FRONT CLIMATE CONTROL UNIT INSPECTION

BME074061190W04

1. Slide out the front climate control unit with the connectors still connected.

2. Turn the ignition switch to ON position.

3. Measure the voltage at each front climate control unit terminal and refer to the terminal voltage list.

4. Disconnect the front climate control unit connector before inspecting for continuity at terminal D.

• If not as specified, inspect the parts listed under "Action" and the related wiring harnesses.
• If the parts and wiring harnesses are okay but the system still does not work properly, replace the front climate control unit.

Terminal Voltage Table (Reference)

Terminal

Signal

Connected to

Test condition

Voltage (V)/Continuity

Action

A
Power supply
ROOM 10 A fuse
Under any condition
B+
• Inspect ROOM 10 A fuse
• Inspect related harness
B
IG2
A/C 10 A fuse
IG SW at ON position
B+
• Inspect A/C 10 A fuse
• Inspect related harness
IG SW at LOCK position
0
C
FRESH
Front air intake actuator
Air intake mode at FRESH
0
• Inspect front air intake actuator
• Inspect for continuity or short circuit (Front climate control unit-Front air intake actuator: C-C, E-A)
Air intake mode at RECIRCULATE
B+
D
GND
GND
Under any condition: Inspect for continuity to ground
Yes
• Inspect related harness
E
RECIRCULATE
Front air intake actuator
Air intake mode at RECIRCULATE
0
• Inspect front air intake actuator
• Inspect for continuity or short circuit (Front climate control unit-Front air intake actuator: E-A, C-C)
Air intake mode at FRESH
B+
F
Fan SW
• Front fan SW
• Front resistor
Front fan SW
Off
B+
• Inspect front fan SW
• Inspect front resistor
• Inspect for continuity or short circuit (Front climate control unit-Front fan switch: F-A) (Front climate control unit-Front resistor: F-D)
1st position
0.1
2nd position
0.3
3rd position
0.5
4th position
0.4
H
Rear window defroster SW
Instrument cluster
Rear window defroster SW on
0
• Inspect instrument cluster
• Inspect for continuity or short circuit (Front climate control unit-Instrument cluster: H-3R)
Rear window defroster SW off
B+
I
A/C
Thermometer
Front fan SW and A/C SW off
B+
• Inspect thermosensor
• Inspect for continuity or short circuit (Front climate control unit-Thermosensor: I-B)
Front fan SW and A/C SW on
0
J
Rear window defroster indicator
Instrument cluster
Rear window defroster on
0
• Inspect instrument cluster
• Inspect for continuity or short circuit (Front climate control unit-Instrument cluster: J-3N)
Rear window defroster off
B+
K
Panel light control
Panel light control SW
Inspect terminal C of panel light control SW
-
• Inspect panel light control switch
• Inspect for continuity or short circuit (Front climate control unit-Panel light control switch: K-C)
L
TNS
TNS relay
Headlight SW at TNS position
B+
• Inspect TNS relay
• Inspect for continuity or short circuit (Front climate control unit-TNS relay: L-D)
Headlight SW at OFF position
0