There are several threads about various issues caused by relays so will try to put helpful info here.
What I have gathered (please point out any errors):
Some problematic relays are located on a mounted wire harness containing 3 banks behind the passenger headlight:
passenger wheel well ------- |(10a)[R1C][R2C]| ------- |(20a)[R1B][R2B]| -------- |(20a)[R1A][R2A]| -------- radiator
R1C - Horn (not urgent to replace unless horn is broken)
R2C- ASD - Auto ShutDown relay (may cause stalling and non-start conditions?) (will crank but not start without it)
R1B - Water Pump (might be responsible for sluggish acceleration from high post intercooler temps)
R2B - Blow by Control
R1A - A/C clutch (may replace if noticing A/C not performing properly?)
R2A - starter relay (infamous for start/stop and non-start issues) (will not crank without it)
*note (some report the two 20a fuse banks are switched in some cars. The pump relay is on the bank with white/violet cables?)
number designations R1A, R2A...etc are taken from beta romeo's diagram below
R1A and R2A are reachable from the top. The others may require access through the removable panel in the wheel well or removing part of the wheel well if you don't have the access panel.
The original relay is part 06106093AA and costs around $8.
That was later replaced by 06106094AA that costs around $40.
But as of 2023, it seems the official part that is being supplied is 06106093AA again.
I believe the heated seats and defrosters use the same relays, but located in the trunk. Have we seen a lot of those fail, or are the starter and pump relays just being stressed more? I don't see any harm in letting the heated seats and defroster relays fail before replacing.
thanks to @Beta Romeo and others in threads like this one for enlightening us:
www.giuliaforums.com
update 12/24:
diagram found by alfan with cord colors:
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What I have gathered (please point out any errors):
Some problematic relays are located on a mounted wire harness containing 3 banks behind the passenger headlight:
passenger wheel well ------- |(10a)[R1C][R2C]| ------- |(20a)[R1B][R2B]| -------- |(20a)[R1A][R2A]| -------- radiator
R1C - Horn (not urgent to replace unless horn is broken)
R2C- ASD - Auto ShutDown relay (may cause stalling and non-start conditions?) (will crank but not start without it)
R1B - Water Pump (might be responsible for sluggish acceleration from high post intercooler temps)
R2B - Blow by Control
R1A - A/C clutch (may replace if noticing A/C not performing properly?)
R2A - starter relay (infamous for start/stop and non-start issues) (will not crank without it)
*note (some report the two 20a fuse banks are switched in some cars. The pump relay is on the bank with white/violet cables?)
number designations R1A, R2A...etc are taken from beta romeo's diagram below
R1A and R2A are reachable from the top. The others may require access through the removable panel in the wheel well or removing part of the wheel well if you don't have the access panel.
The original relay is part 06106093AA and costs around $8.
That was later replaced by 06106094AA that costs around $40.
But as of 2023, it seems the official part that is being supplied is 06106093AA again.
I believe the heated seats and defrosters use the same relays, but located in the trunk. Have we seen a lot of those fail, or are the starter and pump relays just being stressed more? I don't see any harm in letting the heated seats and defroster relays fail before replacing.
thanks to @Beta Romeo and others in threads like this one for enlightening us:
Post intercooler temps high (FIXED)
spoiler : Post #33 by beta was right and that fixed my issue Hey guys I have a 17 q4 and once in a while I’ve noticed that my post intercooler temps getting hotter than usual. I use the squadra dongle to see them and confirmed yesterday with MES that they are high. Or the sensor is reading...
www.giuliaforums.com
update 12/24:
diagram found by alfan with cord colors:
