Operation - Vehicles Without Stop/Start System
WARNING: This page is about a different car, the 2019 Jaguar XJ and 2018 Jaguar XJ. However, it is still accessible from the selected car via links, so may be relevant.
When the Stop/start switch is operated, if the Keyless Vehicle Module (KVM) detects a valid smart key in the vehicle, the Central Junction Box (CJB) transmits a hardwired crank request to the Engine Control Module (ECM). Refer to: ANTI-THEFT - PASSIVE
The ECM energizes the starter motor relay, when:
- it receives a crank request from the CJB
- the brake pedal is pressed
- the Transmission Control Switch (TCS) is in 'P' (Park) or 'N' (Neutral) position.
The energized starter relay supplies battery power to the starter solenoid, which energizes and causes the pinion gear to engage with the ring gear. When the starter solenoid is energized it also closes high-current contacts, which connects battery power from the battery to the motor to turn the engine.