NO.3 AIR INTAKE MODE FROM FRONT VENT DOES NOT CHANGE

id070300801700

3 | Air intake mode from front vent does not change.
DESCRIPTION | • Malfunction in A/C unit and/or front climate control unit air intake mode switching system • Air intake mode does not change when switching REC/FRESH mode.
POSSIBLE CAUSE | • Air intake actuator malfunction • Air intake door malfunction

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

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT AIR INTAKE ACTUATOR • Is the air intake actuator normal? | Yes | Go to the next step.
No | Replace the air intake actuator, then go to Step 9.
2* | INSPECT TO SEE WHETHER MALFUNCTION (OPEN OR SHORT CIRCUIT) IS IN AIR INTAKE ACTUATOR, WIRING HARNESS (BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR) OR ELSEWHERE • Turn the ignition switch to the ON position. • Measure the voltages at the following climate control unit terminals. R.H.D. ― Terminal 1K (24-pin, RECIRCULATE motor drive signal) ― Terminal 1M (24-pin, FRESH motor drive signal) (See FRONT CLIMATE CONTROL UNIT INSPECTION.) L.H.D. ― Terminal 1M (24-pin, RECIRCULATE motor drive signal) ― Terminal 1K (24-pin, FRESH motor drive signal) (See FRONT CLIMATE CONTROL UNIT INSPECTION.) • Are voltages normal? | Yes | Go to the next step.
No | Go to Step 4.
3* | INSPECT TO SEE WHETHER MALFUNCTION (OPEN OR SHORT CIRCUIT) IS IN AIR INTAKE ACTUATOR OR WIRING HARNESS (BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR) • Measure the voltages at the following air intake actuator terminals. R.H.D. ― Terminal A (RECIRCULATE motor drive signal) ― Terminal C (FRESH motor drive signal) L.H.D. ― Terminal C (RECIRCULATE motor drive signal) ― Terminal A (FRESH motor drive signal) • Are voltages as shown below? R.H.D. ― Terminal C: approx. 10 V during FRESH and approx. 0.5 V during RECIRCULATE ― Terminal A: approx. 0.5 V during FRESH and approx. 10 V during RECIRCULATE L.H.D. ― Terminal C: approx. 0.5 V during FRESH and approx. 10 V during RECIRCULATE ― Terminal A: approx. 10 V during FRESH and approx. 0.5 V during RECIRCULATE | Yes | Go to Step 7.
No | Repair the wiring harness between the climate control unit and air intake actuator, then go to Step 9.
4 | INSPECT TO SEE WHETHER MALFUNCTION IS IN AIR INTAKE ACTUATOR OR ELSEWHERE • Disconnect the air intake actuator connector. • Measure the voltages at the following climate control unit terminals. R.H.D. ― Terminal 1K (RECIRCULATE motor drive signal) ― Terminal 1M (FRESH motor drive signal) (See FRONT CLIMATE CONTROL UNIT INSPECTION.) L.H.D. ― Terminal 1M (RECIRCULATE motor drive signal) ― Terminal 1K (FRESH motor drive signal) (See FRONT CLIMATE CONTROL UNIT INSPECTION.) • Are voltages normal? | Yes | Inspect the air intake actuator, then go to Step 9.
No | Go to the next step.
5 | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO B+ BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR) OR ELSEWHERE • Disconnect the climate control unit connector. • Measure the voltages at the following climate control unit terminals. R.H.D. ― Terminal 1K (RECIRCULATE motor drive signal) ― Terminal 1M (FRESH motor drive signal) L.H.D. ― Terminal 1M (RECIRCULATE motor drive signal) ― Terminal 1K (FRESH motor drive signal) • Are voltages approx. 0 V? | Yes | Go to the next step.
No | Repair the wiring harness between the climate control unit and air intake actuator, then go to Step 9.
6 | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO GROUND BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR) OR ELSEWHERE • Turn the ignition switch to the OFF position. • Inspect for continuity at the following terminals between the climate control unit and ground. R.H.D. ― Terminal 1K (RECIRCULATE motor drive signal) ― Terminal 1M (FRESH motor drive signal) L.H.D. ― Terminal 1M (RECIRCULATE motor drive signal) ― Terminal 1K (FRESH motor drive signal) • Is there continuity? | Yes | Repair the wiring harness between the climate control unit and air intake actuator, then go to Step 9.
No | Go to the next step.
7 | INSPECT AIR INTAKE LINK • Inspect the air intake links for followings: ― Is there grease on link? ― Are the links securely and properly installed? ― Are the links free of obstructions and hindrances? • Are the above items normal? | Yes | Go to the next step.
No | Apply grease to the links. If any the links are damaged, replace the air intake actuator, then go to Step 9.
8 | INSPECT TO SEE WHETHER MALFUNCTION IS IN CLIMATE CONTROL UNIT OR AIR INTAKE DOOR • Inspect the A/C unit air intake door. ― Is the door free of obstructions, cracks, and damage? ― Are the doors securely and properly installed? • Are the above items normal? | Yes | Replace the climate control unit, then go to the next step.
No | Remove obstruction, or install the doors in the proper position. If any doors are cracked or damaged, replace them, then go to the next step.
9 | VERIFY REPAIR • Does the air intake mode change smoothly? | Yes | Troubleshooting completed. Explain repairs to customer.
No | Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.