Inspection Procedure

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

Check "Service check mode" of AVC-LAN diagnosis system.
CHECK:

Connection of the gateway ECU can be checked by AVC-LAN diagnosis.

(w/o LEXUS navigation system: "Service check mode" of audio system)(See PRE-CHECK )

(w/ LEXUS navigation system: "Service check mode" of LEXUS navigation system)(See PRE-CHECK )

OK:

Radio display or Multi display:

G/W: OK (System is normal)

G/W: EXCH (Replace gateway ECU)

others: Troubleshoot for each diagnosis.
1. EXCH: Replace gateway ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
2. Other: Troubleshoot for each diagnosis.
3. OK : Go to next step.

Check wire harness.

PREPARATION:

Pull out the ECU connectors mentioned below.

DTC DETECTION ITEM

Wire harness side connector of ECU	Terminal
Gateway ECU - Radio and player	GTX+ (G3-9) - TXS+ (R3-3) GTX- (G3-20) - TXS- (R3-6)

CHECK:

Check continuity of the wire harness between the connectors.

OK:

Continuity

NG : Repair or replace wire harness.
OK : Replace gateway ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).