NHTSA ID Number: 10115430
Manufacturer Communication Number: IK1900226
TSB/Document Date: 2017-08-16
Summary
Air Conditioning Control Head Diagnostics
IK1900226 Air Conditioning Control Head Diagnostics
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PANAMA
Document
IK1900226
ID:
Availability: ISIS, FleetISIS, IsSIR
Revision: 5
Major
System:
ACCESSORIES
Created:
8/18/2014
English
Last
Modified:
5/4/2017
Author:
Kevin
Kochanek
Current
Language:
Other
Français, Español,
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6797
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Title : Air Conditioning Control Head Diagnostics
Applies To : TerraStar, TranStar
CHANGE LOG
05/04/2017 - Corrected Coding
12/9/2014 - Formatted article to template standard.
10/28/2014 Author updated for feedback purposes
8/05/2014 - Initial Article Release
DESCRIPTION
This document is supplemental toIK1900228 and addresses Control Head issues.
SYMPTOM(s)
Incorrect vent temperatures with compressor engaged and correct pressure gauge readings.
Inoperable modes or blower speeds.
Possible Causes:
Actuator/ Doors needs to be recalibrated
No voltage or ground to HVAC Control head
Failed actuator
Mechanical door damage
Blower stuck
Failed LPM
No A/C request from A/C control head to Body Controller
Diagnostic Trouble Code(s) & Dashboard Indicator Light(s):
DTC/Light
Description
Not Applicable
Not Applicable
Customer Observations or Concerns:Not Applicable
SPECIAL TOOL(s) / SOFTWARE
Tool Description
Fluke DVOM
Universal
Tool Number
Comments
ZTSE4357
Used for checking electrical
Not Applicable
connections
Instructions
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IK1900226 Air Conditioning Control Head Diagnostics
Page 2 of 9
SERVICE PARTS INFORMATION
Kit Description
Part Number
Quantity Required Notes
Not Applicable
Not Applicable
Not Applicable
Not Applicable
Air Conditioning Electrical Diagnostic Steps
Body controller will not engage the clutch when A/C related DTCs are
active. The following procedures are ONLY VALID if the A/C system is fully
charged and the A/C system checks in IK1900228were performed.
When a failed circuit or component is detected, repair as needed and retest
for original problem.
Step Action
HVAC Module Inspection
A. Visually inspect HVAC module for clogged filters, obstructed ducts, and wiring disconnected from actuators and Linear Power
Module (LPM).
Decision
Yes:Repair as needed. If A/C does not operate
correctly, go to step 2. If A/C now operates correctly,
Diagnostic are complete
1
B. Inspect the 5 Amp and 10 Amp, and 30 Amp HVAC fuses.
No:Go to step 2
Are issues detected?
Step Action
Decision
Control Head Power
A. Disconnect the harness from the control head.
B. Turn ignition Key-ON.
2
Yes: Reconnect harness to control head but do not
reassemble control head to dash, and then go to step
3
C. Connect a 12V test light between Pin-A1 and B6 of the A/C control head harness connector (1200).
D. Connect a 12V test light between Pin-A2 and Pin B6 of the A/C control head harness connector (1200).
Note:If using a DMM, both Pin-A1 and Pin-A2 should have 12 V ± 1.5V.
Does the test light illuminate brightly in both steps C and step D?
Step Action
No:Leave control head unplugged and go to Step 22.
Decision
A/C Request to Body Controller:
3
Yes:Go to step 4.
A. Turn ignition Key-ON, HVAC control switch to NORM, and blower ON.
No:Go toStep 5 (A/C Request Diagnostics)..
B. Open DLB.
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IK1900226 Air Conditioning Control Head Diagnostics
Page 3 of 9
C. “Watch”A/C Requestin the DLB Signal column.
Is theA/C Requestbox check-marked?
Step Action
Decision
Yes: A/C system operates correctly.
A/C Operation
A. Start Engine.
No:Blower, Mode, Recirculation, and Temperature
controls do not function: Replace HVAC Controller.
B.Turn HVAC control to NORM, Blower ON, and temperature to coldest setting.
C. Turn blower switch to each speed (1-7) and check for proper fanoperation.
No:Blower speed does not function correctly: Go
toStep 6 (Blower Speed Diagnostics).
D. Turn mode control to each position and check interior vents for proper mode door operation. Note: Allow time for interior
module doors to rotate to correct position.
4
E. Vary mode control from NORM to MAX A/C and check recirculation mode (increase in vent air flow)
F. Vary temperature control switch and check vents for change in air temperature.
Does the system operate correctly including fan, mode control, MAX A/C recirculation, and temperature control?
No:Temperature Control does not operate correctly:
Go toStep 9 (Blend Door Diagnostics).
No: mode control switch does not function correctly:
Go toStep 14 (Mode Control Diagnostics).
No: recirculation does not function correctly: Go
toStep 18 (Recirculation Door Diagnostics).
Step Action
Decision
Yes:Inspect J3 cavity for bent pins and verify body
controller has power and ground.
Note: DLB should show A/C Request field checked
if body controller receives 0V on connector J3
(1600) Pin A2.
A/C Request Diagnostics
After repairs are complete, reassemble unit and retest
for operator concern.
A. Disconnect body controller J3 connector (1600).
B. Turn ignition Key-ON, HVAC control switch to NORM, and blower-ON.
5
C. Measure voltage at PinA2 of connector 1600.
Does Pin-A2 have 0V ?
No:Check the following circuits for open or high
resistance:
Circuit A77A(connector 1600 Pin-A2 to control head
connector 1200 PinA4.
If circuit is good, control head has failed.
After repairs are complete, reassemble unit and retest
for operator concern.
Step Action
Decision
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IK1900226 Air Conditioning Control Head Diagnostics
Page 4 of 9
Yes:leave three wire LPM connector (1220)
unplugged and the Key-On: Go to step 7.
Step C:is Dim: Check B+ circuit from Pin-6 back to
battery for high resistance.After repairs are complete,
reassemble unit and retest for operator concern.
Blower Speed Diagnostics
A.Turn ignition KeyON.
B. Disconnect the three wire LPM connector (1220)
6
C. Use a head lamp to Load test Pin-6 (B+) to a good ground.
D. Use a head lamp to Load test Pin-6 (B+) to Pin-5.
Does the lamp burn brightly on step C and step D?
Step Action
Step C:is bright and step D is Dim: Check the
following circuit for open or high resistance:
Circuit A75G (connector 1220 PinE toleft side dash
mounted dual postground).
After repairs are complete, reassemble unit and retest
for operator concern.
Decision
Control Head Speed Signal
A. Turn blower-ON to highest speed.
B. Measure voltage at Pin-4 to Pin-5.
Yes:Leave the Key-On, and go to step 8.
C. Repeat step 4 for each fan speed.
D.Turn blower off and reconnectthe three wire LPM connector (1220).
7
Dash Switch speed
Off
Control Head Voltage to LPM
0-0.4V
1 (Lowest)
2
3
4
5
6
7 (Highest)
1.4V +/- 0.2
1.8V +/- 0.2
2.4V +/- 0.2
2.75V +/- 0.3
3.35V +/- 0.3
3.9V +/- 0.3
5.0V +/- 0.3
No:KeyOff. Replace control head.
Do the measured voltages for each speed match the chart?
Step Action
Decision
Blower Voltage:
A. Disconnect the two wire blower connector at the LPM.
B. Turn blower-ON to highest speed.
C. Measure voltage between red lead and black lead.
Yes: Replace the blower. Reassemble unit
and retest for operator concern.
D. Repeat step C for each fan speed.
8
Dash Switch Position
Off
1 (Lowest)
2
3
4
5
6
7 (Highest)
Motor Voltage
0V
3.85V
4.96 V +/-0.5
6.60 V +/-0.5
7.7 V +/-0.5
9.35 V +/-0.5
10.73 V +/-0.5
12.10V +/-0.5
Does the motor voltage match the dash-switch speed?
No:Replace the LPM. Reassemble unit and retest for
operator concern.
Action
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IK1900226 Air Conditioning Control Head Diagnostics
Step
Blend Door Recalibration
Page 5 of 9
Decision
A. Turn the ignition Key-ON.
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TSB/Document ID: IK1900226
Replacement Service Bulletin Number:
MFR Communication Date: 2017-05-04
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT:APPLIANCE:AIR CONDITIONER
MFR Component System:
MFR Component Subsystem:
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