K 1500 Truck 4WD V8-6.5L DSL Turbo VIN S (1999)
Alarm Module: Service and Repair
PASSLOCK Reprogramming Auto Learn
PASSLOCK REPROGRAMMING AUTO LEARN
IMPORTANT: If a new vehicle/powertrain control module (VCM/PCM) is being installed for the first the manufacturing enable bit will be set and
the auto learn procedure may not be necessary.
The following procedure allows for anyone to reprogram the EVO/PASSLOCK module learned data code with any tools, other than the scan tool,
when any of the following parts are replaced:
*
The EVO/PASSLOCK module
*
The PASSLOCK sensor
*
The VCM/PCM
*
The EVO/PASSLOCK module will set the DTC B3031 module in the learn mode when entering the reprogramming procedure.
IMPORTANT: Erase the PASSLOCK related diagnostic trouble codes (DTCs) that are stored in the VCM/PCM. If there are any powertrain related
DTCs, record these DTCs then:
The following is the Auto Learn Procedure:
1. Insure the ignition key is in the "ON" position.
2. Clear all EVO/PASSLOCK module and VCM/PCM DTCs. Record and refer any VCM/PCM DTCs to:
3. Momentarily rotate the ignition key to the "CRANK" position (Do NOT start the vehicle), then release it to the "RUN" position (Do NOT key
"OFF" in the process).
4. Wait 10 minutes. Observe the "SECURITY" indicator. Refer to the following list for the appropriate responses:
A. If the PASSLOCK sensor was replaced the "SECURITY" indicator will flash for the 10 minutes duration.
B. If the EVO/PASSLOCK module was replaced, the ""SECURITY"" indicator will flash for a few seconds and then remain "ON" for the
remainder of the 10 minutes duration.
C. If the VCM/PCM was replaced with a new programmed VCM/PCM and connected to the vehicle for the first time, the vehicle will start and
this procedure may not be necessary.
D. If the replacement VCM/PCM was connected to any vehicle at any other time, even momentarily, the "SECURITY" indicator will flash for a
few seconds and then remain "ON" for the 10 minutes duration.
5. The "SECURITY" indicator will transition from flashing to "ON" briefly to "OFF" after 10 minutes if remaining in the ignition "ON" position.
6. Turn the ignition switch to the "OFF" position and wait for 10 seconds.
7. Repeat steps 3-6 two more times. The new security code is ready to be communicated among the PASSLOCK sensor, EVO/PASSLOCK module
and VCM/PCM. The new password is learned on the next ignition lock cylinder cycle from "OFF" to "CRANK" to "ON" (start attempt).
