1. Good Morning!

2. Automotive Service Technician
Level 3
Multiplexing and Networking
Introduction
Why is it important for you to learn this skill?
The increased use of microprocessors and electronics has led to improvements that help satisfy both the increasing customer demand for advanced electrical options and the manufacture’s need to reduce vehicle weight. These requirements are met, in part, by approaching the entire electrical system as one complete electronic system containing specific multiplexed networks monitored by a central unit. You must be AWARE of networks in vehicles in order to avoid damaging components and the network during service work.
Why do we network modules?

3. Introduction
Lawrence Potyondi Cellular Entered the trades in =23 years experience

4. Objective Explain the purpose of networked components.
Explain the operation of a typical data bus system.
Identify possible problems, symptoms and corrective measures.
Automotive Service Technician (Learning Guide) – Multiplexing and Networking
Automotive Electricity and Electronics – Chapter 16
Advanced Engine Performance Diagnosis – Chapter 2

5. Pre-Assessment Networking and Multiplexing Network Design Terminology
Types/Classifications/Protocols
Diagnostics and Troubleshooting

6. Presentation Terminology Types/Classifications/Protocols
Network Design
Diagnostics and Troubleshooting
CAN (Controller Area Networking)

7. Terminology
Network - An electronic system composed of control modules and wiring that allow electrical signals to be used to send or receive information between modules. Baud Rate – Pg. 29 Advanced Engine Performance Diagnosis Multiplexing – A process of sending multiple signals of information at the same time over a signal wire. Serial Data – Pg. 8 Learning Guide – Multiplexing and Networking Binary - A computer system that uses a series of zeros and ones to represent information. Node – Pg. 217 Automotive Electricity and Electronics Protocol – A set of rules or a standard used between computers or electronic control modules. Protocols include the type of electrical connectors, voltage levels, and frequency of the transmitted messages. Protocols, therefore, include both the hardware and software needed to communicate between modules.

8. Types/Classifications/Protocols
Pg. 32 to 33 Advanced Engine Performance Diagnosis
Pg. 5 Learning Guide - Multiplexing and Networking
Pg. 221 to 229 Automotive Electricity and Electronics
SAE (Society of Automotive Engineers)
Class A < 10 Kbps (UART, CCD)
Class B 10.4 Kbps to 125 Kbps (GM class 2, PCI)
Class C 125 Kbps to 1 Mbps (Can 2.0)
J1850 (PWM)
ISO (International Standards Organization)
ISO (CAN)
ISO (CAN)
ISO (CAN C)
ABS (Automotive Service Technician) vs ABS (Plumbing)

9. Network Design Pg. 32 to 33 Advanced Engine Performance Diagnosis
Pg. 6 to 7 Learning Guide - Multiplexing and Networking
Pg. 218 to 220 Automotive Electricity and Electronics
Electronic Control Module (Node) to Electronic Control Module (Node) Communication Paths
Simply how it is connected in the vehicle
Star Pg. 33
Ring Pg. 7
Hybrid (Star/Ring) Pg. 33
Bus Pg. 6

10. Diagnostics and Troubleshooting
How? So what? Now what?
Open? Short to Voltage? Short to Ground?
Technician A and Technician B
Step by Step Process (8 steps)
Parasitic draw (sleep and awake)

11. CAN CAN (Controller Area Network)
Pg. 226 Automotive Electricity and Electronics
Pg. 34 Advanced Engine Performance Diagnosis
CAN C
All 2008 and later vehicles
SAE J2284/ISO Protocol
Bps
Bit time 2uS (2 microseconds)
Sample occurs 1.5uS
2.5 volts idle logic 1
Can+ (high) volts /logic 0/pin 6 DLC
Can– (low) volts/ logic 0/pin 14 DLC
Difference between CAN+ (high) and CAN- (low) has to be <3.0 volts
Resistance at data link connector (DLC) is 60 ohms pg. 35 Advanced Engine Performance
Sleep 0 volts on both can+ and can-
Gateway (Can C to other networks)

12. Practice Practicum (Shop work) Tools Scan tool Multimeter Oscilloscope
Breakout box
Breakout connectors

13. Post-Assessment Networking and Multiplexing Network Design Terminology
Types/Classifications/Protocols
Diagnostics and Troubleshooting

14. Summary Things to think about… Critical Incident Questionaire.
Fibre Optics – MOST (Media Oriented System Transport Bus)
POF (Plastic Optical Fiber) 10 million bps
D2B (Domestic Digital Bus) 5,600,000 bps
LIN (Local Interconnect Network Bus) 19,200 bps – charging systems (alternators)
Wireless (Bluetooth 2.4 GHz radio spectrum) BSIG (Bluetooth Special Interest Group)
Critical Incident Questionaire.