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 voltage between terminal +B of A/C ECU connector and body ground.
PREPARATION:

Remove the A/C ECU with connectors still connected.

CHECK:

Measure voltage between terminal +B of A/C ECU connector and body ground.

OK:

Voltage: Battery voltage

Fig 1: Identifying Terminal +B Of A/C ECU Connector And Body Ground
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 A/C fuse.
PREPARATION:

Remove A/C fuse from driver side J/B.

CHECK:

Check continuity of A/C fuse.

OK:

Continuity exists

Fig 2: Checking A/C Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Check for short in all the harness and components connected to the A/C fuse (See WIRING DIAGRAM ).
2. OK : Check and repair harness and connector between A/C ECU and battery.