| Subject: | Revised Transmitter Programming/Synchronization Procedure |
| Models: | 1999 Chevrolet Corvette |
This bulletin is being issued to revise the Transmitter Programming/Synchronization
Procedure in the Keyless Entry sub-section of Body & Accessories in the
Service Manual.
Please use the following to replace the existing information in the
Service Manual.
Each transmitter has a unique Vehicle Access Code (VAC) that changes
every 5 seconds. If a transmitter or receiver is replaced, each transmitter
must be programmed to the vehicle's receiver. Entering a specific button sequence
on the DIC, up to three transmitters can be programmed into the receiver.
After programming the transmitters to the vehicle, the receiver will update
this code every 5 seconds in order to match the code programmed in
the transmitter.
The transmitter may not communicate or become out of synchronization
with the receiver if any of the following situations occur:
| • | The transmitter battery is disconnected. |
| • | The vehicle battery is disconnected. |
| • | The transmitter and the vehicle are separated for 2 weeks
or more. |
| • | The receiver is disconnected. |
Perform the synchronizing procedure if the transmitter does not communicate
or becomes out of synchronization with the receiver. If the transmitter and/or
receiver are replaced, perform the following programming procedure:
Programming Transmitters
- Turn the ignition to ON.
- Turn the radio to OFF.
- Press the RESET button in order to clear any IPC warning messages.
- Press and release the OPTIONS button on the DIC to scroll through
the display options until the IPC display is blank.
- Press and hold the RESET button for 3 seconds.
- Press the OPTIONS button until FOB TRAINING message is displayed.
Important: If the FOB TRAINING message cannot be display, check if the BCM is configured
with the correct RPO codes.
- Press the RESET button in order to begin the programming sequence.
The message HOLD LK + UNLK 1ST FOB will be displayed.
- Simultaneously press and hold the LOCK and UNLOCK buttons on the
first transmitter for 15 seconds. The IPC will indicate when that transmitter
is programmed and when to proceed to the next. Repeat this procedure for each
additional transmitter or press the OPTIONS button to exit.
Programming Cancellation
The receiver will cancel the programming sequence if any of the following
conditions occur:
| • | The program mode is exited through the DIC. |
| • | The ignition is turned to OFF. |
| • | The three transmitters have been programmed. |
| • | The RFA system has been in the program mode for longer than 2 minutes
and no transmitters have been learned. |
If the program mode is cancelled with less than three codes stored,
the receiver will only accept the codes just stored. If the program mode is
cancelled before any code is stored, the codes still remain valid.
The receiver retains all current access codes in memory if either of
the following conditions occur:
| • | A programming sequence is interrupted. |
| • | The battery is disconnected. |
Synchronizing Transmitters
Perform the following procedure if a transmitter cannot communicate
or becomes out of synchronization with the receiver:
- Move a programmed transmitter within range.
- Press the LOCK and UNLOCK buttons on the transmitter simultaneously
for 7 seconds.
- The horn will chirp once when the transmitter is synchronized.
Repeat this procedure for each additional transmitter if needed.
