How to Fix the Touchscreen in a Lexus IS350

by Colin Robertson

There's a flaw on the touchscreen's digitizer that makes it prone to failing. I will show you how pull out and fix it, and hopefully save you a few grand Lexus would otherwise charge you for the fix.

Supplies

  • Flathead screwdriver
  • Multimeter
  • Silver Conductive pen
  • Phillips screwdriver (small)
  • Socket driver
  • Exacto knife
  • Confidence
  • Instructions

    Step 1

    I learned how to do this by following the post by jlangford here: http://us.lexusownersclub.com/forums/index.php?showtopic=69937 Please reference his work for more details and photos.

    Step 2

    This is the unit we're dealing with. The touch screen digitizer is broken and while the screen works, it doesn't register touch.

    Step 3

    You start by pulling the vent unit out. See those tabs?

    Step 4

    Use a flathead screwdriver to flip them down. There's 4.

    Step 5

    Use a screwdriver or flat tool to gently pull the vent unit out.

    Step 6

    The vent unit being pulled out.

    Step 7

    You will have to disconnect two cables. No idea what they do... But no big.

    Step 8

    Again the unit out and the cables clearly shown.

    Step 9

    Here are the first two of the four bolts to remove.

    Step 10

    To get to the bottom set of bolts, use a screwdriver to gently pull these rails off.

    Step 11

    Pretty easy task.

    Step 12

    The bolts are pretty tricky to access; you'll need to have a longer socket driver or use an extension. Take care to not drop the bolt!

    Step 13

    Removing the shifter handle is not necessary, but it's simple to unscrew and gives you a bit more room for when you pull the unit out.

    Step 14

    The whole unit comes out like this. I suggest putting a folded towel down on your center dash to protect it from the heavy unit's frame scratching things up.

    Step 15

    There are a myriad of cables to disconnect. Taking a picture to have a reference of how everything is properly connected is useful, but it's pretty obvious where things go.

    Step 16

    The unit fully pulled out and disconnected.

    Step 17

    The first time I did this I made the mistake of dismantling the whole thing. You only need to remove the frame and pull the screen unit out.

    Step 18

    There are 8 screws holding the frame on. You can see some of them at the bottom of this photo.

    Step 19

    Carefully use a screwdriver to release the several tabs and pull the face off. Disconnect the cable attached to the frame.

    Step 20

    Unscrew the 4-6 screws holding the screen unit in and pull it out. You will also need to remove the frame piece seen here.

    Step 21

    This is the problem! The digitizers connection to the ribbon cable is very fragile. You can see my prior fix in this photo.

    Step 22

    After carefully disconnecting the digitizer cable, you need to test the traces to find out which connection failed, as it's not visible to the eye.

    Step 23

    The resistance between pins 1 and 3, and 2 and 4 should be about 500 and 1700 ohms. If not, then you have found your bad connector.

    Step 24

    After gently scraping the thin layer of insulation away using an exacto knife or something similar, use the silver conductive pen to repair the trace.

    Step 25

    After the silver "ink" dries (the silver ink isn't conductive until it dries), test the connection again and make sure it reads either 500 or 1700 ohms. Reinstall everything and Viola! Working touch!