gcthree

The right hand mirror operates fine in all directions, but my left hand mirror does not move in the lateral direction. Up and down is fine. Any thoughts/suggestions on where the issue might lie.

I installed the GTS mirrors back in '96 when I first owned the car, so it's been a long time since I had them apart.

Might it be a wiring issue? The joystick must be fine as it directs the right hand mirror.

Thanks,
Bob

82Porsche928

This happened on mine. Pull switch and thoroughly clean all connections with wire bush. Do same with relay.

1982 Porsche 928 US Chiffon white 5 speed

gcthree

The left/right switch or the joystick?

Alan

There is no relay in any year, there is no solenoid in S4+ - '82 and '89 (esp with Aero mirrors) are very different animals.

Clearly the joystick switch is fine, the changeover switch connections or motor connections anywhere between - or that planes motor could have issues. Possible wiring break point is in the door @ the hinge/passthrough

Pull off the mirror glass (release locking ring first) and see if you can see any connection issues inside the mirror..

Next ID the motor connections and test - you should see a voltage when activated (reversed for direction change) on each motor pair - if you have that and good motor connections then you need a new motor. They are very reliable though - so its quite unlikely to be the motor

Alan

OTR18WHEELER

similar but different, may not apply to you but worth mentioning here,
my MY is an 85s, I replaced the pass side mirror motor from a later year S4 and found that I lost 4 way movement of the motor, but when I push the defroster button on the pod, the mirror motor will activate in one direction, and not stop untill I press the defroster button again. The pin plug is the same but a couple of the wires are different at the pins for the defrost. I know what my problem is, but have not fixed it yet. The S plug has a jumper loop? wire between terminals in the plug, but the s4 does not.
I had planned on taking pics to document this, but have not done it yet. No motor or switch problem, just a difference in model year wiring.

Jerry Feather

The mirror is driven by two racks and two pinions (sp?). I think you are going to find that one of the racks, the little plastic sticks with teeth on them, is broken. I also think that the motor assembly is the same in the GTS mirrors as in the flag mirrors, so if you still have the flag mirrors you probably still have the parts needed to fix this.

Alan

The GTS Aero mirrors motors are the same as the S4 flag mirrors BUT not earlier flag mirrors.

Alan

Alan

Pre S4 flag mirrors and S4 flag mirrors look the same - under the skin they are totally different and basically incompatible, the wiring is not close... Seems you don't really know what your problem is...

Early mirrors only have one motor with a plane selection solenoid, late mirrors have a more conventional motor per plane (dual motor) set-up. Best case - only one plane will work corrrectly without a relay conversion - wiring changes will never get you there... The defroster thing is something else again - shouldn't happen and should be fixable.

Alan

gcthree

All great guidance. Never thought of the adjustment as a rack and pinion...now, it all makes sense.

As always, thanks guys!

Alan

Jerry is certainly correct that the weak point in the movement is the plastic drive portions (the rack & pinion).

This is possibly easy to determine - if you can hear the mirror motors running for both planes but you only get movement in one plane then its NOT an electrical issue.

If you can't hear the motor running, can you hear it trying to move when you first engage the joystick? that also likely means the electricals are fine.

If you can't hear anything it could still be totally jammed and not electrical - but you can't be sure. Do the other tests as above to determine.

Alan

Jerry Feather

Here are a couple of pictures. One shows the Flag mirror with the broken rack and the second one shows that mirror motor alongside the mirror motor out of my GTS Aero Mirror Kit. The date on the mirror motor in the flag mirror shows 14/03/88. They look like the same motor to me, although the numbers on them are not the same.

Alan

They are basically the same motors - differences here are likely to be memory or no-memory; this was not exclusive to Aero mirrors - there were plenty of S4 flags with memory too, but most 928 Aeros have memory. Memory mirrors have extra wired connections (10 vs 6 for non-memory mirrors).

Aero mirrors work directly on any S4+ car with just wiring adaptations, quite a challenge to retrofit Aero's to earlier cars - you need a wire mapping & relay equipped harness.

Alan