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am3zzw00000862
CLIMATE CONTROL UNIT INSPECTION[FULL-AUTO AIR CONDITIONER (MZ-CD 1.6 (Y6))]
id0740b4802200
1. Turn the ignition switch to the ON position.
2. Connect the negative (-) lead of the tester to body ground.
3. By inserting the positive (+) lead of the tester into each climate control unit terminal, measure the voltage according to the terminal voltage table.
Terminal Voltage Table (Reference)
am3zzw00000862
|
|
Terminal |
Signal name |
Connected to |
Measurement condition |
Voltage (V) |
Inspection item (s) |
|---|---|---|---|---|---|
|
A
|
TNS signal
|
PJB
|
Headlight switch OFF
|
1.0 or less
|
• Wiring harness: short circuit (Climate control unit—PJB: A—J-03 H)
• Panel light control switch
• Headlight switch
|
|
Headlight switch ON
|
B+
|
• Wiring harness: continuity, short circuit (Climate control unit—PJB: A—J-03 H)
• Panel light control switch
• Headlight switch
|
|||
|
B
|
TNS signal
|
Panel light control switch
|
Headlight switch ON and panel light control switch at max. illumination
|
1.0 or less
|
• Wiring harness: continuity (Climate control unit—panel light control switch: B—F)
• Panel light control switch
• Climate control unit: terminal voltage (A)
|
|
Headlight switch ON and panel light control switch at min. illumination
|
12
|
• Wiring harness: short circuit (Climate control unit—panel light control switch: B—F)
|
|||
|
C
|
Motor operation
|
Air mix actuator
|
Moving towards COLD
|
12
|
• Wiring harness: continuity, short circuit (Climate control unit—air mix actuator: C—D, E—F)
• Air mix actuator
|
|
Moving towards HOT
|
1.0 or less
|
||||
|
D
|
Blower fan speed control
|
Power MOS FET
|
Fan stopped
|
1.0 or less
|
• Climate control unit: terminal voltage (F)
|
|
Fan: manual LO
|
2.9
|
||||
|
Fan: manual HI
|
9.7
|
||||
|
E
|
Motor operation
|
Air mix actuator
|
Moving towards COLD
|
1.0 or less
|
• Wiring harness: continuity, short circuit (Climate control unit—air mix actuator: E—F, C—D)
• Air mix actuator
|
|
Moving towards HOT
|
12
|
||||
|
F
|
Blower motor feedback
|
• Blower motor
• Power MOS FET
|
Fan stopped
|
B+
|
1. Wiring harness: continuity, short circuit (Climate control unit—blower motor: F—B) (Climate control unit—power MOS FET: F—B, D—C) (Blower motor—blower relay: A—E) (Blower relay—fuse: A—HEATER 40 A, B—A/C 10 A)
2. Wiring harness: continuity (Power MOS FET—body ground: A—GND) (Blower relay—body ground: D—GND)
3. Power MOS FET
4. Blower motor
5. Blower relay
6. A/C 10 A fuse
7. HEATER 40 A fuse
8. Power MOS FET replacement
|
|
Fan: manual LO
|
9.8
|
||||
|
Fan: manual HI
|
0.5
|
||||
|
G
|
Motor operation
|
Airflow mode actuator
|
Switched to DEFROSTER
|
12
|
• Wiring harness: continuity, short circuit (Climate control unit—airflow mode actuator: G—D, I—F)
• Airflow mode actuator
|
|
Switched to VENT
|
1.0 or less
|
||||
|
H
|
—
|
—
|
—
|
—
|
—
|
|
I
|
Motor operation
|
Airflow mode actuator
|
Switched to DEFROSTER
|
1.0 or less
|
• Wiring harness: continuity, short circuit (Climate control unit—airflow mode actuator: G—D, I—F)
• Airflow mode actuator
|
|
Switched to VENT
|
12
|
||||
|
J
|
B+
|
ROOM 15 A fuse
|
Under any condition
|
B+
|
• Wiring harness: continuity, short circuit (Climate control unit— fuse: J—ROOM 15 A)
• ROOM 15 A fuse
|
|
K
|
IG2
|
A/C 10 A fuse
|
IG SW ON
|
B+
|
• Wiring harness: continuity, short circuit (Climate control unit— fuse: K—A/C 10 A)
• A/C 10 A fuse
|
|
IG SW LOCK
|
1.0 or less
|
• Wiring harness: continuity, short circuit (Climate control unit— fuse: K—A/C 10 A)
|
|||
|
L
|
Potentiometer input
|
Airflow mode actuator
|
VENT
|
4.5
|
• Wiring harness: continuity, short circuit (Climate control unit—airflow mode actuator: L—C)
• Airflow mode actuator
• Climate control unit: terminal voltage (P)
|
|
BI-LEVEL
|
3.7
|
||||
|
HEAT
|
2.9
|
||||
|
HEAT/DEF
|
1.9
|
||||
|
DEFROSTER
|
0.8
|
||||
|
M
|
Motor operation
|
Air intake actuator
|
Switched to RECIRCULATE
|
1.0 or less
|
• Wiring harness: continuity, short circuit (Climate control unit—air intake actuator: M—G, O—E, Q—C)
• Air intake actuator
|
|
Switched to FRESH
|
12
|
||||
|
N
|
Potentiometer input
|
Air mix actuator
|
Set temperature at MAX COLD
|
0.8
|
• Wiring harness: continuity, short circuit (Climate control unit—air mix actuator: N—C)
• Air mix actuator
• Climate control unit: terminal voltage (P)
|
|
Set temperature at MAX HOT
|
4.5
|
||||
|
O
|
Motor operation
|
Air intake actuator
|
Switched to RECIRCULATE
|
12
|
• Wiring harness: continuity, short circuit (Climate control unit—air intake actuator: M—G, O—E)
• Air intake actuator
|
|
Switched to FRESH
|
1.0 or less
|
||||
|
P
|
+5 V
|
• Air mix actuator
• Airflow mode actuator
• Solar radiation sensor
|
IG SW ON
|
5.2
|
• Wiring harness: short circuit (Climate control unit—air mix actuator, airflow mode actuator, solar radiation sensor: P—A, A, A)
• Air mix actuator
• Airflow mode actuator
• Solar radiation sensor
• Climate control unit: terminal voltage (K, V)
|
|
IG SW LOCK
|
0
|
• Climate control unit replacement
|
|||
|
Q
|
Motor operation
|
Air intake actuator
|
Switched to RECIRCULATE
|
1.0 or less
|
• Wiring harness: continuity, short circuit (Climate control unit—air intake actuator: Q—C, M—G)
• Air intake actuator
|
|
Switched to FRESH
|
12
|
||||
|
R
|
Cabin temperature sensor input
|
Cabin temperature sensor
|
Compared with temperature detected by cabin temperature sensor
|
Refer to graph 1
|
• Wiring harness: continuity (Climate control unit—cabin temperature sensor: R—D, U—B)
• Wiring harness: short circuit (Climate control unit—cabin temperature sensor: R—B)
• Cabin temperature sensor
• Climate control unit: terminal voltage (K, V)
|
|
S
|
Solar radiation sensor input
|
Solar radiation sensor
|
Incandescent light (approx. 60 W) shined directly on the solar radiation sensor from a distance of approx. 100 mm {3.9 in}
|
4.0
|
• Wiring harness: continuity (Climate control unit—solar radiation sensor: S—B, P—A)
• Climate control unit: terminal voltage (P)
• Solar radiation sensor
|
|
Blocking light to solar radiation sensor
|
1.0 or less
|
||||
|
T
|
—
|
—
|
—
|
—
|
—
|
|
U
|
Sensor GND
|
• Cabin temperature sensor
• Air mix actuator
• Airflow mode actuator
|
Under any condition
|
1.0 or less
|
• Climate control unit: terminal voltage (V)
|
|
V
|
GND
|
Body ground
|
Under any condition
|
1.0 or less
|
• Wiring harness: continuity (Climate control unit—GND: V—GND)
|
|
W
|
Signal
|
—
|
—
|
—
|
—
|
|
X
|
Signal
|
—
|
—
|
—
|
—
|
 |
—
|