Inspection Procedure

WARNING: This page is about a different car, the 2004 Toyota 4Runner. 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)

OK: Go To Step 5

NG: Go To Next Step

INSPECT RADIO RECEIVER ASSY (ILL+, GND)

Check voltage.

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

Fig 1: Inspecting Radio Receiver Assy (ILL+, GND)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

STANDARD

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

OK: CHECK AND REPLACE RADIO RECEIVER ASSY

NG: Go To Next Step

INSPECT RADIO RECEIVER ASSY (ILL-, GND)
1. Check continuity.
1. Check that the continuity exists between terminals ILL- and GND of radio receiver assy and body ground.
  
  Fig 2: Inspecting Radio Receiver Assy (ILL-, GND)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Standard: Continuity exists.

OK: CHECK AND REPLACE RADIO RECEIVER ASSY

NG: Go To Next Step
INSPECT LIGHT CONTROL RHEOSTAT (See OPERATING LIGHT CONTROL RHEOSTAT DOES NOT CHANGE LIGHT BRIGHTNESS )
OK: CHECK AND REPLACE RADIO RECEIVER ASSY

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

NG: CHECK AND REPLACE RADIO RECEIVER ASSY

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

NG: THE SETTING IS ABNORMAL

OK: CHECK AND REPLACE NAVIGATION ECU