EDIT: The following only applies to ROW 300TDi Discoveries. North American Discoveries do not have a spider to bypass.

A common problem with the Discovery 1 and Range Rover Classic is unwanted immobilization due to a security system fault, or failing immobilization control unit. These are sealed and fail often due to broken solder joints and relays. The part is no longer available but can be fixed by opening the case and reflowing broken solder joints.

Fortunately the EICU can be bypassed with part AMR4956 (available from Rovers North), which simply connects input pins to output pins on the EICU harness. Of course, you could create your own using the same logic.



LAND ROVER PARTS - HARNESS 300 TDI KIT RANGE ROVER/DISCOVERY I

 

Very nice.

 

Like here (schematics and photo attached) - may be one other jumper needed.

 

Great write up!

 

What exactly does this do. Does it stop the alarm from going off? Does it let the doors work, Does it stop the immobilizer from killing the vehicle?

 

It only stops immobilization. The alarm and locks work the same.

 

Here's the DIY fix.
Alarm Spider Fix

 

For 20 Bucks, that is hard to beat.

 

Nice, if only it were this easy to fix my door locking and alarm issues! I haven't locked my doors in months because I was getting too many false alarms...

 

I have not yet had problems with this on my 97'Disco I (154k miles). Can someone tell me if historically the problems have been more on the diesel units or should i expect and be prepaired for the same nightmare on my V8.

And, will the bypass unit "AMR4956" work on the gasoline units. My Disco I stays and is used most at the deer lease and there would be no way to get any parts of any kind so I'm just trying to gather some "critical" parts to have on hand in case of a breakdown in the woods.

Thanks for Looking and I appreciate any and all advice!

RC