Chrysler 300M 2002 Service Manual page 1887

COMMUNICATION
*NO RESPONSE FROM RADIO —
TEST
9 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 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. Set Probe to x10.
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.
→ Go To 10
No
10 Disconnect the Radio C1 harness connector.
Disconnect the BCM C1 harness connector.
Measure the resistance of the PCI bus circuit between the Radio connector and the
BCM C1 connector.
Is the resistance below 5.0 ohms?
Yes → Replace the Body Control Module in accordance with the service
→ Repair the PCI Bus circuit for an open.
No
Continued
ACTION
Perform BODY VERIFICATION TEST - VER 1.
information.
Perform BODY VERIFICATION TEST - VER 1.
Perform BODY VERIFICATION TEST - VER 1.
164
APPLICABILITY
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All