No start after pulling the mir relay. - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Rob37072 · 07-17-2018, 09:59 PM

Car won't start after I accidentally pulled the mirror heater relay. It shut off as soon as I pulled it. I was trying to diagnose a cooling fan issue and I pulled the wrong relay. All the electronics work except the starter doesn't even click and there dash doesn't illuminate other than the door open light. The supercharger coolant pump also won't come on. Fuses all show continuity (except one of the fan fuses but I replaced that one)

No fuel pump noise
No CEL
No Link on an OBDII scanner
Dash doesn't "Wake Up" when turning the car on.

humfrz · 07-17-2018, 10:23 PM

Quote:

Originally Posted by Rob37072

Car won't start after I accidentally pulled the mirror heater relay. It shut off as soon as I pulled it. I was trying to diagnose a cooling fan issue and I pulled the wrong relay. All the electronics work except the starter doesn't even click and there dash doesn't illuminate other than the door open light. The supercharger coolant pump also won't come on. Fuses all show continuity (except one of the fan fuses but I replaced that one)

Did you check that big fuse that's up on the battery?

humfrz

Rob37072 · 07-18-2018, 12:16 AM

Quote:

Originally Posted by humfrz

Did you check that big fuse that's up on the battery?

humfrz

I did. Looks ok. Both bolts off the post have continuity. Also the headlights and radio are fine...

humfrz · 07-18-2018, 05:09 AM

Does the starter have a relay? (I don't know)

If it does, did you check it?

humfrz - ain't much help -

steve99 · 07-18-2018, 10:25 AM

link to wiring diagram

check the 10A ECU IG1 7.5A MPX-B 15A HAZ 10a ECU ACC fuses they common to mirror heater and dash imobilisier

Rob37072 · 07-18-2018, 01:54 PM

Quote:

Originally Posted by steve99

link to wiring diagram

check the 10A ECU IG1 7.5A MPX-B 15A HAZ 10a ECU ACC fuses they common to mirror heater and dash imobilisier

Thanks for the reply. Just went out and rechecked. All of those fuses look fine, have continuity across them and have 12v on the volt meter against a ground. (Battery ground or bolt in the door jamb)

Leonardo · 07-18-2018, 01:57 PM

I am old school, so I would disconnect the battery for a minute. This could reset the car.

When I unplugged the ABS fuse; I had to disconnect the battery cable to have it recognize that I had plugged the ABS fuse back in.

Brz_racer · 07-18-2018, 01:58 PM

You need another person to start the car and while they are doing that check to see if you even have power going to the starter wires...

Rob37072 · 07-18-2018, 02:06 PM

OBDII scanner says "No Link"

did I brick the ECU?

Rob37072 · 07-18-2018, 02:06 PM

Quote:

Originally Posted by Leonardo

I am old school, so I would disconnect the battery for a minute. This could reset the car.

When I unplugged the ABS fuse; I had to disconnect the battery cable to have it recognize that I had plugged the ABS fuse back in.

Ya, i left the negative side off overnight hoping... no dice.

Rob37072 · 07-18-2018, 02:07 PM

Quote:

Originally Posted by Brz_racer

You need another person to start the car and while they are doing that check to see if you even have power going to the starter wires...

I'm sure it's not just power to the starter. Too many other things don't work. With the key "on" but not turned to crank it doesn't even wake the dash up with the engine light and all that.

Brz_racer · 07-18-2018, 02:12 PM

Quote:

Originally Posted by Rob37072

OBDII scanner says "No Link"

did I brick the ECU?

It kinda sounds like an ECU problem although I'd be rather surprised if pulling a relay would brick the ECU completely. You said the ECU fuse(s) are all good? Did you put a meter on them or just visually look? Sometimes fuses are bad even if they dont look it.

Razorlor · 07-18-2018, 02:13 PM

There is a fusible link in that circuit for the alternator.

The issue I have is that removing a relay shouldn't blow any fuses whatsoever.

I'm assuming you have a multimeter, so do this. Put one lead on the battery positive terminal and the other on the power wire of the alternator and let me know what it reads. (Have it set to DC volts)

Rob37072 · 07-18-2018, 02:13 PM

Quote:

Originally Posted by Brz_racer

It kinda sounds like an ECU problem although I'd be rather surprised if pulling a relay would brick the ECU completely. You said the ECU fuse(s) are all good? Did you put a meter on them or just visually look? Sometimes fuses are bad even if they dont look it.

I put a meter on them, visually inspected them and checked both sides of the fuses for 12v... all checked out ok.

07-17-2018, 09:59 PM	#1
Rob37072 Member Join Date: Jun 2017 Drives: Silver FR-S Location: Nashville TN Posts: 28 Thanks: 2 Thanked 10 Times in 7 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	No start after pulling the mir relay. Car won't start after I accidentally pulled the mirror heater relay. It shut off as soon as I pulled it. I was trying to diagnose a cooling fan issue and I pulled the wrong relay. All the electronics work except the starter doesn't even click and there dash doesn't illuminate other than the door open light. The supercharger coolant pump also won't come on. Fuses all show continuity (except one of the fan fuses but I replaced that one) No fuel pump noise No CEL No Link on an OBDII scanner Dash doesn't "Wake Up" when turning the car on. Last edited by Rob37072; 07-18-2018 at 02:10 PM.

07-18-2018, 01:57 PM	#7
Leonardo Country Boy 4 Life Join Date: Jul 2012 Drives: 19' & 06' Ridgelines, 13' FR-S Location: EUGENE Posts: 5,228 Thanks: 6,719 Thanked 5,293 Times in 2,720 Posts Mentioned: 47 Post(s) Tagged: 1 Thread(s)	I am old school, so I would disconnect the battery for a minute. This could reset the car. When I unplugged the ABS fuse; I had to disconnect the battery cable to have it recognize that I had plugged the ABS fuse back in. __________________ I LIKE TIRES!

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07-18-2018, 05:09 AM	#4
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 30,407 Thanks: 29,792 Thanked 32,807 Times in 16,828 Posts Mentioned: 715 Post(s) Tagged: 2 Thread(s)	Does the starter have a relay? (I don't know) If it does, did you check it? humfrz - ain't much help -

07-18-2018, 01:58 PM	#8
Brz_racer Senior Member Join Date: Aug 2016 Drives: Subaru BRZ Location: Seattle Posts: 116 Thanks: 14 Thanked 45 Times in 33 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	You need another person to start the car and while they are doing that check to see if you even have power going to the starter wires...

07-18-2018, 02:06 PM	#9
Rob37072 Member Join Date: Jun 2017 Drives: Silver FR-S Location: Nashville TN Posts: 28 Thanks: 2 Thanked 10 Times in 7 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	OBDII scanner says "No Link" did I brick the ECU?

07-18-2018, 02:13 PM	#13
Razorlor Member Join Date: Dec 2017 Drives: 2017 BRZ Limited, Perf Package Location: STL Posts: 50 Thanks: 5 Thanked 13 Times in 8 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	There is a fusible link in that circuit for the alternator. The issue I have is that removing a relay shouldn't blow any fuses whatsoever. I'm assuming you have a multimeter, so do this. Put one lead on the battery positive terminal and the other on the power wire of the alternator and let me know what it reads. (Have it set to DC volts)

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