Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




32 posts

Geek


# 256042 11-Sep-2019 20:58
Send private message quote this post

I’m trying to connect an accessory to my Hazard Light switch that I want to turn on at the same time as the Hazard Lights.

 

The Hazard Light has switch connection has 4 leads two that appear to be ground another one that is +12V when the headlights are on to illuminate the switch and another (pink) that is +12V when the Hazard switch is off. This lead drops to 0V on pushing the switch.

 

I was thinking of using a NC Relay and running it from this pink lead as well as ground to energise the relay, the only problem is energising it in this manner switches the Hazard lights on as the coil in the relay is making a circuit the same as if the Hazard switch is pushed.

 

 

 

 Are there any clever ideas to get around this, adding diodes or similar?

 

Hope I’ve explained it well enough


Filter this topic showing only the reply marked as answer Create new topic
3334 posts

Uber Geek

Trusted

  # 2315260 11-Sep-2019 21:10
Send private message quote this post

Your relay needs one side of the coil connected to a battery feed with the other side of the coil via a diode (to stop the current back feeding) to the pink wire. If you've describe it properly that should work.

 

 





Sony Xperia X running Sailfish OS. https://sailfishos.org The true independent open source mobile OS 
Samsung Galaxy Tab S3
Nokia N1
Dell Inspiron 14z i5


631 posts

Ultimate Geek


  # 2315261 11-Sep-2019 21:12
One person supports this post
Send private message quote this post

I assume this is a late model car as it sounds like the switch earths an input to a ECU/BCM, rather than the older system that connects directly to the flasher unit and lights.

 

What make and model?

 

You could possibly cut the pink wire near the switch and connect the cathodes of a couple of 1N4007 diodes to the switch side. The anode of one diode goes to the pink wire that was cut. The anode of the other diode goes to the relay coil. The other side of the relay coil would go to a battery positive supply. The diodes would prevent the relay from feeding back into the ECU/BCM.

 

 


 
 
 
 




32 posts

Geek


  # 2315264 11-Sep-2019 21:19
Send private message quote this post

Correct, It's a 2005 Nissan Van.

 

Yes I do believe it has a BCM module, it seems to be the only thing that makes sense that a 0V turns on the Hazards.


11 posts

Geek


  # 2315265 11-Sep-2019 21:20
Send private message quote this post

Have you considered the effect on battery life as the relay would be energised the vast majority of the time?




32 posts

Geek


  # 2315277 11-Sep-2019 22:08
Send private message quote this post

MuzaNZ:

Have you considered the effect on battery life as the relay would be energised the vast majority of the time?



Not really although wouldn't think the coil would use much power?

Wdat about if I did it as k1w1k1d suggested, the battery positive could he run off an switched accessory feed so the coil wouldn't be energised when the vehicle hle was off.

631 posts

Ultimate Geek


  # 2315355 12-Sep-2019 07:28
Send private message quote this post

Relay won't be on until the hazard switch is turned on, so no current flow through coil.




32 posts

Geek


  # 2316582 12-Sep-2019 16:32
Send private message quote this post

k1w1k1d:

 

Relay won't be on until the hazard switch is turned on, so no current flow through coil.

 

 

 

 

Thanks @k1w1k1d It worked perfectly what you suggested

 

Thanks to everyone else too :)


 
 
 
 


631 posts

Ultimate Geek


  # 2316672 12-Sep-2019 17:38
Send private message quote this post

Glad I was able to help.

 

 


Filter this topic showing only the reply marked as answer Create new topic



Twitter and LinkedIn »



Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Samsung Galaxy Fold now available in New Zealand
Posted 6-Dec-2019 00:01


NZ company oDocs awarded US$ 100,000 Dubai World Expo grant
Posted 5-Dec-2019 16:00


New Zealand Rugby Selects AWS-Powered Analytics for Deeper Game Insights
Posted 5-Dec-2019 11:33


IMAGR and Farro bring checkout-less supermarket shopping to New Zealand
Posted 5-Dec-2019 09:07


Wellington Airport becomes first 5G connected airport in the country
Posted 3-Dec-2019 08:42


MetService secures Al Jazeera as a new weather client
Posted 28-Nov-2019 09:40


NZ a top 10 connected nation with stage one of ultra-fast broadband roll-out completed
Posted 24-Nov-2019 14:15


Microsoft Translator understands te reo Māori
Posted 22-Nov-2019 08:46


Chorus to launch Hyperfibre service
Posted 18-Nov-2019 15:00


Microsoft launches first Experience Center worldwide for Asia Pacific in Singapore
Posted 13-Nov-2019 13:08


Disney+ comes to LG Smart TVs
Posted 13-Nov-2019 12:55


Spark launches new wireless broadband "Unplan Metro"
Posted 11-Nov-2019 08:19


Malwarebytes overhauls flagship product with new UI, faster engine and lighter footprint
Posted 6-Nov-2019 11:48


CarbonClick launches into Digital Marketplaces
Posted 6-Nov-2019 11:42


Kordia offers Microsoft Azure Peering Service
Posted 6-Nov-2019 11:41



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.


Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.