Is it dangerous to drive with a faulty CAS module?

This typically prevents starting entirely rather than creating a driving hazard, but if it causes intermittent loss of power while driving, that would be dangerous — have this diagnosed promptly either way.

Can a used CAS module be fitted from another vehicle?

This requires careful matching and specialist programming — sourcing and fitting the wrong module or one not properly synchronised can leave the vehicle unable to start.

What is the module made of?

A sealed electronic circuit board with secure key-authentication circuitry.

What is this part and what does it do?

Full description available in the product description section above. Contact us with clarifying questions.

How do I tell if my part is faulty?

See the 'Signs of a faulty part' section above or run a diagnostic at an auto service.

Yes - all our used parts are tested before sale and sold with guaranteed quality.

When should the part be replaced?

When warning signals appear, diagnostic codes are present, or the system malfunctions.

CAS control unit BMW 6 E63 645 2004

Name: CAS control unit BMW 6 E63 645 2004
Brand: BMW
SKU: 61356943854
Price: 54.00 EUR
Availability: InStock

OEM: 61356943854

Disassembled car photo

Engine running

Tested before shipping
Guaranteed quality
Fast delivery 3–7 days
14-day returns

What is this part and why does it matter?

The CAS (Car Access System) module manages keyless entry, ignition authorisation, and the immobiliser function on many BMW and compatible vehicles.

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Not sure about compatibility? Send us your car's VIN and we'll confirm.

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Signs of a faulty part

If you notice any of the following, the part likely needs replacement:

Vehicle won’t recognise the key or start
Central locking or keyless entry not functioning
Diagnostic fault code related to the module itself

Installation information

Mounted in the dashboard or engine bay, connecting to the vehicle wiring harness — requires specialist programming to match the specific key(s) after replacement.

Donor vehicle description

VIN: WBAEH710X0B293039
Make, model: BMW 6 E63
Year: 2004
Engine: Benzīns 4.4i 245KW N62B44A
Transmission: Automāts 6-pārnesumu
Drive: Aizmugurēja
Colour: STRATUS METALLIC (440)

306 parts from this car

Frequently asked questions

This module is deeply tied to the vehicle’s security system and often needs to be synchronised with the engine control unit and specific keys, requiring specialist diagnostic equipment and, in some cases, dealer involvement.

What our customers say

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Price: affordable. Service: electrical equipment repair.
A
Andris B.
September 2026
Price: excellent.
D
Didier V.
August 2026
Super good! They came through with the part I needed, quickly and at a fair price! Thanks, and I definitely recommend!
I
Ilmars K.
August 2026
I ordered a Heater Blower Motor Resistor for a Toyota Avensis. Delivery took eight days from Latvia to Ireland. I installed it, and everything works perfectly. I wish this company success.
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Aleksandr L.
Toyota Avensis
August 2026
No complaints about Evro Trans itself, everything's fine. But the delivery..... It felt like the order was being carried by turtles. 4 days from Riga to Daugavpils. Judging by the tracking, the parcel just sat somewhere behind a shed for 3 days, then they found it and delivered it the next day. I think that's why I won't be ordering there again.
P
Paul F.
June 2026
Super fast delivery of the part, and good quality of the used part. Thanks for the service.
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Natālija I.
May 2026
I ordered antifreeze heaters and an auxiliary pump. Everything arrived quickly, the very next day, and matched the description. I'm satisfied.
J
Juris J.
February 2026
Excellent service, timely delivery, and complete transparency at every step. I highly recommend EvroTrans to anyone looking for a reliable partner!
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Egor S.
November 2025
Bought a front fender for my car. I liked it! After payment they sent more than 20 photos of the problem areas, and it was packed very securely - took a while to unwrap.
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Igors K.
Front fender
October 2025