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Old 11-28-2020, 01:42 PM   #1
jupitersaturn
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2000 L-Series 2.2L Sedan
Default 2000 LS 2.2L Instrument cluster

I recently had to "re-teach" the car it's codes by using the "ignition on/off for (3) 15 minute intervals" method, and it's been cranking good since. Been about a week, but why is my "service" AND "security" indicator lights staying on all the time? As always, any and all input and expertise will be greatly appreciated.
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Old 11-28-2020, 05:05 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: 2000 LS 2.2L Instrument cluster

You may have one or two problems with the check engine and security indicators on. A reader should be able to decode the cel but may not decode Passlock security errors. Most cel codes are emissions related (P codes). GMs Passlock security is separate from emissions errors so there may two or more error codes. I don't know if generic readers can decode security errors.

Here's a link with some Passlock error codes;https://ricksfreeautorepairadvice.co...trouble-codes/.

B codes cannot be read by generic readers. GMs Tech II scantool, high end scantools and aftermarket scantools can display B, C, U codes in addition to P codes.

Passlock security remaining on means security failed self tests with the indicator remaining on to alert you of failure. Passlock security no longer providing anti theft protection. Whether thieves know how security systems work in every vehicle model is unknown. Your choice to leave it this way without theft protection or try determining where fault lies then consider if repairs are possible. Security has Passlock sensors detecting ignition lock rotation, sending signals to the bcm. The bcm determines if signals are valid or not. It sends either a go or no go signal to the ecm. A go signal allows the ecm to operate injectors for normal engine running. A no-go signal disables injector operation. The ecm prevents the engine from running. The bcm turns on security in theft mode by flashing the security light. With the security light always on, something failed. My best guess is the Passlock sensor assembly on the steering column. A three wire unit. Without more information, this problem can't be narrowed down.
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