Dakota Quad Cab 2WD V8-5.9L VIN Z LDC (2002)
5. Check for continuity between the radio control MUX circuit cavities of the remote radio switch wire harness connector and the 18-way CTM wire
harness connector. There should be continuity. If OK, refer to the proper Diagnostic Procedures manual to test the CTM and the Programmable
Communications Interface (PCI) data bus. If not OK, repair the open radio control MUX circuit as required.