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Don 'Mo Lurch'
Don 'Mo Lurch', Auto Mech / Electronics
Category: Chevy
Satisfied Customers: 20958
Experience:  Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.
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1999 Chevrolet: light stays..spark..pass lock system..tester

Resolved Question:

1999 Chevrolet 1500 pickup
security light stays on vehicle will start and but shut off immediately. spark and fuel are ok .suspect pass lock system but do not have a tester
Submitted: 7 years ago.
Category: Chevy
Expert:  Don 'Mo Lurch' replied 7 years ago.

 

This sounds like the PassLock System & could be a bad Ignition Cylinder or wires at the Cylinder

 

TRY:

 

Be sure the battery is fully charged.
Turn the ignition switch from the OFF position to the CRANK position allowing the vehicle to try and start.
The vehicle will start and then stall.
Leave the ignition switch in the ON position while observing the security indicator.
When the security indicator turns off, which can take up to 10 minutes, turn the ignition switch off.
Wait 10 seconds .
Repeat above Steps two more times (3 times total).
The BCM and the PCM/VCM will learn the new code on the next start attempt.

Don 'Mo Lurch' and other Chevy Specialists are ready to help you
Customer: replied 7 years ago.

ok it this fails what is the next step

replace lock cylinder, ignition switch , module are there any tests?

Expert:  Don 'Mo Lurch' replied 7 years ago.

 

Use of Dealer Scan Tool is needed to verify PassLock issue & component failure
TYpically it is the Ignition Switch, as the Hall Effect Resistor is internal, but wires from Switch to BCM & BCM need to be tested also, via Dealer Scan Tool

Expert:  Don 'Mo Lurch' replied 7 years ago.

Use of Dealer Scan Tool is needed to verify PassLock issue & component failure
TYpically it is the Ignition Switch, as the Hall Effect Resistor is internal, but wires from Switch to BCM & BCM need to be tested also, via Dealer Scan Tool

If you need further, please ask
If not, please click ACCEPT

Customer: replied 7 years ago.

HI

We have replaced the Ignition lock cylinder, ignition switch, and the passlock module. We have done the manual relearn process a dozen times. The security light is always on when the ignition is on. The vehicle still starts then shuts right down.

Expert:  Don 'Mo Lurch' replied 7 years ago.

 

Use of Dealer Scan Tool is needed to verify PassLock issue & component failure

 

There are a number of components associated with the PassLock System
"IF" you believe it is the PassLock System & have verified Fuel Pressure & Spark, then you need to have the PassLock System tested via Scan Tool, as it will be more expensive to keep replacing Parts

Customer: replied 7 years ago.
This is part of a question I already paid for
Expert:  Don 'Mo Lurch' replied 7 years ago.

 

 

sorry.....................

 

You jsut asked:

 

HI

We have replaced the Ignition lock cylinder, ignition switch, and the passlock module. We have done the manual relearn process a dozen times. The security light is always on when the ignition is on. The vehicle still starts then shuts right down.

 

 

My answer was:

 

Use of Dealer Scan Tool is needed to verify PassLock issue & component failure

 

There are a number of components associated with the PassLock System
"IF" you believe it is the PassLock System & have verified Fuel Pressure & Spark, then you need to have the PassLock System tested via Scan Tool, as it will be more expensive to keep replacing Parts

Customer: replied 7 years ago.
I paid yesterday this question was part of the original problem
Expert:  Don 'Mo Lurch' replied 7 years ago.

 

Thanks...........I thought that was what you meant

Sorry for the misunderstanding