Hello Everyone! Need some help!
I completely screwed up. Replaced the rear brakes without setting rear brakes to service mode first. I looked it up and did the procedure once the caliper was off and it ended up pushing the piston out. Long story short, I ended up buying a new caliper set up. Installed everything. Checked that everything was properly connected and bolted on. Now I can’t get rid of the EPB malfunction. What am I missing? I haven’t fully bled all brakes. Could this be the culprit?

 

the system will be working just fine. If you say no to both, you might need to find an alternative deale

 

Hi JP,
You can reset the "Electronic Parking Brake Malfunction" code without the dealer or TechStream. I have a 2017 NX200T. I had the same problem today. I was replacing the rear brakes and put the vehicle in service mode (without TechStream, manual process). I heard the rear caliper electric motors turning but the calipers did not compress.

Service Mode Procedure:

You Tube

- Jump 4 & 12 terminals in OBD port
- Vehicle on ignition,
- Pull EPB 3 times, push down 3 times and then push and hold within 8 seconds

I thought it was stuck and needed assistance so, I removed the rear calipers (with the electric motor) and put the vehicle in service mode thinking it would compress if I assisted turning with my hand. When I started the service mode procedure the opposite happened for some reason. The piston started fully extending. Eventually, the piston came off from the bolt that is held by a T-40 torx screw.

I thought I may have to buy a new caliper but was able to rebuild the caliper by removing the electric motor loosening the 5mm allen screw. Once the electric motor was removed, there is a T-40 torx screw/bolt. I loosened it until the piston was fully unscrewed and pulled the piston out from the rubber boot. Note: the T-40 torx bolt is held by a C-clip and has two washers sandwiched by a needle bearing if this comes out of the caliper. I removed the C-clip but this is not necessary. I then stretched/widened the rubber boot and had an assistant put the piston back in the slot. Once in the slot, I tightened the T-40 torx bolt and pushed the piston by hand (once seated, it fell into the slot). I then used a brake caliper tool to help assist it to go back in/compress while I was tightening the T-40 torx bolt. Once fully tightened, the piston was seated fully. This link may help explain the above procedure .
I installed the new rear brake pads repeating the steps on the other side and bleed the rear brakes like any other vehicle (in ACC mode press the brake pedal ~5 times and hold and have someone loosen the bleeder valve, repeat ~ 3 times). When I started the vehicle, the "Electronic Parking Brake Malfunction" light came on. I searched ClubLexus and found this procedure following imayzguy post. https://www.clublexus.com/forums/gs-...unction-3.html

Electronic Parking Brake Malfunction Reset Procedure:
- Jump 4 & 13 terminals in OBD port
- Turn the ignition ON
- Pull the park switch back (towards me) five times within five seconds

Hope this helps. I will try to make a DIY post.