Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSATURN2002SL1 L4-1.9L SOHC VIN 8REPAIR AND DIAGNOSISBODY AND FRAMEBODY CONTROL SYSTEMSBODY CONTROL MODULEDESCRIPTION AND OPERATIONBCM
2002 Saturn SL1 L4-1.9L SOHC VIN 8
BCM
2002 Saturn SL1 L4-1.9L SOHC VIN 8SECTION BCM
CIRCUIT CHART
Circuit assignments for the Body Control Module (BCM) relating to device power:
DEVICE POWER
Battery voltage is supplied to the BCM by circuit 1640. This input is internally monitored by the BCM for proper operating voltage. The proper operating voltage range is from 9 to 16 volts.
GROUNDING
Ground for the BCM is by circuit 550 through the left instrument panel fuse block and left body ground splice pack/body ground.
POWER MODE
The BCM monitors ignition 1 voltage circuit 39, accessory voltage circuit 43 and the Engine Run Flag (ERF). The ERF is a serial data message from the engine controller. The BCM determines the state of the ignition switch for all modules on the serial data link.
ECU MALFUNCTION
The BCM performs an Electrically Erasable Programmable Read-only Memory (EEPROM) checksum as a part of its internal diagnostics as the BCM is operating. When the EEPROM checksum does not equal a predetermined value, DTC B1000 - ECU Malfunction sets. The checksum is the contents of each memory location in EEPROM added together.
OPTION CONFIGURATION
The vehicle option content information must be entered as part of the BCM programming procedure. If the vehicle option content information is not included and programming procedure is completed, DTC B1001 - Option Configuration Error will set.
Circuit Chart:
Circuit assignments for the Body Control Module (BCM) relating to device power:
DEVICE POWER
Battery voltage is supplied to the BCM by circuit 1640. This input is internally monitored by the BCM for proper operating voltage. The proper operating voltage range is from 9 to 16 volts.
GROUNDING
Ground for the BCM is by circuit 550 through the left instrument panel fuse block and left body ground splice pack/body ground.
POWER MODE
The BCM monitors ignition 1 voltage circuit 39, accessory voltage circuit 43 and the Engine Run Flag (ERF). The ERF is a serial data message from the engine controller. The BCM determines the state of the ignition switch for all modules on the serial data link.
ECU MALFUNCTION
The BCM performs an Electrically Erasable Programmable Read-only Memory (EEPROM) checksum as a part of its internal diagnostics as the BCM is operating. When the EEPROM checksum does not equal a predetermined value, DTC B1000 - ECU Malfunction sets. The checksum is the contents of each memory location in EEPROM added together.
OPTION CONFIGURATION
The vehicle option content information must be entered as part of the BCM programming procedure. If the vehicle option content information is not included and programming procedure is completed, DTC B1001 - Option Configuration Error will set.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.