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Problem Symptoms Table

WARNING: This page is about a different car, the 2004 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Inspect the input output voltage of the terminals which are described in the column of terminal in the table inspect other terminals which are not described referring to "Terminal of ECU"

PROBLEM SYMPTOMS TABLE - LEXUS NAVIGATION SYSTEM

Symptom Suspect Area
The screen is dark, nothing shines on the screen.
  1. Multi display
  2. Wire harness and connector
Nothing appears on the screen. (Back light lights up.)
  1. Multi display

    (Terminal R, G, B)

  2. Navigation ECU

    (Connector C terminal ACC, +B Connector B terminal R, G, B)

  3. Wire harness and connector
The screen is white.
  1. Multi display

    (Terminal R, G, B)

  2. Navigation ECU

    (Connector B terminal R, G, B)

  3. Wire harness and connector
The screen is in disorder. (Synchronizing disorderly.)
  1. Multi display

    (Terminal SYNC)

  2. Navigation ECU

    (Connector B terminal SYNC)

  3. Wire harness and connector
The color on the screen is unusual.
  1. Multi display

    (Terminal R, G, B)

  2. Navigation ECU

    (Connector B terminal R, G, B)

  3. Wire harness and connector
Remote commander switch does not work.
  1. Remote commander
  2. Cradle
  3. Display ECU
  4. Wire harness
GPS mark does not appear at any time and at any place.
  1. Navigation ECU

    (Diagnosis check)

  2. Wire harness and connector
A cursor on present site does not move.
  1. Navigation ECU

    (SPD signal is checked on the "CAR SIGNAL INFORMATION" during diagnosis check.)

  2. Wire harness and connector
Movement of cursor on present site is always unusual. Navigation ECU
Even though the battery has not been removed, the route and destination are not displayed.
  1. Navigation ECU

    (Connector C terminal "+B")

  2. Wire harness and connector
Navigation voice can not be heard at all from the driver's side speaker. Navigation ECU (Volume adjustment)
No sound except the navigation voice can be heard at all from the driver's side speaker.
  1. Navigation ECU

    (Connector "C" terminal "AUI+", "AUI-", "AUO+", "AUO-")

  2. Wire harness and connector
No sound can be heard at all from the driver's side speaker.
  1. Driver's side speaker
  2. Wire harness and connector
No map is Multi displayed on the screen. Navigation ECU (Diagnosis check)
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