jsinga

I haven't found a replacement ABS Module Relay.
1636973 is the 5 blade Bosch relay down by the controller. This for a 87 ABS. I tried Advanced Auto Parts, NAPA, Chevrolet dealer, Autopartsshop.com, RockAuto.com; all say it is discontinued and they have no source. Dealer parts said try Vintage Parts. Their site didn't list it.
Mine has an open coil. I threaten to try and fix it!

JS

Keystring

That relay is used on a lot of different cars. Even fords. Although the numbers may be different.

Does it look like this?

http://cgi.ebay.com/ebaymotors/RY624-CHEV-OLDS-PONTIAC-ANTI-LOCK-BRAKE-RELAY-12088595-/270413070186?pt=Vintage_Car_Truck_Parts_ Accessories&hash=item3ef5dfff6a

toptechx6

See the link:

ddahlgren

Post some good pictures of it and I will match it up for you. Relays come in standrd base styles so it is no big deal to get one. Worst case is to splice one in even if the socket is built in there are ways. Look at the fuse panel for your car or better yet the wiring diagram and that will tell a lot as well.

cuengineer

It looks like the first and last pic on the NAPA web site link shown below even though it is not available now. It has 5 flat prongs even though only 4 have connections.

http://www.napaautoparts.com/Search/...+50012+2012030

ddahlgren

Find out what fuse size is in the ABS fuse position and then do a search on Potter and Brumfield or Hella

If it has a Bosch part number that helps a bunch too. If you get in a jam let me know and rather certaing I can find one. It looks like a 'standard base' relay as opposed to a micro or mini base size.

Dave

cuengineer

Two fuses go to the ABS relay. The control circuit is the Gages fuse (10 amp) and the controlled circuit is the Brakes fuse (10 amp). The four active flat prongs are labeled 15, 30, 31 and 87. The fifth prong is not connected to any wires. The wiring schematic for the relay contains a diode. I looked at both web sites you mentioned but could find nothing of benefit. I also found a Tyco Electronics 12 VDC Tyco 5-Pin Relay SPDT 20/30A (Formerly Bosch) which has similar prongs but have not found the schematic for it <http://www.parts-express.com/pe/showdetl.cfm?Partnumber=330-070>.

John

ddahlgren

There is no complicated schematic.
You should have 2 termials going to the control coil to operate the relay with the diode across them.
You have a single terminal for power to the two output pins one is normally open the other normally closed.
Do you have anything different than that?

cuengineer

As you say, the schematic is relatively simple. There are two things that make finding a replacement difficult.

1) The typical Bosch SPST style relay is normally open and has 5 prongs in the same arrangement as the 1636973 and can handle the 10 amps with no problem. However, the prongs are labeled 30 and 87 (powered ones) and 85, 86 and 87A (85 and 86 in control circuit and 87A -center prong is not used). For the 1636973, the 30 and 87 are still power circuit but the control circuit is the 31 and 15 prongs AND the 15 prong is the center prong and the non-numbered prong is on the extreme right, i.e. the center and right hand prongs are reversed in use.
2) Also, the schematic shows a diode between old relay prongs 13 and 31 (new 85 and 86) to prevent the voltage spike on relay turn-off.

So it looks like the relay will need a new socket to plug a replacement into and then short jumper wires to connect the new relay 85 prong to the old 15 socket -- assuming that I can find one with the necessary diode to predict the solid state parts of the brake. If anyone can direct me to such a relay, I would greatly appreciate it.

ddahlgren

Here is one source

http://www.rallylights.com/hella/Hel...%20Relays.aspx

Your best bet is the verify the coil supply voltage to make sure it is 12V and probably is. The just buy a general purpose relay that has the correct current rateing and either repin your socket or buy a socket with the relay and connect it up however is needed. Your only other choice is to call the various salvage yards and see if they have one. At the end of the day it is a automotive relay with a diode that does not have to be high temp or potted so a very generic thing.

https://www.relayspec.com/specs/001600/az973.pdf

Dave

cuengineer

Actually a bit more complicated than the generic relay because it actually has 3 diodes according to the schematic. (Took a bit of effort to get it cleaned off where my old eyes could read all of them.) One between the control circuit (31 and 15), one diode between the control circuit 31 and power circuit 87, and one diode between the power circuit 15 and the magnetic coil. I haven't seen any relays like this in any catalogs or on-line. I guess the other diodes could be attached externally but would be kind of messy wiring and not sure what size they need to be.

ddahlgren

I think Way-tek wire has some diodes that go into mini fuse holders if that helps to clean things up if you have to go that route. In the past I have epoxied 1N4001 diodes into various connectors as well. Last resort you could always solder up a little circuit board with them and cover it in some heatshrink. What about a later model relay and possibly change the socket?

samsonb

Might want to look at AR456 at Napa online. It says "1636973" on the relay:

cuengineer

Thanks for the message. I forgot to mention that I had checked with NAPA online. They did have this listing, but unfortunately when I checked at the local store about availability, it showed up as no longer being available to order. They didn't seem to have any idea whether it might ever be available again.

RtStuf

Was there a resolution to this ABS relay problem?

jsinga

I took mine apart and spliced in replacement parts. I saw how someone with a ZR-1 did it.
I found the correct relay new. For like $95. The ABS is also used on a 944 Porsche

JS