Sienna Ac Low Pressure 2000

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

Fig. 100: Duty Ratio & Blower Motor Speed Signals Graph Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

WIRING DIAGRAM

Diagram Connect Air Cool Camry
Fig. 101: Wiring Diagram - Blower Motor Circuit (Front A/C) Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE 1. Check blower motor. PREPARATION:

Remove blower motor (See DISASSEMBLY ). CHECK:

Connect positive (+) lead connected to terminal 2 of blower motor connector, negative (-) lead to terminal 1.

Blower motor operates smoothly.

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

Toyota Rav4 Blower Motor Diagram

G02922249

Fig. 102: Checking Smoothly Operation Of Blower Motor Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: Replace blower motor.

OK: Go to next step.

2. Check harness and connector between battery and blower motor linear controller, blower motor linear controller and body ground (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).

NG: Repair or replace harness or connector.

OK: Go to next step.

3. Check harness and connector between integration control and panel and blower motor linear controller (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).

NG: Repair or replace harness or connector.

OK: Go to next step.

4. Check integration control and panel (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).

NG: Replace integration control and panel.

OK: Replace blower motor linear controller.

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

BLOWER MOTOR CIRCUIT (REAR A/C) CIRCUIT DESCRIPTION

This is the power source for blower motor. WIRING DIAGRAM

4agze Air Condition Wiring Diagram
Fig. 103: Wiring Diagram - Blower Motor Circuit (Rear A/C) Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. Check voltage between terminal BLWC of integration control and panel and body ground.

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

PREPARATION:

Remove the integration control and panel with connector still connected. CHECK:

a. Turn ignition switch to ON.

b. Operate blower motor.

c. Measure voltage between terminal BLWC of integration control and panel and body ground.

Toyota Sienna Air Conditioning Diagram

Fig. 104: Measuring Voltage Between Terminal BLWC Of Integration Control & Panel & Body Ground

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 104: Measuring Voltage Between Terminal BLWC Of Integration Control & Panel & Body Ground

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

OK: Go to step 3. NG: Go to next step. 2. Check blower motor.

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

PREPARATION:

Remove blower motor. CHECK:

Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1 of blower motor connector.

Blower motor operates smoothly.

2004 Toyota Sienna Wiring Diagrams

G02922252

Fig. 105: Checking Smoothly Operation Of Blower Motor Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: Replace blower motor. OK: Go to next step.

3. Check voltage between terminal VMC of integration control and panel and body ground. PREPARATION:

Remove the integration control and panel with connector still connected.

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

CHECK:

a. Turn ignition switch to ON.

b. Operate rear A/C blower motor.

c. Measure voltage between terminal VMC of integration control and panel and body ground, when blower switch is operated to following positions.

Automotive Vmc Circuits

Fig. 106: Measuring Voltage Between Terminal VMC Of Integration Control & Panel & Body Ground

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 106: Measuring Voltage Between Terminal VMC Of Integration Control & Panel & Body Ground

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

OK: Go to next step.

TABLE BLOWER SPEED AND VOLTAGE

Blower speed

Voltage

LO

7.2 V

ME

4.2 V

HI

0.5 V

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

NG: Go to next step. 4. Check power transistor.

PREPARATION:

Remove power transistor (See INSPECTION ). CHECK:

a. Connect the positive (+) lead from the battery to terminal 1 through a 12 V - 3.4 W test bulb and negative (-) lead to terminal 2.

b. Check the test bulb lights up when another positive (+) lead is connected to terminal 4 through a 12 V - 3.4 W test bulb.

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

Pressure Chart Diagnostic

G02922254

Fig. 107: Checking Test Bulb Lights Up Of Power Transistor Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Test bulb lights up.

CHECK:

Measure resistance between terminals 3 and 4. OK:

Pressure Chart Diagnostic

(

c

)

D

C

>

I

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

Fig. 108: Measuring Resistance Between Terminals 3 & 4 Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: Replace power transistor. OK: Go to next step.

5. Check harness and connector between integration control and panel and power transistor, power transistor and body ground (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).

NG: Repair or replace harness or connector.

OK: Check and replace integration control and panel.

COMPRESSOR CIRCUIT CIRCUIT DESCRIPTION

The integration control and panel outputs the magnetic clutch ON signal from terminal AC1 to the ECM. When the ECM receives this signal, it sends a signal from terminal ACMG and switches the A/C magnetic clutch relay ON, thus turning on the A/C magnetic clutch.

WIRING DIAGRAM

Compressor Wiring Diagram 4age 16v

Fig. 109: Wiring Diagram - Compressor Circuit Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. Read value of TOYOTA hand-held tester. PREPARATION:

a. Connect the TOYOTA hand-held tester to the DLC3.

b. Turn the ignition switch ON and push the TOYOTA hand-held tester main SW ON. CHECK:

Select the item "A/C SIG" in the DATA LIST and read its value displayed on the TOYOTA handheld tester.

Item

Measurement Item/ Display (Range)

Normal condition

Diagnostic code

A/C SIG

A/C SW Status/ ON or OfT

■A/C SW Push: ON •A/C SW Release; OFF

G02922257

Fig. 110: Data List Table

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NOTE: Check with the engine running.

NG: Go to step 6 . OK: Go to next step. 2. Check magnetic clutch relay.

PREPARATION:

Remove magnetic clutch relay from engine room J/B. CHECK:

Check continuity between each pair of terminals shown below of magnetic clutch relay. OK

TESTER CONNECTION SPECIFIED CONDITION I-1-1

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

1 - 2

62.5 - 90.9 ohm

3 - 5

No continuity

The Clutch Relay Corolla 2004

G02922258

Fig. 111: Checking Continuity Between Each Part Of Terminals Of Magnetic Clutch Relay Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

PREPARATION:

Apply battery positive (+) voltage between terminals 1 and 2. CHECK:

Check continuity between terminals 3 and 5. OK:

Continuity exists.

NG: Replace magnetic clutch relay. OK: Go to next step. 3. Read value of TOYOTA hand-held tester.

PREPARATION:

a. Connect the TOYOTA hand-held tester to the DLC3.

b. Turn the ignition switch ON and push the TOYOTA hand-held tester main SW ON. CHECK:

Select the item "A/C MAG CLUTCH" in the DATA LIST and read its value displayed on the TOYOTA hand held tester.

Item

Measurement Item/ Display (Range)

Normal condition

Diagnostic Note

A/C MAG CLUTCH

A/C magnet clutch Status/ ON or OFF

•A/C SW Push: ON •A/C SW Release: OFF

G&M222S9

Fig. 112: Data List Table

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NOTE: Check with the engine running.

NG: Repair or replace harness or connector. OK: Go to next step. 4. Check A/C magnetic clutch.

PREPARATION:

Disconnect magnetic clutch connector.

CHECK:

Connect positive (+) lead connected to battery to magnetic clutch connector terminal 3. OK:

Magnetic clutch is energized.

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

Fig. 113: Checking A/C Magnetic Clutch Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: Repair A/C magnetic clutch. OK: Go to next step.

5. Check harness and connector between magnetic clutch and battery (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).

NG: Repair or replace harness or connector.

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

6. Check voltage between terminal AC1, A/CS of integration control and panel connector and body around.

PREPARATION:

a. Remove integration control and panel with connector still connected.

b. Start the engine and push AUTO switch.

CHECK:

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

Check the voltage between terminal A/CS, AC1 of integration control and panel connector and body ground when magnetic clutch is ON and OFF by A/C switch.

TABLE A/C SWITCH SPECIFIED CON

DITION

Switch operation

Tester connection

Specified condition

ON

AC1 - Body ground

1.3 - 2.6 V

OFF

AC1 - Body ground

3.7 - 4.5 V

ON

A/CS - Body ground

10 - 14 V

OFF

A/CS - Body ground

Below 1.0 V

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

2004 Seqoia System And Diagrams
Fig. 114: Checking Voltage Between Terminals A/CS, AC1 Of Integration Control & Panel Connector & Body Ground

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: Check and replace integration control and panel. OK: Go to next step.

2004 HVAC Air Conditioning System - Sequoia

PRECAUTION

1. DO NOT HANDLE REFRIGERANT IN AN ENCLOSED AREA OR WEAR EYE PROTECTION

2. ALWAYS WEAR EYE PROTECTION

Low Pressure Valve Sienna

G02928519

Fig. 1: Identifying Refrigerant Handling Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

3. BE CAREFUL NOT TO GET LIQUID REFRIGERANT IN YOUR EYES OR ON YOUR SKIN

If liquid refrigerant gets in your eyes or on your skin.

2004 HVAC Air Conditioning System - Sequoia a. Wash the area with lots of cool water.

CAUTION: Do not rub your eyes or skin.

b. Apply clean petroleum jelly to the skin.

c. Go immediately to a physician or hospital for professional treatment.

4. NEVER HEAT CONTAINER OR EXPOSE IT TO NAKED FLAME

5. BE CAREFUL NOT TO DROP CONTAINER AND NOT TO APPLY PHYSICAL SHOCKS TO IT

Toyota Sienna Refrigerant

G02928520

Fig. 2: Avoiding Liquid Refrigerant From Eyes Or Skin Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

6. DO NOT OPERATE COMPRESSOR WITHOUT ENOUGH REFRIGERANT IN REFRIGERATION SYSTEM

If there is not enough refrigerant in the refrigerant system oil lubrication will be insufficient and

2004 HVAC Air Conditioning System - Sequoia compressor burnout may occur, so that care to avoid this, necessary care should be taken.

7. DO NOT OPEN PRESSURE MANIFOLD VALVE WHILE COMPRESSOR IS OPERATE

If the high pressure valve is opened, refrigerant flows in the reverse direction and could cause the charging cylinder to rupture, so open and close the only low pressure valve.

8. BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH REFRIGERANT

If refrigerant is overcharged, it causes problems such as insufficient cooling, poor fuel economy, engine overheating etc.

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