you have a short to
ground.
8. Check datalink for
any customer
installed equipment
and ensure it was
installed properly.
Refer to Body
Builder Electrical
Guide Here General
Electrical section for
proper installation
information.
J1939BB_Rcv_61217_058_033_Timer

N/A

2058

14

Rear HVAC
Data Link
Communication
Failure

Body Builder Datalink
Connecting Body
Controller circuit
failure, Rear HVAC
Controller Not Powered
Up or Defective.
1. Load Test Power
and Ground to Rear
HVAC Controller. At
Rear HVAC
Controller 5210
Connector Test Pin
3 to known good
ground should be
12V and test pin 3
to pin 4 should be
12V.
2. Check datalink
voltage and
resistance at the
Body
Controller connector

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IK1900207 ­ 2010 and Later ProStar and LoneStar HVAC Diagnostic Information

3.

4.

5.

6.

7.

Page 6 of 9

1602 with a break
out box on pins F5
and F6.
You should have
approximately 5V
total when you add
the voltages from
each wire together.
If out of spec
unplug the rear
HVAC controller
and retest - If back
in spec replace the
rear HVAC
controller.
The CAN High
(Yellow) should
have a higher
voltage than the
CAN Low (Green).
The voltage on the
wires should not
match. If they do
you might have the
2 wires shorted
together.
Check the
resistance between
the 2 wires with key
off (it may be
necessary to
disconnect the
batteries to ensure
there is no voltage
on the datalink. You
should have
approximately 60
ohms with there
being 2 120 ohm
resistors wired in
parallel on the
datalink. If you have
0 ohms indicating
low resistance you
have a short
between the 2
wires. If you get 120
ohms you have a
open somewhere in
the datalink or you
are missing one of
the resistors.
Check resistance
from pin F5 and F6
to Ground.
Resistance should
be greater than
1,000 ohms. If
resistance is less
than 1,000 ohms

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IK1900207 ­ 2010 and Later ProStar and LoneStar HVAC Diagnostic Information

Page 7 of 9

you have a short to
ground.
8. Check datalink for
any customer
installed equipment
and ensure it was
installed properly.
Refer to Body
Builder Electrical
Guide Here General
Electrical section for
proper installation
information

Rear_HVAC_Blower_UP

Rear_HVAC_Temp_UP

HVAC Control Head Multiple Motor
Faults

N/A

N/A

N/A

3982

3983

520465

2

HVAC Rear
Blower Speed
Control Switch
Error

Faulty Switch Actuator
or Micro switch for
HVAC Rear Blower
Speed Control Switch

2

Rear HVAC
Temperature
Control Switch
Error

Faulty Switch Actuator
or Micro switch for Rear
HVAC Temperature
Control Switch

2

HVAC Control
Head Multiple
Motor Faults

HVAC Motor in Wrong
Position or Jammed
(HVAC Control Head
Multiple Motor fault
DM1)

Programmable Parameters
Below is the list of programmable parameters that control the operation of the HVAC system.
These are how the parameters are set from the factory for proper operation.
Parameter
ID

2562

Parameter

HVAC_Compressor_HP_OFF_Time

Value

9

Units

Description

Seconds

When AC Head pressure is
above 400 psi, the
compressor is cycled OFF for
9 seconds and ON for 1
second. This parameter is the
OFF time
During high pressure mode
the AC Compressor is cycled
OFF and ON. This parameter
sets how long the compressor
is ON

2561

HVAC_Compressor_HP_ON_Time

1

Seconds

2563

HVAC_Emergency_Shutdown_Pressure

420

PSI

Maximum AC Head Pressure
allowed before emergency
compressor shutdown. There
is a relief value that will
release the coolant into the
atmosphere if the head

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IK1900207 ­ 2010 and Later ProStar and LoneStar HVAC Diagnostic Information

Page 8 of 9

pressure exceeds 500 - 530
psi. This value should be
somewhat less than that
(arbitrarily chose 480 psi)
Value will be typically the
same as parameter
'HVAC_Pressure_Over_Limit'
2551

HVAC_Freeze_Probe_High_Limit

505

A2Dcounts

High limit for Freeze Probe to
allow Compressor to operate

2542

HVAC_Freeze_Probe_Low_Limit

511

A2Dcounts

Low limit for Freeze Probe to
allow Compressor to operate

Seconds

When leaving High Pressure
Mode, this is the maximum
amount of time we can wait
for the pressure to drop below
300 psi before going to
Normal Operation
(Compressor ON) Mode

2576

HVAC_Leave_HiPressureMode_Timeout

15

2548

HVAC_Max_Initial_Pressure

218

PSI

Maximum head pressure
allowable when turning the
compressor ON. (Transition
from Compressor OFF to
Normal Operation Mode)

2546

HVAC_Pressure_High_Limit

350

PSI

Maximum pressure where
HVAC Compressor can
operate

2556

HVAC_Pressure_Low_Limit

35

PSI

Low limit allowed to turn On
Compressor

A/C High Pressure Transducer Electrical Fault / Signal Table
This table outlines what the A/C pressure transducer signal reads if there is a electrical fault in the
system. The pressure readings may vary slightly.
Signal

B/C
Pin

Description

DLB Reading

AC_High_Side_Pressure

1600
-B12

Open circuit for air conditioning
high side pressure sensor wiring
on any wire, failed sensor, or short
to ground on the signal wire

6525.8 PSI. No fault code is
generated by this condition

AC_High_Side_Pressure

1600
-B12

Short circuit from air conditioning
high side pressure sensor feed(5
volts) to the sensor signal wire

530 PSI. Fault code 2609 16 HVAC
Pressure Protection is set. Fault
clears at key cycle

AC_High_Side_Pressure

1600
-B12

Short to power(12v) to air
conditioning high side pressure
sensor feed wire

1080 PSI. Fault code 2609 16 HVAC
Pressure Protection is set. Fault
clears at key cycle

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IK1900207 ­ 2010 and Later ProStar and LoneStar HVAC Diagnostic Information

Page 9 of 9

Additional Resources
• IK0800092 - The First Check to make when Troubleshooting any Body Controller or ESC
Issue
• 0000002221 - Heat Ventilation Air Conditioning (HVAC) FOR 2010 ProStar and LoneStar
Models (Revision 1)
• 0000002122 - ProStar®+ and LoneStar® (EPA 10) - Electrical Circuit Diagrams Manual –
Models Built June 14, 2010 and After, Revision 4 (Supersedes S08344 and S08371)
• TSI1900001 - Air Conditioning (A/C) condenser replacement versus flushing
• IK1900156 - A/C HVAC Service Resource Center
• IK1900193 - Post 2010 A/C Pressure Transducer Diagnostics
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