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.

CHECK SETTING (THE VOLUME OF THE NAVIGATION SOUND)
1. Check the settings
1. Set the volume MAX at the voice sound settings on the menu.
STANDARD: Vocalize "This system will guide you in the volume"

HINT:
- In the following cases, no voice sound guidance is made even if the system is normal.
- When the destination is not set.
- When not running on the route (the remaining distance at the left bottom on the present point is not displayed)
- When "other modes guidance" is not set (noise sound guidance is made only on the map screen)
OK: NORMAL (RECHECK THE OPERATION)

NG: Go To Next Step
INSPECT NAVIGATION ECU (AUO+/-, GND)
1. Check signal waveform.
1. Using an oscilloscope, check signal waveform between terminals AUO+, AUO- and GND of navigation ECU.
Fig 1: Inspecting Navigation ECU (AUO+/-, GND)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: STANDARD
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: CHECK AND REPLACE NAVIGATION ECU

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR
INSPECT FRONT NO.1 SPEAKER ASSY
1. Check continuity.
1. Check that the continuity exists between terminals of front No.1 speaker.
Standard: 2 - 8Ω

NG: REPLACE FRONT NO.1 SPEAKER ASSY

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR