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S60 & V60 '11-'18 / XC60 '09-'17 General Forum for the P3-platform 60-series models |
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SMD Indicator BulbsViews : 423 Replies : 2Users Viewing This Thread : |
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May 9th, 2019, 11:25 | #1 |
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Last Online: Mar 9th, 2023 20:33
Join Date: Jun 2010
Location: East Kilbride
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SMD Indicator Bulbs
I was doing a late-night browse through the forum and came across a post from someone who had successfully fitted SMD/LED indicator bulbs. In the clear light of morning I cannot find the post! Anyone own up to it? :-)
I quite like the LED effect and would be interested in trying them. The only real problem is that I cannot fathom out how to access the rear bulbs! - secret-fixed plastic in front, body metal behind. How do you change the bulb? (Also, next problem is - are decoy resistors required, in which case, which wires do I bridge?)
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XC60 (2016) SE Lux Geartronic. Previously: S60, S40, V40. (plus an Audi TT Quattro Roadster for the weekend ) |
May 9th, 2019, 12:08 | #2 | |
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Last Online: Mar 20th, 2024 18:26
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Quote:
LEDs use less power than normal bulbs The car detects 2 x 21W and 1 x 5W indicator lamps as normal load. (2 x 21) + 5 = 47W Should a 21W bulb fail, then the load drops to 26W And then the indicators flash twice as fast to tell you a bulb is out. So you WILL need an effective resistor load of around 40-ish watts to fool the bulb failure detection. The remaining 7W will likely be the load of the LEDs. Using Ohms law: P = I x V and V = I x R A 40W load at 14V is P/V amps = 40/14 = 2.85A V = I x R 14V / 2.85A = 4.9 ohms So you will need to fit around a 5 ohm resistor that can dissipate at lease 40W of heat. Go for a 5 ohm 50W resistor This will come in a metal body and will need to be mounted to metalwork to act as a heat sink to dissipate the heat. Ensure there is no cloth or plastic in the area that could melt.
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May 9th, 2019, 16:33 | #3 | |
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Last Online: Mar 9th, 2023 20:33
Join Date: Jun 2010
Location: East Kilbride
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Quote:
All I want to know right now is how to get the b****y bulb out !!! (and by the way, I already have a stock of 5ohm50w resistors; I was just wondering if this car design still requires them)
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XC60 (2016) SE Lux Geartronic. Previously: S60, S40, V40. (plus an Audi TT Quattro Roadster for the weekend ) Last edited by bradams; May 9th, 2019 at 16:53. |
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