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

id0703c1700600

DESCRIPTION

•  Temperature does not change when operating temperature control dial

•  Malfunction in electric system and/or climate control unit air mix system

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

POSSIBLE CAUSE

•  ROOM 25 A fuse malfunction

•  INTERIOR1 15A fuse malfunction

•  Open circuit in wiring harness between climate control unit terminal 2A and positive battery terminal

•  Short to ground in wiring harness between climate control unit terminal 2A and ROOM 25 A fuse

•  Air mix actuator connector malfunction

•  Climate control unit connector malfunction

•  Air mix actuator malfunction

•  Climate control unit malfunction

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

L.H.D.:

―  Climate control unit terminal 1U — driver-side air mix actuator terminal G

―  Climate control unit terminal 1J — driver-side air mix actuator terminal F

―  Climate control unit terminal 1A — driver-side air mix actuator terminal E

―  Climate control unit terminal 2H — driver-side air mix actuator terminal B

―  Climate control unit terminal 2F — driver-side air mix actuator terminal C

―  Climate control unit terminal 1U — passenger-side air mix actuator terminal E

―  Climate control unit terminal 1H — passenger-side air mix actuator terminal F

―  Climate control unit terminal 1A — passenger-side air mix actuator terminal G

―  Climate control unit terminal 2L— passenger-side air mix actuator terminal C

―  Climate control unit terminal 2J — passenger-side air mix actuator terminal B

R.H.D.:

―  Climate control unit terminal 1U — driver-side air mix actuator terminal E

―  Climate control unit terminal 1H — driver-side air mix actuator terminal F

―  Climate control unit terminal 1A — driver-side air mix actuator terminal G

―  Climate control unit terminal 2L— driver-side air mix actuator terminal C

―  Climate control unit terminal 2J — driver-side air mix actuator terminal B

―  Climate control unit terminal 1U — passenger-side air mix actuator terminal G

―  Climate control unit terminal 1J — passenger-side air mix actuator terminal F

―  Climate control unit terminal 1A — passenger-side air mix actuator terminal E

―  Climate control unit terminal 2H — passenger-side air mix actuator terminal B

―  Climate control unit terminal 2F — passenger-side air mix actuator terminal C

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

L.H.D.:

―  Climate control unit terminal 1A — air intake actuator terminal E

―  Climate control unit terminal 1U — air intake actuator terminal C

R.H.D.:

―  Climate control unit terminal 1A — air intake actuator terminal C

―  Climate control unit terminal 1U — air intake actuator terminal E

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

―  Climate control unit terminal 1A — airflow mode actuator terminal A

―  Climate control unit terminal 1U — airflow mode actuator terminal B

―  Climate control unit terminal 1U — solar radiation sensor terminal A

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

―  Climate control unit terminal 1A — cabin temperature sensor terminal B

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

―  Climate control unit terminal 1A — 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 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 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 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 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.