Founding Member PaulS Posted February 10, 2022 Founding Member Report Share Posted February 10, 2022 Its gone cold again and my heated seats have stopped working. Neither switch lighs up on either high or low settings Engine bay 20a Heated Seats fuse is OK. Are there any other fuses? If not, where should I start looking, preferably without dismantling half the car to trace wiring back.... 1 2 Link to comment Share on other sites More sharing options...
Moderators PTR200S Posted February 10, 2022 Moderators Report Share Posted February 10, 2022 Not sure if there is a relay for these , I would expect so.....if I recall some 2000 series accords had something behind the glove box...or is there a fuse in the internal fuse box? Too dark for me to check now but will have a look tomorrow.... I suspect Stu will know exactly where the problem is likely to be !!! Maybe along shortly 😁 Edit. Just been checking the fuse info in the manual.. the internal passenger side fuse box is showing " power seat" at TWO positions , number 2 and number 4. That maybe for two power movement front seats but in mine I only have the drivers side powered, could it be a heated seat circuit activating the relay switch side? The one in the engine compartment being the full power side ?? 1 1 Link to comment Share on other sites More sharing options...
Administrators hughezee Posted February 11, 2022 Administrators Report Share Posted February 11, 2022 Very odd, I will check the wiring diagrams and report back. 2 Link to comment Share on other sites More sharing options...
Founding Member Cryistic Posted February 11, 2022 Founding Member Report Share Posted February 11, 2022 This does sound like a faulty relay or an earth has come loose/become corroded at some point in the circuit for the seats. Make a set of long tails for a testing light and you should be able to test the wiring for continuity in situ once you know the colours and what else is in the circuit. Have you tested the fuse or just visually inspected it, sometimes they look ok but are blown anyway, might be worth swapping it out. 2 Link to comment Share on other sites More sharing options...
Moderators PTR200S Posted February 12, 2022 Moderators Report Share Posted February 12, 2022 On 2/10/2022 at 5:49 PM, PaulS said: Its gone cold again and my heated seats have stopped working. Neither switch lighs up on either high or low settings Engine bay 20a Heated Seats fuse is OK. Are there any other fuses? If not, where should I start looking, preferably without dismantling half the car to trace wiring back.... Any news ?? Managed to solve the problem? Link to comment Share on other sites More sharing options...
Founding Member PaulS Posted February 12, 2022 Author Founding Member Report Share Posted February 12, 2022 Not looked again as yetas it was cold and raining all day here. - but I had put in a new fuse. The 2 nearside dash fuses are for the driver's seat powered front / back movement and the recliner respectively as far as I can tell. Not spotted any relay - but maybe there is one. A copy of the wiring diagram would help. 1 Link to comment Share on other sites More sharing options...
Administrators hughezee Posted February 12, 2022 Administrators Report Share Posted February 12, 2022 On 2/12/2022 at 9:39 PM, PaulS said: A copy of the wiring diagram would help. Sorry for the delay Paul haven't had time to look yet... 1 Link to comment Share on other sites More sharing options...
Moderators PTR200S Posted February 13, 2022 Moderators Report Share Posted February 13, 2022 10 hours ago, PaulS said: The 2 nearside dash fuses are for the driver's seat powered front / back movement and the recliner respectively as far as I can tell. Ah, OK, that would make sense, front and back plus recliner....... Can you check if you have power at the engine compartment fusebox?? Engine compartment fuse at 20amp as you say that would suggest its the high power supply to a relay......I can't see a relay not being involved here... With the switch gear light being out it points to the low power side of the relay ???? 1 Link to comment Share on other sites More sharing options...
Administrators hughezee Posted February 17, 2022 Administrators Report Share Posted February 17, 2022 Finally 🙃 1 Link to comment Share on other sites More sharing options...
Founding Member PaulS Posted February 17, 2022 Author Founding Member Report Share Posted February 17, 2022 Thanks Stu. Once the weather improves sufficiently I will devote a day to trying to sort it all out. Seems there is a relay & the first thing to check - just need to find it.... wonder what I will have to dismantle.... but maybe the very first thing to do is byepass the relay altogether with a fused jump wire (just to prove whether or not it is the relay....... 2 Link to comment Share on other sites More sharing options...
Site Subscriber’s RevvinKevin Posted February 17, 2022 Site Subscriber’s Report Share Posted February 17, 2022 I have for years, always wondered why vehicle wiring schematics never list the location of vital components like relays and multi-way connectors etc. I assume the "drivers" seat in the schematic would be our passenger seat. 1 Link to comment Share on other sites More sharing options...
Moderators PTR200S Posted February 17, 2022 Moderators Report Share Posted February 17, 2022 Hmm, bizarre, looks like the relay is energised under ignition conditions through the drivers or passenger fuse at 7.5amps but the switch gear including the telltale is on the 20amp side.... I can't get my head around that, to late !!! Look in again tomorrow Link to comment Share on other sites More sharing options...
Founding Member PaulS Posted February 18, 2022 Author Founding Member Report Share Posted February 18, 2022 9 hours ago, PTR200S said: looks like the relay is energised under ignition conditions through the drivers or passenger fuse at 7.5amps but the switch gear including the telltale is on the 20amp side.... Maybe not so bizarre - one could easily flatten the battery if one left on the heated seats when the ignition is off ... 1 Link to comment Share on other sites More sharing options...
Founding Member Cryistic Posted February 18, 2022 Founding Member Report Share Posted February 18, 2022 Quick google found this Paul, it might not be right for our cars as we are right hand drive, but it's a starting point. 1 1 Link to comment Share on other sites More sharing options...
Moderators PTR200S Posted February 18, 2022 Moderators Report Share Posted February 18, 2022 8 hours ago, PaulS said: Maybe not so bizarre - one could easily flatten the battery if one left on the heated seats when the ignition is off ... I was thinking more along the line of usually the accessory switch is off the ignition, when switched on that fires the relay which then allows full power from the battery, in this case the 20amp circuit. It sort of looks like the switches are run off the 20amp circuit with the relay always hot when the ignition is on, as you say. I must be missing something but the relay , right side , just has a 7.5amp fuse (fuse 3) for both driver and passenger supplying one side of the relay to earth. If that is right and the relay activated by the ignition then maybe that fuse has gone as both sides are off and are run through the one relay. The left side shows the full power 20amp fuse into the switches then to the seat heaters..the seat heater must be low power, maybe 8 amps each ? Also, my fusebox diagram shows fuse 3 as not used ....unless it's used for the seat heater which is not standard ? When I get a chance will check my fuse box again to see what is in location 3. Anyway , somewhere is a relay !!!!! Link to comment Share on other sites More sharing options...
Moderators PTR200S Posted February 20, 2022 Moderators Report Share Posted February 20, 2022 On 2/18/2022 at 4:47 PM, PTR200S said: When I get a chance will check my fuse box again to see what is in location 3. My fuse location three has a 7.5amp fuse in it....was going to pull it and see if it knocks out the heated seats but the weather decided to intervene with another tornado... 1 Link to comment Share on other sites More sharing options...
Founding Member PaulS Posted February 21, 2022 Author Founding Member Report Share Posted February 21, 2022 Justhad a look at mine now theh storm has abated a bit. No fuse in position 3 (nearside) so I have no idea what that does on your car - my fuse schematic shows it unused. There is a good 7.5 amp fuse in ACC (4th from bottom) in the RH side too. I found something on the internet (www.v6performance.net/threads/heated-seats-relay-replacement.83894/) that says the heated seat relay is behind the glovebox next to the Throttle Actuator Module Control relay. Says to remove glovebox, look at just about the level of the heater controls in the centre consoel, 2 relays, the frontmost one is the one to look at -wire colours red/black,brown,black, black yellow. The power colours don't match Stu's diagram. But it seems the activating colours (black / yellow -> black do..... Taking out glovebox is a job for a warmer day! If indeed that is what I need to do! 3 Link to comment Share on other sites More sharing options...
Moderators PTR200S Posted February 21, 2022 Moderators Report Share Posted February 21, 2022 42 minutes ago, PaulS said: No fuse in position 3 (nearside) so I have no idea what that does on your car - my fuse schematic shows it unused. Must be the ejector seat...or maybe the oil slick pump.....🙃 2 Link to comment Share on other sites More sharing options...
Founding Member PaulS Posted October 23, 2022 Author Founding Member Report Share Posted October 23, 2022 Well the temporary magic rebirth of my heated seats last weekend proved short lived.... they have stopped working again! The mystery continues. Must admit that I thought it a bit bizzare that the heated seats should both suddenly have started working again without anyone really doing anything other than swapping the relay (which seemed not to have achieved anything). Just for the record, the drivers door actuator which had also stopped working last weekend and started working properly again the following day is still working just fine. Well it would, thanks to Stu I have a good spare for that ready to install.... 1 1 Link to comment Share on other sites More sharing options...
Moderators PTR200S Posted October 23, 2022 Moderators Report Share Posted October 23, 2022 That's bizarre re seats but suggests to me that there is , perhaps, a connection not doing its job properly or a wire that is chaffed through internally somewhere. Now the seats have stopped working again can you do continuity tests on the supply wires ??? Door lock...who knows !!!! Got a TVR with the same intermittent door lock problem ,,,,a solenoid possibly, but on the basis you can get in through the roof who needs a door lock !!! 1 Link to comment Share on other sites More sharing options...
Founding Member PaulS Posted October 23, 2022 Author Founding Member Report Share Posted October 23, 2022 Stu seemed to think it could be the multiplexor playing up, but needs to investigate a little more. However at present I think Stu has his hands full enough trying to sort out Ruby.... As both seats started and stopped working in tandem, it would seem to be power supply issue. Presumably both seat heaters are supplied from the same relay by the same power wire. But the signal to the relay telling it to switch on might not be delivered - and as far as I understand it - that is (in part) what the multiplexer delivers. 1 1 Link to comment Share on other sites More sharing options...
Administrators hughezee Posted October 23, 2022 Administrators Report Share Posted October 23, 2022 I am starting to think maybe you have an earthing issue 😐 since so many systems are affected randomly.🙃 2 Link to comment Share on other sites More sharing options...
Founding Member PaulS Posted November 3, 2022 Author Founding Member Report Share Posted November 3, 2022 The heatedseats started working again yesterday, but for no apparent reason... I had fiddled aroud a bit a couple of days earlier, but they did not work after that, but yesterday they just worked again without me doing anything.... An ongoing mystery why they stop & start like this but, no doubt temporarily, I am happy again and will not poke & prod around again with them unless they stop working.... 1 Link to comment Share on other sites More sharing options...
Founding Member Cryistic Posted November 3, 2022 Founding Member Report Share Posted November 3, 2022 it sounds like a couple of chafed wires somewhere in the loom, different humidity and slight moves of the loom may cause them to come in and out of contact, it's a difficult fault to find though. Checking the earths is a good start, clean and re attach. 2 Link to comment Share on other sites More sharing options...
Founding Member PaulS Posted December 5, 2022 Author Founding Member Report Share Posted December 5, 2022 Amazingly, both heated seats are still working.... fingers crossed for the rest of the winter..... earths still looked looked good but redone and greased for good measure though 2 Link to comment Share on other sites More sharing options...
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