NO.4 AIR INTAKE MODE DOES NOT CHANGE

id070300800700

4

Air intake mode does not change.

DESCRIPTION

• Air intake mode does not change when switching REC/FRESH mode.

POSSIBLE CAUSE

• Malfunction in air intake actuator (Steps 1-6)
• Malfunction in air intake door (Step 7)

• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harnesses are connected correctly and undamaged.

Diagnostic procedure

STEP

INSPECTION

ACTION

1*

INSPECT TO SEE WHETHER MALFUNCTION (LACK OF CONTINUITY) IS IN AIR INTAKE ACTUATOR, WIRING HARNESS (BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR) OR ELSEWHERE

• Turn ignition switch to ON position.
• Test voltages at the following terminals of climate control unit.
- Terminal 2K (12-pin, FRESH motor drive signal)
- Terminal 2I (12-pin, RECIRCULATE motor drive signal)
(See Full-auto Air Conditioner.)
• Are voltages okay?
Yes
Go to next step.
No
Go to Step 3.
2*

INSPECT TO SEE WHETHER MALFUNCTION (LACK OF CONTINUITY) IS IN AIR INTAKE ACTUATOR OR WIRING HARNESS (BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR)

• Test voltages at the following terminals of air intake actuator.
- Terminal D (FRESH motor drive signal)
- Terminal F (RECIRCULATE motor drive signal)
• Are voltages as shown below?
- Terminal D: approximately 0.5 V during RECIRCULATE and approximately 10 V during FRESH
- Terminal F: approximately 10 V during RECIRCULATE and approximately 0.5 V during FRESH
Yes
Replace air intake actuator, then go to Step 8.
No
Repair wiring harness between climate control unit and air intake actuator, then go to Step 8.
3

INSPECT TO SEE WHETHER MALFUNCTION IS IN AIR INTAKE ACTUATOR OR ELSEWHERE

• Disconnect air intake actuator connector.
• Test voltages at the following terminals of climate control unit.
- Terminal 2K (12-pin, FRESH motor drive signal)
- Terminal 2I (12-pin, RECIRCULATE motor drive signal)
(See Full-auto Air Conditioner)
• Are voltages okay?
Yes
Inspect air intake actuator, then go to Step 8.
No
Go to next step.
4

INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO B+ BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR) OR ELSEWHERE

• Disconnect climate control unit connector.
• Test voltages at the following terminals of climate control unit.
- Terminal 2K (12-pin, FRESH motor drive signal)
- Terminal 2I (12-pin, RECIRCULATE motor drive signal)
• Are voltages approximately 0 V?
Yes
Go to next step.
No
Repair wiring harness between climate control unit and air intake actuator, then go to Step 8.
5

INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO GROUND BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR) OR ELSEWHERE

• Turn ignition switch to LOCK position.
• Inspect for continuity at the following terminals between climate control unit and ground.
- Terminal 2K (12-pin, FRESH motor drive signal)
- Terminal 2I (12-pin, RECIRCULATE motor drive signal)
• Is there continuity?
Yes
Repair wiring harness between climate control unit and air intake actuator, then go to Step 8.
No
Go to next step.
6

INSPECT AIR INTAKE LINK

• Inspect air intake links.
- Is there grease on link?
- Are links securely and properly installed?
- Are links free of obstructions and hindrances?
• Are above items okay?
Yes
Go to next step.
No
Apply grease to links. If any links are damaged, replace air intake actuator, then go to Step 8.
7

INSPECT TO SEE WHETHER MALFUNCTION IS IN CLIMATE CONTROL UNIT OR AIR INTAKE DOOR

• Inspect blower unit air intake door.
- Is door free of obstructions, cracks, and damage?
- Are doors securely and properly installed?
• Are above items okay?
Yes
Replace climate control unit, then go to next step.
No
Remove obstruction, or install doors in proper position. If any doors are cracked or damaged, replace them, then go to next step.
8

CONFIRM THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR

• Does air intake mode change smoothly?
Yes
Troubleshooting completed. Explain repairs to customer.
No
Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.