Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.

DISPLAY CHECK MODE
1. Perform display check.
  1. Set up diagnosis system and read result of display vehicle check mode.
    STANDARD: Input signal is normal (TAIL)
1. OK: Go to step 5 .
2. NG: Go to next step.

INSPECT NAVIGATION RECEIVER ASSY (ILL+)

Check voltage.

Measure voltage between terminals ILL+ and GND of radio receiver assy at each conditions, as shown in the chart.

Standard:

HEADLIGHT DIMMER SWITCH POSITION STANDARD VOLTAGE

Headlight dimmer switch position	condition
OFF	0V
TAIL or HEAD	10-14V

Fig 1: Inspecting Navigation Receiver Assy (ILL+)

OK: CHECK AND REPLACE NAVIGATION RECEIVER ASSY
NG: Go to next step.

INSPECT NAVIGATION RECEIVER ASSY (ILL-)
1. Check continuity.
  1. Check that the continuity exists between terminals ILL- and GND of radio receiver assy and body ground.
    Standard: Continuity exists.
    
    Fig 2: Inspecting Navigation Receiver Assy (ILL-)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: CHECK AND REPLACE NAVIGATION RECEIVER ASSY
2. NG: Go to next step.
INSPECT LIGHT CONTROL RHEOSTAT (See INSPECTION )
1. OK: CHECK AND REPLACE NAVIGATION RECEIVER ASSY
2. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
INSPECT DISPLAY
1. Check the screen display.
  1. Check that the screen dimmed by turning the headlight dimmer switch to ON.
    STANDARD: The screen dimming function is normal
1. NG: CHECK AND REPLACE NAVIGATION RECEIVER ASSY
2. OK: Go to next step.
CHECK SETTING
1. Check the settings.
  1. Turn the ignition switch ON.
  2. Turn the power switch of the radio receiver assy ON to display the map.
  3. Operate the radio receiver assy, and check that "The color of night screen is standard" is set at the navigation condition setting.
    STANDARD: The setting is normal
1. NG: THE SETTING IS ABNORMAL
2. OK: CHECK AND REPLACE NAVIGATION RECEIVER ASSY