DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
PERFORM ACTIVE TEST USING INTELLIGENT TESTER (BLOWER MOTOR)
CHECK HARNESS AND CONNECTOR (BLOWER WITH FAN MOTOR - BATTERY AND BODY GROUND)
CHECK HARNESS AND CONNECTOR (BLOWER WITH FAN MOTOR - AIR CONDITIONING AMPLIFIER)
CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
REPLACE BLOWER WITH FAN MOTOR SUB-ASSEMBLY
CHECK BLOWER WITH FAN MOTOR SUB-ASSEMBLY
AIR CONDITIONING SYSTEM (for Manual Air Conditioning System) - Blower Motor Circuit
DESCRIPTION
The blower with fan motor sub-assembly operates according to signals from the air conditioning amplifier assembly. The blower with fan motor sub-assembly speed signals are transmitted by changes in the duty ratio.
Duty Ratio:
The duty ratio is the ratio of the blower with fan motor sub-assembly on time (T1) to the total of the blower with fan motor sub-assembly on and off time (T2).
The air conditioning amplifier assembly controls the blower with fan motor sub-assembly speed.
WIRING DIAGRAM
INSPECTION PROCEDURE
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
| 1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (BLOWER MOTOR) |
Select the Active Test, use the intelligent tester to generate a control command, and then check that the blower with fan motor sub-assembly operates ().
Air Conditioner| Tester Display | Test Part | Control Range | Diagnostic Note |
| Blower Motor |
Blower with fan motor sub-assembly | Min.: 0, Max.: 31 | - |
- OK:
- Blower with fan motor sub-assembly operates and blower with fan motor sub-assembly speed changes.
| OK | |
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| PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE ()
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| 2.CHECK HARNESS AND CONNECTOR (BLOWER WITH FAN MOTOR - BATTERY AND BODY GROUND) |
Disconnect the A29 blower with fan motor sub-assembly connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| A29-3 (+B) - Body ground | Always | 11 to 14 V |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| A29-1 (GND) - Body ground | Always | Below 1 Ω |
Text in Illustration| *a | Front view of wire harness connector
(to Blower with Fan Motor Sub-assembly) |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 3.CHECK HARNESS AND CONNECTOR (BLOWER WITH FAN MOTOR - AIR CONDITIONING AMPLIFIER) |
Disconnect the E81 air conditioning amplifier assembly connector.
Disconnect the A29 blower with fan motor sub-assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| E81-23 (BLW) - A29-2 (SI) | Always | Below 1 Ω |
| E81-23 (BLW) - Body ground | Always | 10 kΩ or higher |
| E81-14 (GND) - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 4.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY |
Remove the air conditioning amplifier assembly with its connectors still connected ().
Using an oscilloscope, check the waveform.
Measurement Condition| Item | Content |
| Terminal No. (Symbol) | E81-23 (BLW) - E81-14 (GND) |
| Tool Setting | 1 V/DIV., 500 μs/DIV. |
| Condition | Ignition switch ON
Blower switch LO level |
- OK:
- Waveform is as shown in the illustration.
Text in Illustration| *a | Component with harness connected
(Air Conditioning Amplifier Assembly) |
- Waveform varies with the blower level.
| | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
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| 5.REPLACE BLOWER WITH FAN MOTOR SUB-ASSEMBLY |
Temporarily replace the blower with fan motor sub-assembly with a new or normally functioning one ().
| 6.CHECK BLOWER WITH FAN MOTOR SUB-ASSEMBLY |
Operate the blower with fan motor sub-assembly to check that it functions properly.
- OK:
- Blower with fan motor sub-assembly operates normally.
| | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
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| OK | |
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| END (BLOWER WITH FAN MOTOR SUB-ASSEMBLY IS FAULTY) |
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