Quote:
Originally Posted by msultani
It’s been awhile since my comfort access stopped working...:
Key fob, door handles nor keyless start does not work. So far I have done: replaced battery, replaced key fob battery, manually checked all fuses (don’t have diagram). My dealership is a complete rip off, $200 just for diagnostics. [what were Dealer's diagnostic findings -- Fault Codes, Test results, etc.??] I only have 1 key fob. One time my key worked at the bottom of my drivers side rear bumper, weird as hell right? I can only start my car with the key fob inserted and use the actual key to open the doors. No engine or trouble codes on dash. [Any fault codes would be in CAS or Comfort Access Control Unit] I’ve looked through the forums and tried other solutions but no avail. Any suggestions would be amazing!
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If you don't have INPA/ISTA or other BMW-specific software/scan tool that can read Fault codes in module other then the DME, a multimeter, patience to follow circuit diagrams, etc., best to simply take it to an Independent shop that HAS that equipment. I do NOT have CA and can't offer personal experience other than simply identifying and interpreting TIS schematics.
However, if it suddenly quit working one day and then NADA, except perhaps once working at the rear bumper antenna (actually NOT weird as there is an antenna there) and changing the battery in your remote did NOT help, then that suggests a system problem in the car that prevents the system from detecting the signal produced by your remote key, rather than a problem with the key radio signal. Obviously the key chip works fine as you can insert key in slot and start car.
A Dealer should have the ability to test for signal sent by CA remote key. Did they NOT do that, and/or NOT explain to you the result of that test? Do you have any written receipt or invoice stating what tests were performed and the results, Fault Codes, etc.? Any Electronic Module has INPUTS (antenna signals in this instance) and OUTPUTS (here to unlock, activate ignition, etc.) and INPA/ISTA can tell you if (1) the module is responding to connection via the OBD II Socket, (2) read "Inputs" such as any signal received from the remote key, and (3) Activate the system by producing "Outputs" to unlock or activate the ignition. That is the easiest way to test the functionality of the system and get clues on what is NOT working as intended, as well as to read Fault Codes or Freeze Frame Data saved in Module Memory.
You might get lucky and be able to test the system yourself simply using the circuit diagrams & a multimeter. For instance, here is the TIS circuit diagram for the CA Control Unit, "A215" in this link:
https://www.newtis.info/tisv2/a/en/e...ess/1VnXU4jrfZ
Start by checking fuse F61 (5A) which is the top fuse in the 2nd column from the left, F57 being at the bottom of that column as shown in this TIS "Installation Location":
https://www.newtis.info/tisv2/a/en/e...cab/1VnYo8ECDO
There should have been a "trifold" attached to the removable panel of your glovebox, but I'll attach two pages from Bentley that show 2008+ fuses to the next post (so as NOT to mess up margins in this post).
Here are other TIS resources if you decide to tackle it yourself:
Convenient Access System Inputs:
https://www.newtis.info/tisv2/a/en/e...access/unjV9QB
Comfort Access Functional Description:
https://www.newtis.info/tisv2/a/en/e...access/XPJiwrn
Installation Location of Comfort Access Control Module (A215):
https://www.newtis.info/tisv2/a/en/e...i-cab/HOtUza7g
Installation Location of Aerial Diversity, A421:
https://www.newtis.info/tisv2/a/en/e93-335i-cab/RaC3fJu
Please let us know what you find,
George