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

CHECK:

Push the temperature control switch and check that the cool air bypass damper operates with changes in the vent blower output and damper operation noise.

OK:

DETECTION ITEM

Display Code	Max. Cool Damper
0 - 2 3 - 9	Open Shut

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

Check cool air bypass damper control servomotor.
PREPARATION:

Remove cool air bypass damper control servomotor (See COOL AIR BY-PASS DAMPER CONTROL SERVOMOTOR ).

CHECK:

Connect positive (+) lead to terminal 5 and negative (-) lead to terminal 4.

OK:

The lever moves smoothly to SHUT position.

CHECK:

Connect negative (-) lead to terminal 4 and positive (+) lead to terminal 5.

OK:

The lever moves smoothly to OPEN position.

Fig 1: Identifying Cool Air Bypass Damper Control Servomotor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Replace cool air bypass damper control servomotor.
2. OK : Go to next step.
Check harness and connector between A/C ECU and cool air bypass damper control servomotor, cool air bypass damper control servomotor and battery (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG : Repair or replace harness or connector.
2. OK : Check and replace A/C ECU.