Quick airmatic relay question
Thread Starter
Super Member
Joined: Jun 2014
Posts: 609
Likes: 19
From: Ontario
2005 E55
Quick airmatic relay question
Pulled 002 542 23 19 from car with 5 terminals. I have hella 4ra 007 791-01 to replace but there are only 4 terminals.
do I have the wrong replacement?
do I have the wrong replacement?
MBWorld Fanatic!
Joined: Jan 2014
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From: Republic of Texas
'99 and '05 E55 AMG
The answer is "It depends upon the application". A 5-pin relay has a Normally-Closed in addition to a Normally-Open connection. The Normally-Open connections are always on pin 87. So, techically it is the wrong relay but it might work; depends upon if the circuit needs to "see" a normally-closed connection.
Last edited by bbirdwell; Nov 6, 2017 at 02:27 PM.
MBWorld Fanatic!
Joined: Jan 2014
Posts: 3,969
Likes: 1,317
From: Republic of Texas
'99 and '05 E55 AMG
Looking at the schematic for an '05 E55, the K67 relay only uses 4-pins. Pin 87 is used to power the compressor, pin 87a shows as a no-connect. Power comes from a 40-amp fuse, location F74.
Power and ground for the solenoid in the relay come from pins 16 and 39 of the Airmatic module. I don't know which is power and which is the open-collector ground.
Hope this helps.
Power and ground for the solenoid in the relay come from pins 16 and 39 of the Airmatic module. I don't know which is power and which is the open-collector ground.
Hope this helps.
Last edited by bbirdwell; Nov 6, 2017 at 03:53 PM.
Thread Starter
Super Member
Joined: Jun 2014
Posts: 609
Likes: 19
From: Ontario
2005 E55
The green relay I pulled is a 5 prong but as far as I can tell the replacement relay ends with 1319 which equals the 9101 I have purchased but only a 4 pin. Grrr not sure what to do here or if the 4 vs 5 pin matters...
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