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Chevrolet Corvette: ,, 2005 corvette....NO FOBS detected.

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HI,, 2005 corvette....NO...
HI,, 2005 corvette....NO FOBS detected. the fobs would not open door but would beep horn. I looked in manual and followed instructions open trunk, turn key 5 times, press acc button and wait 10 min. press ass wait 10 min, and a third time....insert fob in slot in glove compartment ..hit acc button.....hear ticking for about 30 sec...then nothing...no sign of power in vehicle
Submitted: 2 years ago.Category: Chevy
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Answered in 1 hour by:
6/29/2015
Chevy Mechanic: Bill, Chevy Technician replied 2 years ago
Bill
Bill, Chevy Technician
Category: Chevy
Satisfied Customers: 1,776
Experience: GM Certified Master Technician
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Hello,
When you press the start button, do you hear one click or hear multiple clicks rapidly from behind the dash area?
Thanks
Bill
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Customer reply replied 2 years ago
multiple clicks
Chevy Mechanic: Bill, Chevy Technician replied 2 years ago
Have you checked battery voltage and condition? If the battery voltage is below approximately 11 volts, the remote control door lock receiver (rcdlr) will not power up properly and it can logic lock. Make sure the battery is tested and in good condition. If the battery is good and the vehicle will not power up when the remote is in the slot, and you are hearing multiple clicks, then we likely have a vehicle module communication issue. I've seen many rcdlr's fail and not communicate with the body control module. I've even had corvette's with water intrusion into the window motors (which is also a module with the data line going to it) and cause the modules not to communicate causing the same symptoms you are having. If the battery voltage is where it should be and the battery is good we would need a scan tool to read data from the modules involved in the keyless system which are the rcdlr, the body control module and the engine control module.
Bill
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Customer reply replied 2 years ago
I bought a battery charger and will do so later today.
Chevy Mechanic: Bill, Chevy Technician replied 2 years ago
Sounds good... let me know.
Bill
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Customer reply replied 2 years ago
battery fully charged, nothing happening, there is no evidence of power in the vehicle, no lights etc. I wonder if when I "re programed the FOBs this shut down the security system?
Chevy Mechanic: Bill, Chevy Technician replied 2 years ago
The question would be why would you have an issue in the first place. The vehicle will not just lose the memory of any programmed fob. Now if it were working properly and the battery was fully charged and THEN you programmed the system incorrectly I could see that. But from what you are telling me, the battery is fine and the fault simply happened out of the blue.
It appears from what you are telling me that the rcdlr is seeing the remote (remember the multiple clicks I asked about) but the rcdlr is not communicating with the body control module to power up the vehicle. We either have a body control module that has failed or something taking down the data line such as a wiring fault or any one of the modules on that data line. Remember above I mentioned I had the exact same symptoms because of a window motor failure. The owner of the vehicle thought I was crazy that a window motor could cause a no start but again... the data line goes to the window motors. When I took the door panel off and disconnected the window motor, the vehicle would start and run. I'm not saying yours is a window motor. I'm simply giving an example of how one component can affect others on a communication network. That is exactly what it is... a network. It could be anything from the window motor or body control module to the radio. I think we're going to need dealer level diagnostic tools here to isolate this one. If one of the modules has failed, it requires dealer level programming equipment to configure it anyway.
Bill
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Customer reply replied 2 years ago
I spoke with the deal and he said leave the battery charger on, replace FOB battery and see what happens, he said it sounds like the security system has entered the anti theft mode. I contacted a local auto shop to see if this did occur (anti theft mode) it was something they could correct. The local resource said they could
Chevy Mechanic: Bill, Chevy Technician replied 2 years ago
Even with a low fob battery it should have worked when the fob was in the compartment and it should not have given a no fob detected message. A security message is separate from no fob.
Bill
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Customer reply replied 2 years ago
so does it sound like the vehicle is in anti theft mode and need to be reset?
Customer reply replied 2 years ago
in other words I need a shop to fix, correct?
Chevy Mechanic: Bill, Chevy Technician replied 2 years ago
Anti theft mode would still power up the vehicle however it would not allow the vehicle to start. You are getting no fobs detected. That is not a security issue. It is a fob to rcdlr to body control module error.
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Customer reply replied 2 years ago
ok thanks
Chevy Mechanic: Bill, Chevy Technician replied 2 years ago
I'm sorry if that's not the answer you want to hear but based on what you are telling me I have to call them as I see them.
Bill
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Customer reply replied 2 years ago
thanks we I think we have narrowed it down
Chevy Mechanic: Bill, Chevy Technician replied 2 years ago
Based on the fact you are getting multiple clicks from the rcdlr (which is what you should get) I would suspect either the data network is down or the body control module has failed.
Bill
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