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NO.4 AIR INTAKE MODE DOES NOT CHANGE

BHE070301038W06

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 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) (See A/C AMPLIFIER INSPECTION [FULL-AUTO AIR CONDITIONER].) • Are voltages normal? | 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 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 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.)
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) (See A/C AMPLIFIER INSPECTION [FULL-AUTO AIR CONDITIONER]) • Are voltages normal? | Yes | Inspect air intake actuator, then go to Step 8. (See AIR INTAKE ACTUATOR INSPECTION.)
No | Go to 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 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 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 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 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.