Suzuki GA413 Service Manual page 49

Symptom
Heater blower won't work
even when its switch is ON.
Incorrect temperature output
WIRING CIRCUIT
1. Battery
2. Main fuse
3. Ignition switch
4. J/B
5. Heater blower switch
6. Heater resistor
7. Blower motor
8. ECM
9. Combination switch
DIAGNOSIS
Possible Cause
Blower fuse blown
Blower resistor faulty
Blower motor faulty
Wiring or grounding faulty
Control cables broken or binding
Air damper broken
Air ducts clogged
Heater core leaking or clogged
Heater hoses leaking or clogged
ON-VEHICLE SERVICE
B :Black
Lg :Light green
P :Pink
P/B :Pink/Black
P/Bl :Pink/Blue
P/G :Pink/Green
HEATER AND VENTILATION 1A-3
Remedy
Replace fuse to check for short.
Check continuity.
Replace motor.
Repair as necessary.
Check cables.
Repair damper.
Repair air ducts.
Replace heater core.
Replace hoses.