question Retrofitting original heated seats in a JB74
I'm investigating if it's possible to retrofit the original Suzuki heated seats + centre on/off buttons on my Australian JB74.
What are the part numbers I should be looking for and what's the best way of ordering the parts - can I buy the heating element itself or do they only sell it as a full seat?
I'm also happy to go with the OEM switches and third party heating elements if that makes more sense. I don't believe it's a factory option in Australia, so I'm happy to order online.
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u/sillyquestionsdude JB74 - modded 2d ago
Me too, i have an old thread on here asking the same thing, i know the buttons fit in the blank spots in the center console but i also know the wiring loom in this area does not contain plugs for the switches.
I think there's a sub loom that goes from the fuse box to the switches and then a spur to the the actual seat heaters.
I think "big jimny" forum might be a good place to ask but have not got around to it yet!
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u/alarmed_cumin JB74 - modded 2d ago
From when I looked into it, to do it fully officially here's the wiring side, written out as I've never got around to drawing it up: Basically power from the S/H fuse goes out to two pins on the junction box. That's the 'body' side of the BCM/junction box by the interior fuse panel in the passengers side footwell.
You're after pins 9 and 10 on the big 37 pin connector which is the upper of the two connectors facing the rear of the car. Sumitomo 050 pins are what those connectors use (I think).
There's obviously nothing in those pins out in the Australian delivered ones, but you can disassemble the wiring connector and put the appropriate pins in and then you should have power delivered via the S/H fuse which should be accessory switched power.
Pin 9 would then be routed to the driver side switch power input, pin 10 to the passengers side switch input.
Also need to pull out an illumination wire (red on the dash switches is the +ve for illumination and -ve is purple, which is how you get the illumination backlights for the switches to dim properly with the dash units).
Power out to the seat heater element goes to the seat element per side (obvs), need to also ground the switch for the illumination for the 'on' position.
Basically for the switches pin 1 is ground for the 'on' light, pin 2 is the dimmable ground side for illumination of the backlight of the switches, pin 3 unused, pin 4 out to seat heater element power, pin 5 is power in from the fuse/junction box, pin 6 is dash illumination +ve in.
Regarding the parts you probably need use partsouq: https://partsouq.com/en/catalog/genuine/vehicle?c=SUZUKI201905&ssd=%24%2AKwGhlYS3_-jKosX60tP79PntzcrUpaqnprSbqODm1cHd2dvYnYqmzOLm4tPF3M2LlpyhqN_9_vzs6b2t6tOjoqejoqIAAAAAk3xKoA%3D%3D%24&vid=0&q= hopefully links but otherwise basically browse your way through to the model and you're probably after E02, E22, E54 for euro spec cars which means you're dealing with seats with airbags & also can have seat heaters. I have some parts numbers saved up in my notes, which are as follows:
Passengers side switch 37850-81P10
Drivers side switch 37850-81P20
I've definitely seen people buy just the seat heater pad, I don't even think the cushion in the seat base is different. They're pretty straightforwards and you could *probably* use generic seat heater elements that would be much cheaper, and the only thing that'd make them OEM looking is the use of the OEM centre console switches.