Troubleshooting

Symptom

Possible causes

Checks and corrections

Page

No blower operation

Blown circuit breaker

Replace

AC-9

Defective blower motor

Check and repair

AC-9

Defective heater relay

Check operation

AC-9

Defective A/C cut-off relay

Check operation

AC-9

Defective blower switch

Check for short or open

AC-9

Defective wiring connection

Check and repair

AC-9

No blower control

Blown blower resistor

Replace

AC-9

Defective blower switch

Check for short or open

AC-9

Defective temperature sensors (in-car sensor.

Check for short or open

AC-19

ambient sensor)

Defective rheostat

Check for short or open

AC-9

Defective power servo unit

Check operation

AC-17

Defective DVV

Check operation

AC-20

Defective amplifier

Check operation

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