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 RESPONSE FROM RADIO
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Turn the ignition on.
NOTE:
As soon as one or more module communicates with the DRB, answer the question. With the DRB, attempt to communicate with the Airbag Control Module. With the DRB, attempt to communicate with the Body Control Module (BCM). Was the DRB able to I/D or establish communications with either of the modules? Yes --> Go To 2 No --> Refer to the COMMUNICATIONS CATEGORY and perform the symptom PCI Bus Communication Failure. Perform BODY VERIFICATION TEST - VER 1 . |
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| 2 | Turn the ignition off. Disconnect the Radio C1 harness connector. Turn the ignition on. Using a 12-volt test light connected to ground, probe the Fused Ignition Switch Output circuit. Is the test light illuminated? Yes --> Go To 3 No --> Repair the Fused Ignition Switch Output circuit for an open or short. Refer to SYSTEM WIRING DIAGRAMS . Perform BODY VERIFICATION TEST - VER 1 . |
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| 3 | Turn the ignition off. Disconnect the Radio 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? 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 . |
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| 4 | Turn the ignition off. Disconnect the Radio 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? Yes --> Go To 5 No --> Repair the ground circuit for an open. Perform BODY VERIFICATION TEST - VER 1 . |
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| 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 Radio 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 Radio 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 --> Replace the Radio.Perform BODY VERIFICATION TEST - VER 1 .No --> Repair the PCI Bus circuit for an open.Perform BODY VERIFICATION TEST - VER 1 . |
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