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 PS+B of A/C ECU connector.
PREPARATION:

Remove A/C ECU with connectors still connected.

CHECK:
1. Turn ignition switch to ON.
2. Set mode selector to FACE or B/L.
3. Measure voltage between terminals PS+B of A/C ECU when SWING switch is pressed.
OK:

Voltage : Battery positive voltage

Fig 1: Identifying Terminals Ps+B Of A/C ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK : Go to step 3 .
2. NG : Go to next step.
Check intelligent swing resister step motor.
PREPARATION:

Remove intelligent swing register.

CHECK:

Measure resistance between terminals 9 and other terminals.

OK:

Fig 2: Identifying Intelligent Swing Resister Step Motor Terminal Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: Terminal Specification
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Replace intelligent swing register.
2. OK : Go to next step.
Check harness and connector between intelligent swing register and A/C ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG : Check and replace harness and connector.
2. OK : Check and replace A/C ECU.