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Home >> Chrysler >> 2005 >> Pacifica Limited >> Repair and Diagnosis >> Accessories & Equipment >> Seats >> Body Diagnostic Procedures - Diagnostic Information And Procedures - Chime, Communication, Door Ajar, Electrically Heated Systems, Exterior Lighting >> Communication >> Symptom: *NO RESPONSE FROM AUTOMATIC TEMPERATURE CONTROL MODULE >> Diagnostic Procedure

Diagnostic Procedure

NO RESPONSE FROM AUTOMATIC TEMPERATURE CONTROL MODULE SYMPTOM CHART

TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, enter Body then Body Computer.
Was the DRB able to I/D or communicate with the BCM?
Yes --> Go To 2
No --> Refer to the appropriate test for problems related to no communication with the BCM.
Perform BODY VERIFICATION TEST - VER 1 .		 All
2 Turn the ignition off.
Disconnect the ATC C1 harness connector.
Using a 12-volt test light connected to 12-volts, probe the Ground circuit.
Is the test light illuminated?
Yes --> Go To 3
No --> Repair the Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1 .		 All
3 Turn the ignition off.
Disconnect the ATC C1 harness connector.
Using a 12-volt test light connected to ground, probe the Fused B+ circuit.
Is the test light illuminated?
Yes --> Go To 4
No --> Repair the Fused B+ circuit for an open or short. Refer to SYSTEM WIRING DIAGRAMS .
Perform BODY VERIFICATION TEST - VER 1 .		 All
4 Turn the ignition off.
Disconnect the ATC C1 harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Fused Run Relay Output circuit.
Is the test light illuminated?
Yes --> Go To 5
No --> Repair the Fused Run Relay Output circuit for an open or short.
Refer to SYSTEM WIRING DIAGRAMS .
Perform BODY VERIFICATION TEST - VER 1 .		 All
5
NOTE: Ensure there is PCI Bus communication with other modules on the vehicle before proceeding. If not, refer to the appropriate test and repair as necessary.
Disconnect the ATC C1 harness connector.Use Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and black test probes.Connect the scope input cable to the channel one connector on the DRB. Attach the red and black leads and the cable to probe adapter to the scope input cable.With the DRBIII® select Pep Module Tools.Select lab scope.Select Live Data.Select 12 volt square wave.Press F2 for Scope.Press F2 and use the down arrow to set voltage range to 20 volts. Press F2 again when complete.Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus circuit in the ATC connector.Turn the ignition on.Observe the voltage display on the DRB Lab Scope.Does the voltage pulse from 0 to approximately 7.5 volts?Yes --> Go To 6No --> Repair the PCI Bus circuit for an open.Perform BODY VERIFICATION TEST - VER 1 .		 All
6 If there are no possible causes remaining, view repair.
Repair
Replace the Automatic Temperature Control Module in accordance with the service information.
Perform BODY VERIFICATION TEST - VER 1 .		 All
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