Audi A4 2018 Wiring Diagrams PDF | 2.0L TFSI & 3.0L TFSI Quattro

This complete Audi A4 2018 Wiring Diagrams Manual provides original OEM-level schematics for all electrical and communication systems. It’s essential for technicians, retrofit specialists, and professional workshops working on B9 platform Audi A4 vehicles with 2.0L TFSI and 3.0L TFSI Quattro powertrains.

Systems Covered

• Air Conditioning and Climate Control Circuits (HVAC module, sensors, and motors)

• ABS/ESP & Brake Electronics – hydraulic unit and wheel speed sensors

• Central Locking and Anti-Theft System – keyless access, immobilizer, alarm system

• Body Control and Lighting Modules – exterior/interior light distribution, BCM2

• CAN, LIN & FlexRay Data Lines – full communication layout for ECU interlinking

• Cooling System & Auxiliary Circuits – fans, control relays, and hybrid coolant pumps

Table of Contents (Extracted via OCR)

• Air Conditioning System
   • Automatic A/C Diagrams (1–5)
   • Temperature Sensors and Actuator Circuits
   • Compressor Control Module

• ABS / Brake Electronics
   • Wheel Speed Sensors
   • Hydraulic Control Unit
   • ABS Control Module

• Central Locking / Anti-Theft
   • KESSY System, Immobilizer
   • Remote Key and Locking Circuits
   • Alarm Siren and Trunk Sensors

• Body & Lighting
   • BCM2 (Body Control Module 2)
   • Headlamp and Tail Lamp Circuits
   • Interior Illumination

• Data Communication
   • CAN, LIN, FlexRay Bus Layout
   • Gateway Control Module
   • ECU Interconnection Overview

• Cooling & Power Circuits
   • Cooling Fans and Relays
   • Auxiliary Heater Pump
   • Hybrid Cooling Module

Technical Highlights

• OE color-coded wiring with wire gauge and ground IDs

• Complete pin-outs for connectors and terminal references

• Cross-linked power supply and signal paths

• Hybrid-ready schematics for mild hybrid 48V architecture

• Fully compatible with diagnostic suites: VAS, ODIS, VCDS, OBDeleven

File Information

• Format: PDF (Digital Download)

• Language: English

• Pages: 164

⚠️ Notice

Digital delivery only — no physical media is shipped. Ensure Adobe Reader or any modern PDF viewer is installed.