Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus GS 430 and 2003 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

Check "Service check mode" of audio system. (AVC-LAN diagnosis check) (See PRE-CHECK )
CHECK:

Connection of the gateway ECU can be checked by AVC-LAN diagnosis. ("Service check mode" of audio system)

OK:

Display

G/W: OK (System is normal)

G/W: NG (Communication error)

G/W: None (Never registered)
1. NG : Replace the gateway ECU.
2. OK : Go to next step
Check wire harness.
PREPARATION:

Disconnect connector "G6" of gateway ECU and "M4" of multi display.

CHECK:
1. Check continuity between terminals GTX+ of gateway ECU and TX3+ of multi display.
2. Check continuity between terminals GTX- of gateway ECU and TX3- of multi display.
OK:

There is a continuity in wire harness of both (a) and (b), or either (a) or (b).

HINT:

If there is OPEN in wire harness of either (a) or (b), please repair it.

Fig 1: Checking Continuity Between Terminals GTX Of Gateway ECU And TX3 Of Multi Display
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1. NG : Repair or replace wire harness.
2. OK : Replace the gateway ECU.