GM Service Manual Online
For 1990-2009 cars only

Theft Deterrent System - (Domestic, Passlock)

Auto Learn Timer : The scan tool displays the seconds used by the BCM to learn valid code from the Passlock™ sensor. The learn procedure consists of 3 consecutive periods.

Battery Voltage : The scan tool displays the battery system voltage.

Content Theft State : The scan tool displays Off/Idle/Armed/RFA Arm Delay/Alarm. The scan tool will display the current state of the content theft deterrent (CTD) system.

Content Theft Lamp : The scan tool displays Off/On/Flashing. The scan tool will display the current security indicator lamp state.

Door Ajar Switch : The scan tool displays Off when the applicable door is fully closed or On when the door is open or ajar.

Left Rear Door Ajar Switch : The scan tool displays Off when the left rear door is fully closed or On when the left rear door is open or ajar.

Liftgate Ajar Switch : The scan tool displays Closed when the liftgate is fully closed or Ajar when the liftgate is open or ajar.

Liftglass Ajar Switch : The scan tool displays Closed when the liftglass is fully closed or Ajar when the liftglass is open or ajar.

Passlock™ Code : The scan tool displays the validity of the Passlock™ code received by the BCM. The scan tool displays OPEN, SHORTED, TAMPER and a valid code as a numeric value (1-10).

Passlock™ Data Voltage : The scan tool displays the voltage code from the Passlock sensor to the Body Control module (BCM). A valid Passlock sensor voltage of 5 volts will be displayed on the scan tool when the ignition cylinder is turned to the on position. Once the ignition cylinder has been rotated to the crank position the Passlock voltage will drop from 5 to 0.86-4.28 volts depending on which of the 10 possible Passlock sensors the vehicle is equipped with. The (BCM) then determines if the voltage received is a valid or invalid code. The scan tool will continue to display the Passlock voltage code (0.86-4.28 volts) received by the (BCM) when the ignition cylinder returns to the on/run position.

Passlock™ Ignition Cycles : The scan tool displays the number of times the ignition has been cycled from Off to the Start position.

Passlock™ Power : The scan tool displays the state of the power to the passlock sensor by On or Off.

Passlock™ State : The scan tool displays the state of the Passlock™ system.

Right Rear Door Ajar Switch : The scan tool displays Off when the right rear door is fully closed or On when the right rear door is open or ajar.

Seed and Key Timer : The scan tool displays 0-2550 seconds, The scan tool displays the current state of the Seed and Key Timer, which must time out in order for the relearn procedure to be complete.

Tamper Timer : The scan tool displays the time remaining when in the tamper mode. The timer starts when the ignition switch is turned to the RUN position and the BCM receives a Passlock™ data voltage different from the last learned voltage. The timer has a delay of 10 minutes and will stay active even if the ignition switch is cycled from the RUN to the OFF position.

VCM/PCM in Fail Enable : The scan tool displays the state of the VCM/PCM fail enable mode. The scan tool displays YES when the Passlock™ system transitions from the Monitor Passlock™ Data state to the VCM/PCM Fail Enable state.

VTD Auto. Learn Timer : The scan tool displays Active/Inactive. The scan tool displays the current state of the Auto. Learn Timer, which must time out three times in order for the relearn procedure to be complete.

VTD Fuel Disable : The scan tool displays the state of the VTD fuel disable mode. The scan tool displays INACTIVE when the Passlock™ system verifies a valid password.

VTD Fuel Disable Until Ignition Off : The scan tool displays the state of the VTD fuel disable until Ignition off mode. The scan tool displays NO when the Passlock™ system verifies a valid password.

VTD Password : The scan tool displays OK/Incorrect. The scan tool displays OK when the PCM has received a learned fuel continue password from the VTD system. The scan tool displays Incorrect when the PCM has received a unlearned fuel continue password from the VTD system.

Immobilizer (Export, RPO AU8)

8 - Digit GM Part Number : The scan tool displays the 8 - Digit GM Part Number. The scan tool displays the part number of the control module .

Auto. Learn Counter : The scan tool displays 0-3. The scan tool displays the current state of the Auto. Learn Timer Counter. The Auto. Learn Counter must increment a total of 3 times in order for the relearn procedure to be complete.

Auto. Learn Timer Status : The scan tool displays: 00 Sec. - 10:00 Min. The scan tool displays the current state of the Auto. Learn Timer which increments in 10-second intervals. The Auto. Learn Timer must time out 3 times in order for the relearn procedure to be complete.

Battery Voltage : The scan tool displays 0-30 volts. The scan tool displays the current Battery Voltage input.

Calibration ID : The scan tool displays the Calibration ID. Display indicates the calibration ID of the VTD systems module.

Dash Mode : The scan tool displays On/Off. The scan tool displays On when the vehicle is equipped with a dash mounted ignition switch.

Export Mode : The scan tool displays On/Off. The scan tool displays On when the VTD system is configured as export. The scan tool displays Off when the VTD system is configured as domestic.

First Key Flag : The scan tool displays On/Off. The scan tool displays On when the theft deterrent control module is ready to learn the first key transponder value.

Fuel Continue : The scan tool displays On/Off. The scan tool displays On when the VTD system has read a valid key and is sending its fuel continue password via the serial data circuit.

Fuel Disable Ignition Off : The scan tool displays On/Off. The scan tool displays On when the PCM has received the fuel disable password from the VTD system. This indicates the PCM will not allow fuel delivery until the ignition is switched off prior to another start attempt.

Ignition Counter : The scan tool displays 0-255. The module counts each time the ignition is cycled from ON to OFF.

Ignition Voltage : The scan tool displays 0-18. The scan tool displays the current ignition voltage.

Julian Date of Build : The scan tool displays the Julian Date of Build. Display indicates the date the module was built.

Manufactures Enable Counter : The scan tool displays 0-255. The Manufactures Enable Counter is cleared prior to leaving the assembly plant. This data value is for use at the assembly plant only.

Master Keys Learned : The scan tool displays 0-10. The scan tool displays the number of learned master keys.

No. of Key Codes Learned : The scan tool displays 1-10. The scan tool displays the number of transponder values learned by the theft deterrent control module.

PROM ID : The scan tool displays the PROM ID. The scan tool displays the 4- digit internal PROM ID of the module.

Report Password : The scan tool displays On/Off. The scan tool displays On when the VTD system has sent its fuel continue password to the PCM via the serial data circuit.

System Power Mode : The scan tool displays Unknown/Off Battery Save/Off Asleep/Off Awake/Unlock/Rap Unlock/Accessory/Run/Crank/Rap. The scan tool displays the current state of the VTD system power mode.

Tamper Flag : The scan tool displays On/Off. The scan tool displays On when the VTD system has read a key transponder value that has not been previously learned.

Two Good Keys Flag : The scan tool displays On/Off. The scan tool displays On when the VTD system is ready to learn the 2 key transponder values.

Valet Flag : The scan tool displays On/Off. The scan tool displays On when the VTD system has read the key transponder being used is coded as a valet key.

VTD Fail Enable : The scan tool displays On/Off. The scan tool displays On when the VTD system has been configured with VTD fail enable.

VTD States : The scan tool displays Ignition Off/Normal Decision/Learn First key/Tamper/Monitor Key/Fail Enable/Learn More Keys/Seedkey Lrn Pend/Seedkey Learn/Auto Learn Pend/Auto Learn/Wakeup/No Coded Key/Check Second Key/Auto Lrn Done/Vin Check/Vin Timer. The scan tool displays the current state of the VTD system.

Year Module Built : The scan tool displays the year the module was built.