AC(diag)-32
Diagnostic Procedure for Sensors
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK IN-VEHICLE SENSOR.
1) Turn the ignition switch to OFF.
2) Remove the driver’s side lower cover.
3) Disconnect the connector from in-vehicle
sensor.
4) Measure the resistance between connector
terminals of in-vehicle sensor.
Terminals
No. 1 — No. 2:
Is the resistance approximately
2.7 k
: at 20°C (68°F) ?
Go to step 2.
Replace the in-
vehicle sensor.
2
CHECK INPUT SIGNAL FOR IN-VEHICLE
SENSOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between in-vehicle
sensor harness connector terminal and chassis
ground.
Connector & terminal
(i55) No. 2 (+) — No. 1 (–):
Is the voltage approx. 5 V?
Go to step 6.
Go to step 3.
3
CHECK AUTO A/C CONTROL MODULE
OUTPUT SIGNAL.
1) Turn the ignition switch to OFF.
2) Remove the auto A/C control module.
3) Turn the ignition switch to ON.
4) Measure the voltage between connector
terminals of auto A/C control module.
Connector & terminal
(B282) No. 5 (+) — (B282) No. 27 (–):
Is the voltage approx. 5 V?
Go to step 4.
Go to step 6.
4
CHECK HARNESS BETWEEN AUTO A/C
CONTROL MODULE AND IN-VEHICLE SEN-
SOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the auto A/C
control module.
3) Measure the resistance of harness between
auto A/C control module and in-vehicle sensor.
Connector & terminal
(i55) No. 2 — (B282) No. 5:
Is the resistance less than 1
:? Go to step 5.
Repair the harness
between auto A/C
control module and
in-vehicle sensor.
5
CHECK HARNESS BETWEEN AUTO A/C
CONTROL MODULE AND IN-VEHICLE SEN-
SOR.
Measure the resistance of harness between
auto A/C control module and in-vehicle sensor.
Connector & terminal
(i55) No. 1 — (B282) No. 27:
Is the resistance less than 1
:? Go to step 6.
Repair the harness
between auto A/C
control module and
in-vehicle sensor.
6
CHECK POOR CONTACT.
Check poor contact of auto A/C control module
connector.
Is there poor contact in connec-
tor?
Repair the connec-
tor.
Replace the auto
A/C control mod-
ule.