Mazda 626 - Windshield Fogged

TROUBLESHOOTING
NO. 1 WINDSHIELD FOGGED
1
Windshield fogged.
DESCRIPTION • Air intake mode does not change when climate control unit is in DEFROSTER mode.
• Climate control unit FRESH indicator light does not illuminate while climate control unit is in
DEFROSTER mode.
POSSIBLE
CAUSE
• Climate control unit (IG2 signal) system malfunction (Steps 1,3)
• Air Intake actuator malfunction (Steps 2, 6)
• Climate control unit (GND signal) system malfunction (Step 4)
• Climate control unit (RECIRCULATE, FRESH signal) system malfunction (Steps 7-10)
Malfunction in blower unit air intake door (Steps 11,12)
Diagnostic procedure
• 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.
STEP INSPECTION
ACTION
1
INSPECT CLIMATE CONTROL UNIT POWER
SUPPLY FUSE
• Is climate control unit power supply fuse okay?
Yes Go to next step.
No Check for a short to ground on blown fuse’s
circuit. Repair or replace as necessary.
Install appropriate amperage fuse.
2
INSPECT AIR INTAKE ACTUATOR LINK AND
CRANK
• Is there grease on the link and crank?
Yes Go to next step.
No
Apply grease, then go to Step 13.
*3 INSPECT WIRING HARNESS BETWEEN FUSE
BLOCK AND CLIMATE CONTROL UNIT FOR
CONTINUITY
• Turn ignition switch to ON position.
• Disconnect climate control unit connector
(7-pin).
• Test voltage at climate control unit connector
(7-pin) terminal E (IG2 signal).
• Is voltage approximately 12 V?
Yes Go to next step.
No
Repair wiring harness between fuse block and
climate control unit, then go to Step 13.
*4
INSPECT WIRING HARNESS BETWEEN
CLIMATE CONTROL UNIT AND GROUND FOR
CONTINUITY
• Turn ignition switch to LOCK position.
• Is there continuity between climate control unit
connector (7-pin) terminal B and ground?
Yes
Reconnect climate control unit connector, then go
to next step.
No
Repair wiring harness between climate control
unit and ground, then go to Step 13.
5 CHECK TO SEE WHETHER MALFUNCTION IS
IN BLOWER UNIT AIR INTAKE DOOR OR
ELSEWHERE
• Remove air intake actuator.
• Turn ignition switch to ON position.
• Set fan control switch at 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 11.
6 INSPECT AIR INTAKE ACTUATOR
• Inspect air intake actuator.
• Is it okay?
Yes
Install air intake actuator, then go to next step.
No
Replace air intake actuator, then go to Step 13.
*7
CHECK TO SEE WHETHER AIR INTAKE
SYSTEM IS CORRECT OR NOT
• Test voltage at following climate control unit
connector (7-pin) terminals G, F.
(See U-14 CLIMATE CONTROL UNIT
INSPECTION)
• Are they okay?
Yes
System is okay.
No Go to next step.
U-18