After picking up the vehicle, a test drive was conducted. When the ignition switch was turned on, several warning lights on the instrument cluster remained illuminated; upon attempting to start the engine, the starter motor did not engage. Using an automotive diagnostic scanner, it was discovered that multiple control modules contained fault codes indicating communication failures (missing data) with the engine control module, transmission control module, and steering column control module, Additionally, the central gateway module contained multiple fault codes indicating communication failures on the Chassis Controller Area Network (CAN E) bus—including bus shutdown, short to ground, and short to positive—leading to the conclusion that the vehicle’s CAN E bus communication had failed.

Locate the CAN E bus voltage distributor X30/30 at the left front door sill (Fig. 1). It has a total of 7 wire connectors, numbered sequentially from 1 to 7; the connector with 3 wires is connector No. 1.