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1995 W-140 S500 Sedan
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Discussion Starter #1
On the 5th Big boy Benz that I have out of my large collection. I have noticed that while in reverse the dual antennas are not rising up, any suggestions on where to start looking? Any suggestions are greatly appreciated.
 

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1994 S600 Coupe, 1995 S600 Coupe
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2,001 Posts
I'd start at the PSE under the back seat. The lines for backup assist should be red. I'd disconnect each, and try and pull a vacuum with a hand vacuum pump. If one line leaks, then it's either a leaky line, or the actuator has a leak. If both lines hold a vacuum, use a hand pressure pump to test them. It's possible for some actuators on the car to hold vacuum, but leak under pressure. I'm not sure if these actuators will fail that way or not.You have to pull the trunk side carpets to get to the actuators.

If everything after the pump holds pressure and vacuum, then either that circuit in the pump isn't working correctly, or the pump isn't getting the reverse signal. But it's more likely a leak somewhere in the system.

Jon
 
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