W209 (CLK) Wiper troubleshooting Question
06-24-2019, 01:59 PM
#1
Junior Member
Thread Starter
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!
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biker349 (06-26-2019)
06-25-2019, 01:17 PM
#2
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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.
The following users liked this post:
biker349 (06-26-2019)
06-27-2019, 12:13 PM
#3
Junior Member
Thread Starter
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.
