AC(diag)-16
Diagnostics for A/C System Malfunction
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
3
CHECK BLOWER MOTOR RELAY.
1) Turn the ignition switch to OFF.
2) Connect the battery positive terminal to the
blower motor relay terminal No. 2, and the neg-
ative terminal to No. 4.
3) Using the tester, measure the resistance
between terminals.
Connector & terminal
(Relay) No. 1 — No. 5:
Is the resistance less than 1
:
? Go to step
4
.
Replace the blower
motor relay.
4
CHECK HARNESS.
1) Remove the auto A/C control module.
2) Measure the resistance between auto A/C
control module and relay using a tester.
Connector & terminal
(B386) No. 4 — (i88) No. 9:
Is the resistance less than 1
:
? Go to step
5
.
Repair or replace
the harness.
5
CHECK BLOWER MOTOR POWER SUPPLY.
1) Install the blower motor relay and auto A/C
control module.
2) Turn the ignition switch to ON.
3) Turn the blower fan switch to ON.
4) Use a tester to measure the voltage
between the blower motor and chassis ground.
Connector & terminal
(B87) No. 2 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Go to step
6
.
Repair or replace
the harness
between relay and
the blower motor.
6
CHECK BLOWER MOTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from blower
motor.
3) Connect the battery positive terminal to the
blower motor connector terminal No. 2, and the
negative terminal to No. 1.
4) Make sure the blower motor runs.
Does the blower motor run?
Go to step
7
.
Replace the blower
motor. <Ref. to AC-
28, REMOVAL,
Blower Motor.>
7
CHECK HARNESS.
1) Disconnect the power transistor connector.
2) Disconnect the auto A/C control module
connector.
3) Using the tester, measure the resistance
between terminals of harness.
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:
Is the resistance less than 1
:
? Go to step
8
.
Repair or replace
the harness.
8
CHECK FAN CONTROL SIGNAL.
1) Connect the disconnected connectors.
2) Turn the ignition switch to ON.
3) Change the fan speed control dial from 1st
to 7th.
4) Measure the voltage between the power
transistor and chassis ground using a tester.
Connector & terminal
(B57) No. 2 (+) — Chassis ground (–):
Is the voltage approx. 10 V at
1st and approx. 1 V at 7th?
Replace the power
transistor. <Ref. to
AC-29, REMOVAL,
Power Transistor
(Auto A/C Model).>
Go to step
9
.
9
CHECK POOR CONTACT.
Check poor contact of auto A/C control module
connector.
Is there poor contact of connec-
tor?
Repair the connec-
tor.
Replace the auto
A/C control mod-
ule. <Ref. to AC-
33, REMOVAL,
Control Unit (Auto
A/C Model).>
Step
Check
Yes
No
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