Suzuki Liana RH413, Service Manual

Page: 829 / 1302

Heater and Ventilation: 7A-11
Inspection of HVAC Control Module and its Circuit
S3RH0A7104014
HVAC control module and its circuits can be checked at HVAC control module wiring coupler 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 as shown below.
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
2
2 1 4 3 6 5
10 11 12 13 14
30 28 27 26 25 24 23 22 21 20 19 18 17 16 15 29
9 8 7
I3RH0A710008-01
1. HVAC control module 2. HVAC control module connector “G77” (viewed from harness side)
Terminal Wire Color Circuit
Normal
Voltage
Condition
G77-1 — — — —
G77-2 BLU/BLK
Electric load signal for
blower motor
10.0 – 14.0V
Ignition switch ON, Blower speed selector OFF, 1st
or 2nd position.
about 2.0V
Ignition switch ON, Blower speed selector between
3rd and HIGH position
G77-3 PPL/WHT Rear defogger relay
10.0 – 14.0 V Rear defogger switch OFF position
0 – 0.5 V Rear defogger switch ON position
G77-4 — — — —
G77-5 BLU/YEL Blower motor controller
about 0.0 V Ignition switch ON, Blower speed selector OFF
2.0 – 3.0V
Ignition switch ON, Blower speed selector between
LOW and HIGH position
G77-6 BLU/WHT
Blower motor control
voltage feedback
10.0 – 14.0 V Ignition switch ON, Blower speed selector OFF
about 8.0 V
Ignition switch ON, Blower speed selector 1st
position
about 6.5 V
Ignition switch ON, Blower speed selector 2nd
position
about 5.5 V
Ignition switch ON, Blower speed selector 3rd
position
about 4.8 V
Ignition switch ON, Blower speed selector 4th
position
about 3.8 V
Ignition switch ON, Blower speed selector 5th
position
about 3.0 V
Ignition switch ON, Blower speed selector 6th
position
about 2.0 V
Ignition switch ON, Blower speed selector 7th
position
about 1.0 V
Ignition switch ON, Blower speed selector HIGH
position