Inspection Procedure

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.

Disconnect the connector of CD auto changer and check if AVC-LAN will be recovered normally.
CHECK:

Check that the display will change by pressing either of the Panel switch or Touch switch on the display.

HINT:

It can be judged that AVC-LAN is recovered if the display is changed.
1. OK: Replace the CD auto changer.
2. NG: Go to Next Step
Disconnect the "S8" (Except MARK LEVINSON), "S16" (MARK LEVINSON made) connector of the stereo component amplifier, check if AVC-LAN will be recovered normally.
CHECK:

Check that the display will change by pressing either of the Panel switch or Touch switch on the display.

HINT:

It can be judged that AVC-LAN is recovered if the display is changed.
1. OK: Repair or replace wire harness or connector between stereo component amplifier and CD auto changer.
2. NG: Go to Next Step
Disconnect the "S7" (Except MARK LEVINSON), "S15" (MARK LEVINSON made) connector of the stereo component amplifier, check if AVC-LAN will be recovered normally.
CHECK:

Check that the display will change by pressing either of the Panel switch or Touch switch on the display.

HINT:

It can be judged that AVC-LAN is recovered if the display is changed.
1. OK: Replace the stereo component amplifier.
2. NG: Go to Next Step
Disconnect the "R3" connector of the radio receiver assembly, check if AVC-LAN will be recovered normally.
CHECK:

Check that the display will change by pressing either of the Panel switch or Touch switch on the display.

HINT:

It can be judged that AVC-LAN is recovered if the display is changed.
1. OK: Repair or replace wire harness or connector between radio receiver assembly and stereo component amplifier.
2. NG: Go to Next Step
Check wire harness and connector between radio receiver assembly and multi display. (See O/D DIRECT CLUTCH SPEED SENSOR )
1. NG: Repair or replace wire harness or connector between radio receiver assembly and multi display.
2. OK: Go to Next Step
Check wire harness and connector between multi display and navigation ECU (See O/D DIRECT CLUTCH SPEED SENSOR )
1. NG: Repair or replace wire harness or connector between multi display and navigation ECU.
2. OK: Go to Next Step
Check wire harness and connector between multi display and gateway ECU. (See O/D DIRECT CLUTCH SPEED SENSOR )
1. NG: Repair or replace wire harness or connector between multi display and gateway ECU.
2. OK: Go to Next Step
Skip multi display and check AVC-LAN.
PREPARATION:
1. Connect all the connectors except "M4" and "M8" of the multi display.
2. Using 2 SSTs (Diagnosis check wire P/N 09893-12040), connect the terminal TX+ of connector "M4" and TX+ of connector "M8", the terminal TX- of connector "M3" and TX- of connector "M6" respectively of multi-display.
CHECK:

Operate audio head unit (CD, Cassette tape, etc.) and check that the sound comes out from the speaker.

(Check that AVC-LAN is recovered.)

Fig 1: View Of Skip Multi Display
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: Replace the Display ECU.
2. NG: Go to Next Step
Skip radio receiver assembly and check AVC-LAN.
PREPARATION:
1. Connect multi display connector.
2. Disconnect radio receiver assembly "R2" connector.
3. Using SST (Navigation Check Wire P/N 09843-18050), connect the terminal TX2+ to terminal TX2- of "R2" connector of radio receiver assembly.
CHECK:

Operate the panel switch and the touch switch of the display and check that the navigation functions.

(Check that AVC-LAN is recovered.)

Fig 2: Identifying Skip Radio Receiver Assembly
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: Replace the radio receiver assembly.
2. NG: Replace the navigation ECU.