Quad relay DBC10009

[nlcrane]

Hi ,
I checked my diodes on a spare quad relay , which normally operates .But , I find that the diodes have the same value in both measuring directions .
Is there a risk here , even if the quad relay works properly ?
Do I need to change the diodes ?
Thanks

If you measure the diodes when they are still in circuit (i.e. without de-soldering one end) then you could be measuring through another component (e.g. the relay coil) which will give the same reading in both directions. I would assume, however, that if the quad relay unit is working then all the components would seem to be healthy.

[cocofredo]

Thanks , obviously it works , i wasn't sure that the best method is to have the diode out of the pcb . Thanks !

[norse_troll]

Hi lads

Pardon my ignorance, but I'm both curious and somewhat worried with reagrds of the XJ40 relays. How long may one expect relays to last, and are there some that fail more than others? If a relay should fail in the future and there are no functioning ones which can replace or be used to take parts from, how can relays be fixed in the future?
I'm just worried my cat wont be usable in the future due to shortage of parts.

Thanks in advance.

Erik

[pimgmx]

Erik,

The individual relays (ie the ones in the engine bay) are still available new.

Relays inside components like the one mentioned in this topics can be soldered off their pcbs and replaced by new items, too.

[nlcrane]

Hi lads

Pardon my ignorance, but I'm both curious and somewhat worried with reagrds of the XJ40 relays. How long may one expect relays to last, and are there some that fail more than others? If a relay should fail in the future and there are no functioning ones which can replace or be used to take parts from, how can relays be fixed in the future?
I'm just worried my cat wont be usable in the future due to shortage of parts.

Thanks in advance.

Erik

You can see that the nine different quad relays basically use only 4 different types of individual relays, namely 004-00, 015-15, 716-332-00 and the 719-030-01, each having its own contact configuration or current rating. As you can see the DBC 10006 has not been defined, as I have not been able to get hold of one in order to reverse engineer it.
Having only four types means that any failing individual relay in a specific quad module could be replaced with the same type from a similar quad or even a different quad that happens to have the same relay type on board. All you need to do is carefully de-solder a known good relay from a donor quad and replace the failing one. You will need a special de-solder tool (solder sucker) for this and a good soldering iron. Just heat the solder on joint until molten and then suck it off with the spring loaded tool and Roberto is your Spanish uncle.







Electro-mechanical relays are good for thousands of operations, but obviously, on a car, some are operated much more than others and as such wear our sooner. Sometimes just pinching a piece of wet and dry between the relay contacts to clean them up can be more than enough to ensure another few thousand trouble free operations. Just reheating the soldered joints on the PCB (Printed Circuit Board) is sufficient to rectify “dry joints” (joints that have stopped conducting), the DBC 10009 is very prone to this so check out my “how to” here :-

viewtopic.php?f=28&t=5728

[norse_troll]

Cheers for the rapid and not at least very enlightening reply, made things a lot clearer.

/Erik