2000 Pontiac Bonneville SLE. Car developed a parasitic battery drain.A new message "Service theft system" appeared on the instrument monitor. After eliminating the alternator and battery I used an ammeter test on the fuse/relay compartment under the seat. After monitoring the voltage and amperage, waiting for electronice to shut down, the amperage draw continued for over an hour at 4.49 amps as the voltage dropped. After pulling all the relays, number 40 which says "parking lights" dropped the amperage draw to 1.89 amps. A fuse # 27 "audio" dropped it another 1.38 amps down to ..05 which is upper range acceptable. I charged the battery back up and removed the static charge and was reading 12.60 volts. The next morning with the relay and fuse removed, the battery voltage was 12.48 and the car started fine.I am thinking that whatever causes the power to shut down about 15min after the ignition is shut off is not working properly. What triggered the message about "service Theft system" in the beginning?

I would be looking at the BCM. You may have something not allowing it to sleep.

Where is it located on my 2000 Bonneville SLE ?

BODY CONTROL MODULE COMPONENTS (BODY CONTROL SYSTEM) Document ID# 486238

Body Control Module Components

Under the rear seat on the right side

Location

Locator View

Connector End View

Battery

Under the rear seat on the right side

Power and Grounding Component Views in Engine

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Dash Integration Module (DIM)

Behind instrument panel, above the right dash sound insulator

Body Control System Component Views

Body Control System Connector End Views

Ignition Switch

Mounted on the dash panel right of the steering column

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Instrument Panel Module (IPM)

Behind the instrument panel, above the left dash sound insulator

Body Control System Component Views

Body Control System Connector End Views

Rear Fuse Block

Center of the passenger compartment under the rear seat cushion

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

Rear Integration Module (RIM)

Behind the rear seat back cushion (upper, left)

Body Control System Component Views

Body Control System Connector End Views

Under Hood Fuse Block

Front right side of the engine compartment

Power and Grounding Component Views in Wiring Systems

Power and Grounding Connector End Views in Wiring Systems

C200

Left lower front corner of the passenger compartment on the underside of the instrument panel (body harness to instrument panel round harness)

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C201

Right lower front corner of the passenger compartment on the underside of the instrument panel (body harness to instrument panel round harness)

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

C305

Under the rear seat on the right side

Harness Routing Views in Wiring Systems

Inline Harness Connector End Views in Wiring Systems

G200

Left front lower corner of the passenger compartment on the left front door pillar

Power and Grounding Component Views in Wiring Systems

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G201

Lower right corner of the passenger compartment on the right front door pillar

Power and Grounding Component Views in Wiring Systems

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G305

Under the rear seat on the right side

Power and Grounding Component Views in Wiring Systems

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G402

On the lower left corner of the trunk forward of the tail lamp

Power and Grounding Component Views in Wiring Systems

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P102

Right lower front corner of the passenger compartment on the bulk head

Harness Routing Views in Wiring Systems

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S205

In the instrument panel harness 6.5 cm (2.5 in) from the C216 breakout

Power and Grounding Component Views in Wiring Systems

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S208

Instrument panel harness, approx. 6.5 cm (2.5 in) from the center console harness breakout, towards the instrument panel module

Harness Routing Views in Wiring Systems

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S212

In the body harness 56 cm (22 in) rear of the DIM breakout

Harness Routing Views in Wiring Systems

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Well, the problem finally showed itself after a lengthy cat and mouse game. I dislike electrical problems to begin with but even worse when they dissappear when looking for them. The amperage test meter finally showed the drain and was able to find two fuses in the (under the rear seat) panel. Owners manual showed they controlled the parling lanos and the other "audio" Aftre pulling these two fuses and letting the car sit for two days and no battery voltage drop. then the third day I went to start the car with the fuses still out and barely turned over. I took Carfixer 007 advise and ordered a ner GM BCM. After waiting 8 days I calleed Summit Racing and they then tols me it wouldn't be available until afetr Valentines day. I was able to get one (GM) at Auto Zone for $260.00 ouch! The BCM is located on the passenger side panel near the glove box. All is well and running great again ! Thanks Carfixer007 !!

Thanks for letting us know how it turned out!