Lost communication with ecm pcm a3/9/2023 ![]() Disconnect the connector and check each wire for a short to ground. Refer to the service manual and locate the contacts of the corresponding module. Each CAN bus provides communication between the ECM and at least 9 modules. All later car models have 18 or more modules. Rocker modules are usually found under the seat, in the console, or in the trunk. The airbag modules will be located inside the door panel or under the carpet towards the center of the vehicle. ![]() The location of the module depends on what it is working with. Depending on the manufacturer, they can be located anywhere inside the car - under the carpet near the sill, under the seat, behind the protective panel, in front of the center console (requires removal of the console) or behind the passenger's airbag. There are at least two places for the CAN bus.
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