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.

Actuator check.

PREPARATION:

Set to the actuator check mode (See PRE-CHECK ).
Press the UP switch and change to step operation.

CHECK:

Press the UP switch in order and check the condition of air flow mode.

OK:

The mode changes with the change in the temperature display, as shown in the table.

DISPLAY CODE AIR FLOW MODE

Display Code	Air Flow Mode
0 - 3	FACE
4 - 5	BI-LEVEL
6 - 7	FOOT
8	FOOT/DEF
9	DEF

OK : Proceed to next circuit inspection shown on problem symptoms table (See PROBLEM SYMPTOMS TABLE ).
NG : Go to next step.

Check air vent mode damper control step motor.
PREPARATION:

Remove air vent mode damper control step motor (See COOL AIR BY-PASS DAMPER CONTROL SERVOMOTOR ).

CHECK:

Measure resistance between terminals 3 and other terminals.

OK:

Resistance

Fig 1: Removing Air Vent Mode Damper Control Step Motor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Terminal Specification
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Replace air vent mode control step motor.
2. OK : Go to next step.
Check harness and connector between A/C ECU and A/V mode damper control step motor, A/V mode damper control step motor and battery, A/V mode damper control step motor and body ground (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG : Repair or replace harness or connector.
2. OK : Repair or replace A/C ECU.