Heated Seats not working after Headunit install/ Console Removed - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

jbsali · 10-10-2019, 02:34 AM

I recently installed a new headunit into my 2014 BRZ. Removed the centre console to wire in a USB Port and remove the Factory Power Outlet.

At some point, the heated seats stopped working. There is not heat and no light displayed on the switches.

Troubleshooting steps:
Pulled both Heated Seats fuses and found no issues.
Plugged power outlet in and its receiving power.
Double checked the plugs were properly connected to the Heated Seats
Attempted disconnecting and reconnecting heated seats and power outlet.

Is there anything that may be related specifically to the deck install that could be causing this?

Are there any other fuses or plugs for these seats that I might be missing..?

So far, no luck.

Any help would be greatly appreciated!

Tokay444 · 10-10-2019, 10:30 AM

Undo what you did and see if they come back on.

ka-t_240 · 10-10-2019, 10:56 AM

Do you have a power probe? You can try applying power directly to the switch to see if its before or after the switch you have an issue.

If you have a test like, start tracing the wires for the seats and see if you have power at the fuses/connections/switches.

Do you have any other items that are not working? Like cig lighters?

DarkPira7e · 10-10-2019, 11:57 AM

Definitely check fuses on that circuit. With the center console having been removed, there's a chance maybe something arced out and popped a fuse on the line.

acuatlsfan · 10-10-2019, 01:43 PM

briefly remember the left and right switches had different color plastic color of them...not sure interchanging them would cause them work work/not work

jbsali · 10-10-2019, 03:53 PM

Thanks for all the support guys. I will switch out the two fuses for LEFT and RIGHT heated seats. I bought a volt meter on amazon, just waiting for that to arrive.

I'll likely try disconnecting the aftermarket to OEM harnesses from the aftermarket deck if the replacement fuses don't resolve the issue. The fuses don't appear to be blown, but I'll try that anyways.

I've gone over the two plugs for the seat heaters and the connections at the plug and don't visually see any issues.

Are there any other areas I should look at in the mean time?

Grady · 10-10-2019, 05:23 PM

http://www.ft86club.com/files/BRZwiringi.pdf

Go to page 300. Power feeds the switches and then goes to the heating elements.

A) you shorted the system when removing or installing the seats and blew the fuses.
Check the fuses with a VOM.
B) you did not plug some connectors in correct. With there being separate grounds for seat heating and switch light illumination I would not think it was a ground issue. Looks like you would have to mess up 3 grounds to have nothing work.

C) if that does not fix it disconnect switch plugs.
Check for 12V on pin 2.
Check for ground on pin 3.
Check for some value of resistance on pins 4 and 1.
Report back.

Grady · 10-10-2019, 05:23 PM

http://www.ft86club.com/files/BRZwiringi.pdf

Go to page 300. Power feeds the switches and then goes to the heating elements.

A) you shorted the system when removing or installing the seats and blew the fuses.
Check the fuses with a VOM.
B) you did not plug some connectors in correct. With there being separate grounds for seat heating and switch light illumination I would not think it was a ground issue. Looks like you would have to mess up 3 grounds to have nothing work.

C) if that does not fix it disconnect switch plugs.
Check for 12V on pin 2.
Check for ground on pin 3.
Check for some value of resistance on pins 4 and 1.
Report back.

arkanist · 10-10-2019, 05:49 PM

Quote:

Originally Posted by Grady

B) you did not plug some connectors in correct. With there being separate grounds for seat heating and switch light illumination I would not think it was a ground issue. Looks like you would have to mess up 3 grounds to have nothing work.

I'm not OP but I am pretty sure this is what I did. I have no light but still have heat.

Grady · 10-10-2019, 05:57 PM

Quote:

Originally Posted by arkanist

I'm not OP but I am pretty sure this is what I did. I have no light but still have heat.

Then you have a bad switch/light or damaged ground on the wire that attaches to pin 3 at the switch.

jbsali · 10-10-2019, 10:22 PM

Hey guys! i have a new UPDATE:

I found a Light probe tool in my garage and tested in out on the battery (confirmed the tool works)

I did some poking around the switched and determined that the seats are seat heater wiring is giving power!!!!

The Hot wire is delivering power to the switch.
High Heat switch ON is receiving power.
Low Heat switch ON is receiving power.

Confirmed that The Power Outlet is working (I knew this from the start)

I'm unsure as to WHY both Lights on the switches are not functioning though.

I didn't bother replacing the seat heater fuses once I determined that the Line was hot and it was delivering power to and through the switches.

10-10-2019, 02:34 AM	#1
jbsali Senior Member Join Date: Jul 2012 Drives: 2014 Subaru BRZ (Limited) Location: Vancouver, BC Posts: 263 Thanks: 640 Thanked 69 Times in 49 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Heated Seats not working after Headunit install/ Console Removed I recently installed a new headunit into my 2014 BRZ. Removed the centre console to wire in a USB Port and remove the Factory Power Outlet. At some point, the heated seats stopped working. There is not heat and no light displayed on the switches. Troubleshooting steps: Pulled both Heated Seats fuses and found no issues. Plugged power outlet in and its receiving power. Double checked the plugs were properly connected to the Heated Seats Attempted disconnecting and reconnecting heated seats and power outlet. Is there anything that may be related specifically to the deck install that could be causing this? Are there any other fuses or plugs for these seats that I might be missing..? So far, no luck. Any help would be greatly appreciated!

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10-10-2019, 10:30 AM	#2
Tokay444 Anti stance. Join Date: Feb 2016 Drives: 17 White 860. RCE Tarmac 2. RE-71RS Location: Not Canada Posts: 1,629 Thanks: 897 Thanked 956 Times in 546 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Undo what you did and see if they come back on.

10-10-2019, 10:56 AM	#3
ka-t_240 Senior Member Join Date: May 2014 Drives: BRZ Location: Fargo, ND Posts: 968 Thanks: 124 Thanked 327 Times in 236 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Do you have a power probe? You can try applying power directly to the switch to see if its before or after the switch you have an issue. If you have a test like, start tracing the wires for the seats and see if you have power at the fuses/connections/switches. Do you have any other items that are not working? Like cig lighters?

10-10-2019, 11:57 AM	#4
DarkPira7e Rust bucket enthusiast Join Date: Feb 2017 Drives: 2013 Turbo Firestorm FRS Location: Vermont Posts: 3,932 Thanks: 3,199 Thanked 4,095 Times in 2,045 Posts Mentioned: 31 Post(s) Tagged: 0 Thread(s)	Definitely check fuses on that circuit. With the center console having been removed, there's a chance maybe something arced out and popped a fuse on the line.

10-10-2019, 01:43 PM	#5
acuatlsfan Member Join Date: Apr 2017 Drives: whiteout Location: socal Posts: 19 Thanks: 1 Thanked 10 Times in 3 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	briefly remember the left and right switches had different color plastic color of them...not sure interchanging them would cause them work work/not work

10-10-2019, 03:53 PM	#6
jbsali Senior Member Join Date: Jul 2012 Drives: 2014 Subaru BRZ (Limited) Location: Vancouver, BC Posts: 263 Thanks: 640 Thanked 69 Times in 49 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Thanks for all the support guys. I will switch out the two fuses for LEFT and RIGHT heated seats. I bought a volt meter on amazon, just waiting for that to arrive. I'll likely try disconnecting the aftermarket to OEM harnesses from the aftermarket deck if the replacement fuses don't resolve the issue. The fuses don't appear to be blown, but I'll try that anyways. I've gone over the two plugs for the seat heaters and the connections at the plug and don't visually see any issues. Are there any other areas I should look at in the mean time?

10-10-2019, 10:22 PM	#11
jbsali Senior Member Join Date: Jul 2012 Drives: 2014 Subaru BRZ (Limited) Location: Vancouver, BC Posts: 263 Thanks: 640 Thanked 69 Times in 49 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Hey guys! i have a new UPDATE: I found a Light probe tool in my garage and tested in out on the battery (confirmed the tool works) I did some poking around the switched and determined that the seats are seat heater wiring is giving power!!!! The Hot wire is delivering power to the switch. High Heat switch ON is receiving power. Low Heat switch ON is receiving power. Confirmed that The Power Outlet is working (I knew this from the start) I'm unsure as to WHY both Lights on the switches are not functioning though. I didn't bother replacing the seat heater fuses once I determined that the Line was hot and it was delivering power to and through the switches.

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