2015 QX70 Climate Seat

[SamB101]

Hi all

I’ve just bought a 2015 QX70 3.0 diesel, and it’s a very impressive car. I needed an SUV but wanted something a bit different, and here in the UK these are one of the rarest cars on the road!

There’s one issue with the car and that’s the drivers climate seat. I’ve searched through the forums and can’t find a comparable problem so thought I’d start a new thread. The switch lights up when cooling or heating, and cooling works correctly, but heating doesn’t. I can hear the fan come on VERY quietly irrespective of low/medium/high heat selection, but it seems to keep restarting itself? There’s no heat produced at all and I’m wondering if anybody has had the same issue and how you fixed it?

I’m thinking it might be the control module or maybe a relay? I’ve unbolted the seat and had a good look underneath and can’t see and loose connectors or burned out wiring and I’ve checked the fuse in the trunk. The blower motor doesn’t seem to have a filter on it though, which strikes me as odd. There’s a round piece of mesh that seems to be moulded directly in to the blower housing where I’d expect the filter to be?

Thanks very much in advance,

Sam

 

[Edward Skinner]

Hello to another UK owner!

I have a 2012 FX 30d. During lockdown etc and after periods of lack of use I've noticed the seat heating tends to keep trying to restart when the car has just been started. It operates normally after a few minutes Could it be battery related, low charge, possibly a sign the battery's on the way out? Might be worth giving it a charge to see if it has any impact?

Ed

 

[la_fx35]

Perhaps start with the FSM? Infiniti Service Manuals - NICOclub

 

[Mcontrols]

These seats are heated/cooled thermoelectrically, they use a “Peltier” heater/cooler device. The voltage polarity is reversed to switch between heating and cooling. Since it’s cooling I’d say it’s likely in the switch or relay if there is one. Mine acted up not cooling. I rapidly rotated the switch from end to end several times. Viola, working fine. (happened 2 years ago).

 

[themadnewfie]

It sounds like I have a similar issue but ill lay it all out for your feedback

09FX35 - have had the car for 6 years without issue

At the beginning of winter my wife started to complain that the drivers side heated seat wasn't throwing any heat

Troubleshooting
- confirmed that the fan does spool up but after 10-60 seconds it will stop (the light also goes off)
- confirmed this happens on all 3 speed settings
- confirmed that the cooling setting works fine on all 3 speeds
- pulled out the seat filter and it does the exact same thing
- once the light goes out - I need to turn the car off/on to get the fan to spool back up (once the heater trips out the cooler won't work either)

No other electrical issues or gremlins to report - passenger seat works mint

Is their anything else I can do to isolate the issue down to the correct part that needs to be fixed / replaced?

 

[EdBwoy]

Typically, when your cooling function works but the heat faults out, it's an issue with the climate controlled seat (CCS) control unit. It's also sometimes referred to as the CCS module.

At the rear bottom of the seat, it is the box beside the seat blower.
Thankfully, there's one under each seat, so you can just switch the driver and passenger one for troubleshooting purposes.

 

[themadnewfie]

Typically, when your cooling function works but the heat faults out, it's an issue with the climate controlled seat (CCS) control unit. It's also sometimes referred to as the CCS module.

At the rear bottom of the seat, it is the box beside the seat blower.
Thankfully, there's one under each seat, so you can just switch the driver and passenger one for troubleshooting purposes.

Thanks for the tip - I gave it a try today and it still does the same thing (cooling only)

The good news is that it's really clean under there now .. figured I'd take advantage of having the seats removed

Any other recommendations knowing that the CCS wasn't the answer?

 

[nima]

Does anyone have the part number for the CCS control unit? I am having issues with the passenger side. Turns on for a moment after I start the car, then goes off - for both heating and cooling functions.

 

[J3FF3R$0N]

873D6-1CA0A (09-13)
873D6-1CA1A (14+)

 

[nima]

Are you sure?
I called the dealer today and was provided with 873D7-1CA0B. Its $316 + HST

Then I have to find out if I can replace it without removing the seat.. oh boy

 

[J3FF3R$0N]

Are you sure?
I called the dealer today and was provided with 873D7-1CA0B. Its $316 + HST

Then I have to find out if I can replace it without removing the seat.. oh boy

That part number is for what they call a "thermal electrical device" for the seat back, there is also one of these in the lower part of the seat, then you would have the control box which I mentioned before

 

[J3FF3R$0N]

 

[ryus]

For the heating function of the seats during cold weather, it may not run immediately after turning to the hot side, it takes some time to warm up then will blow warm air. Similar to the main heating of the car, it needs the engine to be of sufficient heat to start blowing heat through the vents.

 

[nima]

Yes, but it has to stay on in the first place. It turns on when you switch to heat, but shuts off after a few seconds.

 

[Mcontrols]

For the heating function of the seats during cold weather, it may not run immediately after turning to the hot side, it takes some time to warm up then will blow warm air. Similar to the main heating of the car, it needs the engine to be of sufficient heat to start blowing heat through the vents.

Not true Ryus, the heating/cooling in the seats has nothing to do with running the engine. Try it yourself, turn off the cabin a/c and heat, turn on your seat climate control in htg or clg without starting the engine. Seat heating and cooling are independent of the main heat cool unit.

 

[nima]

Not true Ryus, the heating/cooling in the seats has nothing to do with running the engine. Try it yourself, turn off the cabin a/c and heat, turn on your seat climate control in htg or clg without starting the engine. Seat heating and cooling are independent of the main heat cool unit.

I think he meant its "similar" to when you turn the heat on with a cold engine; not that the seat "needs" a running warm engine

 

[Roamer]

Typically, when your cooling function works but the heat faults out, it's an issue with the climate controlled seat (CCS) control unit. It's also sometimes referred to as the CCS module.

At the rear bottom of the seat, it is the box beside the seat blower.
Thankfully, there's one under each seat, so you can just switch the driver and passenger one for troubleshooting purposes.

Would this also be true if both heating and cooling did the same thing? I checked for the typical burnt wire/connector and everything looks good. No matter which speed setting, nor whether I switch to heat or cool, it'll run for a few seconds then turn off.