NO TEMPERATURE CONTROL WITH REAR CLIMATE CONTROL UNIT [FULL-AUTO AIR CONDITIONER]

id0703c1007000

DESCRIPTION
•  Temperature does not change when operating temperature control switch
•  Malfunction in A/C unit and/or rear climate control unit air mix system
•  Malfunction in rear air mix actuator or related wiring harness
POSSIBLE CAUSE
•  ROOM 15 A fuse malfunction
•  Open circuit in wiring harness between rear climate control unit terminal V and positive battery terminal
•  Short to ground in wiring harness between rear climate control unit terminal V and ROOM 15 A fuse
•  Rear air mix actuator connector malfunction
•  Rear climate control unit connector malfunction
•  Rear air mix actuator malfunction
•  Rear climate control unit malfunction
•  Open circuit or short to ground or short to power supply in wiring harness between the following terminals:
―  Rear climate control unit terminal W — rear air mix actuator terminal A
―  Rear climate control unit terminal S — rear air mix actuator terminal B
―  Rear climate control unit terminal O — rear air mix actuator terminal C
―  Rear climate control unit terminal G — rear air mix actuator terminal D
―  Rear climate control unit terminal E — rear air mix actuator terminal E
•  Short to ground or short to power supply in wiring harness between the following terminals:
―  Rear climate control unit terminal W — rear airflow mode actuator terminal C
―  Rear climate control unit terminal O — rear airflow mode actuator terminal A
•  Air mix link malfunction
―  Lack of grease
―  Bad installation
•  Air mix door malfunction
―  Bad installation
―  Damage

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT COOLANT TEMPERATURE
•  Is the coolant sufficiently warmed up?
Yes
Go to the next step.
No
Warm up the engine, then go to Step 4.
2
PERFORM CLIMATE CONTROL UNIT DTC INSPECTION
•  Perform the climate control unit DTC inspection using the M-MDS.
•  Are any DTCs displayed?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
No
Go to the next step.
3
INSPECT REAR AIR MIX LINK PART
•  Inspect the front air mix actuator and air mix link
―  Is grease on link?
―  Are links securely and properly installed?
―  Are links free of obstructions and hindrances?
•  Are the above items normal?
Yes
Inspect the air mix door for the following items.
•  Verify if there is no abnormal noise, cracks, or damage.
•  Are doors securely and properly installed?
If there is foreign matter, remove it or securely install the air mix door to the correct position.
If the air mix door is cracked or damaged, replace the air mix door.
Go to the next step.
No
Apply grease or securely install to the correct positions.
If there is a malfunction in the rear air mix link, replace the rear air mix link.
(See REAR A/C UNIT DISASSEMBLY/ASSEMBLY.)
Go to the next step.
4
VERIFY THAT MALFUNCTION SYMPTOM DOES NOT RECUR AFTER REPAIR
•  Does the temperature change when the temperature control dial is operated?
Yes
Troubleshooting completed.
Explain repairs to customer.
No
Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.