Starter relay location

[chuckrs4]

The relay I got given from tps was marked 381 and was purple? What is that for or they send me the wrong one? Wasn't sure where it was to check and it was not returnable.

[mikep99]

Thread revival!!
Just changed my relays under the ecu.
I was expecting to see 1 maybe 2 614 relays and 1 purple 381 relay.
However, as per a couple of posts previous to this, there wasnt a 381 relay.
I've changed the 2 614s to new 644s so see how we get on with that.
Anybody got any clarification on the lack of a 381 relay?
Perhaps one of the 614/644s was in place of the 381?
As far as I'm aware, the only difference is that the 381 is rated at 40amp and the 614/644 at 70amp.
The green relays in the pic are 644s..

The job itself was OK, bit of a bugger getting the ecu cover off. Used a ball joint separator to get the wiper off. About 2 hours in total incl. a couple of smoke breaks.

Cheers Mike

Sent from my PRA-LX1 using Tapatalk

[Daytona]

These are mine before and after:

Have you looked into the ones under the steering wheel?
I ’think’ one is for the clutch switch, the other for one touch starting or something along those lines, I did work it out on ELSAWIN but that was a while ago:

[mikep99]

looks like your relays under the ecu are the same as mine so thats good...
Not checked the ones under the steering column (yet) - i'll investigate - thanks.
I've got the upper and lower clutch switches to go on if needed but it starts on the button (assuming it starts) so dont think it'd be clutch or button related.
And its had a new starter last week as well.

I'll see what its like over the next few days and go from there.
Cheers for the photos - you've put my mind at ease now

Mike

[Daytona]

No probs mate

[Surrey Sam]

Purple/Pink 381's replaced the 373 relay I believe. But not found anything on the the 645 superceeding the 381 which is quite possible.

[Surrey Sam]

Have you looked into the ones under the steering wheel?
I ’think’ one is for the clutch switch, the other for one touch starting or something along those lines, I did work it out on ELSAWIN but that was a while ago:
E9E38342-B0DA-47AF-B69A-F739B4267B9E.png857FE750-1D94-480F-8022-01131BE37D8B.png

Those ones you've replaced with the 645 relays are starter relays 1 & 2

Socket 3 (J695 green coloured)
Socket 4 (J53 brown coloured)

[mikep99]

Just checked mine underneath the steering wheel.
I can see that they're all 373's but its going to be a struggle to get to them as there's a load of aftermarket stuff in the way...
I've ordered a couple of 645's in the meantime.
Did a bit of digging and it looks like 373, 381 & 645 relays are the same - 40amp with same layout.

Cheers
Mike

[mikep99]

just a bit of confirmation...
Changed the 2 starter relays this morning - below is a pic of the 373, 381 & 645 relays.
Hopefully you can make the relay diagrams out, but I'm happy they all have the same function..

Cheers
Mike

[GhiniRS4]

Have you looked into the ones under the steering wheel?
I ’think’ one is for the clutch switch, the other for one touch starting or something along those lines, I did work it out on ELSAWIN but that was a while ago:
E9E38342-B0DA-47AF-B69A-F739B4267B9E.png857FE750-1D94-480F-8022-01131BE37D8B.png

Those ones you've replaced with the 645 relays are starter relays 1 & 2

Socket 3 (J695 green coloured)
Socket 4 (J53 brown coloured)

Hi everyone

I came across this thread as I'm doing a reaserch on ordering replacements for my starting relay.
I'm having trouble finding the PART CODE for these two sockets (image attached):

Socket 3 (J695 green coloured)
Socket 4 (J53 brown coloured)


Just wondering if anyone here may be able to help me identify.
Much appreciated !

[GhiniRS4]

Hi everyone

Updating, finally I found the relay location by OEM parts with Number. please see below:

Got that from here: http://fusesdiagram.com/audi/fuse-bo...udi-a4-b7.html

Correspondence with parts code:
R1 Fuel pump relay, additional relay, fuel pump
Part code: 8E0 951 253
Note:614

R2 Servotronic control unit
Part code: 8E0 907 307 C / 2011.05 - 2006.07
Part code: 8E0 907 307 H / 2007.07 - 2006.08
Note:642

R3 Starter motor relay
Part code: 431 951 253 G
Note:381 -12V/40A-

R4 Starter motor relay
Brake servo relay
Part code: 431 951 253 G
Note:381 -12V/40A-

R5 Heated rear windscreen relay
Part code: 8K0 951 253
Note:643 or 373

R6 X contact relief relay
Part code: 7M0 951 253 A
Note:370 -40A-
Part code: 8K0 951 253
Note:643 or 373

R7 Not used
R8 Horn relay
R9 Not used

Check my car relay the photo with mark:

※ My car is left-hand drive, but the relay arrangement doesn't change.

If the above information is wrong, any comments are welcome.

[norfolk_boi]

Hopefully you can make the relay diagrams out, but I'm happy they all have the same function..

Maybe have a closer look... similar, but not the same.

The Purple 381 starter relay which is normally in space No. 3 under the dash has an extra diode between the windings and pin 85.

Think its to do with the way the starter solenoid current has to pass through both relays, and the output current is also fed back to the ECU so it can monitor it, so it knows if a relay is sticking. Think the extra Diode comes into play so the ECU can identify which relay is sticking, and throw the relevant fault code.

Its not a normal back EMF diode like you would normally see across the windings on other relays, as all these use parallel resistors to supress back EMF instead, the extra Diode in the Purple ones is fairly odd set up, and is in series between the windings and the pin.

It may well work fine with a different relay in there unless one relay starts sticking, and it will probably either throw no fault code, or will throw faults for both relays.