Inspection Procedure

WARNING: This page is about a different car, the 2005 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

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

Remove A/C amplifier with connectors still connected.

CHECK:
1. Turn ignition switch to ON.
2. Measure voltage between terminals IG and GND of A/C amplifier.
OK:
1. Voltage : Battery positive voltage
Fig 1: Checking Voltage Between Terminals IG 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 to 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:
1. Resistance: 0 Ω (continuity)
Fig 2: Checking Continuity 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 A/C fuse.
PREPARATION:

Remove A/C fuse from cowl side J/B LH.

CHECK:

Check continuity of A/C fuse.

OK:
1. Continuity
Fig 3: Identifying A/C Fuse Location In Cowl Side J/B LH
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Check for short in all the harness and components connected to the IGN fuse (See SYSTEM WIRING DIAGRAMS ).
2. OK: Check and repair harness and connector between A/C amplifier and battery.