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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 • Malfunction in air intake door

• 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 the 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: approx. 0.5 V during RECIRCULATE and approx. 10 V during FRESH - Terminal F: approx. 10 V during RECIRCULATE and approx. 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 the 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 approx. 0 V? | Yes | Go to the 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 the 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 the 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 the next step.
No | Remove obstruction, or install doors in proper position. If any doors are cracked or damaged, replace them, then go to the 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.