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 terminals ACC and GND of A/C ECU connector.
PREPARATION:

Remove A/C ECU with connectors still connected.

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

Voltage : Battery positive voltage

Fig 1: Identifying Terminals ACC And Gnd Of A/C ECU Connector
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 P-ACC fuse.
PREPARATION:

Remove P-ACC fuse from passenger side J/B.

CHECK:

Check continuity of P-ACC fuse.

OK:

Continuity exists.

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