Originally Posted by
JohnN488
My first post after lurking and reading for quite a while, and of course it is looking for help from those that know these cars well. Car is a 2006 roadster with 74,000 miles and all worked correctly when daughter drove to work in morning but did not when she left to come home.
Here is a summary of the symptoms;
- Key fob is not unlocking doors, the lights will flash once/thrice when pushing unlock/lock, but that is only response
- Door key will unlock the drivers door only, no response anywhere else
- Console switch will lock both doors and trunk as it should, can hear locking pump in action when using this switch
- Electric top operation appears to be collateral damage as well, will just beep in protest when switch is hit (windows drop as normal when top unlatched)
I have spent quite a few hours searching here and trying to locate source of problem, but have not found anything yet. Here are my actions/thoughts thus far;
- Trunk is dry and locking pump looks great with no evidence of ever having been wet. It appears to operate correctly with console switch
- Key fob is communicating with the car as evidenced by lights flashing, so SKREEM is apparently communicating w/ fob & car
- Door key appears to connect directly to BCM based on diagrams found here, but does nothing other than unlock driver door
- Console switch also appears to connect directly to BCM and seems to work normally, so I infer that BCM can communicate with the locking pump
- I have pulled/checked/reinstalled fuses mentioned in threads here with no impact (#25, 34 & 37 by memory), battery terminals clean and tight with 12.9x volts at battery
It appears likely to me that maybe the BCM could be the culprit, but I really don't know how do diagnose from here and wiring diagnostics/repair is certainly not a strength for me. I am hoping someone here that is more knowledgeable can provide some advice & guidance. Thanks in advance for thoughts, opinions and advice.
You are right on all counts above except:
The door lock cylinder is wired to the SKREEM, the SKREEM, in all cases, tells the BCM what to tell the CLP/SSM to do.
You seem to understand this correctly:
The console switch is just another input to the BCM, which, again, tells the CLP/SSM what to do.
Fuses:
35 - Door Lock/FOB side of SKREEM
37 - Engine Start side of SKREEM
So the console switch locks and unlocks the doors but the Key Fob only flashes the turn signals?
And a key in the door only locks/unlocks that door?
If this is the case, I'd guess that one half of the SKREEM is not working at all. In the service manual, under the wiring chapter, look for "Power Door Locks" for a diagram of how the lock cylinder tells the SKREEM what to do, and how the SKREEM talks to the BCM. There are three wires running from the SKREEM to the BCM that convey what the SKREEM wants the CLP/SSM to do (and this also is how the SKREEM tells CLP/SSM to turn the alarm system on or off).