NO.3 AIR INTAKE MODE DOES NOT CHANGE [FULL-AUTO AIR CONDITIONER]

id0703c1802900

3 | 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 • Switch the ignition to ON. • Test voltages at the following terminals of climate control unit. ― Terminal G (20-pin, ACTR POWER) ― Terminal I (20-pin, ACTR SIGNAL) ― Terminal H (20-pin, GND) (See CLIMATE CONTROL UNIT INSPECTION [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 A ― Terminal C • Are voltages as shown below? ― Terminal A: approx. 0.5 V during RECIRCULATE and approx. 10 V during FRESH ― Terminal C: approx. 10 V during RECIRCULATE and approx. 0.5 V during FRESH | Yes | Replace air intake actuator, then go to Step 8. (See AIR INTAKE ACTUATOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
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 G (20-pin, ACTR POWER) ― Terminal I (20-pin, ACTR SIGNAL) (See CLIMATE CONTROL UNIT INSPECTION [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 G (20-pin, ACTR POWER) ― Terminal I (20-pin, ACTR 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 • Switch the ignition to off. • Inspect for continuity at the following terminals between climate control unit and ground. ― Terminal G (20-pin, ACTR POWER) ― Terminal I (20-pin, ACTR 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. (See CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER].)
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.