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

id0703c1006900

DESCRIPTION

•  Temperature does not change when operating temperature control dial

•  Malfunction in A/C unit and/or front climate control unit air mix system

•  Malfunction in driver and/or passenger side front air mix actuator or related wiring harness

POSSIBLE CAUSE

•  ROOM 15 A fuse malfunction

•  Open circuit in wiring harness between front climate control unit terminal 1U and positive battery terminal

•  Short to ground in wiring harness between front climate control unit terminal 1U and ROOM 15 A fuse

•  Front air mix actuator connector malfunction

•  Front climate control unit connector malfunction

•  Front air mix actuator malfunction

•  Front climate control unit malfunction

•  Open circuit or short to ground or short to power supply in wiring harness between the following terminals:

―  Front climate control unit terminal 1C — driver-side front air mix actuator terminal C

―  Front climate control unit terminal 2I — driver-side front air mix actuator terminal B

―  Front climate control unit terminal 1Q — driver-side front air mix actuator terminal A

―  Front climate control unit terminal 2A — driver-side front air mix actuator terminal E

―  Front climate control unit terminal 2C — driver-side front air mix actuator terminal D

―  Front climate control unit terminal 1C — passenger-side front air mix actuator terminal A

―  Front climate control unit terminal 2K — passenger-side front air mix actuator terminal B

―  Front climate control unit terminal 1Q — passenger-side front air mix actuator terminal C

―  Front climate control unit terminal 1J — passenger-side front air mix actuator terminal D

―  Front climate control unit terminal 1L — passenger-side front air mix actuator terminal E

•  Short to ground or short to power supply in wiring harness between the following terminals:

―  Front climate control unit terminal 1C — air intake actuator terminal C

―  Front climate control unit terminal 1Q — air intake actuator terminal A

―  Front climate control unit terminal 1C — front airflow mode actuator terminal C

―  Front climate control unit terminal 1Q — front airflow mode actuator terminal A

―  Front climate control unit terminal 1C — solar radiation sensor terminal A

•  Short to power supply in wiring harness between the following terminals:

―  Front climate control unit terminal 1Q — cabin temperature sensor terminal B

•  Short to power supply in wiring harness between the following terminals:

―  Front climate control unit terminal 1Q — evaporator temperature sensor 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.
(See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

•  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 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 air mix link, replace the air mix link.

(See FRONT 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.

Step	Inspection		Action
1	INSPECT COOLANT TEMPERATURE • Is the coolant sufficiently warmed up?	Yes	Go to the next step.
1		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. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Are any DTCs displayed?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
2		No	Go to the next step.
3	INSPECT 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.
3		No	Apply grease or securely install to the correct positions. If there is a malfunction in the air mix link, replace the air mix link. (See FRONT 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.
4		No	Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.