Troubleshooting
U-38
Step Inspection Action
*5
Inspect continuity of wiring harness between
fuse block and front climate control unit.
l Turn ignition switch to on position.
l Turn both a/c switch and fan switch on.
l Remove airflow mode cable and air mix
cable, remove the front climate unit.
l Measure voltage at front climate control
unit connector terminal b (ig2 signal).
l Is voltage approximately equivalent to b+
(positive battery voltage)?
Yes Go to next step.
No Repair wiring harness between fuse
block and front climate control unit, go
to step 28.
*6
Inspect continuity of wiring harness between
front climate control unit and resistor.
l Turn ignition switch to on position.
l Turn off front fan switch.
l Measure voltage at front climate control
unit terminal f (blower fan signal).
l Is voltage approximately equivalent to b+
(positive battery voltage)?
Yes Go to next step.
No Inspect wiring harness between front
climate control unit and resistor, then go
to step 28.
*7
Verify whether malfunction is in wiring
harness (front climate control unit is
grounded) or front climate control unit.
l Turn ignition switch to lock position.
l Is front climate control unit terminal d (gnd
signal) grounded?
Yes Replace front climate control unit, then
go to step 28.
No Repair wiring harness between fuse
block and a/c relay, then go to step 28.
8
Inspect for dtcs of pcm.
l Check the dtcs in on-board diagnostic
system (engine control).
l Is there any dtc displayed?
Yes Go to appropriate inspection procedure.
(the cause may be a/c input signal cut-off
of pcm)
No Go to next step.
*9
Verify whether malfunction is in
electromagnetic cultch system or elsewhere.
l Remove a/c relay.
l Turn ignition switch to on position.
l When a/c relay connector terminals c short
circuit with d (on wire harness side), does
electromagnetic clutch operate?
Yes Go to next step.
No Go to step 24.
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