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 HEATER fuse.
PREPARATION:

Remove HEATER fuse from fusible link block.

CHECK:

Check continuity exists of HEATER fuse

OK:

Continuity exists.

Fig 1: Identifying Heater Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Replace HEATER fuse.
2. OK : Go to next step.
Check harness and connector between battery and blower motor, blower motor and body ground (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG : Repair or replace harness or connector.
2. OK : Go to next step.
Check harness and connector between blower motor and A/C ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG : Repair or replace harness or connector.
2. OK : Go to next step.
Check A/C ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG : Replace A/C ECU.
2. OK : Replace blower motor.