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.

Service check mode (Audio and rear A/C control switch) (See PRE-CHECK ).
1. OK : Replace the audio and rear A/C control switch.
2. NCON: Go to next step.
Check "AVC-LAN communication circuit" (See AVC-LAN (COMMUNICATION BUS) CIRCUIT ).
CHECK:

Check continuity of the wire harness between the rear A/C amplifier and the audio and rear A/C control switch.

OK:

Continuity
1. NG : Replace or repair AVC-LAN circuit.
2. OK : Replace audio and rear A/C control switch.