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

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Document
IK1900228
ID:

Availability: ISIS, FleetISIS
Major
ACCESSORIES
System:

Revision: 9
Created:

8/18/2014

Current
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Last
Modified:

5/26/2015

Author:

Kevin
Kochanek

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

CHANGE LOG
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
2/24/2015 ­ Corrected diagnostic flow steps
12/11/2014 - Added Pre­2010 information to reference dealer to Pre-2010 Resource Center. Adjusted document to make it easier to find in iKnow.

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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

3983

2

Rear A/C Temperature Control Switch
Error

520465

2

A/C Control Head Multiple Motor Faults

Customer Observations or Concerns:

https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 6/1/2015

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

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Page 2 of 5

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 Comments

Robinair Air Conditioning Machine
34988
or equivalent

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:
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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.
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IK1900226 A/C Control Head Issues
IK1900225 A/C Mechanical Pressures diagnostics
IK1900223 A/C Sensor/ Electronic Issues
IK1900198 12V-No Idle HVAC Unit
IK1900227 Rear A/C Electrical and Mechanical Diagnostics

DIAGNOSTIC STEPS

Step Action

Decision

Customer Interview:

Yes: cab A/C works correctly but rear A/C does
not: Go to step 7.

Review the Repair Order to determine the following:

YES: concern is with MaxxPro No-Idle HVAC
unit: Go to IK1900198

1

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What is the Air Conditioning System doing specifically? (No cold air, not cold enough, no air flow at
vent, or no defrost?
When does the concern occur? Vehicle stationary, when idling 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 No-Idle System?

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?

https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlID... 6/1/2015

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

Step Action

Page 3 of 5

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