your voltage regulator is stuck ,if it's still factory equip , if not the diode in the alt. is bad.
You can reset a 1994 Mercedes S factory alarm by disconnecting and reconnecting the battery. When the battery is reconnected within 20 seconds turn the ignition on.Ê
you need to go to the dealer and get the factory code to reprogram it
I had this problem a month ago. After I disconnected the battery to clean it, the alam went off when it was reconnected. The owner manual said it would be turned off when the van is unlocked with the key or remote control. This did not work. If you have a valet switch (a small toggle switch under the dash) you place the key in ACC or ON and turn the switch to the opposite position. Hope that helps.
If your battery has been disconnected recently (and therefore your radio has been reset), you may find the code has reverted to the factory setting: 1111.
Update: I disconnected the battery, touched the connectors together, and reconnected it: now it's just displaying the time, whereas before it was displaying all but the volume bars (between the '-' and '+'). Argh! Please help. Also, the red "alarm" LED isn't blinking... never has. Maybe my buttons are broken? Maybe the guys at the dealer Armor-All'd inside the face?
Tried the suggested key tricksy with no joy. Disconnected battery cable for 10 min. After re connect, all back to normal
There is nothing to reset. You already reset the PCM back to factory settings when you disconnected the battery to replace it. Now you must drive the vehicle normally so it will relearn your driving habits, conditions you drive under, climate, etc.
This does come with a factory amplifier for the sound system. Sometimes it comes disconnected and needs to be reattached.
It is under the hood near the battery. If you pull the battery out and look at the inside corner, you'll see the starter relay. The top lug is the input from the keyswitch (and transmission safety switch, etc). The lug closest to the headlight is the input from the battery, and also has ring terminals that feed the rest of the electrical systems (yellow wires). The lug closest to the passenger door is the output to the solenoid. From the factory, there is a funky Y-shaped boot that connects the two lower terminals (battery positive and solenoid coil) that attach to that relay.
The factory alarm is part of the engine and body computers, it can not be disconnected.
The factory alarm is an integral part of the engine and body computers. It can not be disconnected.