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NO.4 WINDSHIELD FOGS

BME070301038206

4 | Windshield fogs.
DESCRIPTION | • Front climate control unit's FRESH indicator light does not illuminate while airflow is in DEFROSTER mode or HEAT/DEFROSTER mode.
POSSIBLE CAUSE | • Front climate control unit (IG2 signal) system malfunction • Front air intake actuator malfunction • Front climate control unit (RECIRCULATE, FRESH signal) system malfunction • Malfunction in blower unit's air intake doors

• 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 | VERIFY WHETHER MALFUNCTION IS IN A/C SYSTEM OR DEFROSTER SYSTEM • When both A/C and front fan switches in front climate control unit are on, does cool air blow out from front vents? | Yes | Go to next step.
No | Go to Step 1 of troubleshooting index No.11.
2 | INSPECT A/C FUSE • Is A/C fuse okay? | Yes | Go to next step.
No | • Inspect blown fuse's circuit for short to ground.

  - Repair or replace as necessary.
  - Install appropriate amperage fuse.

3 | INSPECT FRONT AIR INTAKE ACTUATOR • Inspect front air intake actuator as follows.

  - Is there grease on link?
  - Is link securely and properly positioned?
  - Is link free of obstructions?

• Are above items okay?
Yes
Go to next step.
No | Apply grease or install link properly and securely, remove obstruction, then go to Step 15.
*4 | INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND FRONT CLIMATE CONTROL UNIT FOR CONTINUITY • Turn ignition switch to ON position. • Disconnect front climate control unit connector (12-pin). • Test voltage at front climate control unit connector (12-pin for air intake mode).

  - Terminal B (IG2 signal)

• Is voltage approximately B+?
Yes
Go to next step.
No | Repair wiring harness between fuse block and front climate control unit, then go to Step 15.
5 | VERIFY WHETHER MALFUNCTION IS IN BLOWER UNIT'S AIR INTAKE DOORS OR ELSEWHERE • Does front air intake actuator link repeatedly alternate between fresh mode and recirculate mode? | Yes | Go to next step.
No | Go to Step 8.
6 | INSPECT FRONT AIR INTAKE ACTUATOR • Inspect front air intake actuator. (See FRONT AIR INTAKE ACTUATOR INSPECTION) • Is it okay? | Yes | Go to next step.
No | Replace front air intake actuator, then go to Step 15.
7 | INSPECT WIRING HARNESS BETWEEN FRONT CLIMATE CONTROL UNIT AND FRONT AIR INTAKE ACTUATOR FOR SHORT TO GROUND • Turn ignition switch to LOCK position. • Is there continuity between following front climate control unit connector (12-pin for air intake mode) terminals and ground?

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

Yes
Repair wiring harness between front climate control unit and front air intake actuator, then go to Step 15.
No | Replace front climate control unit, then go to Step 15.
8 | VERIFY WHETHER MALFUNCTION IS IN FRONT AIR INTAKE ACTUATOR SYSTEM OR BLOWER UNIT'S AIR INTAKE DOORS • Remove front air intake actuator. • Turn ignition switch to ON position. • Set front fan switch to 4th position. • Does air intake mode (RECIRCULATE, FRESH) change smoothly when air intake link is operated by hand? | Yes | Go to next step.
No | Go to Step 13.
9 | INSPECT FRONT AIR INTAKE ACTUATOR • Inspect front air intake actuator. (See FRONT AIR INTAKE ACTUATOR INSPECTION) • Is it okay? | Yes | Go to next step.
No | Replace front air intake actuator, then go to Step 15.
*10 | INSPECT WIRING HARNESS BETWEEN FRONT CLIMATE CONTROL UNIT AND FRONT AIR INTAKE ACTUATOR FOR CONTINUITY • Turn ignition switch to LOCK position. • Is there continuity between following front climate control unit connector (12-pin for air intake mode) terminals and front air intake actuator connector terminal?

  - Terminal C-Terminal C (FRESH signal)
  - Terminal E-Terminal A (RECIRCULATE signal)

Yes
Go to next step.
No | Repair wiring harness between front climate control unit and front air intake actuator, then go to Step 15.
*11 | INSPECT WIRING HARNESS BETWEEN FRONT CLIMATE CONTROL UNIT AND AIR INTAKE CONTOL UNIT AND FRONT AIR INTAKE ACTUATOR FOR SHORT TO GROUND • Is there continuity between following front climate control unit connector (12-pin for air intake mode) terminals and ground?

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

Yes
Repair wiring harness between front climate control unit and front air intake actuator, then go to Step 15.
No | Go to next step.
*12 | VERIFY WHETHER MALFUNCTION IS IN WIRING HARNESS (BETWEEN FRONT CLIMATE CONTROL UNIT AND FRONT AIR INTAKE ACTUATOR FOR SHORT TO B+) OR FRONT CLIMATE CONTROL UNIT • Turn ignition switch to ON position. • Test voltage at following front climate control unit connector (12-pin for air intake mode) terminals.

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

• Is voltage approximately B+?
Yes
Repair wiring harness between front climate control unit and front air intake actuator, then go to Step 15.
No | Replace front climate control unit, then go to Step 15.
13 | INSPECT BLOWER UNIT'S AIR INTAKE DOORS • Is there any foreign material or obstructions in blower unit's air intake doors? | Yes | Remove obstruction, then go to Step 15.
No | Go to next step.
14 | VERIFY THAT BLOWER UNIT'S AIR INTAKE DOOR IS POSITIONED SECURELY AND PROPERLY • Are blower unit's air intake doors securely and properly positioned? | Yes | Check air intake doors for cracks or damage, then go to next step.
No | Install air intake doors securely in proper position, then go to next step.
15 | VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER REPAIR • Does air circulate? | Yes | Troubleshooting completed. Explain repairs to customer.
No | Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.