IK1900228 - 2010 and Newer Vehicle Air Conditioning Diagnostics (Start Here)

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IK1900228
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Availability: ISIS, FleetISIS

Revision: 11

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Author:

8/18/2014

Kevin
Kochanek

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6

Title : 2010 and Newer Vehicle Air Conditioning Diagnostics (Start Here)
Applies To : Post 2010 NGV

CHANGE LOG
6/30/2015 - Changed formatting of tables in Diagnostic section to fit on one page when printed.
6/24/2015 - Changed all occurences of reference to IK1900198 to reference IK1900235 instead.
05/26/2015 - Fixed link on step 6 to properly route viewer to IK1900226
5/15/2105 - Fixed link to S16046 Manual and added link to PDF for the HVAC System Pressure Test Chart.
4/9/2015 - Added SPN 2609 to symptom table

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DESCRIPTION
This document addresses Air Conditioning issues on the following 2010 to 2014 vehicles with a BCM.
The following procedures will guide the user through : Common Air Conditioning failure areas, diagnostic tools, SRTs, and warranty filing.
Note: For anything Pre­2010, reference the Pre­2010 A/C HVAC Resource Center located IK1900156.
SYMPTOM
Diagnostic Trouble Code(s) & Dashboard Indicator Light(s):
SPN

FMI Description

2609

16

A/C High Pressure Protection

2609

15

Low Charge Protection

1079

1

5 volt sensor supply below normal

3985

9

1552

2

A/C Control Head Circuit Failed To
Communicate With Body Controller
A/C Control Head Temperature Mix DM1

3981

2

A/C Control Head Mode Fault DM1

3984

2

A/C Control Head Air Inlet DM1

2058

9

Rear A/C Data Link Communication Failure

2058

14

Rear A/C Data Link Communication Failure

3982

2

A/C Rear Blower Speed Control Switch Error

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IK1900228 - 2010 and Newer Vehicle Air Conditioning Diagnostics (Start Here)

3983

2

Rear A/C Temperature Control Switch Error

520465

2

A/C Control Head Multiple Motor Faults

Page 2 of 6

Customer Observations or Concerns:
•
•
•
•
•
•

Malfunction Indicator Light (MIL)
No cab air conditioning
"Warm" A/C
No air flow through vents
No rear A/C
Inoperative MaxxPro no‐idle A/C system

SPECIAL TOOLS / SOFTWARE
Tool Description

Tool Number

Robinair Air Conditioning Machine
34988
or equivalent

Comments

Instructions

A/C recovery, vac, and performance test

SERVICE PARTS INFORMATION
Due to variety of configurations, reference the parts catalog for vehicle being repaired.

Parts Catalog

PROCEDURE OVERVIEW:

Do not start engine until steps 2-4 have been completed. If the
engine has been run recently, allow the vehicle to sit for one
hour so system pressures can stabilize.

Consider the following before beginning:
•
•
•

Are any Air Conditioning related AFC’s open?
Was the vehicle recently in for an Air Conditioning repair, in which the system was not properly filled or serviced?
Were A/C repairs made recently, and fault codes not cleared properly?

If the A/C issue is known (blown off hose, visible dye, inoperative blower motor) go directly to the respective steps or iKNow articles listed below. Otherwise, go to
step 1.
•
•
•
•
•

IK1900226 A/C Control Head Issues
IK1900225 A/C Mechanical Pressures diagnostics
IK1900223 A/C Sensor/ Electronic Issues
IK1900235 No-Idle HVAC Operational Check - STARTING POINT
IK1900227 Rear A/C Electrical and Mechanical Diagnostics

DIAGNOSTIC STEPS
Step Action

Decision

Customer Interview:

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IK1900228 - 2010 and Newer Vehicle Air Conditioning Diagnostics (Start Here)

•
•
1

•
•

overnight, or going down the road?
Is the problem intermittent, or happen consistently?
Have you had the vehicle serviced recently? When and where? Was
there an A/C related service performed during that service?
Does issue concern the passenger compartment, the sleeper, or both?
If equipped with a No-Idle system does the issue only happen when
utilizing the No­Idle System?

Page 3 of 6

Yes: cab A/C works correctly but rear
A/C does not: Go to step 7.
YES: concern is with MaxxPro No-Idle
HVAC unit: Go to IK1900235

No: to step 2.

Is the problem confined to the rear A/C system while the Cab A/C works
correctly?
Is the problem confined to the operation or performance of the MaxxPro No Idle
system?

Step

Action

Decision

Preliminary checks:
Note: Do not start engine until steps 2-4 have been completed. If the engine has been run recently,
allow the vehicle to sit for one hour to allow system pressures to stabilize.
Perform a visual check of the A/C system to verify that no obvious problems are present. With the engine
off, inspect the following items:

2

•
•
•
•
•
•
•
•
•
•
•
•
•
•

Compressor and clutch mounting
Compressor clutch coil wiring and connection
Compressor drive belt and belt tensioner
A/C hoses and connections
Condenser mounting