Thank you so much, you guys ROCK!!

There must be *somebody* out here who has seen how this resistor mounts? Anybody? Ferris? LOL

Hey all -- almost ready to start putting my interior back together and have a question.

There is supposed to be a "clip" of some kind holding the big yellow plastic airbag/SIR resistor onto the vehicle support frame -- mine is just laying in there behind the radio head unit flopping around loose.

Can anyone tell me if there is a "clip" of some kind holding the resistor and where it clips to (CCM frame, etc.)?

Pic attached, thanks!

Joe

1991 Automatic L98 Coupe

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Hi again all!

Next project; I am getting very low volume from both front speakers in my 1991 L98 Coupe, have tried 2 different head units, replaced the amps in (only) the front 2 speakers with supposedly good ones.

With volume all the way up on the radio or tape you can just barely hear the music from the front speakers, nothing from either of the rears.

What should I look for/try next? If the rear amps are bad would they impact the volume of the front speakers?

If the "real" receiver (the one under the passenger side of the dash) is bad, would that cause this behavior?

Thanks all!

Thanks to all I got both the CCM and DERM out, the DERM and air bag sensor appear to have suffered damage from some electrical fire or short in the car which has impacted a number of wires, so I've ordered a replacement DERM already.

Can anyone recommend where to get a replacement air bag impact sensor? Thanks again to all!

My bad -- it does appear to be the cruise control (small outer diameter) hose that is the bad one -- unfortunately as you noted it looks like it goes all the way into the firewall.

I may be able to just use some kind of joiner to splice in a good piece of hose under the hood? Thanks all...

I need to take out the derm and ccm because it looks to me like there might some some wiring damage or possibly damage from an old electrical fire in there and I want to check it all out.

on my 1991 L98 Auto Coupe, have the console, upper dash trim, and right and left lower trim and knee panels all off, but still can't see how to get these out.

It looks like (maybe?) the instrument panel bezel and cluster need to be removed? The center plastic "frame" over the metal CCM/DERM supports won't come out...

Thanks all!

Hi all - I have replaced most of the old dry cracked vacuum hoses under the hood of my 1991 L98 automatic coupe, but there is one line giving me trouble.

It's connected to (I think) the power brake vacuum booster, when I try to reach down to pull it off the one unseen end, instead of a solid resistance it feels like I am pulling on a "bellows" of some kind.

Is it safe to just pull until the line comes off (what I assume must be a fitting down there? can't see it...) or do I need to dismount the power brake vacuum booster from the firewall completely?

Thanks!!

This is probably one of the worst clean up jobs I have seen;

I have removed most of the tint but it came off in "layers" leaving behind what seems to be adhesive but is really a very thin layer of tint.

So far I have tried removing it with Goo Gone, oven cleaner, de-icer (all from Internet research) with 0000 steel wool, but nothing is really working. Except for painstaking and dangerous (to the defroster wires) scraping with a sharp razor blade.

Isn't there an easier way? I even tried respraying the tint-off solution I bought online as well as one I found in Wal-Mart, but it just softens up the old tint not really making it any easier to remove.

I have not yet tried ammonia or alcohol, or using a rag -- anybody have any suggestions that aren't so much work?

Thanks all!

That would be great if I can "rebuild" the existing one, I understand they are pretty expensive. Are they easy to remove?

I've swapped out the relay with a known good one, still same problem, also there is 12+ volts at the orange/black plugs at each speaker. I would think this would indicate the relay is sending voltage to the amps at the speaker units, but the amps are not sending anything to the speakers...?

Has noone here ever had this problem? I see posts and tech FAQs about the fuel guage always reading full, but not empty...anyone? Thanks!

Yep, antenna is plugged in (although it only goes up partway, I have another post about that problem!), and all fuses are OK, the tape doesn't work either, I get nothing from any of the speakers, but a strange "hissing" sound from the control head unit (not receiver)...I'm thinking that could be bad too?

That's what I was thinking, though it now pretty much confirms my theory that I have all the wiring back together, but with no sound I probably have all 4 amps blown in the speakers :-(

Thanks

I've got the film pretty much off the back window, but don't want to use a razor and mess up the defroster wires...

What have you used to most easily and quickly remove the adhesive left behind after removing old tint film?

Thanks all!

On my 1991 C4 auto coupe, on the right (passenger) side of the "real" radio receiver (original equipment Bose Gold) there are 4 opening for pre-configured wiring plugs; however, I can only locate/identify 3 (the 2 on the left and the one on the lower right, looking at it from the right hand side mounted).

It seems there should be something that goes in to the "upper right" corner female plug on the receiver -- can anyone help?

Appreciate all the help from you experts out there, thanks!!!

On my 1991 C4 auto L98 coupe -- can I get away with just a mast replacement, is it a pain as much as I have read, or do I need/is it easier to replace the whole antenna?

Thanks all!

On my 1991 L98 auto coupe -- any suggestions, hints, etc?

Thanks all!

OK -- getting there -- I spent yesterday rewiring all the original Bose equipment (I really want to keep it if works and until I rewired it who knows).

Now I get power but no sound from any of the speakers, do get a weird hissing type noise that seems to be coming from the head unit (in the dash in front of the shifter not the "real" receiver under the glovebox.

I checked voltage at each speaker orange wire getting 12+ volts so (according to the FSM) the CDR ("real" receiver) is supplying voltage to all speakers.

Would a bad head ("control") unit possibly be the cause of this? Thanks all!

Going strictly from memory, sounds like it could be the switch, check the turn signal stalk to make sure it's all the way into the steering column, also right behind it (to the front of the vehicle) possibly under a small plastic cap is an electrical connector which I think is for either the wipers and/or cruise control...

The bundle of radio wires in the picture were run from an aftermarket adapter over by the "real" receiver under the passenger side of the dash...when I traced everything back, I was able to reconnect all the original plugs to the original Bose radio receiver, head unit etc.

Now, the unit powers on, the antenna goes up (well halfway anyway!), the radio seeks and scans, but no sound from any of the original 4 Bose speakers, from either the radio or a tape.

I have checked all the wiring and it looks OK, all the fuses look OK, and the relay for the amplifiers (under the driver's side of the dash) all look OK -- could all 4 speakers be bad?

As for the SIR part, I am almost certain is the "resistor" referred to in the FSM...but it would be nice to know for sure...

Thanks again to all...

Joe

I studied the FSM and it looks like the large yellow "plug" could actually be SIR "resistor" which clips onto a dash panel, even though it looks it is supposed to connect to something, I don't think it does, can anyone verify that?

I figured out the radio wiring, except now I have power to the radio but no sound from any of the speakers :-( any thoughts?

Thanks!

Thanks all of you guys are great, I have an FSM but have difficulty figuring out the wiring -- one more question, what exactly does the big yellow connector connect to? The DERM, what? Thanks again!

Joe

I need help fixing a butchered wiring harness on the 1991 C4 auto coupe I just bought.

1. Can someone identify the large yellow plug in this picture and tell what it is for (SIR?) and what it is supposed to connect to?

2. There are a bunch of cut wires on the picture as well, that I am sure go to the radio, can someone tell me where they are supposed to terminate and maybe how many and what type of connectors are supposed to be there? They don't go to the head unit, those 2 connector plugs are visible in the background.