Hi, my 2005 LS430 with 171000 miles,
Nav’s screen is just now showing
“External System Is Not Connected”.

I checked all connections at trunk’s
DENSO computer module. They are
secure.
1. Are there any other connections
to be checked? I have not touched
the screen, etc. Don’t plan on doing
this.
2. I have learned from threads that this module’s soldered joints can go bad
with age. Which joints are they?
3. Can’t find anyone who is knowledgeable
​​​​​​ who wants to repair the module, etc.
4. Can any Forum members provide a
repair facility?
5. Are there any fuses, etc. that I should
be checking? If so, what’s their locations?
6. If none of this is successful, I will have
to locate a unit from a dismantler.
7. Any other ideas? Referrals?
8. Module is labeled Denso #86841-50090.
What other Lexus models OR other car
manufacturer’s models utilize
this same module?
Thanks. PAULANTH

 

I don't know that this thread is related to your issue or not but I just inform you. The OP took apart the head unit and found out a blown fuse.

"04' Lexus LS430 HELP !!! - External system is not connected"

https://www.clublexus.com/forums/ls-...connected.html

 

Thanks Yamae for your response.
I have two questions for the Forum:
1. What is the “OP” in Yamae’s second line?
2. Does anyone have a tutorial
​​​​​​ of how to remove trim and get
to the fuse in the Head Unit?
The location of the fuse & type fuse?
(the Head Unit being the screen
in the front center instrument
​​​​​​ panel - correct?).

My journey continues.

 

Original Poster.