TSRM/MK4 Supra/Repair Manual
Repair ManualWiring Diagrams
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AC/Air Conditioning, page 61

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p.062
Air Conditioning — MK4 Supra Air Conditioning, page 61
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Page text (OCR transcript)
AC–61
AIR CONDITIONING SYSTEM – TROUBLESHOOTING

2  Check blower motor.

P  Remove blower motor control (see page AC–99).

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

OK  Blower motor operates smoothly.

2  1

N08820

OK

NG  Replace blower motor.

Go to step 3 .

3  Check blower motor control relay.

P  Remove blower motor control relay with connectors
still connected

C  1.  Turn ignition switch To ON.
2.  Operate blower motor.

OK
Terminals          Standard Value

GND ↔ Body
Ground          Continuity

+B ↔ Body
Ground          Battery Positive
                        Voltage

M+ ↔ Body
Ground          Battery Positive
                        Voltage

M+ ↔ M–         Battery Positive
                        Voltage

SI ↔ Body
Ground          1 ~ 3 V

GND     M–

SI    +B    M+

E01520

OK

NG  Replace blower motor control relay.

Repair or replace harness or connector