TRW Keyless Entry module

[White93z34]

Basically the 2 big ICs are the biggest areas of concern.

For me over the long run reflowing the joints is a temporary fix, I've had more success in adding some good solder. Recently I've purchased a proper desoldering tool and I'll just clean out the solder and start over with fresh

[GnatGoSplat]

I originally did the 2 ICs, but then had to do it again not too long after (can't remember if months or years).  So I ended up just reflowing every single joint and that kept it working well over a decade.  I added flux to every joint and added a little new solder, but I didn't remove any old solder.  If you plan to desolder first, then I'd recommend finding vintage 60/40 solder (with lead).  If all you can get is RoHS solder, then it'd be a good idea to keep the old solder as it still has lead.  Leadless RoHS solder are famous for solder joints going bad over time.

Checking the caps is a good idea.  I didn't do that at the time, but I've had to change out enough electrolytic caps to know they have a finite life.

[mdpierce8]

It worked! Thanks for all the pointers. All I did was reflow the old solder so I left the rear deck cover off for now, the cover was very sun damaged anyway. But at least I have a working key fob now.

[Psych0matt]

I should get mine working, one more thing I haven’t bothered with in years, but now that I fixed my sunroof relay might as well figure this one out as well. 

[architect]

Reviving this thread! So would the receiver be at the back under upholstery or  passenger door for my 1995 Regal GS? Can't seem to figure out how to get under the upholstery as well unless I just gotta pry and yank, which makes me nervous for this old car... 

[jiggity76]

23 minutes ago, architect said:

Reviving this thread! So would the receiver be at the back under upholstery or  passenger door for my 1995 Regal GS? Can't seem to figure out how to get under the upholstery as well unless I just gotta pry and yank, which makes me nervous for this old car... 

The receivers are mounted up in the back glass shelf area.  The upper rear seatback needs to come out...which means the shelf also needs to come out.  Then, to get the shelf out, you have to pull the rear quarter glass interior plastics that go around the glass.  GM layered these pieces.  Here's my 93 Grand Prix STE sedan.  It won't be identical, but it will be the same process and in the same location.

That black box up against the rear glass...that's the receiver.

 

 

 

Edited 4 hours ago by jiggity76

[GnatGoSplat]

1 hour ago, architect said:

Reviving this thread! So would the receiver be at the back under upholstery or  passenger door for my 1995 Regal GS? Can't seem to figure out how to get under the upholstery as well unless I just gotta pry and yank, which makes me nervous for this old car... 

 If it's a coupe, it's where @Black92GS showed a few posts up.  If a sedan, on the back deck as @jiggity76 shows.  Regal coupes had a much smaller rear deck due to the more vertical backglass.  Top is sedan, bottom is coupe.

Edited 3 hours ago by GnatGoSplat

[jiggity76]

45 minutes ago, GnatGoSplat said:

 If it's a coupe, it's where @Black92GS showed a few posts up.  If a sedan, on the back deck as @jiggity76 shows.  Regal coupes had a much smaller rear deck due to the more vertical backglass.  Top is sedan, bottom is coupe.

That's interesting.  My bad...I thought they were all in the same location.  My Cutlass coupe is also in the back shelf area.  The rear glass is allowing more space for it I'm sure than a Regal coupe.

[GnatGoSplat]

I didn't know either until @Black92GS's reply earlier in the thread.

It's also elsewhere on the convertibles since there's no rear deck.