412-00-23
Climate Control System — General Information
412-00-23
DIAGNOSIS AND TESTING (
CONTINUED
)
CONDITIONS
DETAILS/RESULTS/ACTIONS
C7: CHECK THE GROUND SUPPLY OF THE HEATER BLOWER SWITCH
1
Measure the resistance between heater blower
switch, connector C72, pin 6, circuit 31-CA25
(BK), harness side and ground.
• Is the resistance less than 2 ohms?
Yes
CHECK the heater blower switch; INSTALL
a new one if necessary. TEST the system
for normal operation.
No
REPAIR the open circuit(s) between heater
blower switch and ground by using the wir-
ing diagrams. TEST the system for normal
operation.
C8: CHECK THE CIRCUIT FOR HEATER BLOWER, HIGH SPEED
1
.
2
.
Heater blower
switch C72
3
.
4
Measure the voltage between heater blower
switch, connector C72, pin 4, circuit 31S-CA33
(BK/OG), harness side and ground.
• Is battery voltage indicated?
Yes
GO TO
C9
No
REPAIR the open circuit(s) between heater
blower motor and heater blower switch by
using the wiring diagrams. TEST the system
for normal operation.
C9: CHECK THE CIRCUIT FOR HEATER BLOWER, MEDIUM SPEED
1
Measure the voltage between heater blower
switch, connector C72, pin 1, circuit 31S-CA32
(BK/BU), harness side and ground.
• Is battery voltage indicated?
Yes
No
E9425 EN
07/2001 2002 Bantam