W209 (CLK) Wiper troubleshooting Question
Thread Starter
Junior Member
Joined: Aug 2016
Posts: 27
Likes: 2
From: San Clemente, CA
2009 CLK 350 Past: 2007 C230
W209 (CLK) Wiper troubleshooting Question
Hi,
Have a new to me CLK 350 with dead windshield wipers. I understand the process to diagnose is
1: Check fuse + power @ fuse box
2: check power @ Wiper Motor
3: Check Wiper relays
4: Check column switch
Question - How do I check the relays? There are two.
And how do I test the column switch?
Thanks!
Have a new to me CLK 350 with dead windshield wipers. I understand the process to diagnose is
1: Check fuse + power @ fuse box
2: check power @ Wiper Motor
3: Check Wiper relays
4: Check column switch
Question - How do I check the relays? There are two.
And how do I test the column switch?
Thanks!
Out Of Control!!
Joined: Sep 2018
Posts: 14,666
Likes: 4,568
From: unbegrenzt
2017 GLE350 4MATIC
A way to see if you have a bad relay is to buy a new one and see if it fixes the problem. Not strictly a test, but ruling out by process of elimination.
Another suggestion is to use a multimeter on the relay contacts in the fuse box/SAM. However I don’t know if some relay contacts need to be in place to test the circuit so this may not be 100% successful.
Can you pull the power connector off the motor and access the contacts with a multimeter?
Checking other items requires the wiring diagram to see where cables are terminated. Or pull the harness off the switch, if accessible, and use a multimeter.
Common theme here is a multimeter. I like my old Fluke, purchased about 10 years ago but it is the decades-old design.
Another suggestion is to use a multimeter on the relay contacts in the fuse box/SAM. However I don’t know if some relay contacts need to be in place to test the circuit so this may not be 100% successful.
Can you pull the power connector off the motor and access the contacts with a multimeter?
Checking other items requires the wiring diagram to see where cables are terminated. Or pull the harness off the switch, if accessible, and use a multimeter.
Common theme here is a multimeter. I like my old Fluke, purchased about 10 years ago but it is the decades-old design.
Thread Starter
Junior Member
Joined: Aug 2016
Posts: 27
Likes: 2
From: San Clemente, CA
2009 CLK 350 Past: 2007 C230
A way to see if you have a bad relay is to buy a new one and see if it fixes the problem. Not strictly a test, but ruling out by process of elimination.
Another suggestion is to use a multimeter on the relay contacts in the fuse box/SAM. However I don’t know if some relay contacts need to be in place to test the circuit so this may not be 100% successful.
Can you pull the power connector off the motor and access the contacts with a multimeter?
Checking other items requires the wiring diagram to see where cables are terminated. Or pull the harness off the switch, if accessible, and use a multimeter.
Common theme here is a multimeter. I like my old Fluke, purchased about 10 years ago but it is the decades-old design.
Another suggestion is to use a multimeter on the relay contacts in the fuse box/SAM. However I don’t know if some relay contacts need to be in place to test the circuit so this may not be 100% successful.
Can you pull the power connector off the motor and access the contacts with a multimeter?
Checking other items requires the wiring diagram to see where cables are terminated. Or pull the harness off the switch, if accessible, and use a multimeter.
Common theme here is a multimeter. I like my old Fluke, purchased about 10 years ago but it is the decades-old design.
