Side view mirror heater
Thread Starter
Member
Joined: May 2016
Posts: 130
Likes: 23
From: Ontario, Canada
06 MB E350 4Matic Sedan, 08 MB S550 4Matic Sedan
Side view mirror heater
Hi everyone,
The passenger (right) side view mirror heater does not work. However, it adjusts its position.
The rear window defogger works. The left side view mirror fully works (adjusts its position and heats up).
I checked the green 30 Amp fuses (left and right side mirrors) in the fuse box. They are fine.
I checked the voltage on the two tiny wires at the back of the mirror glass after tilting it down. The voltmeter reads 5.5 V - 5.6 V when the car runs in idle.
Why is it not heating up now? It worked fine last winter. What is wrong?
Thank you,
Pitek
The passenger (right) side view mirror heater does not work. However, it adjusts its position.
The rear window defogger works. The left side view mirror fully works (adjusts its position and heats up).
I checked the green 30 Amp fuses (left and right side mirrors) in the fuse box. They are fine.
I checked the voltage on the two tiny wires at the back of the mirror glass after tilting it down. The voltmeter reads 5.5 V - 5.6 V when the car runs in idle.
Why is it not heating up now? It worked fine last winter. What is wrong?
Thank you,
Pitek
Super Member
Joined: Apr 2007
Posts: 633
Likes: 48
From: USA
2006 E320 CDI
Hi everyone,
The passenger (right) side view mirror heater does not work. However, it adjusts its position.
The rear window defogger works. The left side view mirror fully works (adjusts its position and heats up).
I checked the green 30 Amp fuses (left and right side mirrors) in the fuse box. They are fine.
I checked the voltage on the two tiny wires at the back of the mirror glass after tilting it down. The voltmeter reads 5.5 V - 5.6 V when the car runs in idle.
Why is it not heating up now? It worked fine last winter. What is wrong?
Thank you,
Pitek
The passenger (right) side view mirror heater does not work. However, it adjusts its position.
The rear window defogger works. The left side view mirror fully works (adjusts its position and heats up).
I checked the green 30 Amp fuses (left and right side mirrors) in the fuse box. They are fine.
I checked the voltage on the two tiny wires at the back of the mirror glass after tilting it down. The voltmeter reads 5.5 V - 5.6 V when the car runs in idle.
Why is it not heating up now? It worked fine last winter. What is wrong?
Thank you,
Pitek
Last edited by ot1; Oct 25, 2018 at 09:41 AM.
Thread Starter
Member
Joined: May 2016
Posts: 130
Likes: 23
From: Ontario, Canada
06 MB E350 4Matic Sedan, 08 MB S550 4Matic Sedan
disconnect the two wires for the heater and measure the resistance, and post back your reading. Measure the other side and you will see that it has 12v. You can measure its resistance for comparison. Since you likely will be needed new glass, somebody here said there is european curved glass available from mercedes which will give a wider view.
Resistance reading
After disconnecting and removing the mirror glass I checked the resistance. It read 98.6 Ohms. Also, I checked the voltage on the two hanging from the mirror case wires. It read 12.6 V on the idly running motor.
Finally, I checked the continuity on the two tiny terminals on the back of the mirror glass. No beep = no continuity.
I have not checked the left (driver's side) mirror for resistance yet. It got quickly so dark after work. I will do it tomorrow.
So, what is the verdict so far? Anyone?
Thank you,
Pitek
Super Member
Joined: Apr 2007
Posts: 633
Likes: 48
From: USA
2006 E320 CDI
Resistance reading
After disconnecting and removing the mirror glass I checked the resistance. It read 98.6 Ohms. Also, I checked the voltage on the two hanging from the mirror case wires. It read 12.6 V on the idly running motor.
Finally, I checked the continuity on the two tiny terminals on the back of the mirror glass. No beep = no continuity.
I have not checked the left (driver's side) mirror for resistance yet. It got quickly so dark after work. I will do it tomorrow.
So, what is the verdict so far? Anyone?
Thank you,
Pitek
