Inspection Procedure

WARNING: This page is about a different car, the 2005 Lexus GS 430 and 2005 Lexus GS 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 control assembly connector.
PREPARATION:

Remove A/C control assembly with connectors still connected.

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

Voltage: Battery positive voltage
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 control assembly and body ground.
CHECK:

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

Fig 2: Measuring Resistance GND Terminal Of A/C Control Assembly
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

Resistance: 0 Ω (continuity)
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.

Fig 3: Identifying Radio No. 2 Fuse From Driver Side J/B
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK:

Check continuity of RADIO No. 2 fuse.

OK:

Continuity
1. NG: Check for short in all the harness and components connected to the RADIO No. 2 fuse .
2. OK: Check and repair harness and connector between A/C control assembly and battery.