WARNING: This page is about a different car, the 2004 Lexus GS 430 and 2004 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

PROBLEM SYMPTOMS TABLE - NAVIGATION SYSTEM

Flow chart No.	Component	Symptom
1.	Multi display	Black screen (Nothing displayed)
2.		No sound with Power switch pressed. ("AUTO OFF" on audio screen)
3.		No navigation screen displayed when "MAP", "MENU" or "DEST" switch pressed. (Screen cannot be switched.)
4.		No corresponding screen displayed when "AUDIO" or "Information" switch pressed.
5.		No navigation displayed, "Audio OFF" on audio screen and no audio sound.
6.		Screen cannot be dimmed in night time.
7.		Navigation screen not stabilized. (Synchronous error)
8.		Color on navigation screen is unusual (RGB signal error)
9.		Black screen appears when "MAP", "Menu" or "DEST" switch pressed.
10.		Sound of radio, cassette tape or CD only cannot be heard from speaker.
11.		No sound (radio, cassette tape, CD) can be heard from driver side door speaker only.
12.		Map DISC cannot be inserted.
13.		MAP screen display does not appear. (Disc Caution screen does not change.)
14.		MAP is displayed in white or blue screen. (Switch and vehicle position mark is displayed.)
15.		Touch switch does not function. (Navigation screen only)
16.		Touch switch does not function. (A/C control screen only)
17.		Panel switch does not function. (Navigation screen only)
18.		Panel switch does not function. (A/C control screen only)
19.		The screen cannot be change to night mode color.
20.		Vehicle position is deviated from correct point badly.
21.		GPS mark does not appear.
22.		No voice navigation.
23.		Vehicle position rotates without control. (Map rotates without control)
24.		Driving direction is opposite to moving direction of vehicle position mark.
25.	Audio Head Unit	Radio reception poor.
26.		Cassette tape cannot be inserted.
27.		Cassette tape cannot be ejected.
28.		Any speaker does not work.
29.	CD AUTO Changer	CD magazine cannot be inserted.
30.		CD magazine inserted, but no power.
31.		Power coming in, but CD auto changer not operating.
32.		Sound jumps.
33.		Sound quality poor. (Volume faint)
34.		CD magazine will not be ejected.
35.		Any speaker does not work.
36.	Power Amplifier	No power coming in.
37.		Any speaker does not work.
38.		No power coming, but woofer amplifier not operating.
39.	Noise	Noise occurs
40.		Noise produced by vibration or shock while driving.
41.		Noise produced when engine starts.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Problem Symptoms Table

Use the Manual With the Right Hardware

When to See a Mechanic

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