1.CHECK FUSE.
1) Remove fuse No. 22, 27 and 28 from fuse & relay box.
2) Check the condition of fuse.
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2.CHECK BLOWER MOTOR RELAY POWER SUPPLY.
1) Turn the ignition switch to OFF.
2) Remove the blower motor relay.
3) Turn the ignition switch to ON.
4) Use a tester to measure the voltage between the blower motor relay connector and chassis ground.
Connector & terminal
(B386) No. 2 — Chassis ground:
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Is the voltage 10 V or more?
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Repair the open circuit of blower motor power supply line harness.
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3.CHECK BLOWER MOTOR RELAY POWER SUPPLY.
1) Turn the ignition switch to ON.
2) Turn the blower switch to ON.
3) Use a tester to measure the voltage between the blower motor relay connectors.
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Is the voltage 10 V or more?
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4.CHECK HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the auto A/C control module connector (i88).
3) Use a tester to measure the resistance between harness terminals.
Connector & terminal
(B386) No. 4 — (i88) No. 9:
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Is the resistance less than 1 Ω?
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Repair or replace the open circuit of the harness.
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5.CHECK BLOWER MOTOR RELAY.
1) Turn the ignition switch to OFF.
2) Remove the blower motor relay.
3) Connect the battery terminal to the blower motor relay.
: No. 2 — No. 4
4) Measure the resistance between terminals.
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Is the resistance less than 1 Ω?
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Replace the blower motor relay. 
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6.CHECK BLOWER MOTOR POWER SUPPLY.
1) Turn the ignition switch to OFF.
2) Install the blower motor relay.
3) Disconnect the blower motor connector.
4) Turn the ignition switch to ON.
5) Turn the blower switch to ON.
6) Use a tester to measure the voltage between the blower motor connector and chassis ground.
Connector & terminal
(B87) No. 2 — Chassis ground:
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Is the voltage 10 V or more?
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Repair or replace the harness between the blower motor relay and the blower motor.
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7.CHECK BLOWER MOTOR.
1) Disconnect the connector from blower motor.
2) Connect the battery positive terminal to terminal No. 2 of blower motor connector, and negative terminal to terminal No. 1.
3) Make sure the blower motor runs.
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Does the blower motor run?
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Replace the blower motor.
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8.CHECK HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the power transistor connector.
3) Disconnect the auto A/C control module connector.
4) Use a tester to measure the resistance between harness terminals.
Connector & terminal
(B57) No. 1 — Chassis ground:
(B57) No. 2 — (i88) No. 40:
(B57) No. 3 — (B87) No. 1:
(B57) No. 4 — (B87) No. 2:
(B57) No. 4 — (B386) No. 5:
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Is the resistance less than 1 Ω?
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Repair or replace the harness.
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9.CHECK FAN CONTROL SIGNAL.
1) Turn the ignition switch to OFF.
2) Connect the blower motor and auto A/C control module.
3) Turn the ignition switch to ON.
4) Set the fan dial to 1st — 7th.
5) Use a tester to measure the voltage between the power transistor connector and chassis ground.
Connector & terminal
(B57) No. 2 (+) — Chassis ground (−):
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Is approx. 10 V detected in 1st, and 1 V at 7th?
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Replace the power transistor.
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10.CHECK POOR CONTACT.
Check poor contact of auto A/C control module connector.
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Is there poor contact of connector?
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Replace the auto A/C control module.
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