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 (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 A/C AMPLIFIER AND AIR INTAKE ACTUATOR) OR ELSEWHERE
•  Turn ignition switch to ON position.
•  Test voltages at the following terminals of A/C amplifier:
―  Terminal 1I (24-pin, FRESH motor drive signal)
―  Terminal 1J (24-pin, RECIRCULATE motor drive signal)
•  Are voltages normal?
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 A/C AMPLIFIER AND AIR INTAKE ACTUATOR)
•  Test voltages at the following terminals of air intake actuator:
―  Terminal A (FRESH motor drive signal)
―  Terminal C (RECIRCULATE motor drive signal)
•  Are voltages as shown below?
―  Terminal A: approx. 0.5 V switched to RECIRCULATE and approx. 10 V switched to FRESH
―  Terminal C: approx. 10 V switched to RECIRCULATE and approx. 0.5 V switched to 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 A/C amplifier 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 A/C amplifier:
―  Terminal 1I (24-pin, FRESH motor drive signal)
―  Terminal 1J (24-pin, RECIRCULATE motor drive signal)
•  Are voltages normal?
Yes
Inspect air intake actuator, then go to Step 8.
(See AIR INTAKE ACTUATOR INSPECTION [FULL-AUTO AIR CONDITIONER].)
No
Go to the next step.
4
INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO B+ BETWEEN A/C AMPLIFIER AND AIR INTAKE ACTUATOR) OR ELSEWHERE
•  Disconnect A/C amplifier connector.
•  Test voltages at the following terminals of A/C amplifier:
―  Terminal 1I (24-pin, FRESH motor drive signal)
―  Terminal 1J (24-pin, RECIRCULATE motor drive signal)
•  Are voltages approx. 0 V?
Yes
Go to the next step.
No
Repair wiring harness between A/C amplifier and air intake actuator, then go to Step 8.
5
INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO GROUND BETWEEN A/C AMPLIFIER AND AIR INTAKE ACTUATOR) OR ELSEWHERE
•  Turn ignition switch to LOCK position.
•  Inspect for continuity at the following terminals between A/C amplifier and ground:
―  Terminal 1I (24-pin, FRESH motor drive signal)
―  Terminal 1J (24-pin, RECIRCULATE motor drive signal)
•  Is there continuity?
Yes
Repair wiring harness between A/C amplifier 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 normal?
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 A/C AMPLIFIER 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 normal?
Yes
Replace A/C amplifier, 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.