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NO.6 WINDSHIELD FOGGED

BHE070301038W08

6 | Windshield fogged.
DESCRIPTION | • A/C compressor does not operate while airflow mode is in DEFROSTER or HEAT/DEF modes. • Air intake mode does not change to FRESH while airflow mode is in DEFROSTER or HEAT/DEF modes.
POSSIBLE CAUSE | • A/C amplifier (B+ signal) system malfunction (Steps 2, 4, 5) • Air intake actuator malfunction (Steps 3, 7) • A/C amplifier (RECIRCULATE, FRESH signal) system malfunction (Steps 9-11) • Malfunction in blower unit air intake doors (Steps 12, 13)

• 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 harness are connected correctly and undamaged.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | COOL AIR BLOW OUT INSPECTION • When both A/C and fan switch in A/C amplifier are on, does cool air blow out from front vent? | Yes | Go to next step.
No | Go to Step 1 of troubleshooting index No.7.
2 | INSPECT A/C AMPLIFIER POWER SUPPLY FUSE FOR B+ SIGNAL • Is A/C amplifier power supply fuse for B+ signal normal? | Yes | Go to next step.
No | Inspect for a short to ground on blown fuse circuit. • Repair or replace as necessary. Install appropriate amperage fuse.
3 | INSPECT AIR INTAKE ACTUATOR • Inspect air intake actuator. – Is there grease on link? – Is link securely and properly positioned? – Is link free of obstructions? • Are above items normal? | Yes | Go to next step.
No | Apply grease or install link properly and securely, remove obstruction, then go to Step 14.
4* | INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND A/C AMPLIFIER FOR CONTINUITY • Disconnect A/C amplifier connector (16-pin). • Turn ignition switch to ON position. • Test voltage at A/C amplifier connector terminal 2A (B+ signal). • Is voltage approx. 12 V? | Yes | Go to next step.
No | Repair wiring harness between fuse block and A/C amplifier, then go to Step 14.
5* | INSPECT WIRING HARNESS BETWEEN A/C AMPLIFIER AND GROUND FOR VOLTAGE • Test voltage at A/C amplifier connector terminal 2N (Ground). • Is voltage approx. 0V? | Yes | Go to next step.
No | Repair wiring harness between A/C amplifier and ground, then go to Step 14.
6 | VERIFY WHETHER MALFUNCTION IS IN BLOWER UNIT AIR INTAKE DOOR OR ELSEWHERE • Turn ignition switch to LOCK position. • Connect A/C amplifier connector (16-pin). • Remove air intake actuator. • Turn ignition switch to ON position. • Set 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 12.
7 | INSPECT AIR INTAKE ACTUATOR • Inspect air intake actuator. (See AIR INTAKE ACTUATOR INSPECTION) • Is it normal? | Yes | Go to next step.
No | Replace air intake actuator, go to Step 14. (See AIR INTAKE ACTUATOR REMOVAL/INSTALLATION.)
8 | INSPECT AIR INTAKE SELECTOR SWITCH AND DEFROSTER SWITCH IN A/C AMPLIFIER • Test voltage at A/C amplifier connector (24-pin) terminals 1I and 1J. • Is it normal? | Yes | Go to next step.
No | Replace A/C amplifier, then go to Step 14.
9* | INSPECT WIRING HARNESS BETWEEN A/C AMPLIFIER AND AIR INTAKE ACTUATOR FOR CONTINUITY • Turn ignition switch to LOCK position. • Is there continuity between the following A/C amplifier connector (24-pin) terminals and air intake actuator connector terminals? – Terminal 1I-Terminal A (FRESH signal) – Terminal 1J-Terminal C (RECIRCULATE signal) | Yes | Go to next step.
No | Repair wiring harness between A/C amplifier and air intake actuator, then go to Step 14.
10* | INSPECT WIRING HARNESS BETWEEN A/C AMPLIFIER AND AIR INTAKE ACTUATOR FOR SHORT TO GROUND • Is there continuity between the following A/C amplifier connector (24-pin) terminals and ground? – Terminal 1I (FRESH signal) – Terminal 1J (RECIRCULATE signal) | Yes | Repair wiring harness between A/C amplifier and air intake actuator, then go to Step 14.
No | Go to next step.
11* | INSPECT WIRING HARNESS BETWEEN A/C AMPLIFIER AND AIR INTAKE ACTUATOR FOR SHORT TO B+ • Turn ignition switch to ON position • Test voltage at the following A/C amplifier connector (24-pin) terminal: – Terminal 1I (FRESH signal) – Terminal 1J (RECIRCULATE signal) • Is voltage approx. 12 V? | Yes | Repair wiring harness between A/C amplifier and air intake actuator, then go to Step 14.
No | Replace A/C amplifier, then go to Step 14.
12 | INSPECT BLOWER UNIT AIR INTAKE DOOR • Is there any foreign material or obstruction in blower unit air intake door? | Yes | Remove obstruction, then go to Step 14.
No | Go to next step.
13 | VERIFY THAT BLOWER UNIT AIR INTAKE DOOR IS POSITIONED SECURELY AND PROPERLY • Is blower unit air intake door securely and properly positioned? | Yes | Inspect air intake door for cracks or damage, then go to next step.
No | Install air intake door securely in proper position, then go to next step.
14 | VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER REPAIR • Does malfunction disappear? | Yes | Troubleshooting completed. Explain repairs to customer.
No | Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.