Introduction

Introduction

Vehicle Identification Numbers (VIN)
VIN ranges are presented throughout the book in the following manner:
-> VIN 123456 indicates 'up to VIN 123456'; VIN 123456 > indicates 'from VIN 123456 on'.

Electrical System Architecture

Power Supplies
The electrical system is a supply-side switched system. The ignition switch directly carries much of the ignition switched power supply load.

Power supply is provided via three methods:
- Direct battery power supply;
- Ignition switched power supply;
- 'Battery Saver Power Supply'.

The 'Battery Saver Power Supply' circuit is controlled via the GEM (General Electronic Module).

Fuseboxes
The electrical harness incorporates two serviceable power distribution fuseboxes:
- the Power Distribution Fusebox located in the engine compartment;
- the Passenger Junction Fusebox located in the left-hand 'A' Post

All fuses and relays (except the trailer towing accessory kit and two Diesel vehicle relays) are located in the two fuseboxes.

Vehicle Networks
The X-TYPE employs three different networks:
- CAN (Controller Area Network) for high-speed power train communications;
- SCP (Standard Corporate Protocol) network for slower speed body systems communications;
- D2B (Optical) Network for very high-speed 'real-time' audio data transfer.

NOTE: The D2B Network is a fiber optic network with a gateway to the remaining vehicle networks via the Audio Unit. Technician access to the three networks and the Serial Data Link is via the Data Link Connector.

Ground Studs
Circuit ground connections are made at body studs located throughout the vehicle. There are no separate power and logic grounding systems; however, there are a certain number of components that use unique ground points.