Troubleshotting
U-27
Step Inspection Action
7
Inspect rear a/c unit
l Is there any foreign material or obstruction
in a/c unit airflow mode control valve?
Yes Remove obstruction, go to step 9
No Go to next step.
8 Inspect rear a/c unit airflow mode control
valve.
l Inspect rear a/c unit airflow mode control
valve.
— Is there any damage or crack at airflow
mode valve?
— Is airflow mode control valve firmly
installed in proper position?
l Are all above items normal?
Yes Replace the rear climate control unit, go
to next step.
No Replace airflow mode control valve or
install it in proper position, go to next
step.
9
Verify whether malfunction symptom occurs
after repair.
l Does airflow mode change?
Yes Troubleshooting completed. Explain
causes to customer.
No Recheck malfunction symptoms, then
repeat from step 1 if malfunction
reoccurs.
Ix. Temperature control is failed for rear climate control unit.
9 Temperature control is failed to rear climate control unit
Malfunction
symptom
Malfunction in air mix system or heater pipeline of rear a/c unit.
Possible causes
l Malfunction in air mix actuators’ +5v signal circuit. Steps 2-5
l Malfunction in air mix actuators’ voltage divider input signal circuit. Steps 6-8
l Malfunction in air mix actuators’ gnd signal circuit. Steps 9-11
l Malfunction in air mix actuators’ motor driving signal circuit. Steps 12-14
l Malfunction in rear a/c unit air mix control links or rockers. Step 15
l Malfunction in air mix actuator. Step 17
l Malfunction in rear a/c unit air mix control valve. Steps 18, 19
l Malfunction in heater pipeline. Step 20
When performing an asterisked (*) troubleshooting, shake the wiring harness and connectors to verify
whether the intermittent malfunctions are caused by poor contact. If there is a problem, check to make sure
connectors, terminals and wiring harness are connected correctly and undamaged.
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