How can I repair my Mercedes SLK 230 overload protection relay?
A brass clip (green arrow) keeps the K40 in place. Pressing it outward sets the K40 free. Pull the plugs off the K40 and remove it from the car. A skinny flathead screwdriver can be used to pry the relay board out of the case. Check the relay side of the board for obvious problems: charred or loose connections, etc.
Where is the K40 relay on a SLK 230?
If those lead to dead-ends, the K40 is worth scrutinizing. The K40 relay is located in the control module box, under the hood. In left-hand-drive R170 SLKs, this box is near the exhaust manifold. A heat shield and a blower motor keep the electronics in the box cool.
Why is my Mercedes SLK 230 not working?
A non-functioning blower can be a root cause. With the ignition switched on, this fan is audible, and airflow should be felt with the control module’s cover removed. Visual inspection of the K40 might reveal a correctable flaw.
A brass clip (green arrow) keeps the K40 in place. Pressing it outward sets the K40 free. Pull the plugs off the K40 and remove it from the car. A skinny flathead screwdriver can be used to pry the relay board out of the case. Check the relay side of the board for obvious problems: charred or loose connections, etc.
A non-functioning blower can be a root cause. With the ignition switched on, this fan is audible, and airflow should be felt with the control module’s cover removed. Visual inspection of the K40 might reveal a correctable flaw.
If those lead to dead-ends, the K40 is worth scrutinizing. The K40 relay is located in the control module box, under the hood. In left-hand-drive R170 SLKs, this box is near the exhaust manifold. A heat shield and a blower motor keep the electronics in the box cool.
When does a Mercedes slk230 K40 fail to restart?
First, the customer complaint: car runs great, no problems, but it will occasionally die and fail to restart. About 15-20 minutes later, it will usually start and all is well until it does it again. Vehicle usually has to be driven 20 minutes or so before failure will occur.
Where is the K40 overload protection relay located?
Troubleshooting should obviously begin with any diagnostic trouble codes (DTCs), followed by checking for blown fuses. If those lead to dead-ends, the K40 is worth scrutinizing. The K40 relay is located in the control module box, under the hood. In left-hand-drive R170 SLKs, this box is near the exhaust manifold.
Troubleshooting should obviously begin with any diagnostic trouble codes (DTCs), followed by checking for blown fuses. If those lead to dead-ends, the K40 is worth scrutinizing. The K40 relay is located in the control module box, under the hood. In left-hand-drive R170 SLKs, this box is near the exhaust manifold.
Why did my Mercedes-Benz K40 relay module fail?
But it does sound like the K40 – although failures were rare on the facelift models. The fault was the K40 relay module, as suspected. I replaced the whole module, but it was probably a failure of the relay controlling the fuel pump (2nd from left when viewed from the side with the fuses).
How do you test a car relay with no power?
If there is no power, the electrical system must be tested starting with the fuse then the relay. If power is present use the test light connected to battery power to check the ground circuit. if these tests check out, the accessory is bad and needs to be replaced.
Why is my Mercedes K40 relay module not working?
Google to the rescue! Upon looking at a few articles online and checking out a few diagnostic websites, I concluded that it was likely a failure of the “K40 Relay Module.” *Remember to always disconnect the negative battery cable prior to any kind of electrical service.