So I picked up a s5 last week and I haven't been able to figure out why my turn signal isn't working.

My left signal is not getting any power when we checked both front and rear sockets. Also, fuse looks to be ok.

The weird thing is that when I try to use the left signal it sounds like its working, but there is no light on the cluster or obviously the front/rear that blinks.

Has anyone else had this problem before?

Another issue I've been having is the fuel gauge seems to only work for 50 miles. When I got the car it was full. I drove around 50 miles and it basically was siting under empty. I thought well maybe it was empty. I went to the gas station and "filled up" the 4 gallons it let me ahha. So I thought maybe it was just by accident the gauge did that. So I drove and it was back up at full. Then about 50 miles of driving later it started dropping and soon it was sitting under empty again.

Any advice? I was thinking there was a sensor that isn't good but have no idea.


Thanks for any help in advance.

Nick

 

At the CPU there is a 7 wire plug with a Green/Black wire. This wire should have voltage w/key to on and the turn indicator lever set to left turn. If the right hand blinker works then the fuse must be good.

And your fuel level sender located in the gas tank likely needs replacing.

 

Thanks...I figured there was something with the fuel sender ish.

What do you suggest I do with the signal then? Follow the wire?

I'll most likely be stripping the carpet and rest of the interior this week to thoroughly clean the car out so I could probably trace it then.

Thanks again!

Nick

 

Just check the wire as suggested. Needs no removing of anything. If the wire doesn't have voltage as specified then you would need to check another wire in the same plug under the same conditions and that wire would be the Green/Red wire. If the G/R wire checks out okay but the G/B wire doesn't then the issue is either the Flasher unit or a poor soldering connection on the flasher circuit board. And does the blinker light in question work w/the hazards on?

 

No it has the same problem with the flashers on. It's as if the left side is dead.

 

May have another problem.

My oil pressure gauge is always topping out even when I shut the car off.

Suggestions?

 

The wire connected to the oil pressure sender is grounded by accident or the condenser for it (looks like a small computer chip) has fallen off the wire connected to it and the wire itself was grounded which is incorrect. Either will damage the gauge if this situation occurs too long.

 

Alright thanks for the info. When I get a chance to look at it I'll see if I find anything worth mentioning and keep u updated

 

I found one possible short

Also, can you use the s4 idiot cluster to replace the s5? I tried but my parking brake didn't show up on the s4 one.

 

The plug pictured was it connected to the headlight switch?

 

if I recall correctly, yes it was...It was a white and green wire

 

Most definitely

 

That would prevent the dash lights and the tail lights from working. It has no bearing on your fuel gauge or oil pressure gauge woes.

 

The gas gauge problem is from the sensor I found out and will buy a new one tomorrow. Not entirely sure why the signal on the driver side does not work yet, but I haven't checked the wire by the ecu yet.

Also, the other pressure problem I haven't looked at yet. Only had time to work on one thing tonight.

 

It's the CPU and not ECU.

 

Question. Had a problem with headlight switch (87 RX 7) . Replaced harness (fried) and replaced switch with a good switch then put a relay in as instructed by iceman's post. Tested all before put back together and everything works fine (even the turning signals)EXCEPT a few days later now the turning signals, dimmer and passing switch does not seem to be getting any power and won't work. I checked all fuses and all are good. Any Ideas..at first I thought maybe I did not plug in that harness all the way but that was not the case.

 

W/the headlights on go to the Dimmer Relay located in front and to the side of the radiator. Relay has 5 wires. Two are Red/Green, one is Red/Black, one is Red/White and the other wire is White. Ground a wire to the White wire and see if the brights turn on or not. You can also try supplying the Red/White wire w/voltage from either of the Red/Green wires and the brights should turn on. If they don't then the high beam filaments are probably blown.

For the turn signals to work both the Hazard fuse and Turn fuse need to be good. Are they?

 

Thaks for your quick reply. Found dimmer relay and I did ground the white wire and I do have brights. Check both fuses (in fact changed with new ones) and both fuses are fine. Flashers work fine both front and back but still no turning or passing

 

When you pull on the signal lever to turn on the high beams or signal the flash to pass lights you are grounding the White wire at the Dimmer Relay. This means either the Dimmer Switch is faulty or the connection between the switch and relay is bad but since your turn signals also don't work then it appears the switch is the cause for both problems. At the CPU there is a seven wire plug that has a Green/Red wire and a Green/Yellow wire. W/the turn signals set to left turn position the G/R wire should have voltage w/key to on and the G/Y wire has voltage w/the signal set to right hand turn. Again, the connection to the switch or at the intermediate connector, FC-02, could be an unsolid one.

 

Is it possible I screwed up that relay I added to the headlight harness...but I triple checked and everything seemed ok right after. I noticed this problem after I took out the donut tire to change a flat..crazy. thought maybe I screwed up a wire in the rear turn light wire???

 

The relay you installed should not have an affect on whether the high beams work or not. If your low beams work then the relay you installed must be wired properly enough. If you check the two wires at the CPU as suggested that will tell you more as to where and what is causing your problem.

 

Will have to check out the CPU as suggested. Just picked up a switch off ebay for about 40.00 to see if that is the problem (they warranty for 30 days). If not a switch then do you think it is a bad CPU?

 

Or a loose plug. And the CPU board for the hazards is the same board that the turn signals use so if the hazards work then it should work for the turn signals as well. The only apparent problem at the CPU would be a possible connection/pin related problem but checking the two wires as advised would tell you if that were the case or not.

 

I will have to check the CPU another day and will let you know what I find out. All these problems and my rx7 only has 70,000 miles on it...and looking at parts on ebay with over 200,000 miles on it....Thanks for all your help...Will get back when I test the CPU.

 

I think my problem is that I am using a 1990 light harness in my 87...was told by the buyer it would work but some posts suggest otherwise. And I just checked both plugs. The original (87) plug has 9 wires and the one I bought (90) has 8 wires. I have already put in the relay so I can't return it. Any Suggestions..