DTC U0542-81: Invalid Data Received From Headlamp Control Module "A" - Invalid serial data received: Action
- Refer to the appropriate service information and inspect the Headlamp Control Module power supply circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness as necessary
- Using the Jaguar Land Rover approved diagnostic equipment, complete a CAN network integrity test. Refer to the appropriate service information and inspect the SUB-CAN network for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness as necessary