Reprogramming the Start/Stop system

Technical Overview

The auto start‑stop system logic is governed by coordinated parameters stored inside the vehicle master Car‑Configuration‑File shared between BCM body gateway, PCM powertrain control module and BMS battery monitoring module. Two configurable modes are available via this reprogramming service: last‑state memory so the system remembers the driver’s last on‑off selection across ignition cycles, or permanent disable of the start‑stop function. This coding workflow reads the original factory CCF dataset, adjusts start‑stop default‑mode flags, executes multi‑module integrity validation and writes modified configuration back via OBD‑II connection. Post‑write, controlled module resets plus a full vehicle sleep‑wake cycle are required for configuration to fully apply. This service only re‑configures existing factory‑fitted hardware; full roll‑back to factory defaults is possible restoring the backed‑up original CCF file.

Core Technical Activation Capabilities

• CCF powertrain‑domain parameter reprogramming: select either last‑state‑memory mode or permanent start‑stop system disable
• Pre‑write multi‑module CCF integrity validation preventing incompatible PCM‑BCM‑BMS parameter combinations before committing data to vehicle modules
• Complete CCF backup‑restore workflow, preserving original factory configuration before applying powertrain‑related changes
• Powertrain diagnostic routines: read PCM, BCM and BMS DTC faults; verify pre‑ and post‑reprogramming start‑stop feature‑flag status
• Supports legacy MY2014‑2016 CAN‑bus platforms and modern MY2017‑2025 ISO 13400‑2 DoIP and MHEV mild‑hybrid vehicle architectures
• Session‑log generation capturing vehicle VIN, timestamp and modified powertrain‑CCF parameters for internal workshop audit‑trail purposes.

Vehicle, Hardware & System Prerequisites

Critical hardware prerequisite: vehicle must have factory‑installed working Auto Start‑Stop hardware including compatible AGM/EFB battery, battery monitoring sensor and relevant control modules. Reprogramming cannot add start‑stop capability to vehicles missing original hardware. Supported MY2014‑2025 Range Rover, Range Rover Sport, Defender, Discovery, Velar, Evoque and full Jaguar passenger‑car range including MHEV models. Host‑system requirement: Windows 10 / Windows 11 64‑bit PC with valid SX‑TOOL software licence. Use J2534 pass‑through adapters for older CAN‑bus vehicles or Enet‑WiFi / Type‑C Enet‑cable hardware for DoIP‑platform vehicles. Stable regulated 12 V battery supply is mandatory for CCF‑write cycles and module resets. Some late‑model secure‑gateway‑protected vehicles may require supplementary online authorisation for powertrain‑domain configuration writes. Note: altering start‑stop behaviour may impact local emissions test compliance, document all changes for customer records.

What This Reprogramming Service Includes

• Start‑Stop system CCF reprogramming workflow for factory‑hardware‑equipped compatible JLR vehicles (memory‑mode or permanent‑disable option)
• Powertrain‑domain CCF backup‑restore tool‑set for start‑stop‑related configuration datasets
• Technical documentation: pre‑reprogramming fault‑check checklist, coding procedure, vehicle sleep‑cycle instructions and post‑modification function‑testing guidance