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2003 Mazda 6 taillights

Tiny
ELCALIENTE
  • MEMBER
  • 2003 MAZDA 6
  • 2.3L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 122,000 MILES
- I have very little knowledge in automotive electrical systems ! Dash lights, tail lights parking lights are not working. Brake lights, reverse lights, signal lights, flashers are working. Checked all fuses for power with circuit tester and replaced bad with brand new ones of same amperage except # 31 ( tail lights) and # 32 instrument cluster, both fuses are new but there is no power from either of them, and yes I know this is the reason why my lights are not working but I cant figure the reason why there is no power from fuse? Any help you can give will be much appreciative this is a car I bought for my son he is in his last year of H.S and I would like it to be a memorable one. Thank You. Tony
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Sunday, September 13th, 2015 AT 9:36 AM

11 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check items in pic it may be the relay that is bad not sending power to tail light fuse and check ground in center of trunk. If these don't work then get it scanned for codes by a local pro as it may be the auto light module bad, not giving power to fuses.
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Sunday, September 13th, 2015 AT 11:31 AM
Tiny
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  • 7 POSTS
Checked and replaced all fuses that were bad there are two relays in the fuse box that are light blue in color I am wondering if they are the same amperage if so I will mark and switch them to see if that does the trick and check the ground in the trunk ( once I find it )
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Monday, September 14th, 2015 AT 6:49 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If the taillight fuse has power then the relay is good must have key on or headlight/parking light on though
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Monday, September 14th, 2015 AT 7:04 AM
Tiny
ELCALIENTE
  • MEMBER
  • 7 POSTS
Switched etc relay with with tns relay still no power to tail light fuse but engine idled fine, installed new rear brake, tailight bulbs sanded / cleaned ground in trunk ordered new tns (tail light relay) waiting for arrival will let you know soon as it is installed
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Monday, September 14th, 2015 AT 11:02 AM
Tiny
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  • 7 POSTS
OH ! By the way have my own scan tool and no codes, I always advise young men to marry a woman that will let you buy tools you say you need !
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Monday, September 14th, 2015 AT 11:05 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If your scanner is the type sold at auto parts stores it will read only engine/trans codes nothing else. You need apro model to read the rest of modules in your car. The brown/red wire engages the taillight relay. So it may be that that is bad. It will need to be programmed to your car which will require a pro to do that with his scanner.
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Monday, September 14th, 2015 AT 12:03 PM
Tiny
ELCALIENTE
  • MEMBER
  • 7 POSTS
Brand new tns relay did not do anything are all 2003 mazda 6 cars equipped with daytime running lamps? And how do I check to see?
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Monday, September 14th, 2015 AT 5:56 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Not sure on the daytime running lamps but until a pro scns this your lights probably wont' work I really thin the module isn't supplying power to the relay to supply to the fuse for lights.
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Tuesday, September 15th, 2015 AT 5:52 AM
Tiny
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  • 7 POSTS
I pulled the tns relay and checked for power with a probe and there is power from 2 of the receivers
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Tuesday, September 15th, 2015 AT 10:21 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Ok if power form two places it's either a bad relay which you tested already or something broken in fuse box not allowing powerto fuse. You can try bending prongs on relay a tad maybe to make better contact that may be the problem. Also use dielectric compound on prongs. Other than that I have no other suggestions for you
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Tuesday, September 15th, 2015 AT 12:19 PM
Tiny
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  • 7 POSTS
Ill try both and thank you for all your help God bless sir.
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Tuesday, September 15th, 2015 AT 6:50 PM

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