NO.5 WINDSHIELD FOGGED

id070300801900

5 | Windshield fogged.
DESCRIPTION | • Malfunction in A/C compressor control system and/or air intake mode switching system • A/C compressor does not operate while airflow mode is 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 | • Front climate control unit (B+ signal) system malfunction • Air intake actuator malfunction • Front climate control unit (RECIRCULATE, FRESH signal) system malfunction • A/C unit air intake door malfunction

• 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, inspect 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 the A/C and fan switch in the front climate control unit are on, does cool air blow out from the front vent? | Yes | Go to the next step.
No | Go to Step 1 of troubleshooting index No.8.
2 | INSPECT FRONT CLIMATE CONTROL UNIT POWER SUPPLY FUSE FOR B+ SIGNAL • Is the front climate control unit power supply fuse for B+ signal normal? | Yes | Go to the next step.
No | Inspect for a short to ground on blown fuse circuit. • Repair or replace if necessary. Install appropriate amperage fuse.
3 | INSPECT AIR INTAKE ACTUATOR • Inspect the air intake actuator for followings. ― Is there grease on the link? ― Is the link securely and properly positioned? ― Is the link free of obstructions? • Are the above items normal? | Yes | Go to the next step.
No | Apply grease or install the link properly and securely, remove obstruction, then go to Step 14.
*4 | INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND FRONT CLIMATE CONTROL UNIT FOR CONTINUITY • Disconnect the front climate control unit connector (24-pin). • Turn the ignition switch to the ON position. • Measure the voltage at front climate control unit terminal 1B (B+ signal). • Is the voltage approx. 12 V? | Yes | Go to the next step.
No | Repair the wiring harness between the fuse block and front climate control unit, then go to Step 14.
*5 | INSPECT WIRING HARNESS BETWEEN FRONT CLIMATE CONTROL UNIT AND GROUND FOR VOLTAGE • Measure the voltage at front climate control unit terminal 1X (Ground). • Is the voltage approx. 0V? | Yes | Go to the next step.
No | Repair the wiring harness between the front climate control unit and ground, then go to Step 14.
6 | VERIFY WHETHER MALFUNCTION IS IN A/C UNIT AIR INTAKE DOOR OR ELSEWHERE • Turn the ignition switch to the OFF position. • Connect the climate control unit connector (24-pin). • Remove the air intake actuator. • Turn the ignition switch to the ON position. • Set the fan switch to 4th position. • Does the air intake mode (RECIRCULATE, FRESH) change smoothly when the air intake link is operated by hand? | Yes | Go to the next step.
No | Go to Step 12.
7 | INSPECT AIR INTAKE ACTUATOR • Inspect the air intake actuator. (See AIR INTAKE ACTUATOR INSPECTION.) • Is it normal? | Yes | Go to the next step.
No | Replace the air intake actuator, go to Step 14.
8 | INSPECT AIR INTAKE SELECTOR SWITCH AND DEFROSTER SWITCH IN FRONT CLIMATE CONTROL UNIT • Measure the voltage at front climate control unit connector (24-pin) terminals 1K and 1M. • Is it normal? | Yes | Go to the next step.
No | Replace the front climate control unit, then go to Step 14.
*9 | INSPECT WIRING HARNESS BETWEEN FRONT CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR FOR CONTINUITY • Turn the ignition switch to the OFF position. • Is there continuity between the following front climate control unit terminals and air intake actuator terminals? R.H.D. ― Terminal A —Terminal 1K (RECIRCULATE signal) ― Terminal C —Terminal 1M (FRESH signal) L.H.D. ― Terminal A —Terminal 1K (FRESH signal) ― Terminal C —Terminal 1M (RECIRCULATE signal) | Yes | Go to the next step.
No | Repair the wiring harness between the front climate control unit and air intake actuator, then go to Step 14.
*10 | INSPECT WIRING HARNESS BETWEEN FRONT CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR FOR SHORT TO GROUND • Is there continuity between the following front climate control unit terminals and ground? R.H.D. ― Terminal 1K (RECIRCULATE signal) ― Terminal 1M (FRESH signal) L.H.D. ― Terminal 1M (RECIRCULATE signal) ― Terminal 1K (FRESH signal) | Yes | Repair the wiring harness between the front climate control unit and air intake actuator, then go to Step 14.
No | Go to the next step.
*11 | INSPECT WIRING HARNESS BETWEEN FRONT CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR FOR SHORT TO B+ • Turn the ignition switch to the ON position. • Measure the voltage at the following front climate control unit terminals. R.H.D. ― Terminal 1K (RECIRCULATE signal) ― Terminal 1M (FRESH signal) L.H.D. ― Terminal 1M (RECIRCULATE signal) ― Terminal 1K (FRESH signal) • Is the voltage approx. 12 V? | Yes | Repair the wiring harness between the front climate control unit and air intake actuator, then go to Step 14.
No | Replace the front climate control unit, then go to Step 14.
12 | INSPECT A/C UNIT AIR INTAKE DOOR • Is there any foreign material or obstruction in the A/C unit air intake door? | Yes | Remove obstruction, then go to Step 14.
No | Go to the next step.
13 | VERIFY THAT A/C UNIT AIR INTAKE DOOR IS POSITIONED SECURELY AND PROPERLY • Is the A/C unit air intake door securely and properly positioned? | Yes | Inspect the air intake door for cracks or damage, then go to the next step.
No | Install the air intake door securely in the proper position, then go to the next step.
14 | VERFY REPAIR • Does the malfunction disappear? | Yes | Troubleshooting completed. Explain repairs to customer.
No | Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.