Problem Symptoms Table

HINT:

Before performing verification listed in the table below, check the fuse and relay.
Methods used to verify the cause of the problem are listed in order of probability in the verification column.

Display function

PROBLEM SYMPTOMS TABLE - DISPLAY FUNCTION

Symptom	Verification
Pressing PWR switch does not turn on system.	"PRESSING POWER SWITCH DOES NOT TURN ON SYSTEM" Power source circuit (radio and navigation assy) Replace radio and navigation assy
Black screen (No image appears on navigation/audio screen).	"BLACK SCREEN (NO IMAGE APPEARS ON NAVIGATION AND AUDIO SCREEN)" Dimmer signal circuit Power source circuit (radio and navigation assy) Replace radio and navigation assy
Illumination for panel switch does not come on with TAIL switch on.	"ILLUMINATION FOR PANEL SWITCH DOES NOT COME ON WITH TAIL SWITCH ON" Dimmer signal circuit Replace radio and navigation assy
Display does not dim (Night Screen) with TAIL switch on.	"DISPLAY DOES NOT DIM (NIGHT SCREEN) WITH TAIL SWITCH ON" Dimmer signal circuit Replace radio and navigation assy
Power does not turn off (The screen remains on).	Power source circuit (radio and navigation assy) Replace radio and navigation assy
Panel switch does not function.	"PANEL SWITCH DOES NOT FUNCTION" Power source circuit (radio and navigation assy) Steering pad switch circuit Replace radio and navigation assy
Touch panel switch does not function.	"TOUCH PANEL SWITCH DOES NOT FUNCTION" Power source circuit (radio and navigation assy) Steering pad switch circuit Replace radio and navigation assy
Display panel does not open, tilt, or tilts improperly.	"DISPLAY PANEL DOES NOT OPEN, TILT, OR TILTS IMPROPERLY" Power source circuit (radio and navigation assy) Replace radio and navigation assy
Screen is distorted.	Power source circuit (radio and navigation assy) Replace radio and navigation assy
Screen flicker or color distortion.	"SCREEN FLICKER OR COLOR DISTORTION" Power source circuit (radio and navigation assy) Replace radio and navigation assy

Audio function

Fig 1: Problem Symptom Table - Audio Function

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Navigation function

Fig 2: Problem Symptom Table - Navigation Function

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disc player changer function

Fig 3: Problem Symptom Table - Disc Player Changer Function

Steering pad switch function

Fig 4: Problem Symptom Table - Steering Pad Switch Function