WIS 80.57 Drive Authorization System: Difference between revisions

Revision as of 02:42, 7 July 2015

Tip for Using Mechanical Key

Turn it all the way to the left (CCW).

Weak Batteries in Remote Key Fob

The function may be affected by weak batteries in the key. If your key will not lock and unlock the car from 10 m (30ft) or more, your batteries are weak and that will compromise the strength of the IR beam. Try changing the batteries in the key before you go to more complicated (and expensive) efforts at restoring the function.

Batteries

2003 Update S500L Remote Key Fob has two batteries ie CR2025 x 2

2005 S500 Keyless Go Fob has only 1 Battery #2025

How To Change Batteries - Remote Key Fob

http://www.mbworld.org/forums/audio-...-pictures.html

Issue where Remote Control Key Will Not Rotate/Work/Turn in EIS (EZS)

Issue

Normally after inserting the correct Remote Control Key in the ignition lock (Electronic Ignition/Starter Switch (EIS) control module (N73)) it will turn instantly to position 1 (accessories), 2 (ignition on) and position 3 (engine start). However it seems that a common fault in the W220 occurs whereby the correct key will unlock the doors but once inserted in the ignition will not rotate and appears frozen. The vehicle cannot be started while the key will not turn.

Temporary Solution

The frozen key often happens intermittently causing huge frustration when out travelling. If you are lucky it may eventually start working again after continually trying and waiting twenty minutes. It is presumed that the EIS warms up slightly during this process.

Some owners have successfully used hair driers and electrical heaters to pre-warm the area around the ignition switch (EIS) to get the car started. Of course this is not a permanent fix but may get you out of immediate trouble.

The Failure

It is now apparent, thanks to several BenzWorld Members and especially YouTube Poster John Kennedy, that one of the microprocessor chips on the EIS becomes sensitive to cold temperatures. Warming this particular chip temporarily solves the problem until it cools down sufficiently again.

Investigation

The link shows one investigation with the bottom line that it was not a DIY solution. (Later note: YouTube Poster John Kennedy shows that a DIY fix is now possible.)

Parts of a W220 Remote Control Key
How the Remote Control Key Works in a W220
Diagnosing An Intermittent Key
Testing EIS Induction Power Generator Output
Test of Induced Voltages In Actual OEM Remote Control Key
Removing the EIS

http://www.benzworld.org/forums/w220-s-class/1300215-cold-weather-electronic-key-problems-5.html

Expensive Solution

The easiest but extremely expensive solution is to replace the EIS with a new one. It will cost over $3,000 and requires reprogramming of the new EIS to match the vehicle. As this is deemed a safety/security issue it can only be done by an authorized M-B agent.

DIY Solution

With a huge acknowledgement to YouTube Poster John Kennedy whose excellent diagnosis shown in the video below positively demonstrates a faulty microprocessor which caused the issue.

In his case the fault was due to the lower Hc08 microprocessor chip (4j74y), shown in the next figure.

This microchip was very sensitive to cold temperature, shown here being cooled with a can of freezer solution. Once cooled the key freezes in the lock and will not turn.

Warming the culprit chip, just with applied finger warmth for a few seconds, solves the issue and the key will turn again.

John Kennedy reports that the issue was fixed by replacing the faulty microprocessor.

Diagnosing W220 EIS by John Kennedy

Reference: https://www.youtube.com/watch?v=8JTbSrgwbWg&feature=youtu.be

Warning

Be aware that in other cases it may not be the microprocessor chip shown in this article that fails so some diagnosis as per the video will be necessary to thoroughly isolate the faulty component.

Also be aware that working with electronic components requires some specialized skills such as fine soldering technique and appropriate earthing techniques to aid in prevention of electrostatic discharge. Surface mount electronic components can be very sensitive to excess heat and static electricity.

Everything you ever wanted to know about the Drive Authorisation System (DAS) and Keys

Information gathered from various official MBZ sources, included technical documentation, service documents, and even authorized technicians and factory personnel, by BenzWorld Member rudeney.

http://www.benzworld.org/forums/w163-m-class/1245088-everything-you-always-wanted-know-about.html

Programming W220 Remote Control Key

This video instruction is suitable for Car Key Master: CKM-100(PC Version) and CKM-200(Handhold Version), also it is suitable for Digimaster 3.

Part 1: http://www.youtube.com/watch?v=nKTab4Yxeds&feature=youtube_gdata_player

Part 2: http://www.youtube.com/watch?v=8TZh9p9sIuw&feature=relmfu