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#1
03-06-2014, 09:53 PM
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Relays on circuit board of ACC-II controller
I have searched this site but I have not seen where someone has replaced a bad relay on their ACC controller, also known as the CCU. Mine is an ACC-II for an 84 300D.
Does anyone know of a source and model # to use for replacing a relay on the circuit board? Thanks
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1984 300D 398K-daily driver 1998 Honda Accord 102K -wife's daily driver 1991 Volvo 740 289K 2000 Toyota Corolla 143K 
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#2
03-07-2014, 10:59 AM
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Are you sure it is a defective relay? Usually the solder cracks around the 5 terminals on them. Resolder all relays as well as the joints between the main board and the two boards that are mounted at right angles to it. Add a bit of fresh solder but take care not to bridge between traces.
Also a must for these cars is to add a series fuse in the auxiliary water pump circuit as it can badly burn the pushbutton assembly if (when) it seizes. I think I added a 1 or 2 amp fuse. If you indeed have a defective relay, probably someone has a used one that they can send you. If you can't find one I can give you one for the price of shipping but it would be coming from Canada so hopefully you can find one closer.
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#3
03-07-2014, 12:52 PM
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For your reference. '84 should have the ACC-III.
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro"
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#4
03-07-2014, 12:55 PM
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My recommendation would be to get another relay from another used control unit.
I believe the 126 unit is similar and would afford you some relays. Here are some pics of a set that I repaired for a customer: W126 Climate Control Repairs - Imgur
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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#5
03-07-2014, 08:16 PM
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Sorry, yup it is the ACC-III.
I will be re-soldering all the connections. I thought that I had 1 bad relay, but further testing shows it is OK I think. I also just noticed it is a Bosch relay, with a part number on it. I need to see what I can dig up on the part number. I do have a spare board that I can scavenge for parts if needed. Thanks for all the help.
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1984 300D 398K-daily driver 1998 Honda Accord 102K -wife's daily driver 1991 Volvo 740 289K 2000 Toyota Corolla 143K
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Linear Mode
