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 mark display. (To examine whether air conditioner screen is displayed with air conditioner SW.)
1. NG : Go to step 4 .
2. OK : Go to next step.
Display check mode. (Vehicle signal check mode: IG)
1. NG : Replace or repair speed sensor and wire harness (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
2. OK : Go to next step.
Display check mode. (Panel switch check, A/C-related switch check.)
1. NG : Replace multi display (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
2. OK : Check gateway system. (A/C ECU communication circuit) (See GATEWAY SYSTEM - DIAGNOSIS )
Check "AVC-LAN communication circuit" (See AVC-LAN (COMMUNICATION BUS) CIRCUIT ).
CHECK:

Check continuity of the wire harness between the gateway ECU and the radio and player.

OK:

Continuity
1. NG : Replace or repair AVC-LAN circuit (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
2. OK : Check gateway system. (A/C ECU communication circuit)