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Home >> Chrysler >> 2004 >> Pacifica AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Body Diagnostic Procedures - Communication, Door Ajar, Electrically Heated Systems, Exterior Lighting >> Communication >> Symptom: *NO RESPONSE FROM CONTROLLER ANTILOCK BRAKE >> Diagnostic Procedure

Diagnostic Procedure

*NO RESPONSE FROM CONTROLLER ANTILOCK BRAKE - DIAGNOSTIC PROCEDURE

TEST ACTION APPLICABILITY
1 Turn the ignition on.
NOTE: As Soon as one or more module communicates with the DRBIII®, answer the question.

With the DRBIII®, attempt to communicate with the Airbag Control Module.
With the DRBIII®, attempt to communicate with the Body Control Module (BCM).
Was the DRBIII® able to I/D or establish communications with either of the modules?
  1. Yes: Go To 2
  2. No: Refer to the COMMUNICATION  and perform the symptom SYMPTOM: *PCI BUS COMMUNICATION FAILURE .

    Perform ABS VERIFICATION TEST VER-1 .

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2 Turn the ignition off.
Disconnect the CAB harness connector.
Using a 12-volt test light connected to 12-volts, probe both ground circuits.
Is the test light illuminated for each circuit?
  1. Yes: Go To 3
  2. No: Repair the ground circuit(s) for an open.

    Perform ABS VERIFICATION TEST VER-1 .

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3 Turn the ignition off.
Disconnect the CAB harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Fused Run Relay Output circuit and the Fused B(+) (Valve) circuit.
Is the test light illuminated?
  1. Yes: Go To 4
  2. No: Repair the Fused Run Relay Output circuit or the Fused B(+) (Valve) circuit for an open.

    Perform ABS VERIFICATION TEST VER-1 .

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4
NOTE: Ensure there is PCI Bus communication with other modules on the vehicle before proceeding. If not, refer to the SYMPTOM LIST from the menu and repair as necessary.
Disconnect the CAB 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 CAB connector.Turn the ignition on.Observe the voltage display on the DRBIII® Lab Scope.Does the voltage pulse from 0 to approximately 7.5 volts?
  1. Yes: Go To 5
  2. No: Repair the PCI Bus circuit for an open.

    Perform ABS VERIFICATION TEST VER-1 .

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5 If there are no possible causes remaining, view repair.
  1. Repair: Replace the Controller Antilock Brake in accordance with the Service Information.

    Perform ABS VERIFICATION TEST VER-1 .

 All
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