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NO.7 AMOUNT OF AIR BLOWING FROM REAR VENTS DOES NOT CHANGE

BME070300000W09

7 | Amount of air blowing from rear vents does not change.
DESCRIPTION | • Malfunction in rear blower system.
POSSIBLE CAUSE | • Malfunction in rear fan switch from rear climate control unit, rear main fan switch, or related wiring harnesses • Malfunction in rear main fan switch, or related wiring harnesses • Malfunction in rear blower resistor, rear blower relay, or related wiring harnesses
• Rear A/C unit malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | VERIFY WHETHER MALFUNCTION IS IN REAR FAN SWITCH SYSTEM OR REAR MAIN FAN SWITCH SYSTEM • Does air blow from rear vents when rear fan switch from rear climate control unit is on? | Yes | Go to Step 4.
No | Go to next step.
2 | VERIFY THAT REAR MAIN FAN SWITCH IS REAR POSITIONED • Is rear main fan switch in REAR position? | Yes | Go to next step.
No | Set rear main fan switch to REAR position, then go back to Step 1.
3 | INSPECT REAR FAN SWITCH, REAR MAIN FAN SWITCH AND RELATED WIRING HARNESSES • Inspect the following systems and electrical parts.

  - Rear fan switch from rear climate control unit
  - Rear main fan switch
  - Related wiring harnesses

• Are they okay?
Yes
Go to next step.
No | Repair or replace malfunctioning part, then go to Step 8.
4 | VERIFY WHETHER MALFUNCTION IS IN FAN FROM REAR A/C UNIT OR ELSEWHERE • Does air blow from rear vents when rear main fan switch is on? | Yes | Go to Step 7.
No | Go to next step.
5 | INSPECT REAR MAIN FAN SWITCH AND RELATED WIRING HARNESSES • Inspect the following systems and electrical parts.

  - Rear main fan switch
  - Related wiring harnesses

• Are they okay?
Yes
Go to next step.
No | Repair or replace malfunctioning part, then go to Step 8.
6 | INSPECT REAR BLOWER RESISTOR, REAR BLOWER RELAY AND RELATED WIRING HARNESSES • Inspect the following systems and electrical parts.

  - Rear blower resistor
  - Rear blower relay
  - Related wiring harnesses

• Are they okay?
Yes
Go to next step.
No | Repair or replace malfunctioning part, then go to Step 8.
7 | INSPECT FAN FROM REAR A/C UNIT • Inspect fan in rear A/C as follows.

  - Is fan free of interference from rear A/C unit case?
  - Is fan free of foreign material and obstructions?

• Is fan okay?
Yes
Check rear A/C unit intake vent for clogging, then go to next step.
No | Remove obstruction, repair or replace fan and rear A/C unit case, then go to next step.
8 | VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER REPAIR • Does air blow out? | Yes | Troubleshooting completed. Explain repairs to customer.
No | Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.