NO.4 AIR INTAKE MODE DOES NOT CHANGE

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NO.4 AIR INTAKE MODE DOES NOT CHANGE

B3E070301038W06

4 | Air intake mode does not change.
DESCRIPTION | • Air intake mode does not change when switching REC/FRESH mode.
POSSIBLE CAUSE | • Air intake actuator malfunction (Steps 1-6) • Air intake door malfunction (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, inspect 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 the ignition switch to the ON position.
• Measure the voltages at the following climate control unit terminals.

  - Terminal O (24-pin, FRESH motor drive signal)
  - Terminal Q (24-pin, RECIRCULATE motor drive signal)
  (See CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER].)

• 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 CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR)

• Measure the voltages at the following air intake actuator terminals.

  - Terminal E (FRESH motor drive signal)
  - Terminal C (RECIRCULATE motor drive signal)

• Are voltages as shown below?

  - Terminal E: 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 the air intake actuator, then go to Step 8.

No | Repair the wiring harness between the 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 the air intake actuator connector.
• Measure the voltages at the following climate control unit terminals.

  - Terminal O (FRESH motor drive signal)
  - Terminal Q (RECIRCULATE motor drive signal)
  (See CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER].)

• Are voltages normal?

Yes

Inspect the 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 the climate control unit connector.
• Measure the voltages at the following climate control unit terminals.

  - Terminal O (FRESH motor drive signal)
  - Terminal Q (RECIRCULATE 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 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 the ignition switch to the LOCK position.
• Inspect for continuity at the following terminals between the climate control unit and ground.

  - Terminal O (FRESH motor drive signal)
  - Terminal Q (RECIRCULATE motor drive signal)

• Is there continuity?

Yes

Repair the wiring harness between the climate control unit and air intake actuator, then go to Step 8.

No | Go to the next step.

6

INSPECT AIR INTAKE LINK

• Inspect the air intake links.

  - 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 8.

7

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.
8 | CONFIRM THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER 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.