Inspection Of Hvac Control Module And Its Circuit - Suzuki SX4 Service Manual

Inspection of HVAC Control Module and Its Circuit

HVAC control module and its circuits can be checked at HVAC control module wiring couplers by measuring voltage.
CAUTION
!
HVAC control module can not be checked by itself. It is strictly prohibited to connect voltmeter to
HVAC control module with couplers disconnected from it.
Voltage Check
1) Remove HVAC control module referring to "HVAC Control Module Removal and Installation: Automatic Type".
2) Check voltage at each terminal.
NOTE
As each terminal voltage is affected by the battery voltage, confirm that it is 11 V or more when ignition
switch is ON.
1. HVAC control module
Terminal Wire Color
Temperature control
G20-1 GRY/BLU
actuator (COOL)
Temperature control
G20-2 GRY/RED
actuator (HOT)
Serial communication line
G20-3 BLU
of data link connector
G20-4 GRN/YEL Rear defogger switch
G20-5 BLK/YEL Illumination ground
G20-6 RED/YEL Illumination switch
Electric power source for
G20-7 WHT/RED
back-up
1
14 13 12
30 29 28
2. HVAC control module connector (viewed from harness side)
Normal
Circuit
Voltage
10 – 14 V
0 – 2 V
10 – 14 V
0 – 2 V
10 – 14 V
Refer to "Reference waveform No. 1: Automatic Type".
0 – 1 V
0 – 1 V
10 – 14 V
10 – 14 V
Air Conditioning System: Automatic Type 7B-73
G20
11 10 9 8 7
27 26 25 24 23 22 21
Ignition switch turned ON, temperature control
actuator is working in operation from HOT to COOL
position
Ignition switch turned ON, except the above
condition
Ignition switch turned ON, temperature control
actuator is working in operation from COOL to HOT
position
Ignition switch turned ON, except the above
condition
Ignition switch turned ON
Full-time
Ignition switch turned ON, lighting switch OFF
position
Ignition switch turned ON, lighting switch ON position
Constantly
S7RW0A7224029
2
6 5 4 3 2 1
20 19 18 17 16 15
I7RW01722013-01
Condition