Question about Lexus LS 400

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Why will my 1998 Lexus LS400 LS 400 not communicate with OBD II scan tool

I took it to a Lexus dealer and they could not get their scanner to read any information. No codes, nothing.... Car runs great but has some bad electrical issues..

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  • mike S Jan 16, 2013

    If you know anything about this issue PLEASE contact me. Thank you..

  • mike S Jan 18, 2013

    My 1999 Lexus ls400 has several things going crazy. The horn stays on the lights flash the door locks dont work, headlights stay on.

  • mike S Jan 18, 2013

    I took it to Lexus dealer and 2 other shops to see if there are any computer trouble codes.. Thier scanners will not communicate with the car.

  • mike S Jan 18, 2013

    Can you help me figure out why not? I have ground at 12 v at OBD II connector under dash. Car runs fine and drives fine.



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Posted on Jan 02, 2017

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SOURCE: radio locked 1991 lexus ls400

do you know how to reset radio code lexus ls 400 /1991

Posted on Oct 30, 2009

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SOURCE: check engine light for a 1995 pontiac sunfire


Posted on Mar 12, 2010

SOURCE: 2007 chevrolet suburban check engine light came on

The OBDII connector is on the same circuit as the cigarette lighter. A lot of times a cell phone charger or other device will blow the fuse and cause the scanner not to power on or communicate. I would just double check the cigarette lighter fuse. Also, maybe try a different place. Pep Boys isn't exactly known for hiring the most qualified technicians.
As or the remote start. It isn't working because of the check engine light. For some reason on late model GM vehicles, having the check engine light on disables the remote start system. Once the problem is repaired and the codes cleared the remote start will work again.

Posted on Jul 17, 2010

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  • 197 Answers

SOURCE: codes:p1346/p1349/p1354/p0446/p0300/p0301/p0303/p0305/p0307/ p0430/car runs rough

P0301 Cylinder No. 1 Misfire Detected
P0302 Cylinder No. 2 Misfire Detected
P0303 Cylinder No. 3 Misfire Detected
P0304 Cylinder No. 4 Misfire Detected
P0305 Cylinder No. 5 Misfire Detected
P0306 Cylinder No. 6 Misfire Detected
P1346 Variable Valve Timing (VVT) Circuit Range/Performance Fault
P1349 Variable Valve Timing (VVT) System Malfunction
P0330 Knock Sensor
P0446 EVAP Vent Control Fault
P0430 Catalyst System

Stop driving immediately.....

You defiantly skipped on your timing........

Posted on Feb 15, 2011

  • 106 Answers

SOURCE: Another problem with my intrepid is that the obd

Most of the time a no buss comunication problem is due to a short to ground or a short to power on the buss wiring. The buss wiring is a pair of wires that connect all of the modules in the vehicle togather so they can all comunicate, kind of like a telephone wire set that allows calls from one module to the next. If you short it, then the electrical signal can't get to the destination module (no buss).

The voltage should be about 2.5 volts. The voltage is usually created by one or more of the modules, so if one module fails but doesn't short to power or ground the other modules can still communicate with the scanner and tell the tech where the problems lies.

If it is 0 it is shorted to ground (this means the wire has shaffed and touched bare (ground) metal somewhere, or a module has malfunctioned internally and grounded the curcuit), if it has 12 volts, then it is shorted to power and this is usually a bad module.

The best way to test is to actually unplug modules one at a time untill the buss comes to life again. Then you know which module it is. If it not a module then it is a bigger diag job.

Just as a side note, most of the time we run into this type of problem it is usually the radio or the heater control head. To test these simply unplug them one at a time and see if the scanner now reads the buss. It can be other things but this is usually what we see.

Good luck!

Posted on Apr 25, 2011

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