Inspection Procedure

1. Set the actuator check mode (see PROBLEM SYMPTOMS TABLE ).
2. Press the blower switch to change to the step operation.
3. Check the air flow level by hand.
   DISPLAY CODE/BLOWER LEVEL
   
   

   Display Code	Blower level
   0	0
   1	1
   2	14
   3	14
   4	14
   5	14
   6	14
   7	14
   8	14
   9	31

   OK: 

   Blower level changes in accordance with each display code. 

1. NG: Go to step   2 
2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE  TERMINALS OF ECU  ) 

1. Measure the resistance according to the value(s) in BLOWER MOTOR CONTROLLER - A/C AMPLIFIER RESISTANCE  .

   Standard: 

   BLOWER MOTOR CONTROLLER - A/C AMPLIFIER RESISTANCE
   
   

   Tester connection	Condition	Specified condition
   A11-31 (BLW) - B4-2 (S1)	Always	Below 1 Ω
   A11-31 (BLW) - Body ground	Always	10 kΩ or higher

   Fig 1: Checking Harness & Connector (Blower Motor Controller - A/C Amplifier)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
2. OK: Go to Next Step. 

1. Measure the resistance according to the value(s) in BLOWER MOTOR CONTROLLER - BODY GROUND RESISTANCE  .

   Standard: 

   BLOWER MOTOR CONTROLLER - BODY GROUND RESISTANCE
   
   

   Tester connection	Condition	Specified condition
   B4-1 (GND) - Body ground	Always	Below 1 Ω

   Fig 2: Identifying Terminals Of Blower Motor Controller Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
2. OK: Go to Next Step. 

1. Remove the blower w/ fan motor sub-assy.
2. Connect positive (+) lead to terminal 2 of the blower motor connector and negative (-) lead to terminal 1.

   Standard: Blower motor operates smoothly. 

Fig 3: Inspecting Blower W/Fan Motor Sub-Assy

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPLACE BLOWER W/FAN MOTOR SUB-ASSY 
2. OK: Go to Next Step. 

1. Measure the resistance according to the value(s) in INSTRUMENT PANEL WIRE NO. 3 CONNECTOR TERMINAL RESISTANCE  .

   Standard: 

   INSTRUMENT PANEL WIRE NO. 3 CONNECTOR TERMINAL RESISTANCE
   
   

   Tester connection	Condition	Specified condition
   II1-1 - B4-1	Always	Below 1 Ω
   II1-3 - B3-1	Always	Below 1 Ω

   Fig 4: Identifying Terminals Of Instrument Panel Wire No. 3 Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPAIR OR REPLACE INSTRUMENT PANEL WIRE NO. 3 
2. OK: Go to Next Step. 

1. Measure the resistance according to the value(s) in BLOWER MOTOR CONTROLLER - BLOWER MOTOR RESISTANCE  .

   Standard: 

   BLOWER MOTOR CONTROLLER - BLOWER MOTOR RESISTANCE
   
   

   Tester connection	Condition	Specified condition
   B4-4 (VM) - B3-1	Always	Below 1 Ω
   B4-3 (+B) - Body ground	Always	Below 1 Ω

   Fig 5: Checking Harness & Connector (Blower Motor Controller - Blower Motor)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
2. OK: Go to Next Step. 

1. Remove the A/C amplifier with the connectors still connected.
2. Turn the ignition switch to the ON position.
3. Turn the blower switch on (Lo).
   Fig 6: Inspecting Air Conditioning Amplifier (BLW - Body Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Measure the waveform between terminal BLW (A11-31) of the A/C amplifier and body ground.

   OK: 

   Waveform operate as shown in  Fig 7  . 

   Fig 7: Measuring Waveform Between Terminal BLW (A11-31) Of A/C Amplifier & Body Ground

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

Waveform varies with the blower level.

1. NG: REPLACE AIR CONDITIONING AMPLIFIER (SEE  OVERHAUL  ) 
2. OK: REPLACE BLOWER MOTOR CONTROL