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Mazda tns relay drains battery - 1991 Mazda RX-7

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Mazda b2500 flat battery after parking

Battery drains can be hard to find, but start by having alternator tested for bad diodes. Next, disconnect battery ground from fully charged battery and hook up amp gauge with everything turned off. There should be a slight reading as several systems do draw a tiny bit even when off. If you have a reading of more than 1 amp, disconnect fuses one at a time to see if you find one that cures the high draw. Then test that circuit for a fault. NOTE: many times newer cars can have a relay sticking on, that you can find by feeling the tops of the relays. If one is warm or hot with everything off, it is likely your problem. Good luck!

Jun 23, 2016 | Mazda Cars & Trucks

2 Answers

A TNS fuse is clicking when the ignition switch is off but when i go to ACC the clicking stops. What does this fuse do and what does it stand for and 3 what can I do to get this fixed

It is not a fuse, it is a relay.
  • TNS controls parking lights, tail lights and running lights.
  • Not sure what TNS stands for but my guess would be "Taillight, Night Running lights and Stop light"
  • Normally the TNS relay is powered by the taillight fuse and is energized when the headlight switch is turned on
Having said that I'm not sure why it would be cycling when the ignition switch is off. Could be a short to ground somewhere in the system. If you have had any work done I would have it rechecked, especially if you swapped out radios or added extra lighting somewhere.

Other things you can try:
  • Pull the taillight fuse. The TNS should not have power and the lights will not work.
  • If the TNS is a removable type of relay pull it out and see if you still hear something clicking
  • With the relay pulled check the base. The coil side should have 12vdc to ground on one side. the other side should not have continuity to ground with the headlight switch off.
  • If there are other relays in the box of the same type, try swapping them out and see fir the problem follows the relay.
While these things will not fix the problem it may help diagnose the underlying problem.

Oct 28, 2015 | 2001 Mazda MPV

1 Answer

How to cure a ticking relay in tns slot on kia rio.

If its a sealed relay, tap on it, or you may need to unplug and replace it.

Oct 19, 2015 | 2003 Kia Rio

1 Answer

Tns relay is making nosie on my 98 kia sephia

Check and replace if it is not working properly all mechanical relays will make noise when they click once to engage current to the load side of the circuit.

Oct 19, 2014 | 1998 Kia Sephia

1 Answer

I have a 02 kia sedon,what would stop the tramission from moving. I change the fluid,which it was black.It will not move now.Also the TNS relay was getting hot.I switch it with another one and the van move...

Whenever the transmission fluid is black it means the transmission is shot. when you see black fluid NEVER flush it because all the friction plates are gone and by flushing it your draining any friction material that may still be in the trans. Im sorry to say you need a trans overhaul :(

Sep 15, 2011 | Kia Sedona Cars & Trucks

1 Answer

Hello, I have a 2002 Kia Rio 4 dr. When you turn on the light switch for the lights to come on..the switch is supposed to turn on the headlights, taillights and light on the dashboard. Now the swtich...

Check for power at the left and right tail lamp fuses in the fueblock. If there is no power check the TNS fuse. If there is power there than you can try swapping the TNS relay with another relay in the fuseblock that is the same. If there is still no power after swapping the TNS relay you need to check the light switch.

You need to check the green wire on pin two on the back of the light switch to see if there is power there. If there is power than the light switch is probably bad.

You could also check the light switch operation with the TNS relay removed. Two of the pins in the fuse block should have power to them. One should be grounded all the time (the one that feeds power to the fuses) and one should be grounded only when the light switch is on.

Since the instrument cluster illumination gets its power from the right taillight fuse it has to be one of the above.

Apr 20, 2011 | Kia Rio Cars & Trucks

1 Answer

The rear driving lights do not turn on. bulbs are good. can't find a blown fuse or any even figure out which fuse these lights are on

check the 10 amp fuse labeled "EXT". also try swapping the "TNS" relay with the horn relay. These are probably in the engine compartment relay box. Let me know if you have questions.


Nov 06, 2010 | 2002 Kia Sedona

2 Answers

My miata battery drains all th time

try this can also use a test light instead of an ammeter to see which circuit is draining the battery:

Jun 16, 2009 | 2003 Mazda MX-5 Miata

1 Answer

Cannot remove key from ignition unless battery disconnected

this is a common problem, but 99% of the time it's easier to fix than you think. Most common problem is that there is a release mechanism on the collumn somewhere. Look carefully, usually underneath. Push it and while holding turn key to off position. Sometimes you have to push the key in while turning. Please post your results.

Feb 07, 2009 | 2000 Mazda MPV

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