NHTSA ID Number: 10130869
Manufacturer Communication Number: IK1900198
TSB/Document Date: 2018-04-02
Summary
MaxxPower No Idle Battery-Powered A/C System Diagnostic Guide; models equipped with feature 16UZL
IK1900198 - MaxxPower No Idle Battery-Powered A/C System Diagnostic Guide
Page 1 of 17
Countries:
CANADA, TAIWAN, UNITED STATES, GUAM,
KOREA, SOUTH KOREA
Document
ID:
IK1900198
Availability:
ISIS, FleetISIS, IsSIR
Revision:
17
Major System:
ACCESSORIES
Created:
7/23/2012
Current
Language:
English
Last
Modified:
7/31/2017
Other
Languages:
NONE
Author:
Charles
Schroeder
Viewed:
27128
Less Info
Coding Information
Hide Details
Copy Link
Copy Relative Link
Bookmark
Add to Favorites
Provide Feedback
View My Bookmarks
Helpful
Not Helpful
60
24
Title : MaxxPower No Idle Battery-Powered A/C System Diagnostic Guide
Applies To : Feature code 16UZL
Change Log
Please refer to the change log text box below for recent changes to this article:
07/31/2017 ‐ Made notes in Service Parts Information that the Cold Loop part number applies to ProStar and LoneStar only.
07/31/2017 ‐ Changed menu based on dealer feedback.
12/19/2016 ‐ Updated Diagnostic information section.
10/19/2015 ‐ Author updated for feedback purposes.
10/13/2015 ‐ Added the prerequisite of replacing the complete system replacement is Not Warrantable
10/01/2015 ‐ Updated formatting of SRT table.
Description
Safety Recall 14516 has been issued for units built prior to June 23, 2014.
•
•
•
•
To properly diagnose the system you must ensure the recall has been performed.
Only the "Cold Loop" sealed refrigerant core PN # 2614669C1 is to be replaced when the refrigerant circuit fails.
DO NOT REPLACE THE COMPLETE UNIT IF THE A/C IS NOT FUNCTIONING. Complete unit is not Warrantable
Refer to the BASIC TROUBLESHOOTING below prior to replacing any components. This will help you identify which component is at fault
or any electrical issues.
• Refer to PARTS INFORMATION to properly identify the parts that may require replacement
• The A/C portion of the system is listed below in the parts section.
• The 16UZL No‐Idle HVAC system is designed to disengage when the engine is started, and can be turned on with the key in any position.
This battery‐powered no idle HVAC system provides heating and cooling of the sleeper area without use of the vehicle engine.
• The system is comprised of the no idle HVAC components located in the sleeper HVAC module, a separate fuel operated coolant heater
mounted under the sleeper, and four additional batteries housed in a second battery box.
• The no idle HVAC system shares the air handling assembly and several major components with the truck's standard HVAC system.
• Most importantly, the shared evaporator core contains refrigerant circuits for both the no idle system and the truck's standard A/C
system.
• With this configuration, some procedures required to service the no idle A/C system will require opening the refrigerant circuit of the
truck's standard A/C system.
Trucks equipped with 16UZL No‐Idle HVAC system have two separate HVAC systems (Standard Truck A/C and the MaxxPower unit), it is
important to identify each clearly, so you are troubleshooting the correct system.
Per the Operators Manual page 10: Run the heater at least once a month during the year (for a minimum of 15 minutes).
TABLE OF CONTENTS
Use the menu bar at the top of the screen to navigate through the topics listed.
• Basic Troubleshooting
• Component Identification and Location
https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 8/2/2017
IK1900198 - MaxxPower No Idle Battery-Powered A/C System Diagnostic Guide
Page 2 of 17
A: Compressor Fuse 60 Amp (Maxi)
B: System Controller Fuse 10 amp (Mini
)
C: Blower Fuse 20 amp (Mini
D: Condenser Fan Fuse 20 amp (Mini)
E: Relays (Compressor, Condenser Fan, Blower)
F: Fan and Temperature Control Display
G: System Controller
H: Compressor Controller
I: Linear Power Module
J: Blend Door Actuator
K: Inlet Temperature Air Sensor
L: Discharge Temperature Sensor
M: Evaporator Blower
N: Condenser Fan
O: High Pressure Switch
P: Compressor
Q: Thermal Limit Switch – Compressor
R: Evaporator Inlet Filter
• Diagnostic Information ‐ Link to ProStar Technician Manual
• Circuit Diagrams
• Photos with Call Outs
• Parts Information ‐ with Cold Loop Identification
• Additional Resources
• SRT Information
Basic Troubleshooting
Prior to replacing any components, these basic electrical checks should be performed.
• System will not turn on.
• System starts and cools, but then stops cooling or shuts off.
• Verify proper power and ground is present at the system controller. (Load test the circuits with a headlamp). If the complaint is the
system stops cooling, verify you still have power and ground at 31 and 32 when the issue occurs (Figure 1)
• Verify 12 volt input to pin 6 from the Cool Switch (Figure 1)
• Verify ground control output from pin 3 to the 150A Relay and Condenser Fan Relay
If you have ground control from pin 3 to the relays and the system is still not operating properly, the system controller is not at fault. Continue
with further diagnostics.
Figure 1
https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 8/2/2017
IK1900198 - MaxxPower No Idle Battery-Powered A/C System Diagnostic Guide
Page 3 of 17
• Verify proper voltage at pin 30 (Figure 2) of the 150A Relay. (Load test the circuit with a headlamp).
◦ If you do not have proper voltage at this point, you need to check the truck wiring from the fuses in the battery box to the relay
terminal.
• Verify power on pin 1 and ground on pin 2 of the Relay Control. (Load test both circuits with a headlamp).
• Verify the relay engages and power is present on the output pin 87 of the 150A Relay to the Compressor Controller Circuit Board. (Figure
2)
Figure 2
https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 8/2/2017
IK1900198 - MaxxPower No Idle Battery-Powered A/C System Diagnostic Guide
Page 4 of 17
• The 150A fuse feeds power to the compressor controller circuit board (Figure 2)
https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 8/2/2017
IK1900198 - MaxxPower No Idle Battery-Powered A/C System Diagnostic Guide
Page 5 of 17
• Check the 4 pin connector between the fuse and the compressor controller circuit board, ensuring the terminals are fully seated and
locked. (Figure 4)
• Verify proper power terminal C1 of the compressor controller connector. (Load test the circuit with a headlamp). (Figure 3)
Figure 3
• Depending on the type of compressor controller, you will have one of the 2 style connectors on the compressor (Flag or Cluster Block).
• Check for 6 volts cycling on each of the three wires.
Figure 4
https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 8/2/2017
IK1900198 - MaxxPower No Idle Battery-Powered A/C System Diagnostic Guide
Page 6 of 17
( Return to Table of Contents )
Component Identification and Location
Navistar main system fuses in battery box:
Navistar main system fuses
• Location: Inside battery box
• These fuses are identified on the wiring diagram as F6 and F7
150A Relay for Units built June 23, 2014 or later
• This relay also applies to units that have had the power
harness upgrade ‐ Safety Recall 14516
https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 8/2/2017
IK1900198 - MaxxPower No Idle Battery-Powered A/C System Diagnostic Guide
Page 7 of 17
A: Compressor Fuse ‐ (No longer used)
• Removed with Safety Recall 14516.
B: System Controller Fuse 10 Amp (Mini)
A‐E: Fuses and Relays
• This fuse provides short circuit protection for the unit
controls.
• Location: On the control center
C: Blower Fuse 20 Amp (Mini)
• This fuse provides short circuit protection for the evaporator
blower.
• Location: On the control center
D: Condenser Fan Fuse 20 Amp (Mini)
• This fuse provides short circuit protection for the condenser
fan.
• Location: On the control center
E: Relays
• Location: On the control center
• Compressor Relay ‐ (No longer used)
◦ Removed with Safety Recall 14516.
• Condenser Fan Relay
◦ This relay controls the voltage to the condenser fan.
◦ (ENGINE OFF MODE)
• Blower Motor Relay
◦ This relay controls the voltage to the evaporator blower
◦ (ENGINE OFF and ENGINE ON MODE)
F: Switches / Fan and Temperature Control Display
F: Switches / Fan and Temperature Control Display:
• COOL / No Idle switch:
◦ Lights up and starts the MaxxPower A/C unit at default
settings in the parked mode.
• HEAT / No Idle switch:
◦ Lights up and starts the MaxxPower unit and auxiliary
coolant heater at default settings in the parked mode.
• LED Display:
◦ Allows for temperature and Blower speed adjustment of
the MaxxPower unit when operating in A/C or heat
mode.
https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 8/2/2017
IK1900198 - MaxxPower No Idle Battery-Powered A/C System Diagnostic Guide
Page 8 of 17
◦ Operates like standard Auxiliary HVAC when the engine
is running.
◦ MaxxPower A/C Unit and Auxiliary Coolant Heater ‐ stop
when, engine is started, unit is shut off or batteries are
depleted.
G: System Controller:
G: System Controller
• This device stores the operating program and controls the
MaxxPower unit.
• Location: Under the bunk, next to blend door motor, under
the grey 32 pin connector.
H: Compressor Controller:
H: Compressor Controller:
• This device controls the output voltage to the variable speed
compressor.
• Location: On the top / rear area under the plastic access
cover.
I: Linear Power Module:
I: Linear Power Module (LPM):
• This module controls the amount of voltage delivered to the
evaporator blower creating variable blower speeds.
• Location: On the blower wheel housing.
J: Blend Door Actuator:
J: Blend Door Actuator:
https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 8/2/2017
IK1900198 - MaxxPower No Idle Battery-Powered A/C System Diagnostic Guide
Page 9 of 17
• This actuator operates the blend door, changing air flow path
through the MaxxPower evaporator coil and heater core.
• Location: Under the bunk, near the blower motor.
K‐L: Inlet and Discharge Temperature Sensor:
K: Inlet Temperature Sensor:
• This sensor monitors the return air temperature in front of the
evaporator coil.
L: Discharge Temperature Sensor ‐ Freeze Switch:
• This sensor monitors the evaporator outlet temperature as it
enters the vehicle duct system.
M: Evaporator Blower:
M: Evaporator Blower:
• This blower pulls air through the evaporator coil or heater
core and blows conditioned air into the interior of the sleeper.
This blower operates with parked (no‐idle) and engine driven
systems.
N: Condenser Fan:
N: Condenser Fan:
• This blower draws air from outside the truck, through a
section of the louvered door on the passenger side and pushes
it through the condenser coil to cool the refrigerant flowing
through the system. The hot air is exhausted out the same
louver panel on the passenger side of the truck.
O:High Pressure Switch:
O: High Pressure Switch:
• This brazed pressure switch will open and prevent the
operation of the compressor due to high internal pressure. It
is NOT serviceable.
https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 8/2/2017
IK1900198 - MaxxPower No Idle Battery-Powered A/C System Diagnostic Guide
Page 10 of 17
P: Compressor:
P: Compressor
• This unit is part of the hermetically sealed refrigeration
system.
Q: Thermal Limit Switch on Compressor:
Q: Thermal Limit Switch on Compressor:
• This is a normally closed (auto reset) switch to protect the
compressor from high temperature.
R: Evaporator Inlet Filter:
• This filter protects the evaporator coil from dust and debris.
• It needs to be inspected and serviced periodically during
routine maintenance.
( Return to Table of Contents )
Diagnostic Information
Please refer to the 2010‐2016 ProStar Technician Manual (0000863170) for step based diagnostics:
( Return to Table of Contents )
Circuit Diagrams
https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 8/2/2017
IK1900198 - MaxxPower No Idle Battery-Powered A/C System Diagnostic Guide
Page 11 of 17
The Bergstrom No‐Idle HVAC System uses a Bergstrom harness that connects to the OEM harness.
• The wiring schematic books will only show the OEM wiring.
• The PDFs below will outline the OEM wiring and show all the Bergstrom wiring.
• The wiring shown as "A/C UNIT" is where the OEM and Bergstrom harnesses meet.
Also note the OEM wiring has standard sleeper HVAC wiring and all other sleeper wiring configurations. Take time to ensure you're looking at
the correct schematic for this system. In the most current schematic book "0000002122" the No‐Idle system wiring starts on Ch 12 Pg 15.
• Discharge Sensor / Air inlet sensor temp chart CLICK HERE
• Service Portal Master Service Information CLICK HERE
Circuit Diagrams vary based on the build date of the unit
◦ For units that have had Safety Recall 14516 performed, refer to the schematic "06/23/2014 and newer"
MaxxPower No‐Idle System Circuit Diagram (PDF)
Prior to 11/11/2013
CLICK HERE
MaxxPower No‐Idle System Circuit Diagram (PDF)
11/11/2013 to 06/23/2014 CLICK HERE
MaxxPower No‐Idle System Circuit Diagram (PDF)
06/23/2014 and newer
CLICK HERE
( Return to Table of Contents )
Photos with Call Outs
Figure 5
Figure 6
https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 8/2/2017
IK1900198 - MaxxPower No Idle Battery-Powered A/C System Diagnostic Guide
Page 12 of 17
( Return to Table of Contents )
Service Part(s) Information
Part #
Description
Qty.
2614669C1
Sealed Ref System 12V, Cold Loop *See Note Below* This Cold Loop will only work for ProStar and LoneStar
1
3685807C1
Condenser Fan
1
3695241C1
Temp Sensor
2
4060729C1
System Controller (Under the Grey 32 Pin Connector)
1
2517316C1
Compressor Controller (Circuit Board) with Cluster Block Connector (Blue 32 Pin Connector) *See Figure 7 Below*
1
2602024C92
Compressor Controller (Circuit Board) with Flag Connectors (Blue 32 Pin Connector) *See Figure 7 Below*
1
2602548C91
Blend Door (The physical door)
1
3685800C1
Blend Door Actuator
1
3693481C1
LPM
1
2602545C91
Kit, Bunk Blower Motor with Scroll Assembly
1
3685805C1
Evaporator Inlet Filter (Blue)
1
REPLACMENT OF NEW REFRIGERANT LOOP 2614669C1 MAY ALSO REQUIRE THE REPLACMENT OF THE NEW COMPRESSOR CONTROLLER WITH
CLUSTER BLOCK CONNECTOR 4047671C91 AS WELL.
Replacing the Cold Loop
https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 8/2/2017
IK1900198 - MaxxPower No Idle Battery-Powered A/C System Diagnostic Guide
Page 13 of 17
The Bergstrom Maxx‐Power air conditioning system has a cold loop replacement housing used to replace the non‐serviceable air conditioning
components. If the system has lost its refrigerant, if there is a compressor failure, or damage to the evaporator, condenser, or refrigerant lines,
the cold loop will need to be replaced.
- High density negative paste, improves performance and...
- Enhanced life alloy or Silver Calcium stamped alloy...
- Calcium lead positive grid, maximizes conductivity and...
- Robust envelope separator with puncture resistant back...
- Vent cap design that resists acid leakage
- High density negative paste, improves performance and...
- Enhanced life alloy or Silver Calcium stamped alloy...
- Calcium Lead positive grid, maximizes conductivity and...
- Robust Envelope Separator with puncture-resistant back...
- Vent cap design that resists acid leakage
Last update on 2026-06-29 / Affiliate links / Images from Amazon Product Advertising API
If the PDF is very large, it may not load in the preview below.
Some older TSBs had multiple PDFs — visit the NHTSA Website to view all PDFs.
If the TSB PDF does not show, download or view it on the NHTSA Website.
Click on the (+) Plus Sign
Then Click on Associated Document(s)
Search NHTSA Database for Recalls
Search NHTSA Database for Vehicle Investigations
View Latest Vehicle Investigations
Search NHTSA Database for Vehicle Complaints
View Latest Vehicle Complaints
TSB/Document ID: IK1900198
Replacement Service Bulletin Number:
MFR Communication Date: 2017-07-31
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM:12V/24V/48V BATTERY
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
- [Notice] When you receive a used device, it may be a customer return resold by Amazon without inspection. You can exchange it for a new one through Amazon. As this situation is unavoidable, we sincerely apologize. For any issues, contacting us via Amazon's "Messages" is the best way. THINKSCAN 689BT Bidirectional Scan Tool Can Be Used Immediately After It is Turned On, Without Complicated Registration Process, Which is More Convenient & Quick.
- Full Bi-Directional Control & 3000+ Active Tests: Take control and test components like actuators, fuel injectors, relays, and cooling fans in real time. You’ll quickly see if the problem is in the part itself or the control module — saving you hours of guesswork and frustrating trial-and-error.
- Advanced ECU Coding Capabilities: Handle module matching and hidden feature activation with confidence. When you replace an ECU or want to customize settings, this obd2 scanner diagnostic bi directional tool gives you the professional-level capabilities you need without the dealership price tag.
- 34+ Useful Reset and Maintenance Functions: Complete everyday service tasks smoothly with a wide range of helpful reset and maintenance functions. Whether you’re keeping up with regular upkeep or tackling a specific job, this scanner makes maintenance simpler and less stressful for both DIYers and pros.
- Comprehensive Full System Diagnostics: Diagnose every major system — Engine, Transmission, ABS, SRS, TPMS, and more — all in one place. Finally stop wondering if you’re missing something important; get the full picture and clear codes with ease.
Last update on 2026-07-02 / Affiliate links / Images from Amazon Product Advertising API
- Top Reasons to Choose the D7S OBD2 Scanner: XTOOL D7S car scan tool, an upgrade of XTOOL D7, offers comprehensive features for automotive technicians, workshops, and DIY enthusiasts 1. Upgraded Hardware: 2+64GB memory, rear camera, intuitive interface, foldable bracket 2. Complete Diagnostics: FCA
Autoauth, OE-level all system scan, 39+ maintenance services, 4K+ bidirectional, CANFD/DoIP protocol 3. Advanced Capabilities: ECU c0ding, PMI functions 4. Wide Compatibility: Support 10,000+ models, covering 99% vehicle brands 5. Multi-language: Available in 22+ languages, No IP Restrictions 6. 3-Year Updates: Save 300 bucks on software updates for the latest features and optimizations - 2026 Upgraded D7S Car Scanner Features: The newly 2026 D7S V2.0 scanner for car brings exciting features for advanced vehicle diagnostics and enhanced user experience 1. FCA AutoAuth: Now supports FCA SGW module for Chrysler, for Jeep, for Dodge (2018+), for Fiat (2017+), enabling faster vehicle communication without gateway restrictions 2. PMI (Offline ECU Pr0gramming): Allows for Ford, for Lincoln, and for Mazda ECU pr0gramming for new modules 3. Optimized Diagnostic Report 2.0: Personalized reports with logos and customer info for auto shops. Note: Compatibility varies by cars, please check before order
- 39+ Services/Resets/Adaptations/Relearns/Calibrations: XTOOL D7S full system car scanner diagnostic tool tackles 99% of common car issues through its 36+ special functions, including Oil Reset, EPB, SAS, BMS, Throttle Reset, Injector C0ding, ABS Bleed, TPMS Reset, Power Balance, etc and also covers specific-vehicle functions like Crank Sensor Relearn, ABS Initialization, Cylinder Power Balance, Fuel Trim Reset, Idle Relearn etc. This car diagnostic scanner enhances efficiency, making repairs and maintenance hassle-free. Tip: DO NOT for All vehicles, please check compatibility first
- Cost-effective ECU C0ding Scan Tool for Specific Brands: Enhance your vehicle's performance with XTOOL D7S! This obd2 scanner all systems bidirectional offers advanced capabilities at an affordable price, supports online for BMW, for Benz and offline for BENZ, for MIT, along with PMI functions for Ford, for Mazda, and for Lincoln. Ideal for technicians and DIY enthusiasts, this automotive scanner diagnostic tool optimizes vehicle performance and enhances the driving experience. Note: Not for all cars and modules, please send car VIN to check the compatibility before purchase
- OE All System Diagnostic & 8 Pids Graphing: XTOOL D7S is a comprehensive all system bi directional obd2 scanner that delivers dealer-level diagnostics, completely controlling over your vehicle’s performance and health. This automotive scan tool can read and clear DTCs, view live data and ECU information, retrieve freeze frames, and perform active tests and full obd2 functions. This bi-directional scan tool can can identify your vehicle's make, model, and year information with just one click and show up to 8 PIDs live data with options for CSV viewing, playback, and recording for in-depth analysis. It is easy-to-use for both professionals and beginners, helping pinpoint issues efficiently
Last update on 2026-06-30 / Affiliate links / Images from Amazon Product Advertising API
- 【✅Compared to BOSSCOMM IF742, IF745 Offers Full-System Diagnostics】The BOSSCOMM IF745 car diagnostic scanner is an upgraded model of IF742. In addition to supporting all OBD2 Code Reader functions and 6 reset options (ABS/EPB/SAS/BMS/Oil/Throttle), it expands diagnostics from 4 systems (Check Engine/ABS/SRS/Transmission) to vehicle All systems, including Steering, Suspension, and Body Electronics. This provides deeper, more comprehensive diagnostic capabilities.
- 【✨10 OBD2 Functions】The BOSSCOMM IF745 scan tool’s DTC Lookup instantly translates fault codes into user-friendly explanations, its I/M Readiness feature streamlines emissions testing with a single tap, and Freeze Frame lets you pinpoint the exact moment of a fault for in-depth root-cause diagnosis. Combined with a live data dashboard and advanced diagnostics (O2S, OBMon, EVAP), it delivers comprehensive insights for confident troubleshooting.
- 【✨Deep Diagnostics for All Vehicle System Modules】Beyond code reading/clearing and ECU information retrieval, our all-in-one data stream feature lets you inspect all current fault codes and their locations across the vehicle’s systems. This vehicle code reader helps you turn off dashboard warning lights and perform a comprehensive self-check of your car at home—no more back-and-forth trips to the repair shop or hefty inspection fees.
- 【✨6 Essential Resets: ABS Bleeding, Oil, EPB, SAS, Throttle, BMS】The BOSSCOMM IF745 obd2 scanner diagnostic tool swiftly purges air from brake lines to restore braking sensitivity, fine-tunes maintenance cycles to eliminate false alerts, resolves parking brake issues with one-click control, recalibrates steering sensors for stability, optimizes engine idling/acceleration for smoother performance, and deeply resets battery systems to extend lifespan and range via precise parameter adjustments.❗NOTE: Does NOT support bidirectional control, coding, or programming.
- 【✨10,000+ Car Models, AutoVIN, 13 Languages】The BOSSCOMM IF745 vehicle scanner diagnostic tool covers 73+ global car brands and offers support in 13 languages, making it perfect for DIYers, auto mechanics, or as a thoughtful gift. With a single-click AutoVIN feature, it instantly retrieves vehicle serial numbers, streamlining diagnostics for users globally. This adaptable tool balances user-friendliness with precision, catering to both personal and professional requirements.✅Unsure about compatibility? Compatibility will vary on vehicles' model and year, pls reach us via 📧 [email protected] 📧 before purchase.
Last update on 2026-07-02 / Affiliate links / Images from Amazon Product Advertising API
This product presentation was made with AAWP plugin.