Driver’s seat problem

[DrJBdriver]

2 months ago my driver’s seat stopped working on my 2013 LC200. There is no movement in any direction. The recline also stopped working. I have changed out the switch on the left side and the fuses are fine. If power is applied directly to the motors they work. Any ideas?

 

[Malleus]

Hmmm...service manual and EWD?

 

[Simplespirit]

There are 3 junction blocks in the driver's side kick panel. IIRC it goes through on of those and I have read numerous posts about corrosion due to windshield leaks or sunroof drain leaks, etc. I had a couple of issues there with no continuity on the wire to the driver's door courtesy switch and a broken pin for a rear a/c servo. I repaired both myself bypassing those blocks, but it's a do at your own risk kind of thing and access is tight.

 

[mogger]

2 months ago my driver’s seat stopped working on my 2013 LC200. There is no movement in any direction. The recline also stopped working. I have changed out the switch on the left side and the fuses are fine. If power is applied directly to the motors they work. Any ideas?

Have a solution for this yet? In the same boat.

 

[570aus]

As mentioned above
Take the kick panel off
3 big junction wiring blocks
Unbolt them apart and best to pull the whole housing out too to get to the rear half of those wiring blocks. Youll need to unbolt the plastic casing housing those connectors with 1x bolt, from inner fender and unclip it as well (i had to use a large flat blade screw driver to bend down on plastic tabs and do whatever i could to release it away from the fender). Also remove the scuff plate and unclip the main loom from the channel underneath the scuff plate (large blue wiring clips holding the loom in) to give the whole thing room to maneuver around to get to the rear of it.

Youll find corroded connectors and likely broken pins and broken wires (big blue one probably).

Need to make jump wires from side to side if broken off, otherwise clean up corroded pins inside those connectors with deox.

Had a broken wire for the main seat power on one i fixed last week

 

[570aus]

Photo as example from another page

https://tnstatic.net/attachments/img_5868-jpg.1058975/

The very bottom left large pin/s.

The one I had fixed : very bottom left of this connector, two largest male pins were snapped off. From the rear of the connector, the two wires which led to these pins were broken off and loose.

One of the two was a fatter gauge blue wire. In the diagram this controlled power to the front left seat. There was also a broken green wire but cant remember what it controlled, but of course I fixed it.

Had to join that broken off wire, to a good section of wire on the front side connector as a 'link' wire (along with any other broken wires i found, total of 4). Also cleaned up the corrosion using deox and a little paint brush. Immediately restored power to the seat.

Make sure you very carefully check for broken pins, because some of the smaller pins can break off pretty flush and you cant tell sometimes. Focus specifically on the female connector for this. They have 'holes' for the male pins to go into, make sure none of them are blocked with a broken pin inside - all female pin holes should be empty

In our case, blocked sunroof drains caused overflow of water to channel down the pillars and bring corrosion over time to that bottom connector block.

Check all three though. The top of the 3 block connectors also had a snapped pin on a blue wire at pin 35 (radio wire)

 

[mogger]

Photo as example from another page

https://tnstatic.net/attachments/img_5868-jpg.1058975/

The very bottom left large pin/s.

The one I had fixed : very bottom left of this connector, two largest male pins were snapped off. From the rear of the connector, the two wires which led to these pins were broken off and loose.

One of the two was a fatter gauge blue wire. In the diagram this controlled power to the front left seat. There was also a broken green wire but cant remember what it controlled, but of course I fixed it.

Had to join that broken off wire, to a good section of wire on the front side connector as a 'link' wire (along with any other broken wires i found, total of 4). Also cleaned up the corrosion using deox and a little paint brush. Immediately restored power to the seat.

Make sure you very carefully check for broken pins, because some of the smaller pins can break off pretty flush and you cant tell sometimes. Focus specifically on the female connector for this. They have 'holes' for the male pins to go into, make sure none of them are blocked with a broken pin inside - all female pin holes should be empty

In our case, blocked sunroof drains caused overflow of water to channel down the pillars and bring corrosion over time to that bottom connector block.

Check all three though. The top of the 3 block connectors also had a snapped pin on a blue wire at pin 35 (radio wire)

Thanks for the info! Extremely helpful.

I was able to access behind the kick panel and get into the 3 blocks (btw, any idea what they are officially called?). Top 2 were perfect, with dialectic grease still intact. Bottom one was showing corrosion worse than what you shared.

Tried cleaning it with white vinegar and got if fairly clean. But no change. Still no motion.

For the record we swapped DS and PS seats and both work while plugged into PS, and neither work on DS. We also deduced that the male portion of the block receives power from the battery and the female portion of the block is what delivers power to the seat.

We tried jumping a wire from the big blue wire directly into the seat plug blue wire, and it worked once on PS, but never on the DS. No amount of getting power directly into the seat seemed to have any affect.

Did you end up wiring directly from the male block into the seat?

Thanks again for your help!

 

[570aus]

Thanks for the info! Extremely helpful.

I was able to access behind the kick panel and get into the 3 blocks (btw, any idea what they are officially called?). Top 2 were perfect, with dialectic grease still intact. Bottom one was showing corrosion worse than what you shared.

Tried cleaning it with white vinegar and got if fairly clean. But no change. Still no motion.

For the record we swapped DS and PS seats and both work while plugged into PS, and neither work on DS. We also deduced that the male portion of the block receives power from the battery and the female portion of the block is what delivers power to the seat.

We tried jumping a wire from the big blue wire directly into the seat plug blue wire, and it worked once on PS, but never on the DS. No amount of getting power directly into the seat seemed to have any affect.

Did you end up wiring directly from the male block into the seat?

Thanks again for your help!

Hi.
On the problematic side - when you said you saw corrosion, i assume that was between the connectors when you pulled them apart right?

So what about behind the big block connector itself (i.e. you need to remove it from where its attached to the sill/pillar area altogether and get behind it where the wiring enters into the block connector from behind) ? Thats where the power wire to the seat was broken out of the rear of the block connector itself.

If youve looked behind that bulkhead and the wiring hasn't corroded/broken apart on the rear side (that without removing it , you wont be able to know for sure) then the only other test i can suggest is test light on the pin which the fat blue wire is feeding to see if its getting power