1985 300z na 5 spd digital dash doesn't work

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greyhound2
Posts: 1
Joined: Sat Oct 23, 2021 2:34 pm
Car: 1991 Nissan 300ZX 2+2 NA 5spd, 1985 300z NA 5spd
Location: Colorado

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The digital dash on my 1985 300Z quit working with no warning. One day it worked fine and the next day it was dead. I checked the fuse for the rear wiper which also powers the dash and it is OK. I removed the power supply, re-soldered all the pins related to the wiring harness plugs and still nothing. Is the power supply shot, or is there something else I might try? Any help is appreciated. It's not good to drive with no speedo, tach, fuel, temp etc. info.


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Ozzie
Posts: 3927
Joined: Fri Oct 14, 2005 12:36 pm
Car: '90 300ZX twin turbo - 2 seater
'99 Legnum VR-4 Type-S twin turbo
'06 MK5 Golf tdi
Location: Australia

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I see you have resoldered the power supply, but it didn't fix the issue.
Did you check the capacitors?
They tend to go bad over time. Look for any that are bulging or leaking. Replace any that you find that have these issues.
Did you check the power supply with a multimeter, to make sure it's still functional?

BadQ45t
Posts: 3249
Joined: Fri Jul 26, 2002 7:54 am
Car: 21' Leaf SL Plus (wife's car)
05' X-Terra S 4x4
97' Q45t SOLD! Miss the old girl
84 300ZX (Original Owner)
2016 Mercedes Benz S550e V8 Power and 35 MPG
Location: Half Moon Bay, CA

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This is probably the digital dash controller since everything went out at once. I would try z31partsforyou.com to get a working version of the controller the guy that runs this site is a good dude, he's not cheap but his parts always work. I would say 99% chance this is the issue your running into.

BossCapBoost
Posts: 15
Joined: Thu Aug 20, 2020 2:36 pm
Car: ???

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Check with Xenon Z Car. I believe he repairs them.


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