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Old 8th April 2017, 15:06   #16
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Default Re: S-Cross DIY: TPMS & 12V socket installation

Hi Sudeep/DIY Bhpians,

Couple of queries from my side regarding fuse tap and TPMS; not sure if they've been covered. If so, kindly help me with the required info/posts.

I am planning to hardwire a dashcam and an extra charging socket in my Storme.

When looking into the fuse box to locate an empty slot, I observed that the empty slot had connectivity terminals only on one tooth (for the fuse) and other was empty. But the regular connected fuses all have both terminals into which the fuse plugs in. Adding a reference picture wherein the yellow box shows the empty slot and the red oval shows the empty tooth slot within that!?
The orange is showing the regular connected fuses. The question is, can I use this empty slot at all or do I have to piggyback on an existing fuse only?!
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Last edited by avinash_m : 8th April 2017 at 15:09. Reason: editing the pic for unwanted white space
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Old 11th April 2017, 22:18   #17
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Default Re: S-Cross DIY: TPMS & 12V socket installation

Quote:
Originally Posted by avinash_m View Post
When looking into the fuse box to locate an empty slot, I observed that the empty slot had connectivity terminals only on one tooth (for the fuse) and other was empty. But the regular connected fuses all have both terminals into which the fuse plugs in. Adding a reference picture wherein the yellow box shows the empty slot and the red oval shows the empty tooth slot within that!?
Wow, that is definitely a peculiar arrangement.

See, the 2 terminals you see in a fuse box represent two ends of a wire - one terminal goes to the battery (i.e. current input from battery to fuse), the other to the equipment being protected by the fuse (i.e. current output from fuse to equipment).

Now, my suspicion is that when there is a single terminal, there is only the wire running from the battery to the fuse terminal (because there will be a block of wires coming from the battery to the fuse box, there's no cost associated in wiring up all the fuses). On the other hand, the second terminal is missing because that specific equipment is not installed, so Tata Motors elected to skip installing a terminal and any wire/termination for that second terminal.

If my suspicion is correct, then you can safely use a fuse tap in that fuse, since all a fuse tap requires is 12V input. Just make sure the absence of a terminal doesn't mean the fuse tap is not loosely held.

How can you test whether the terminal that is present connects to the battery? You can use either an automotive tester (see step 3 in my thread), or if you have a multimeter, you can use the DC-V mode of the multimeter to see if the terminal present carries a 12V potential.

If the automotive tester lights up, or if the multimeter indicates 12V DC, then that terminal has a supply from the battery, and can be used to power a fuse tap. However, if this test is not successful, then you will definitely have to piggyback an existing fuse.

Although this requires a little more effort, I'd agree with your intention of checking these empty fuse sockets first (I prefer using a fuse tap in an unused socket rather than piggybacking an existing fuse).

Hope this helps, and keep us posted on what you find.
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Old 12th April 2017, 16:14   #18
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Default Re: S-Cross DIY: TPMS & 12V socket installation

Thanks a ton for the detailed and simple (to understand) explanation Sir; it really helps satiate the DIY 'kida' (bug) in absolute amateurs like me!

Quote:
On the other hand, the second terminal is missing because that specific equipment is not installed, so Tata Motors elected to skip installing a terminal and any wire/termination for that second terminal.
Per the Fuse box diagram, this terminal is meant for the 4X4 module; mine is a 4X2. In fact, there's another one such slot in the second row (from top). The only difference that I see between the two is the mentioned amp rating, one being at 10A and other at 15A.

Quote:
How can you test whether the terminal that is present connects to the battery? You can use either an automotive tester (see step 3 in my thread), or if you have a multimeter, you can use the DC-V mode of the multimeter to see if the terminal present carries a 12V potential.
Yes, will check and report back. I've already procured all the necessary tools, thanks to all the DIY threads on fuse tapping including yours. Just waiting on the camera to arrive from aliexpress.


On a slightly different note (from my first post), I'd meant to ask about the TPMS as well.

@sudeepg - can you please clarify if every tyre rotation would include rotating the sensors (respectively) too, for the TPMS to work?!
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Old 21st April 2017, 18:08   #19
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Default Re: S-Cross DIY: TPMS & 12V socket installation

Thanks Arun for your crisp and clear explanation. You are really good at explaining things, aren't you?

Quote:
Originally Posted by avinash_m View Post
@sudeepg - can you please clarify if every tyre rotation would include rotating the sensors (respectively) too, for the TPMS to work?!
If you rotate the tyres, you do not necessarily need to rotate the sensors. the U912 TPMS has a "learning" feature which allows you to go into a program mode and then specificy the new positions. It goes in like a clockwise order. I do not have the manual yet, but I will read through it and post back sections from it later.
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Old 21st April 2017, 20:31   #20
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Default Re: S-Cross DIY: TPMS & 12V socket installation

Good job there!

Just a few things regarding TPMS. I was using one since 2012. It was a Orange TPMS. The sensors fail due to battery life. The claimed 5 years of battery life is not always true. Two of my sensors failed after two years. Cost of 2 replacement sensor is equivalent to the cost of a new TPMS unit. So I bought a new one from Aliexpress. Working fine so far. This time I chose sensors with replaceable batteries. Also, check with the seller the cost of replacement sensor before ordering a unit. For some units the cost is too high or aren't readily available - skip those.

A TPMS is very essential thing for a car, specially who drive a lot or for someone like me who have shoulder problem and can't change a tyre without much effort :(.
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Old 25th June 2017, 01:09   #21
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Default Re: S-Cross DIY: TPMS & 12V socket installation

Quote:
Originally Posted by Sankar View Post
Get a visual confirmation to be sure. Remove the glovebox and put in fresh air mode and see the flap move. Keep wires clear of any moving parts so as to prevent chafing.

OT Just a tip: If wires need to be drawn through minor gaps provide an additional sleeve so as to prevent chafing due to vibrations/movement over the years.
Forgot to update this. You were spot on with your assessment! I fixed this soon after you posted your feedback.

There was a minor brushing of the sponges against the wires. I've re-routed the wires above and secured them with zip ties and confirmed with a visual inspection that there is no longer any interference with the air circulation control flap.

Thank you very much!
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