Landseer

You should be able to read all feeds from the headlight switch at the Central Electric unit.

Same with all 4 feeds to the headlights themselves (post fuses).

Do you have the wiring diagrams for the 82?

For the headlight feeds
M1 (at CE panel) = 56a Left Side, Wht/blk (@ headlight bucket), Fuse 24
M2 = 56a Right Side, Wht, Fuse 25
M3 = 56b Left Side, Yel/blk, Fuse 26
M4 = 56b Right Side, Yel, Fuse27

For the motor feeds (which sound like they are working fine)
N8 brown/red = 30b at motor = 30bm at relay
N7 white/black = 56 at motor = 56 at relay
N6 green/yellow = 86 at motor = 86m at relay
N5 red/black = 30 at motor = 30m at relay

For the dimmer switch
B1 at CE panel = 56a at dimmer switch
A1 = 30

For the light switch itself
A2 = 30
B6 = 30b
B7 = 58
B5 = 56
B3 = 58L
B4 = 58R

You really need the CD's that Alan references. Be real careful with these circuits.

Have you checked the headlight bulbs themselves? Do you have power at M1,2,3 or 4 (they feed the high and low beams, r & l sides) and fuses (noted above)?

Alan

Yes but I think the root of his question is - what should all these be doing under different conditions... its actually quite complicated - even to explain when you know...

My approach was to break the systems into major parts and create simpler circuit diagrams for each feature individually:

- The light switch modes
- The pod raising & lowering mechanisms
- The headlight switching mechanisms (incl Hi/Lo)

It still requires some comprehension of the systems from these but its much less confusing (especially when described).

I understand the schematics quite well but it took a while to comprehend how all the HL circuits worked - the schematics are very confusingly drawn (as are many - HVAC comes to mind). Even with this - the headlight relay (3 versions) are not described functionally and operation needs to be deduced based on understanding of the intent...

The debug can be impossibly complicated til you "get" this ...


Alan

Madmarek

I have a set of manuals on CD but am not sure if they are the same you are referring to.
It came with the car. Looks like a ton of books that were converted to PDF.
Many of the wiring diagrams are not readable.
Do these CD's have an explanation of the relays?
Do you guys have a link to these CD's? I will buy them if they are in fact better and/or different that what I already have.

Madmarek

A few days ago when I started all this I did jump across some of the relay contacts and the headlights did come on so bulbs good. I guess I need a better understanding of the headlight relay and how the whole X terminal and the logic works.

Alan

Yes though the originals are letter size printed manuals - a 9 volume set for the later carsSome of these were not very good in the hard copies either - but the scans are often worse. They are actually available in apprx 5' x 3' roll printed versions - easy on the eye but a pain to use otherwise. I have such a set for my '94 - they are very rare though!
No there are no descriptions of any - though many are just standard SPST/SPDT Bosch types if you have a multi CD set they are probably Jim's - if you have a DVD it may be a poorer copy/scans... otherwise PM Jim Morehouse on rennlist.

To your other post - yes figuring out how it all works is useful - for most people it never happens - there is just so much... Most folks focus on just fixing what is broken - that usually keeps them busy...

Alan

Madmarek

Thanks, I think I will print out a set at work and blow them up a little on the plotter so I can actually trace things out.

Madmarek

I did a little more poking around. Where does the 86M get fed from?
to me from the drawings it comes from the headlight motor but its not labeled the same.

I pulled the headlight switch and all the contacts rang out properly according to my schematics.

The X bus is on with the key on.
Jumping 30 to 56a,56b light up the lights.

With the ignition on, pods up, switch in 2 what should I be reading on the following:
bm30, b30, x, 56

These feed some sort of logic circuit.

StratfordShark

Could there be a problem with the rotating switch in headlight motor which powers lights on when they are up?

Madmarek

I guess that what I am asking. Where does the 86m ciruit come from?
Its not labeled 86m at the headlight motor but the schematics lead me there.

Landseer

It is a terminal on the relay.

Madmarek

Ok so if the ignition is on, the pods up, light switch in 2 should the 86m be +12v with the relay removed?
If so where does it come from in the circuit. Does it come from the pod motor indicating proper position or does it come from another switch etc.

Ron V

I had a simular problem a couple of years ago. I don't remember all of the symptoms, but it turned out to be the ignition switch. Good Luck!

Madmarek

Ok this afternoon I wrapped a tiny wire around the 86m post and fed it 12+ and my pods went down.
Not what I was expecting.

I don't want to just start throwing parts at it but I might have to. Starting with the Combo relay and then the light switch.(easiest to do first).

Landseer

So, it sounds like at least one of the relays within the headlight relay is either not energizing or not making contact once it does energize.

Some folks have taken the cover off the relay and cleaned the contacts.

I chose to purchase a new relay. This one costs about $110, so it is costly, but with it comes peace of mind.

Madmarek

I think tonight I will study the schematics a little more and do a few what if scenarios on paper to see if i can duplicate what I saw with the applied voltage to 86m.

Also I might look at the schematics for other years and maybe the drawings will be clearer.