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  #1  
Old 05-27-2001, 01:07 PM
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My cruise control has failed the test for the switch located at the steering column. I am getting no current at all at the male connector for the amplifier. Fuses seem to be OK. Is there a component (relay) between the fuse and switch that might have failed or is it likely that something is wrong with the wiring in the steering column or the switch itself?

Smiles.

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1993 190E 2.3
2000 Toyota 4x4 Tundra
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  #2  
Old 05-27-2001, 06:50 PM
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Earl,

Check your tail light bulbs to make sure they are the correct European wattage ones. An American bulb can cause your cruise control to malfunction. If in doubt, replace all your bulbs with Osram ones, found at any good European independent shop or MB dealer.
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  #3  
Old 05-27-2001, 10:11 PM
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I am looking at the schematics for the cruise control and the switch is getting straight current at terminal #15 trough the connector at the stop lamp switch which is located at driver's
footwell. Power is coming to the switch from fuse #5.
The wire color is red at the cruise control switch and then it splits into black/red/violet (going to the x20 connector at the lamp switch) and black/red/white (leading to the amplifier?s terminal #15). There is also a note here: For cruise control to be engaged, terminal 8 (on amplifier) must sense ground. When stop lamp switch is closed, ground is electrically removed. Hope this helps somewhat.

Alex



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Old 05-27-2001, 10:42 PM
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Ok Alex... Thanks. It does help. Gives me a lead to follow. I want to check out that stop light switch...and its relation to pin 8.

I got current to the switch now and it is working fine. Pulled the steering wheel and switch and ran checks on the wiring down to the female terminal of the amplifier.

For some reason I am getting battery voltage at pin 11 when I plug the amp into the female terminal (speed sensor test). According to directions I should only get 2 volts at 25 mph. This may indicate a direct short.

Any Idea where the speed sensor is located?

My info says its a "Hall-effect speed sensor B6".
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1993 190E 2.3
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Old 05-28-2001, 12:40 PM
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I'm not sure about the oldr model Benzs, but on my 1997 C36, if the tire diameter is not the same as stock, my cruise failed abover 120km/hr.

I had winter tires on adn tried it and it doesn;t work but after i put my summer ones on...viola..fixed.

Found this out when i took it back to the dealer to see what wrong. Took them 4 hours to figure that out and wanted to charge me for the 4 hours. I complained to the service manager and all he could basically give me was the finger. Sad but true.
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  #6  
Old 05-12-2002, 11:29 AM
RogerR
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The cruise control and tach are both inoperative on my '93 300D, and I wonder if the Hall-effect sensor could be out? Does it affect both? Also, where is a good source for repair manuals and schematics? Thanks.
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  #7  
Old 05-12-2002, 12:34 PM
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Speed sensor should be at the speedometer itself. Connection located on the back of the instrument cluster.
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