Page
31 of 39
Number
SM001-300
HVAC: Idle Management System
Table 5.
Control Module Pinout with Functional Information
Pin
Circuit ID
Wire Color
Function
Typical Voltage
Other End of Circuit
C1
CONTROL_F
USED
Red/White
12V power from F1 -
10Amp fuse
12-14V
Control fuse F1 and control pin 1
C2
GND
Black
Ground for controls
0V
Black harness connector /
various internal grounds
C3
HTR_OPTIO
N
Red
Indicates if Espar FOH is
connected
12V if Espar FOH
connected, 0V otherwise
Fuel Operated Heater
C4
ACC
White
Possible future feature
Not used
C5
CANH
Yellow
J1939 Can bus HI
2.5V bus with "pulsing"
Yellow wire (pin 4) in connector
on back of control
C6
CANL
Green
J1939 Can bus LO
2.5V bus with "pulsing"
Green wire (pin 3) in connector
on back of control
C7
COND_FAN_
SIG
White
PWM ground switched
output to control
condenser fan speed
0V fan off, 1.6-2.6V
cooling mode
Condenser fan (3 way
connector)
C8
C9
C10
C11
C12
C13
BLWR_CTL
Blue
PWM ground switched
output to control blower
speed
5.6V speed 1, 4.9V speed
2, 3.1V speed 3
Linear Power Module
C14
C15
HEATER_EN
Yellow
12V output to enable FOH
operation
11-14V in heat mode and
parking brake engaged
Fuel Operated Heater
C16
D1
PRESS_IN
Orange
Pressure switch input
11-14V if open and unit
on, <1V if switch closed
or unit off
High pressure switch
D2
IGNITION
White
Prevent or Allow unit
operation (12V = unit
off)
12V if key is in ignition
position, 0V otherwise
Vehicle's Key Ignition circuit
D3
EVAP_TEM
P
Green
0-5V input from
evaporator temperature
sensor
5V with sensor open or
unplugged, 1V-2.5V
with sensor plugged in
Evaporator temperature
sensor - inside unit
D4
D5
SENSOR_G
ND
Black
Ground from control
module for sensors,
pressure switch
Ground
Temperature sensor, high
pressure switch