Key Fob Works Intermittently
12-19-2017, 01:40 PM
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2003 C32 AMG
Key Fob Works Intermittently
I have a 2003 C32 with 140K miles. My key fobs work intermittently. I have been able to find that they work immediately after I leave the car and for about an hour after that. All functions work and the key always works in the ignition. When they don’t work I can put the keys in the ignition and remove it and it works all the functions again for a while. What I have done to date:
1. Replaced batteries in both fobs
2. Fobs’ lights blink when buttons pushed
3. I don’t see the infrared light with my phone camera on either fob even when the key fobs work the doors
4. I replaced my car battery because I would check the MB volt meter when the fobs did not work and found it consistent with a reading below 12 volts. A volt meter across the battery shows about 12.3 volts.
5. I have re synchronized the key fobs as a last resort but with no change in how they operate
I don’t understand why the system would work always after I leave the car but fails after the car sits.
Any ideas for fixes or diagnosis would be greatly appreciated.
1. Replaced batteries in both fobs
2. Fobs’ lights blink when buttons pushed
3. I don’t see the infrared light with my phone camera on either fob even when the key fobs work the doors
4. I replaced my car battery because I would check the MB volt meter when the fobs did not work and found it consistent with a reading below 12 volts. A volt meter across the battery shows about 12.3 volts.
5. I have re synchronized the key fobs as a last resort but with no change in how they operate
I don’t understand why the system would work always after I leave the car but fails after the car sits.
Any ideas for fixes or diagnosis would be greatly appreciated.
