FULL-AUTOMATIC AIR CONDITIONER – Troubleshooting55-55
Terminal
No.Normal condition Check condition Check item
4Heater water temperature sensor
inputWhen sensor section temperature is
25C (4 kΩ)2.3 – 2.9 V
5Air mix damper potentiometer inputWhen damper is moved to MAX. HOT
position4.7 – 5.0 V
6Air outlet changeover damper poten-
tiometer inputWhen damper is moved to DEF.
position4.8 – 5.2 V
7Outside air temperature sensor inputWhen sensor section temperature is
25C (4 kΩ)2.3 – 2.9 V
8Air thermo sensor inputWhen sensor section temperature is
25C (4 kΩ)2.3 – 2.9 V
9Photo sensor (–)At luminous intensity of 0 lux0 V
At luminous intensity of 100,000 lux or
more–0.1 – 0.2 V
10Sensor power supplyAt all times4.8 – 5.2 V
12Blower motor HI relay (Exciting circuit)When blower switch is in HI1.5 V or less
When blower switch is in a position
other than HISystem voltage
16Rear defoggerWhen rear defogger switch is ON1.5 V or less
When rear defogger switch is OFFSystem voltage
17Diagnosis date outputWhen ignition switch is ON0 V ↔ 12 V
18Diagnosis control outputWhen ignition switch is ONSystem voltage – 2 V
19Photo sensor (+)At all times0 V
20Sensor earthAt all times0 V
21Air outlet changeover damper motor
(FACE)When damper is moved to FACE
position10 V
When damper is moved to DEF.
positionAlmost no voltage
(0.5 V)
22Air mix damper motor (MAX. COOL)When damper is moved to MAX.
COOL position10 V
When damper is moved to MAX. HOT
positionAlmost no voltage
(0.5 V)
23Inside/outside air changeover damper
motor (Inside)When switch is set to inside air
positionAlmost no voltage
(0.5 V)
When switch is set to outside air
position10 V
24Air outlet changeover damper motor
(DEF.)When damper is moved to FACE
positionAlmost no voltage
(0.5 V)
When damper is moved to DEF.
position10 V
FULL-AUTOMATIC AIR CONDITIONER –
Troubleshooting /
On-vehicle Service55-56
Terminal
No.Normal condition Check condition Check item
25Air mix damper motor (MAX. HOT)When damper is moved to MAX.
COOL positionAlmost no voltage
(0.5 V)
When damper is moved to MAX. HOT
position10 V
26Inside/outside air changeover damper
motor (Outside)When switch is set to inside air
position10 V
When switch is set to outside air
positionAlmost no voltage
(0.5 V)
28IG2 power supplyWhen ignition switch is ONSystem voltage
29EarthAt all timesContinuity
30ILL power supplyWhen lighting switch is at ONSystem voltage
34A/C outputWhen A/C is OFF0 V
When A/C is ONSystem voltage
35EarthAt all timesContinuity
ON-VEHICLE SERVICE
REFRIGERANT CHARGING, LEVEL CHECK,
ADDITION AND REMOVAL, PERFORMANCE
TEST, DUAL PRESSURE SWITCH SIMPLE
CHECK
Follow the same procedures as for the heater and manual
air conditioner. (Refer to P.55-6.)
