Relay 1?

I have '05 545i and got a chance to use a friends snap-on solus. Was going through the diff selections and under "voltage" I get a "relay 1 faulty" reading...does anyone know what/where relay 1 is?

From what I researched, its the DME relay....so I went ahead and got another relay and opened up the fuse box under the passenger cabin air filter...I only saw a brown relay and salmon color. No other relay....

What color relay did you buy, square black one? If yes in trunk electrical panel right above the battery.

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Originally Posted by racooper3

What color relay did you buy, square black one? If yes in trunk electrical panel right above the battery.

Sent from my DROID RAZR HD using Bimmer App

Well I thought relay 1 was the DME relay so I went ahead and got one from BMW, it's a blue one. I know the black one you're talking about by the battery but I already replaced that one right before I got a new alternator put in.

Could it go bad again? And is that relay 1???

Originally Posted by E60black

I have '05 545i and got a chance to use a friends snap-on solus. Was going through the diff selections and under "voltage" I get a "relay 1 faulty" reading...does anyone know what/where relay 1 is?

From what I researched, its the DME relay....so I went ahead and got another relay and opened up the fuse box under the passenger cabin air filter...I only saw a brown relay and salmon color. No other relay....

I am not familiar with the Snap-On Solus unit, but I am guessing it is a standard OBD II scan tool. Was a generic P-code associated with the error?

Were you experiencing problems with your 545i or did you just hook up the Solus unit out of curiosity?

I haven't seen any reference in Bentley's repair manual or other sources that identify what "Relay 1" is. Maybe others can chime in.

What was the part number of the relay you ordered?

There are relays in the E-box that you mention, as well as in the fuse panel behind the back of the glove box and as you acknowledge, in the trunk.

If you haven't been experiencing problems there is no need to start swapping relays. If you are experiencing problems list the symptoms as an aid to others helping you troubleshoot the problem.

There was no CEL however I've been having issues with fuel cutting off when I feather touch the pedal. I tried to push the the pedal harder to see if CEL might generate but nothing.

The reason I hooked up a snap on was because my airbag light came on along with seatbelt light after a cold start. I checked the airbag options and it gave a code for something with the battery cable (friend was too quick to clear it before I could take a picture)...then I went under voltage and it said relay 1 faulty. I thought they were both connected in some way.

I also need to change my o2 sensor.

Originally Posted by E60black

There was no CEL however I've been having issues with fuel cutting off when I feather touch the pedal. I tried to push the the pedal harder to see if CEL might generate but nothing.

The reason I hooked up a snap on was because my airbag light came on along with seatbelt light after a cold start. I checked the airbag options and it gave a code for something with the battery cable (friend was too quick to clear it before I could take a picture)...then I went under voltage and it said relay 1 faulty. I thought they were both connected in some way.

I also need to change my o2 sensor.

For the airbag light and seatbelt light I would look for over and under voltage, which can generate some strange things in an E60. Whenever lights or codes come and go the first thing I look at is the battery and alternator.

For throttle hesitation I would suggest you look at your MAF sensor or a vacuum leak first. If the engine runs at all the fuel pump relay is probably good.

Originally Posted by bimmerfan52

For the airbag light and seatbelt light I would look for over and under voltage, which can generate some strange things in an E60. Whenever lights or codes come and go the first thing I look at is the battery and alternator.

For throttle hesitation I would suggest you look at your MAF sensor or a vacuum leak first. If the engine runs at all the fuel pump relay is probably good.

Well I had the infamous voltage regulator issue which caused all systems to light up but airbag never came up then. This was about a month ago. Replaced the alternator with a brand new Valeo one. Not a rebuilt, came in the Valeo box with packaging. Also went ahead and got a new AGM battery (Duracell) and registered it.

Car fires right up beautifully on a cold start, it's just when it warms up is when these issues occur. Also if I make a quick trip to the store and come back to restart the car, the idle will sometimes drastically move up and down -- as high as 800-1000rpm.

Took MAF off and the thing looks brand new. Barely any dirt on it. Only other issue I have is the vacuum pump leak. Maybe a few drops every couple days....

Originally Posted by E60black

Well I had the infamous voltage regulator issue which caused all systems to light up but airbag never came up then. This was about a month ago. Replaced the alternator with a brand new Valeo one. Not a rebuilt, came in the Valeo box with packaging. Also went ahead and got a new AGM battery (Duracell) and registered it.

Car fires right up beautifully on a cold start, it's just when it warms up is when these issues occur. Also if I make a quick trip to the store and come back to restart the car, the idle will sometimes drastically move up and down -- as high as 800-1000rpm.

Took MAF off and the thing looks brand new. Barely any dirt on it. Only other issue I have is the vacuum pump leak. Maybe a few drops every couple days....

I would still consider cleaning the MAF even though it looks good. The vacuum pump leak is probably not as important as an actual vacuum leak just after the MAF. You may want to search the forums for "smoke test" or other methods of finding vacuum leaks.

This is thread for purchase of o-rings, seals to repair vacuum pump leaks.
http://www.bimmerfest.com/forums/sho...d.php?t=595235

Ill try giving the smoke test a shot. Why can't the darn thing just throw a CEL so I can fix it and move on.