Inspection Procedure

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

Check voltage between terminals ACC and GND of A/C amplifier connector.
PREPARATION:

Remove A/C amplifier with connectors still connected.

CHECK:
1. Turn ignition switch to ACC.
2. Measure voltage between terminals ACC and GND of A/C amplifier.
OK:

Voltage: Battery positive voltage

Fig 1: Measuring Voltage Between Terminals ACC and GND Of A/C Amplifier
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: Proceed to next circuit inspection shown on problem symptoms table (See PROBLEM SYMPTOMS TABLE ).
2. NG: Go t next step.
Check continuity between terminal GND of A/C amplifier and body ground.
CHECK:

Measure resistance between terminal GND of A/C amplifier and body ground.

OK:

Resistance: 0 Ω (continuity)

Fig 2: Measuring Resistance Between Terminal GND Of A/C Amplifier And Body Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Repair or replace harness or connector.
2. OK: Go to next step.
Check RADIO No.2 fuse.
PREPARATION:

Remove RADIO No.2 fuse from driver side J/B.

CHECK:

Check continuity of RADIO No.2.

OK:

Continuity

Fig 3: Checking Radio No.2 Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Check for short in all the harness and components connected to the RADIO No.2 fuse (See attached wiring diagram).
2. OK: Check and repair harness and connector between A/C amplifier and battery.