Mazda MX-6 1998, Workshop Manual

Page: 915 / 1282

TROUBLESHOOTING
STEP INSPECTION
ACTION
4* Turn ignition switch to LOCK.
Disconnect heater control unit 10-pin and
14-pin connectors.
Check if there is continuity between the
following terminals.
• Terminal 1C (14-pin, heater control unit) -
terminal H (airflow mode actuator)
• Terminal 1N (14-pin, heater control unit) -
terminal F (airflow mode actuator)
• Terminal 1 0 (14-pin, heater control unit) -
terminal A (airflow mode actuator)
• Terminal 1M (14-pin, heater control unit) -
terminal I (airflow mode actuator)
• Terminal 1L (14-pin, heater control unit) -
terminal G (airflow mode actuator)
• Terminal 1K (14-pln, heater control unit) -
terminal C (airflow mode actuator)
• Terminal 1A (14-pin, heater control unit) -
terminal J (airflow mode actuator)
• Terminal 2H (10-pin, heater control unit) -
terminal D (airflow mode actuator)
• Terminal 21 (10-pin, heater control unit) -
terminal B (airflow mode actuator)
Are there continuities?
1 0 1 M 1 K
> r <
1 E 1 C 1 A
* 1 N
1L 1 J 1 1 H
1 F
1 D
1 B
H E A T E R C O N T R O L U N I T
1 4 - P I N C O N N E C T O R
2 K 2 I
> < m 2 A
2 L 2 J 2 H Ì 2 F 2 D 2 B
I
G
X
C A
J
H F
D
B
H E A T E R C O N T R O L U N I T
1 0 - P I N C O N N E C T O R
A I R F L O W M O D E
A C T U A T O R C O N N E C T O R
W 6 U 7 0 1 W A T
Check if there is no continuity between the
above terminals and ground.
Are there no continuities?
Yes Go to next step.
No Repair wiring harness between heater control unit and
airflow mode actuator, then go to step 6.
Inspect heater unit’s doors.
• Is door free of obstructions, cracks, and
damage?
• Are doors securely and properly installed?
Are above items okay?
Yes
Replace heater control unit, then go to next step.
No Remove obstruction, or install doors in proper position. If
any doors are cracked or damaged, replace them, then go
to next step.
Does airflow mode change when airflow mode
switch is operated?
Yes Troubleshooting completed. Explain repairs to customer.
No Reconfirm malfunction symptoms, then repeat from step 1
if malfunction reoccurs.
0 7 -0 1 -1 6