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 stereo component amplifier.
PREPARATION:

Disconnect the stereo component amplifier connector.

CHECK:

Check the voltage of terminals +B.

OK:

+B: 10 - 14 V

CHECK:

Check voltage of terminal ACC when the ignition switch is in ACC or ON position.

OK:

ACC: 10 - 14 V

CHECK:

Check continuity at terminal GND.

OK:

GND: Continuity
1. NG : Replace or repair wire harness or connector (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
2. OK : Go to next step.
Service check mode. (Stereo component amplifier) (See PRE-CHECK )
1. CHECK: Go to step 4 .
2. OK : Go to next step.
Check stereo component amplifier.
CHECK:

Check the voltage of terminals MUTE, N-MUTE and TMUT.

OK:

MUTE, N-MUTE, TMUT: See "Stereo component amplifier" of "TERMINAL OF ECU"
1. NG : Replace or repair wire harness or connector (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
2. OK : Replace stereo component amplifier (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
Check "AVC-LAN communication circuit" (See AVC-LAN (COMMUNICATION BUS) CIRCUIT ).
CHECK:

Check continuity of the wire harness between the stereo component amplifier 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 : Replace stereo component amplifier (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).