PCM? ABS, Airbag lights always on, dash erratic

Hi,

Dodge Intrepid 1993: 280K KLM.

The issue is that the airbag and abs indicator lights stay on, and the dash gauges work only periodically. We took it to a Chrysler shop, and they said it was the PCM not sending a signal to the ABS module. I thought that the PCM and ABS module aren't linked.

We suspected it was the ABS module (lifetime warranty), but they want $500 to replace the PCM.

The question is, is it possible that a faulty PCM module is responsilbe for this?

Thanks!