K Yukon/Denali 4WD V8-5.7L VIN R (2000)
terminal contact causing an open or intermittently open circuit. Using an equivalent male terminal from the J 38125-B, test that the retention
force is significantly different between an good terminal and a suspect terminal. Replace the female terminal in question.
DISCLAIMER
Correction
Have any of the following components had service recently?
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The BCM
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The ignition lock cylinder case assembly
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The PCM/VCM
If any of the above components have been replaced, the Programming Theft Deterrent System Components procedure must be performed before any
diagnostic procedures are performed.
To assist in diagnosis, the following steps are provided.
1.
Does the engine start? If not, use the Engine Cranks but Does Not Run diagnostic information in the Engine Controls sub-section of the applicable
Service Manual.
Important:
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The Security telltale on the message center is controlled by the vehicle theft deterrent (VTD) system and the content theft deterrent (CTD)
system. The Security telltale is controlled by the BCM through the Class 2 data line.
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The VTD system portion of the BCM controls the Security telltale when the ignition switch is in the On position. The VTD system uses the
Security telltale as a malfunction indicator.
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The CTD system portion of the BCM controls the Security telltale when the ignition switch is in the Off position. The CTD system uses the
Security telltale to identify system status.
2.
Observe the Security indicator lamp in the instrument panel.
3.
Remove the key from the lock cylinder.
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Security indicator should be Flashing when the door is open.
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Security indicator should be Off when all the doors are closed.
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If the Security indicator does not come On or go Off correctly, refer to the Content Theft Deterrent System diagnostic and repair information in
the applicable Service Manual.
4.
With the Doors closed, place the key in the lock cylinder and turn to the Run position. Observe the Security indicator lamp.
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Lamp is On and does not go Off however, the engine starts. This indicates that the VTD system detected a fault when the engine was running.
^
Lamp flashes On and Off. This indicates a problem has been detected by the VTD (Passlock(TM)) system and the engine may not start this key
cycle, a current condition.
