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NO.8 AIRFLOW MODE FROM REAR VENTS DOES NOT CHANGE

BME070300000W10

8 | Airflow mode from rear vents does not change.
DESCRIPTION | • Malfunction in rear A/C unit's airflow system.
POSSIBLE CAUSE | • Malfunction in rear A/C unit's airflow mode lever or airflow mode crank • Rear airflow mode actuator IG1 signal circuit malfunction • Malfunction in rear airflow mode actuator, rear climate control unit's each signal circuit • Malfunction in rear A/C unit's airflow mode door

• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while doing 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 REAR A/C UNIT'S REAR AIRFLOW MODE ACTUATOR • Remove rear A/C unit's rear airflow mode actuator. • Inspect rear A/C unit's airflow mode lever and crank.

  - Is there grease on lever and crank?
  - Are lever and crank securely in their proper positions?

• Are above items all okay?
Yes
Go to next step.
No | Apply grease or install lever and crank securely in their proper positions, then go to Step 9.
2 | VERIFY WHETHER MALFUNCTION IS IN REAR AIRFLOW MODE ACTUATOR SYSTEM OR REAR A/C UNIT'S AIRFLOW MODE DOOR • Turn ignition switch to ON position. • Set rear main fan switch at third position. • Is each rear airflow mode and air mix (VENT, BI-LEVEL and HEAT) accessed smoothly when airflow mode crank is operated by hand? | Yes | Go to next step.
No | Go to next Step 7.
*3 | INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND REAR AIRFLOW MODE ACTUATOR FOR CONTINUITY • Test voltage at rear airflow mode actuator terminal F (motor drive). • Is voltage approximately B+? | Yes | Go to next step.
No | Repair wiring harness between fuse block and rear airflow mode actuator, then go to Step 9.
4 | INSPECT REAR AIRFLOW MODE ACTUATOR • Inspect rear airflow mode actuator. (See REAR AIRFLOW MODE ACTUATOR INSPECTION.) • Is it okay? | Yes | Go to next step.
No | Replace rear airflow mode actuator, then go to Step 9.
*5 | INSPECT WIRING HARNESS BETWEEN REAR CLIMATE CONTROL UNIT AND REAR AIRFLOW MODE ACTUATOR FOR CONTINUITY • Turn ignition switch to LOCK position. • Disconnect rear climate control unit connector and rear airflow mode actuator connector. • Inspect for continuity between the following terminals.

  - Terminal D (rear climate control unit)-Terminal G (rear airflow mode actuator)
  - Terminal I (rear climate control unit)-Terminal A (rear airflow mode actuator)
  - Terminal K (rear climate control unit)-Terminal B (rear airflow mode actuator)
  - Terminal M (rear climate control unit)-Terminal C (rear airflow mode actuator)
  - Terminal O (rear climate control unit)-Terminal F (rear airflow mode actuator)

• Is there continuity?
Yes
Go to next step.
No | Repair wiring harness between rear climate control unit and rear airflow mode actuator, then go to Step 9.
*6 | INSPECT WIRING HARNESS BETWEEN REAR CLIMATE CONTROL UNIT AND REAR AIRFLOW MODE ACTUATOR FOR SHORT TO GROUND • Inspect for no continuity between the following terminals and ground.

  - Terminal D (rear climate control unit)-Terminal G (rear airflow mode actuator)
  - Terminal I (rear climate control unit)-Terminal A (rear airflow mode actuator)
  - Terminal K (rear climate control unit)-Terminal B (rear airflow mode actuator)
  - Terminal M (rear climate control unit)-Terminal C (rear airflow mode actuator)
  - Terminal O (rear climate control unit)-Terminal F (rear airflow mode actuator)

• Is there no continuity?
Yes
Go to next step.
No | Repair wiring harness between rear climate control unit and rear airflow mode actuator, go to Step 9.
7 | INSPECT REAR A/C UNIT • Is there any foreign material or obstructions in rear A/C unit's airflow mode door? | Yes | Remove obstruction, then go to Step 9.
No | Go to next step.
8 | INSPECT REAR A/C UNIT'S AIRFLOW MODE DOOR • Inspect rear A/C unit's airflow mode door as follows.

  - Is airflow mode door free of cracks and damage?
  - Is airflow mode door securely and properly installed?

• Are above items okay?
Yes
Replace rear climate control unit, then go to next step.
No | Replace airflow mode door or install airflow mode door securely in proper position, then go to next step.
9 | VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER REPAIR • Does airflow mode change? | Yes | Troubleshooting completed. Explain repairs to customer.
No | Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.