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R34 Electrical Issue's

crissy

By crissy,
in General Maintenance

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crissy Explorer

crissy

Posted
Posted

Hello, I have a 1998 R34 coupe and im having some weird problems.

The other week i got in to drive it and when i unlocked it problems started,

1. The tacho and speedo dont work,
2. The bell chime for door didnt chime,
3. The interior light stays on,
4. The passenger door wont lock with the button on the remote or drivers side panel.

It still starts and drives fine,
I disconnected the battery and reset the ECU which worked, but then it happened again and again now that trick only works sometimes.

Any ideas? Cheers

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Deza3000 Proficient

Deza3000

Posted
Posted

I reckon you should get it checked by an automotive electrician. Sounds like brittle cables between the battery and the accessories. Could also be a shorted PCB. I had a similar problem with my r34 in regards to the power windows, ended up being brittle wiring on the drivers side, causing the passenger side window to wind down but not up. Yours is a bit more complicated, i dont think its something that will just go away.

sleptema Proficient

sleptema

Posted
Posted

Hello, I have a 1998 R34 coupe and im having some weird problems.

The other week i got in to drive it and when i unlocked it problems started,

1. The tacho and speedo dont work,

2. The bell chime for door didnt chime,

3. The interior light stays on,

4. The passenger door wont lock with the button on the remote or drivers side panel.

It still starts and drives fine,

I disconnected the battery and reset the ECU which worked, but then it happened again and again now that trick only works sometimes.

Any ideas? Cheers

Tacho + speedo: Take out the dash, check for lose plugs.

Interior light and bell chime for door could be linked (as i'm guessing with the switch on "DOOR" it stays on?, but "OFF" it turns off?) Guessing it is the switch inside the door playing up. Where that little rubber piece is.

Passenger door: Does it lock when you flick the door lock internally, like the actual switch? Does it unlock with the controls on the passenger door?

Deza3000 Proficient

Deza3000

Posted
Posted

Tacho + speedo: Take out the dash, check for lose plugs.

Interior light and bell chime for door could be linked (as i'm guessing with the switch on "DOOR" it stays on?, but "OFF" it turns off?) Guessing it is the switch inside the door playing up. Where that little rubber piece is.

Passenger door: Does it lock when you flick the door lock internally, like the actual switch? Does it unlock with the controls on the passenger door?

I was under the impression that its all just one big problem?

#@crissy

Did these arise all at the same time? Or did the car just start having more and more problems? If its the second question then id go with what sleptema suggested.

sleptema Proficient

sleptema

Posted
Posted

I was under the impression that its all just one big problem?

#@crissy

Did these arise all at the same time? Or did the car just start having more and more problems? If its the second question then id go with what sleptema suggested.

I don't think they can be related, or he would be having issues with the entire car, not just those 3-4 things. I believe the tacho and speedo gain their signals from the Engine computer, where the door lock and chime is body control computer. Tacho gets its feed from the CAS, which can in no way be related to the door locks. And if it was the ECU, I doubt the car would be running smoothly. I don't want to jump to ecu replacement when it is most likely small shit,

sleptema Proficient

sleptema

Posted
Posted (edited)

The ecu gets the speed signal from the speedo.

The tacho gets its signal from the ecu.

Weird hey.

And the ECU gets is signal from the CAS. The speedo gets its signal from the WSS yes, the ECU doesn't read the speedo, the gauge is an output from other sensors.

Sensor (input) -> ECU (processer) -> Actuator (output - in this case, gauge)

I'm saying the tacho and speedo are more than likely related, but the tacho/speedo combo isn't related to the door locks as they are on completely different circuits.

Edited by sleptema
533 RYC Proficient

533 RYC

Posted
Posted

And the ECU gets is signal from the CAS. The speedo gets its signal from the WSS yes, the ECU doesn't read the speedo, the gauge is an output from other sensors.

Sensor (input) -> ECU (processer) -> Actuator (output - in this case, gauge)

I'm saying the tacho and speedo are more than likely related, but the tacho/speedo combo isn't related to the door locks as they are on completely different circuits.

Yes, the ECU gets it signal from the CAS, the ECU drives the Tacho.

The speedo gets it's signal from the gearbox output shaft, the same place as the ECU.

The wheel speed sensors are traced back to the ABS/Attessa ECU. The only time the ENGINE ECU references WSS is during traction loss (traction control for rear wheel drive only).

  • 2 months later...
Phyco Apprentice

Phyco

Posted
Posted (edited)

Hey, Just wondering if you got anywhere with resolving this crissy? They are all connected in some way, as I have exactly the same issue. I have narrowed it down to the either the ODO/Speedo/Tacho cluster or one of the cables running into it, as generally by giving it a bit of hard tap or removing and reconnecting one of the cables from behind the cluster the issue goes away (until next time). It's funny when starting the car as you don't get the reverse beep or have the doors lock, and then all of a sudden everything happens at once, like a delayed reaction.

Edited by Phyco
Phyco Apprentice

Phyco

Posted
Posted

Narrowed mine down to a contact issue on the TK20 Brown Connector (fuel gauge side) at the back of the cluster, as it has inputs/outputs for all the affected items (Door Locks, Reverse Chime, Speedo, Tacho, Engine Temp etc) just in case that is of any help to anyone else in future!

  • 7 years later...

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