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Discussion Starter #1
Hi all,

I'm new to this forum. I recently bought an used Honda 2007 Civic 1.8S. The speedometer backlight goes off while I'm driving and occasionally come up on its own. Not sure what is causing this issue. If I shine a light on the lcd, I can see the speed, fuel level and temp displayed on the lcd. It's just the backlight that is not working. Can someone please guide me as to what I need to do, to fix this issue?
 

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Welcome to the Forum.

If the backlight is not working, then you might be able to open it up and figure out what LED is bad or if there is a bad connection on the board or something. Some of the gauge clusters can be taken apart easily, and others are glued together for the most part. What I don't know is if the backlight is a separate piece like it is on an LCD TV.

In the end, you might be better off getting one at a salvage yard and swapping it out. The Pick-A-Part places will usually let you exchange parts if they end up not working.

Good Luck.
 

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Re-read your note....since it comes and goes, I wonder if it could just be a loose connection. That would be a lot easier to fix (but might be harder to diagnose). If the main connector is not the culprit, I would probably open it up and carefully re-flow the solder on the connections. Sometimes a solder joint will crack and cause intermittent connection.

Good luck.
 

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Re-read your note....since it comes and goes, I wonder if it could just be a loose connection. That would be a lot easier to fix (but might be harder to diagnose). If the main connector is not the culprit, I would probably open it up and carefully re-flow the solder on the connections. Sometimes a solder joint will crack and cause intermittent connection.

Good luck.
Hi Glen,

Today I took it to a meter workshop(they are specialists in fixing speedometers) in my area. The guy removed and checked the speedometer console and said the SMD LEDs had to be replaced on the console board and I agreed to it. Took about 1.5 hours for the whole process.

Once he hooked up all the connections the backlight was working and everything was crystal clear. I was very happy to see the console working. After that, I rode for about 5 kms and boom, the backlight stopped working again. Checked the LCD, it is working. It's the LEDs again.

I took it back to the meter workshop again and explained the issue. The guy re-checked the console on his custom local setup and hooked up the connection to the LEDs. This time I saw it for myself, the LEDs were working(I was wondering at this point if he even replaced the LEDs the first time wehen he worked on the console). But once he fitted the console back on the car and turned on the ignition, backlight did not come back up.

He did a couple of diagnostics by checking the fuses, wiring and then concluded by saying that the wiring is not proper and that I need to take it to an electrician for futher diagnosis.

I will take it to an electrician to check the wiring. But I'm worried if there was some kind of wiring issue, the LEDs supposedly replaced by the guy from the meter workshop may have blown again.

How easy is it to blow SMD LEDs on these types of consoles and what can cause it?
 

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Well, I'm an ME, not an electrical engineer but I thought that it takes quite a lot to damage the LEDs. I'd bet that vibration would be the reason vs. voltage. You'd have to apply too much voltage to damage them, and you've only got 12V to work with.

I attached some pics of the wiring diagram for the speedometer cluster. Sounds like the brown wire should have 12V when the switch is in on or start. If it doesn't voltage, then that is your problem - need to chase that wire down. If it does have 12V, maybe wiggle it and make sure it is constant, and then I'd say that maybe there is a solder joint in the gauge cluster that is losing contact when it warms up perhaps.

Or was any other custom work done on the car? Sometimes when they install aftermarket equipment, they might have to disconnect/re-connect some of the wiring around the fuse box and that might not have been re-installed all the way in.

Hope this helps....these sort of things can be aggravating! How much did they charge to replace the LEDs? (if you don't mind me asking).
 

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