After replacing key cylinder cannot program new key

Hi,

There are two ways to reprogram this. First requires a scan tool and the other takes about 30 minutes. I am going to provide the directions for doing it without the scan tool. If this is what you have already done, let me know.

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30 Minute Re-Learn Procedure
Use this procedure after replacing lock cylinders, Passlock Module/BCM or the PCM (if necessary - see note above).
1. Turn ON the ignition, with the engine OFF.
2. Attempt to start the engine, then release the key to ON (The vehicle will not start).
3. Observe the Security telltale, after approximately 10 minutes the telltale will turn OFF.
4. Turn OFF the ignition, and wait 5 seconds.
5. Repeat steps 1-4 two more times, for a total of 3 cycles and 30 minutes. The vehicle is now ready to relearn the Passlock Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK.

IMPORTANT: The vehicle learns the Passlock Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.

6. Start the engine. (The vehicle has now learned the Passlock Sensor Data Code and/or password.)

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Let me know if this helps.

Joe

Hi,

Was the cylinder replaced because you lost the lost the key or was it damaged? Take a look through these directions and let me know if this is what you did.

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2000 Chevrolet Impala V6-3.8L VIN K
Ignition Switch Lock Cylinder - Dash Mounted
Vehicle Starting and Charging Sensors and Switches - Starting and Charging Ignition Switch Ignition Switch Lock Cylinder Service and Repair Removal and Replacement Ignition Switch Lock Cylinder - Dash Mounted
IGNITION SWITCH LOCK CYLINDER - DASH MOUNTED
IGNITION SWITCH LOCK CYLINDER REPLACEMENT

REMOVAL PROCEDURE

IMPORTANT: Perform the body control module (BCM) theft deterrent relearn procedure whenever you replace the ignition switch lock cylinder.

1. Disconnect the negative battery cable.
2. Remove the instrument panel (I/P) cluster trim plate.

Pic 1

3. Insert the key and turn the ignition lock cylinder to the ON/RUN position.
4. Using a small curved tool or an L-shaped hex wrench, depress and hold the detent on the ignition lock cylinder. Access the detent by placing the tool through the I/P opening to the right of the ignition switch. If you cannot locate the detent with the tool, lower the ignition switch away from the I/P. Refer to Ignition Switch Replacement.

Pic 2

5. Using the key as an aid, pull to remove the lock cylinder from the switch.
6. Remove the key from the lock cylinder.
7. If the cylinder does not rotate or is seized, follow the procedure in the ignition switch replacement. Refer to Ignition Switch Replacement.

INSTALLATION PROCEDURE

pic 3

1. Code the ignition lock cylinder, if necessary. Refer to Key and Lock Cylinder Coding.
2. Insert the key and turn the lock cylinder to the ON/RUN position.
3. Position the lock cylinder to the ignition switch. Press the cylinder into place. If you turned the key slightly while removing the lock cylinder, you may have to align the white colored ignition switch rotor (1) with the lock cylinder (2). You can rotate the ignition switch rotor (1) with your finger.
4. Turn the key to the OFF position and remove the key.
5. Install the I/P cluster trim plate.
6. Connect the negative battery cable.
7. If you installed a new lock cylinder, perform the BCM theft deterrent relearn procedure.

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Let me know.
Joe

Hi,

The problem is likely a connection issue. Take a look through the attached diagnostic flow chart and let me if anything helps. Also, if there are any diagnostic trouble codes, let me know what they are.

This information correlates with the attached flow chart.

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2000 Chevrolet Impala V6-3.8L VIN K
Diagnostic System Check
Vehicle Accessories and Optional Equipment Antitheft and Alarm Systems Testing and Inspection Initial Inspection and Diagnostic Overview Diagnostic System Check
DIAGNOSTIC SYSTEM CHECK
A Diagnostic System Check - Theft Deterrent

Pic 1

DIAGNOSTIC AIDS
Use J 35616-A when probing or testing electrical connector terminals. Refer to Testing for Intermittent and Poor Connections.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
4. The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.

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Let me know.

Joe

Hi,

It's possible, but please keep in mind, other things can also cause the issue. The flow chart above explains what to check. I can't say to replace the BCM and find it was only a waste of your money. Something in that system has failed. It could be related to the BCM. The only way to be sure is to run diagnostics.

If you find a trouble code, for example, B1000, that indicates an internal fault in the body control module. This code would indicate the control module has failed internally and needs replaced.

I hope this makes sense.

Joe