4 channel relay for window roll up?
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=138207
Printed Date: July 13, 2025 at 1:44 PM
Topic: use 4 channel relay for window roll up?
Posted By: sam369
Subject: use 4 channel relay for window roll up?
Date Posted: January 10, 2015 at 1:27 PM
After knowing the working mechanism of the window roll up modules, I wonder if it's doable by just using a five dollar 4 channel relay, like this one: https://www.amazon.com/SRD-12VDC-SL-C-Channel-Level-Power-Module/dp/B008MU0UXW/ref=cm_cd_ql_qh_dp_t
Just connect NO to +12v, NC to the end close to the switch, and the other pin to the end close to the motor. Just don't know if the relay accept ground signal input. Otherwise, a relay is needed to convert the signal to +12 input.
Replies:
Posted By: oldspark
Date Posted: January 11, 2015 at 2:53 AM
Why use that board? Why not just its or similar relays and then whatever switch/control polarity you want?
Posted By: howie ll
Date Posted: January 11, 2015 at 6:58 AM
Also, load detectors, on/off time, water ingress and mounting, by the time you're done, might as well have bought a closer, 529t, 530t, 535t etc.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: sam369
Date Posted: January 11, 2015 at 11:00 PM
howie ll wrote:
Also, load detectors, on/off time, water ingress and mounting, by the time you're done, might as well have bought a closer, 529t, 530t, 535t etc.
Just realized that those modules can usually tell if the windows are closed when wired to Ground When Armed wire, while a 4 channel relay cannot.
Posted By: howie ll
Date Posted: January 12, 2015 at 1:08 AM
Actually it's a load sensing thyristor or similar plus internal timer.
-------------
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: oldspark
Date Posted: January 12, 2015 at 2:12 AM
Yes - current sensing circuitry cuts the relays - both for safety or jams as well as the usual window at top or bottom. Some might use only timers, but IMO that is not the way to do it.
None afaik use limit switches.
Hence only the usual two SPDT relays are required per window motor assuming normal 2-wire reversible motors.
Relay "control" is by the circuitry controlling the relays. In my case that was simply via switches (centre-off SPDT) but I was intending to add smart circuitry. (Alas that that vehicle has since fled north...)
And thanks Howard for expanding my understated "... and then whatever switch/control polarity you want?". If smarts are required, it has nothing to do with the relays.
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