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Old 07-08-2004, 07:19 PM   #1
ImprezaRSfan!
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Join Date: Dec 2001
Chapter/Region: MAIC
Location: Springfield, VA
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99rs ej207 spec-c
its for sale

Question subaru main relay

Apparently mine blew. Im not getting power input to ecu and my cel is off which makes sense.

I ordered it on subaruparts.com , Will most likely take a week or more. I dont want to sit around for a week, is there anywhere i can go that has one ?

most dealerships wont
junkyard last resort
i went to an electric store and they didnt have any that matched the pins.

its subaru part #25229aa01
Jideco 12v main relay.

Anyone know where i can source one?
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Old 07-08-2004, 07:26 PM   #2
Mulder
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How do you know the relay itself is NG? I've never heard of one going bad. Have you checked for voltage at the coil, checked fuses etc.?
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Old 08-03-2008, 01:08 AM   #3
flying lotus
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Legacy Subaru Outback Main Relay

On the subject of changing the main relay, my bypass air control valve remains energised when you turn the key off...Remove the ground from the battery, it de-energises, hook it back up and the valve remains de-energised. Turn the key back on and it does the same thing again. I see on the schematic that the "Main Relay" is supplying this power. I did a thorough test of what I think is the "Main Relay", but I may be looking at the wrong thing, and it checks out good. Is this relay kinda above the passenger's right foot? Blue or Yellow? About 1.25" square?
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Old 08-03-2008, 11:12 AM   #4
Cougar4
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Quote:
Originally Posted by ImprezaRSfan! View Post
Apparently mine blew. Im not getting power input to ecu and my cel is off which makes sense.

I ordered it on subaruparts.com , Will most likely take a week or more. I dont want to sit around for a week, is there anywhere i can go that has one ?

most dealerships wont
junkyard last resort
i went to an electric store and they didnt have any that matched the pins.

its subaru part #25229aa01
Jideco 12v main relay.

Anyone know where i can source one?
Relays can go bad but like Mulder stated, I would check fuses under the dash for a problem and also verify where voltage is getting to using a test probe before stating the relay is bad.
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Old 08-03-2008, 11:15 AM   #5
Cougar4
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Quote:
Originally Posted by flying lotus View Post
On the subject of changing the main relay, my bypass air control valve remains energised when you turn the key off...Remove the ground from the battery, it de-energises, hook it back up and the valve remains de-energised. Turn the key back on and it does the same thing again. I see on the schematic that the "Main Relay" is supplying this power. I did a thorough test of what I think is the "Main Relay", but I may be looking at the wrong thing, and it checks out good. Is this relay kinda above the passenger's right foot? Blue or Yellow? About 1.25" square?

There may be a problem with the alternator causing that to happen. Try disconnecting the small wires to the alternator and see if the buzzing quits. If it does then the alternator needs to be replaced.
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Old 08-21-2008, 04:44 PM   #6
flying lotus
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Thumbs up About my Main Relay Problem....

My original post goes like this...
"On the subject of changing the main relay, my bypass air control valve remains energised when you turn the key off...Remove the ground from the battery, it de-energises, hook it back up and the valve remains de-energised. Turn the key back on and it does the same thing again."

These sensors remain energized for two minutes and 30 seconds AFTER the key is turned off, i guess so they are up and running if the engine quits and the car needs to be ready for a re-start in a hurry. I did alot of head scratching over this.
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Old 08-21-2008, 06:48 PM   #7
Cougar4
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Some things go into a sleep mode when the ignition is turned off. If you still are having a problem with no power to the ECU coming from the main relay and the relay is working along with suppling power on the proper connections then there is a wire connection problem to the ECU.
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Old 08-22-2008, 03:37 PM   #8
Haelan
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The relay can be tested easily enough. Apply 12VDC to the coil. When the coil activates the 2 normally open contacts close. So ohming a contact with no power to the coil yields infinite ohms. After powering the relay coil the two contact points should be a dead short or close to 0 ohms each.

Relays fail all the time in my line of work. Internally the coil plunger closes the contacts mechanically and they do wear out (they also have springs). Sometimes a normally open contact will stay permanently closed due to arc welding from current over time.
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