P1628-62: Module Ignition Supply Input - Signal compare failure: Action
- Using the Jaguar land Rover approved diagnostic equipment, reconfigure the rear differential control module with the latest level software and perform routine - On Demand Self Test
- Inspect the rear differential control module connector for security, signs of water ingress and pins for damage and/or corrosion
- Refer to the electrical circuit diagrams and check the ignition signal circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness as necessary