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 it to step operation.

CHECK:

Press the UP switch in order and check the operation of water valve.

OK:

The condition of the water valve changes with the change in the temperature display, as shown in the table.

VOLTAGE CONDITION SPECIFICATION

Display Code	Water Valve
0 - 2	SHUT
3 - 9	OPEN

Fig 1: Checking Actuator

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

Check water valve control servomotor.
PREPARATION:

Remove water valve control servomotor (See WATER VALVE CONTROL SERVOMOTOR ).

CHECK:

Connect positive (+) lead to terminal 1 and negative (-) lead to terminal 3.

OK:

The lever moves smoothly to OPEN position.

CHECK:

Connect negative (-) lead to terminal 1 and positive (+) lead to terminal 2.

OK:

The lever moves smoothly to SHUT position.

Fig 2: Identifying Water Valve Control Servomotor
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1. NG : Replace water valve control servomotor assembly.
2. OK : Go to next step.
Check harness and connector between A/C ECU and water valve control servomotor (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.