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86 560sec-168K -Ext. Light Ivory/Int. Black/01 E320 4Matic Wagon Brl Silver/Black/ Mad '95 Q45
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Discussion Starter #1
doors are opende no matter what i set the switch at ???
 

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1991 300SE
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1,435 Posts
Fuse? Bulb? Pull it out and check for voltage in the connector. And, check the contacts in the switch itself. If both doors don't work, I won't rule out both door switches being faulty. (last resort)
 

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86 560sec-168K -Ext. Light Ivory/Int. Black/01 E320 4Matic Wagon Brl Silver/Black/ Mad '95 Q45
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Discussion Starter #3
Jammerkiller said:
Fuse? Bulb? Pull it out and check for voltage in the connector. And, check the contacts in the switch itself. If both doors don't work, I won't rule out both door switches being faulty. (last resort)
the light itself works in all positions just not when open door
 

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1990 420sel
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324 Posts
Is this happening on all 4 doors, or just the driver's door? If it's just the driver's door it is your seat belt warning relay.
 

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1987 420SEL
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159 Posts
Seatblet warning might not actually be bad. A lot of people just unplug it when they get annoyed. Its up under the dash on the drivers side if you want to check it.
 

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rusty420 said:
Seatblet warning might not actually be bad. A lot of people just unplug it when they get annoyed. Its up under the dash on the drivers side if you want to check it.
Good thread for me, mine won't work on the drivers side door, replaced the switch with no luck. Gotta find this relay now . . .
 

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1988 Mercedes 300SE
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61 Posts
mine quit working the other day after I unpluged and removed my cruise conrtol amp and the relay attached to the top of the amp by a bracket. Is the seatbelt alarm relay associated with the relay on top of the cc amp?
 

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86 560sec-168K -Ext. Light Ivory/Int. Black/01 E320 4Matic Wagon Brl Silver/Black/ Mad '95 Q45
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Discussion Starter #9
rusty420 said:
Seatblet warning might not actually be bad. A lot of people just unplug it when they get annoyed. Its up under the dash on the drivers side if you want to check it.
Funny you say that my next new post was gonna be " why wont my seat belt warning lights stop blinkin' ???) please advise.
 

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1990 420sel
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324 Posts
bigdon said:
mine quit working the other day after I unpluged and removed my cruise conrtol amp and the relay attached to the top of the amp by a bracket. Is the seatbelt alarm relay associated with the relay on top of the cc amp?
Yes, the seat belt warning relay is the small relay attached to the cruise control amp. A malfunctioning relay will cause your interior lights to not turn on when opening the drivers side door. The lights will turn on however, when opening the passenger's door.
 

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86 560sec-168K -Ext. Light Ivory/Int. Black/01 E320 4Matic Wagon Brl Silver/Black/ Mad '95 Q45
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Discussion Starter #11
rph74 said:
Yes, the seat belt warning relay is the small relay attached to the cruise control amp. A malfunctioning relay will cause your interior lights to not turn on when opening the drivers side door. The lights will turn on however, when opening the passenger's door.
Seat belt light flashing, Lights do not go on when open drivers or passenger.
Where is relay, what do i have to do to make the lights stop, and my interior light to come on. does the front light come on or the rear or both. (i just remembered my rear light never came on , maybe no bulb , will check ).
 

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1988 Mercedes 300SE
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61 Posts
yeah, the passenger side door will activate the dome light. I'll live with it until my cc amp comes back from rebuild. Thanks for confirming my hunch.
 

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1988 Mercedes 300SE
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my relay was located under the driver's side dash, near my left shin. Mine is an '88 300se. It was attached to the top of the cruise control amplifier. The relay/cruise amp assembly is secured by a single bolt, and positioned almost vertically with the cannon plugs pointing toward the floor. If niether front door will activate the light, maybe check the bulb first? I'd suggest fuse, but there are normally a lot of components on each fuse, so unless you had a wave of electrical failures at the same time, probably not a fuse.
 

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1990 420sel
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324 Posts
jimmypop said:
Seat belt light flashing, Lights do not go on when open drivers or passenger.
Where is relay, what do i have to do to make the lights stop, and my interior light to come on. does the front light come on or the rear or both. (i just remembered my rear light never came on , maybe no bulb , will check ).

When you start the car without your seat belt on, do you hear a buzzer? The relay is what makes the buzzer sound. Bad relay, no sound. Just the front lights will turn on when opening the drivers door.
 

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86 560sec-168K -Ext. Light Ivory/Int. Black/01 E320 4Matic Wagon Brl Silver/Black/ Mad '95 Q45
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Discussion Starter #15
rear dome had blown bulb, will try tomorrow- front no matter what the switch is set on does not go on when either door is opened --- it does however go on on all 3 settings- independent of doors position.

YES - i hear the buzzing when insert key and crank....
Watch think ????
 

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86 560sec-168K -Ext. Light Ivory/Int. Black/01 E320 4Matic Wagon Brl Silver/Black/ Mad '95 Q45
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Discussion Starter #16
works now - fuse 15 was problem bad contact short prob solved
 
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