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Home >> Jeep >> 2005 >> Wrangler X, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 491 (Body Diagnostic Procedures) >> Diagnostic Information And Procedures >> Airbag >> Symptom List: NO PCI LOOPBACK; NO PCI TRANSMISSION; PCI BUS SHORT TO BATTERY; PCI BUS SHORT TO GROUND >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE - NO PCI LOOPBACK

TEST ACTION APPLICABILITY
1 Turn the ignition on.
NOTE: Ensure the battery is fully charged.
NOTE: For the purpose of this test, the AECM and ORC modules will be referred to as an ACM.

From the list below, select the appropriate module and DTC type for this diagnostic trouble code.
DETERMINE ACTIVE OR STORED DTC
ACM - ACTIVE
Go To 2
ACM - STORED
Go To 6
OCM - ACTIVE DTC
Go To 3
OCM - STORED DTC
Go To 6
NOTE: When reconnecting airbag system components the Ignition must be turned off and the Battery must be disconnected.
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2
WARNING: TO AVOID PERSONAL INJURY OR DEATH, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
WARNING: IF THE AIRBAG CONTROL MODULE IS DROPPED AT ANY TIME, IT MUST BE REPLACED. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND PERSONAL INJURY OR DEATH.
If there are no possible causes remaining, view repair.RepairReplace the Airbag Control Module in accordance with Service Instructions.Perform AIRBAG VERIFICATION TEST - VER 1  .		 All
3 Inspect the passenger OCS wiring to determine if the Bladder and Cushion Service Kit has been installed.
NOTE: Check connectors - for tamper evident material.

Tamper evident material is installed onto the Kit harness to keep the kit components together in shipping and installation.
NOTE: The Bladder and Cushion Service Kit component are calibrated together and should not be disconnected.

If the OCM harness connector can be easily disconnected the OCS is original equipment.
Is it original equipment?
Yes --> Go To 4
No --> Go To 5		 All
4
WARNING: TO AVOID PERSONAL INJURY OR DEATH, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
WARNING: IF THE OCCUPANT CLASSIFICATION MODULE IS DROPPED AT ANY TIME, IT MUST BE REPLACED. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND PERSONAL INJURY OR DEATH.
If there are no possible causes remaining, view repair.RepairReplace the Occupant Classification Module in accordance with Service Instructions.Perform OCS VERIFICATION TEST - VER 1  .		 All
5
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
WARNING: IF THE OCCUPANT CLASSIFICATION MODULE IS DROPPED AT ANY TIME, IT MUST BE REPLACED. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND PERSONAL INJURY OR DEATH.
If there are no possible causes remaining, view repair.Repair:Install or replace the OCS Bladder Service Kit in accordance with service information. Then perform the Verification Required test to remove DTC created by the repair.Perform OCS VERIFICATION TEST - VER 1  .		 All
6
NOTE: Determine which modules this vehicle is equipped with before beginning.
NOTE: When attempting to communicate with any of the modules on this vehicle, the DRB will display 1 of 2 different communication errors: a NO RESPONSE message or a BUS +/- SIGNALS OPEN message.
Turn the ignition on.Using the DRB, attempt to communicate with the following control modules:Airbag Control ModuleOccupant Classification Module - If equippedFront Control Module - If equippedInstrument ClusterOccupant Classification Module (If equipped)Was the DRBIII® able to communicate with one or more Module(s)?Yes --> Go To 7No --> Go To 12		 All
7 Turn the ignition off.
NOTE: Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
NOTE: Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
NOTE: If the DRB can not communicate with a single module, refer to the appropriate test for the related symptom.

Were any problems found?
Yes --> Repair wiring harness/connectors as necessary.
Perform AIRBAG VERIFICATION TEST - VER 1  .
No --> Go To 8		 All
8 Ensure that the battery is fully charged.
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.

Disconnect the ACM harness connector.
Connect the appropriate Load Tool ACM Adapter to the ACM connector.
Turn the ignition on and then reconnect the Battery.
Using a 12-volt test light connected to ground, probe the Fused Ignition Switch Output (Run) Circuit and the Fused Ignition Switch Output (Run/Start) Circuit at the ACM connector.
NOTE: One open circuit will not cause a NO RESPONSE condition.

Is the test light illuminated on both circuits?
Yes --> Go To 9
No --> Repair the Fused Ignition Switch Output (Run) and Fused Ignition Switch Output Run-Start circuits for an open.
Perform AIRBAG VERIFICATION TEST - VER 1  .
NOTE: When reconnecting airbag system components, the ignition must be turned off and the battery must be disconnected.
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9 Ensure that the battery is fully charged.
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.

Disconnect the ACM harness connector.
Connect the appropriate Load Tool ACM Adapter to the ACM connector.
Using a 12-volt test light connected to 12-volts, probe the ground circuit.
NOTE: Make sure test light is connected to the Battery positive terminal.

Is the test light illuminated?
Yes --> Go To 10
No --> Repair the Ground circuit for an open.
Perform AIRBAG VERIFICATION TEST - VER 1  .
When reconnecting Airbag system components, the ignition must be turned off and the battery must be disconnected. 		 All
10
NOTE: Ensure there is PCI bus communication with other modules. If not, refer to the PCI BUS COMMUNICATION FAILURE  symptom and repair as necessary.
WARNING: TO AVOID PERSONAL INJURY OR DEATH, TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
Disconnect the ACM harness connector.Connect the appropriate Load Tool ACM Adapter to the ACM connector.Turn the ignition on and then reconnect the Battery.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 ACM connector.Observe the voltage display on the DRB Lab Scope.Does the voltage pulse from 0 to approximately 7.5 volts?Yes --> Go To 11No --> Repair the PCI Bus circuit for an open.Perform AIRBAG VERIFICATION TEST - VER 1  .		 All
11
WARNING: TO AVOID PERSONAL INJURY OR DEATH, DISCONNECT THE BATTERY AND WAIT TWO MINUTES BEFORE PROCEEDING.
WARNING: IF THE AIRBAG CONTROL MODULE IS DROPPED AT ANY TIME, IT MUST BE REPLACED. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND PERSONAL INJURY OR DEATH.
If there are no possible causes remaining, view repair.RepairReplace the Airbag Control Module in accordance with Service Instructions.Perform AIRBAG VERIFICATION TEST - VER 1  .		 All
12 Turn the ignition off.
Disconnect the PCM/ECM harness connector. Note: If equipped with NGC follow the caution below.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Disconnect the DRB from the Data Link Connector (DLC).
Disconnect the negative battery cable.
Measure the resistance of the PCI Bus circuit between the Data Link Connector (DLC) and the PCM/ECM harness connector.
Is the resistance below 5.0 ohms?
Yes --> Go To 13
No --> Repair the PCI Bus circuit for an open. Note: DO not repair the OCS wiring. If OCS wiring problem is present, install or replace the OCS Service Repair Kit. Then perform the Verification Required test to remove DTC created by the repair.
Perform AIRBAG VERIFICATION TEST - VER 1  .		 All
13
NOTE: Reconnect the PCM/ECM harness connector and the negative battery cable.
Turn the ignition on.Measure the voltage of the PCI Bus circuit at the Data Link Connector (DLC).Is the voltage above 7.0 volts?Yes --> Go To 14No --> Test Complete.		 All
14 Turn the ignition off.
Using a voltmeter, connect one end to the PCI Bus circuit at the DLC, and the other end to ground.
NOTE: When performing the next step turn the ignition off (wait one minute) before disconnecting any module. When the module is disconnected turn the ignition on to check for a short to voltage.

Turn the ignition on.
While monitoring the voltmeter, disconnect each module the vehicle is equipped with one at a time.
Is the voltage steadily above 7.0 volts with all the modules disconnected?
Yes --> Repair the PCI Bus circuit for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1  .
No --> Replace the module that when disconnected the short to voltage was eliminated.
Perform BODY VERIFICATION TEST - VER 1  .		 All
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