E-Class (W124) 1984-1995: E 260, E 300, E 320, E 420, E 500 (Includes CE, T, TD models)

Relay clicking

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Old Mar 22, 2023 | 02:47 PM
  #1  
Cliff Johnson's Avatar
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From: NE GA mountains
1994 E320 Cabriolet, 1995 e320 Wagon
Relay clicking

1994 e320 cab.... Replaced a dead battery, car started fine. But, a relay behind the fuse box started clicking constantly... even when the car was turned off. All functions in the car seem to work fine.... lights, turn signals, wipers, AC/heat.

I tracked the sound to the 6-pin "multi-function relay". Found the model # and ordered a $50 replacement . Replaced the relay and that seemed to have solved the issue as the clicking stopped.... though only temporarily.

But, the next time I started the car, the clicking started again. The only way to get it to stop is to disconnect the battery or remove Fuse #9. Wondering if Fuse 9 is a clue?
If I remove that fuse, the clicking stops. The car starts and runs fine, but the Radio and interior lights do not work... and maybe other features.

Any ideas would be highly appreciated.

Thanks in advance!
Cliff
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Old Mar 23, 2023 | 11:37 AM
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'93 300ce's Avatar
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From: San Diego, CA or Sequim Washington USA
'95-E320 COUPE, 2000 SL500, 2002 ML320
Test your antenna, unplug it, and retest.

Last edited by '93 300ce; Mar 23, 2023 at 01:30 PM.
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Old Mar 23, 2023 | 12:24 PM
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Cliff Johnson's Avatar
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From: NE GA mountains
1994 E320 Cabriolet, 1995 e320 Wagon
Will do. Thanks!!
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Old Apr 7, 2026 | 01:34 PM
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NDavies4's Avatar
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From: London
300CE 24 Cab
Did you get anywhere with this Cliff?

Originally Posted by Cliff Johnson
1994 e320 cab.... Replaced a dead battery, car started fine. But, a relay behind the fuse box started clicking constantly... even when the car was turned off. All functions in the car seem to work fine.... lights, turn signals, wipers, AC/heat.

I tracked the sound to the 6-pin "multi-function relay". Found the model # and ordered a $50 replacement . Replaced the relay and that seemed to have solved the issue as the clicking stopped.... though only temporarily.

But, the next time I started the car, the clicking started again. The only way to get it to stop is to disconnect the battery or remove Fuse #9. Wondering if Fuse 9 is a clue?
If I remove that fuse, the clicking stops. The car starts and runs fine, but the Radio and interior lights do not work... and maybe other features.

Any ideas would be highly appreciated.

Thanks in advance!
Cliff
Just started having the exact same issue with my 1993 300CE-24 cabrio. Did you get to the bottom of this (or can anyone else advise pls)?
KR, Neil
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