Suzuki 2006 SX4, Service Manual

Page: 941 / 1478

Air Conditioning System: Automatic Type 7B-76
Inspection of HVAC Control Module and Its Circuit
S6RW0C7224029
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”.
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.
G20
1 2 3 4 5 6 7 8 9 10 11 12 13 14
15 16 17 18 19 20 21 24 23 22 25 26 27 28 29 30
1
2
I7RW01722013-01
1. HVAC control module 2. HVAC control module connector (viewed from harness side)
Terminal Wire Color Circuit
Normal
Voltage
Condition
G20-1 GRY/BLU
Temperature control
actuator (COOL)
10 – 14 V
Ignition switch turned ON, temperature control
actuator is working in operation from HOT to COOL
position
0 – 2 V
Ignition switch turned ON, except the above
condition
G20-2 GRY/RED
Temperature control
actuator (HOT)
10 – 14 V
Ignition switch turned ON, temperature control
actuator is working in operation from COOL to HOT
position
0 – 2 V
Ignition switch turned ON, except the above
condition
G20-3 BLU
Serial communication line
of data link connector
10 – 14 V Ignition switch turned ON
G20-4 GRN/YEL Rear defogger switch Refer to “Reference waveform No. 1: Automatic Type”.
G20-5 BLK/YEL Illumination ground 0 – 1 V Full-time
G20-6 RED/YEL Illumination switch
0 – 1 V
Ignition switch turned ON, lighting switch OFF
position
10 – 14 V Ignition switch turned ON, lighting switch ON position
G20-7 WHT/RED
Electric power source for
back-up
10 – 14 V Constantly