Page 1302 - Workshop Manual - Aumark (BJ1051)

61-30
Circuit-System circuit diagram

AC runs state
AC starts to run when AC switch is at closed position and the blower switch is at LO position
· Running state of blower
Current goes through electromagnetic coil of heater relay R13 to the pin No. 12 of blower switch; to the pin No. 9
of blower switch to ground through blower switch; electromagnetic coil generates magnetic field and contact of
relay R13 closes; current goes through the contact of heater relay R13 to the pin No. 1 of blower; to pin No. 2 of
blower and pin No. 9 of speed regulating resistor through blower motor; to pin No. 4 of speed regulating resistor
and pin No. 12 of blower switch through speed regulating resistor; to pin No. 9 of blower to ground through
blower switch, and the blower starts to run at low speed.
Current goes through blower motor to pin No. 2 of blower and pin No. 1 of speed regulating resistor when blower
switch is at M1 position; to pin No. 2 of speed regulating resistor and pin No. 1 of blower switch through speed
regulating resistor; to pin No. 9 of blower to ground through blower switch.
Current goes through blower motor to the pin No. 2 of blower and pin No. 1 of speed regulating resistor when
blower switch is at M2 position; to pin No. 3 of speed regulating resistor and pin No. 8 of blower switch through
speed regulating resistor; to pin No. 9 of blower to ground through blower switch.
Current goes through blower motor to pin No. 2 of blower and pin No. 11 of blower switch when blower switch is
at HI position; to pin No. 9 of blower to ground through blower switch.
· Compressor runs state
From pin No. 11 of signal amplifier to pin No. 5 of AC switch; through AC switch to pin No. 6 of AC switch and
pin No. 12 of blower switch; to pin No. 9 of blower through blower switch; signal amplifier confirms the running
signal of AC and controls the electromagnetic coil of the electromagnetic clutch relay R15 to ground through pin
No. 7 of signal amplifier; electromagnetic coil generates magnetic field and contacts of relay R15 is closed; current
goes through the contacts of electromagnetic clutch relay R15 to the pin No. 27 of engine control unit; and engine
control unit will control the electromagnetic coil of AC main relay R36 after it receives the signal; engine control
unit is grounding and electromagnetic coil generates magnetic field; contacts of relay R36 close and current goes
through the contact of AC main relay R36 to the pin No. 1 of compressor electromagnetic clutch; to the external
housing to ground through the electromagnetic coil of clutch; compressor starts to run.
AC pressure switch will be at disconnection state when there is abnormal of high voltage or low voltage inside of
AC system; electromagnetic clutch relay R15 will be failed and compressor stops running.
· Condenser fan runs state
Current goes through the contacts of AC main relay R36 to electromagnetic oil of speed regulating relay R17 of
condenser to ground when compressor is at working state; electromagnetic coil is electrified to produce magnetic
field; contacts of speed regulating relay R17 of condenser close and current goes through the contacts of speed
regulating relay R17 of condenser to pin No. 1 of condenser fan; to pin No. 2 of condenser fan to ground through
inside resistor; condenser fan starts to ran at low speed.
Electromagnetic oil of condenser relay R16 will fail when middle voltage switch is turned on; contacts of
condenser relay R16 will return (30 and 87a is connected); pin No. 4 of condenser fan is grounded through the
contact of condenser relay R16; condenser fan starts to ran at high speed.

:Part position

Reference wire Reference wire Reference wire
S/N S/N S/N
harness harness harness
B001 Body wire B042 Body wire C003 Chassis wire

B005 Body wire B043 Body wire C006 Chassis wire
B007 Body wire B050 Body wire C033 Chassis wire
B008 Body wire C002 Chassis wire C051 Chassis wire
61
: position of the insert part
S/N S/N Reference wire harness (position of the insert parts)
B103 C101 Body wire and chassis wire (middle of the first cross member of frame)
B105 C105 Body wire and chassis wire (middle of the first cross member of frame)
C103 B107 Body wire and chassis wire (middle of the first cross member of frame)

Page 1302