Inspection Procedure

WARNING: This page is about a different car, the 2003 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)
1. OK: Go to step 5
2. NG: Go To Next Step

Inspect Radio Receiver Assembly (ILL+, GND)

Check voltage.

Measure voltage between terminals ILL+ and GND of radio receiver assembly at each conditions, as shown in RADIO RECEIVER ASSEMBLY (ILL+, GND) VOLTAGE table.

Standard:

RADIO RECEIVER ASSEMBLY (ILL+, GND) VOLTAGE

Headlight Dimmer Switch Position	Condition
OFF	0V
TAIL or HEAD	10 - 14V

Fig 1: Inspecting Radio Receiver Assembly (ILL+, GND)

OK: Check And Replace Radio Receiver Assembly
NG: Go To Next Step

Inspect Radio Receiver Assembly (ILL-, GND)
1. Check continuity.
  1. Check that the continuity exists between terminals ILL- and GND of radio receiver assembly and body ground.
    
    Fig 2: Identifying Radio Receiver Assembly Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  Standard: Continuity exists.
1. OK: Check And Replace Radio Receiver Assembly
2. NG: Go To Next Step
Inspect Light Control Rheostat See INSTRUMENT PANEL/METER
1. OK: Check And Replace Radio Receiver Assembly
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 Radio Receiver Assembly
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 assembly ON to display the map.
  3. Operate the radio receiver assembly, 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 ECU