Suzuki GA413, Service Manual

Page: 62 / 1246

A/C CONTROLLER AND ITS CIRCUITS IN-
SPECTION
A/C controller and its circuits can be checked at couplers by mea-
suring voltage with the couplers connected.
VOLTAGE CHECK
1) Remove A/C controller from cooling unit.
2) Connect A/C controller couplers to A/C controller.
3) Check voltage at each terminal with couplers connected and
ignition switch ON.
NOTE:
As each terminal voltage is affected by the battery voltage,
confirm that it is 11V or more when ignition switch is ON.
CAUTION:
A/C controller cannot be checked by itself. It is strictly
prohibited to connect voltmeter or ohmmeter to A/C
controller with couplers disconnected from it.
1. A/C controller
1B-8 AIR CONDITIONING
TERMINAL CIRCUIT NORMAL VOLTAGE CONDITION
A1 Power Source 10 – 14 V Ignition Switch ON
A2 Ground 0 – 1 V Ignition Switch ON
A3
A4 Dual Pressure Switch 0 – 1 V Ignition Switch ON
A5
A6
A7 A/C Switch
0 – 1 V Blower fan Switch ON and A/C Switch ON at Igni-
tion Switch ON (A/C indicator light ON)
A7 A/C Switch
10 – 14 V Blower fan or A/C Switch OFF at Ignition Switch
ON (A/C indicator light OFF)
A8
A9
ECM
Refer to “INSPECTION OF ECM AND ITS CIR-
CUIT” in “ENGINE AND EMISSION CONTROL A9
(A/C cut signal)
CUIT in ENGINE AND EMISSION CONTROL
SYSTEM” Section
A10