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The CAS (Car Access System) module is a critical component in BMW and MINI vehicles, responsible for managing the immobilizer and key recognition. When the CAS module fails, it can lead to issues such as the car starter not working, key recognition problems, or even water damage. In such cases, cloning the CAS module to a new one is often a faster and more cost-effective solution than repairing the original unit.
Locating the CAS Module
- In BMW vehicles: The CAS module is typically located at the bottom left side of the steering wheel.
- In MINI vehicles: The CAS module is found under the upper dashboard trim.
It’s important to note that there are different versions of the CAS module. Always check the markings on the case and the processor to ensure compatibility.
Common CAS Module Issues
CAS modules can fail for various reasons, including electrical faults, water damage, or wear and tear. For example, in one case, the ED07 diode burned out, damaging the circuit track. While repairs are possible, cloning the module to a new CAS3 is often a quicker and more reliable solution.
Disassembling the CAS Module
Disassembling the CAS module is straightforward. The module is held together by plastic latches, with no bolts or sealant to remove. Once opened, the board is coated with a protective varnish, which can be easily removed using a specialized liquid like Mechanic.
Cloning the CAS Module
The cloning process is similar across tools like Autel and Multiprog. The general steps involve reading the data from the old module and writing it to the new one. Here’s a breakdown of the process using two popular tools:
1. Using Xhorse MULTI PROG
- Method 1: Solder wires to specific points on the board. This method is quick and straightforward, taking about 5 minutes.
- Method 2: Use a special adapter for a solder-free connection.
MULTIPROG is known for its fast reading speed and user-friendly interface. It’s updated frequently, with the Xhorse team constantly adding new features.
2. Using Autel
- Autel offers flexibility, allowing you to work with either a computer or devices like the Autel IM508/IM508S/IM608.
- The Autel IM508S requires an additional resistor for connection, though some users have reported success without it. PC software does not.
- While Autel reads slightly faster than MULTIPROG, the difference is negligible. However, the PC version of Autel hasn’t seen updates in a while, and the IM508S requires an annual subscription for full functionality.
Read BMW CAS3 IMMO with Autel XP400 Pro PC software
Read BMW CAS3 IMMO with Autel IM508S/IM608
