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Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
NO RESPONSE FROM AMPLIFIER - DIAGNOSTIC PROCEDURE

TEST ACTION
1 Turn the ignition on.
NOTE: The Radio must be turned on for the DRB to get a response from the Amplifier.

With the DRB, attempt to communicate with the Radio.
Was the DRB able to I/D or communicate with the Radio?
  1. Yes --> Go To 2
  2. No --> Refer to the symptom list for problems related to no communication with the Radio.

    Perform BODY VERIFICATION TEST - VER 1  .
2 Turn the ignition off.
Disconnect the Amplifier C1 harness connector.
Using a 12-volt test light connected to 12-volts, probe both ground circuits.
Is the test light illuminated for both circuits?
  1. Yes --> Go To 3
  2. No --> Repair the ground circuit for an open.

    Perform BODY VERIFICATION TEST - VER 1  .
3 Turn the ignition off.
Disconnect the Amplifier C1 harness connector.
Using a 12-volt test light connected to ground, probe both Fused B(+) circuits.
Is the test light illuminated for both circuits?
  1. Yes --> Go To 4
  2. No --> Check Junction Block fuse #13 for an open. If OK, repair the Fused B+ circuit for an open.

    Perform BODY VERIFICATION TEST - VER 1  .
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 Amplifier 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(R) 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 Amplifier 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?
  1. Yes --> Replace the Amplifier in accordance with the Service Information.

    Perform BODY VERIFICATION TEST - VER 1  .

  2. No --> Repair the PCI Bus circuit for an open.

    Perform BODY VERIFICATION TEST - VER 1  .
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