DTC P1657-09: CAN Link Chip Malfunction - Component Failures: Action

Using the Jaguar Land Rover approved diagnostic equipment, perform a CAN network integrity test. Refer to the electrical circuit diagrams and check the High Speed CAN bus (comfort) circuit for short circuit to ground, short circuit to power, open circuit, high resistance or physical damage. Repair the wiring harness as necessary
Using the Jaguar Land Rover approved diagnostic equipment, check the snapshot data to determine the missing message source control module. Check the relevant control module for related DTCs and refer to the relevant DTC index
Using the Jaguar Land Rover approved diagnostic equipment, clear the DTCs and retest. If the fault persists, install a new interactive display module A