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 MANUALSBUICK2000CENTURY CUSTOMREPAIR AND DIAGNOSISBODY & FRAMEBODY, CAB CONTROL SYSTEMSBODY CONTROL MODULESSELF-DIAGNOSTIC SYSTEMBODY CONTROL MODULE (BCM) DIAGNOSTIC SYSTEM CHECK

2000 Buick Century Custom

Body Control Module (BCM) Diagnostic System Check

2000 Buick Century CustomSECTION Body Control Module (BCM) Diagnostic System Check

Ensure battery condition, cold cranking amperage and reserve capacity meet specifications. Replace as necessary. Install scan tool to Data Link Connector (DLC). If scan tool powers up, go to next step. If scan tool does not power up, go to SCAN TOOL DOES NOT POWER UP .
Turn ignition on, engine off. Try to establish scan tool communication with BCM. If communication with BCM is established, go to next step. If communication with BCM is not established, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE .
Select display DTC function for BCM. Record all displayed DTCs and status of displayed DTCs. If DTCs are displayed, go to next step. If no DTCs are displayed, attempt to diagnose malfunctioning system or device by symptom. Go to appropriate article for malfunctioning system or device.
If scan tool displays any DTCs that begin with "U", go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE . If scan tool does not display any DTCs that begin with "U", go to next step.
If scan tool displays DTC B1000, B1013 or B1015, go to BODY CONTROL MODULE (BCM) DTC DEFINITIONS . If scan tool does not display DTC B1000, B1013 or B1015, go to next step.
If scan tool displays DTC B1334, B1339, B1354 or B1422, go to BODY CONTROL MODULE (BCM) DTC DEFINITIONS . If scan tool does not display DTC B1334, B1339, B1354 or B1422, go to system in which customer concern is addressed.

BODY CONTROL MODULE (BCM) DTC DEFINITIONS

DTC ⁽¹⁾

Module

Description

B0016 ⁽²⁾

SDM

Right Front Passenger Frontal Deployment Loop Resistance Low

B0017 ⁽²⁾

SDM

Right Front Passenger Frontal Deployment Loop Open

B0018 ⁽²⁾

SDM

Right Front Passenger Frontal Deployment Loop Short To Ground Or Voltage Out Of Range

B0022 ⁽²⁾

SDM

Left Front Passenger Frontal Deployment Loop Resistance Low

B0024 ⁽²⁾

SDM

Left Front Passenger Frontal Deployment Loop Short To Ground Or Voltage Out Of Range

B0026 ⁽²⁾

SDM

Left Front Passenger Frontal Deployment Loop Open

B0040 ⁽²⁾

SDM

Left Front Driver Side Deployment Loop Resistance Low

B0041 ⁽²⁾

SDM

Left Front Driver Side Deployment Loop Open

B0045 ⁽²⁾

SDM

Left Front Side Deployment Loop Short To Ground Or Voltage Out Of Range

B0051 ⁽²⁾

SDM

Deployment Commanded

B0053 ⁽²⁾

SDM

Deployment Commanded With Loop Malfunctions Present

B0077 ⁽²⁾

SDM

Left Front/Driver SIS Malfunction

B0079 ⁽²⁾

SDM

Incorrect Left Front/Driver SIS Installed

B0080 ⁽²⁾

SDM

Discard Left Front/Driver SIS

B0332 ⁽³⁾

HVAC

Outside Air Temperature Sensor Short To Ground

B0333 ⁽³⁾

HVAC

Outside Air Temperature Sensor Open

B0337 ⁽³⁾

HVAC

Inside Air Temperature Sensor Short To GND

B0338 ⁽³⁾

HVAC

Inside Air Temperature Sensor Open

B0348 ⁽³⁾

HVAC

Sunload Temperature Sensor Open

B0361 ⁽³⁾

HVAC

Left Actuator Feedback Short To GND

B0363 ⁽³⁾

HVAC

Left Actuator Feedback Open

B0365 ⁽³⁾

HVAC

Right Actuator Feedback Short To GND

B0367 ⁽³⁾

HVAC

Right Actuator Feedback Open

B0441 ⁽³⁾

HVAC

Left Actuator Out Of Range

B0446 ⁽³⁾

HVAC

Right Actuator Out of Range

B0570 ⁽⁴⁾

IPC

Season Odometer Malfunction

B0600 ⁽⁴⁾

IPC

Option Content Failure

B0602 ⁽⁴⁾

IPC

PLL Oscillator Error

B0608 ⁽⁴⁾

IPC

Power Moding Error

B1000

BCM, IPC

ECU Malfunction In Body Control Systems

B1001 ⁽²⁾

SDM

Option Configuration Error

B1013

BCM

Calibration ROM Checksum Error

B1015

BCM

VIN Information Error

B1334

BCM

Device Power #2 (Low Current #2) Circuit Open

B1339

BCM

Device Power #3 Circuit Open

B1354

BCM

Device Ground #2 (Chassis Ground #2) Circuit Open

B1422

BCM

Device Power Moding Malfunction

B1477

BCM

Retained Accessory Power Circuit Low

B1478

BCM

Retained Accessory Power Circuit High

B1482

BCM

Inadvertent Power Short To Ground

B2533

BCM

Front Fog Lamps Control Circuit High

B2552 (REGAL ONLY)

BCM

Backup Lamps Control Circuit Low

B2553 (REGAL ONLY)

BCM

Backup Lamps Control Circuit High

B2559

BCM

Courtesy Lamps Ground Open

B2577

BCM

Headlamp Control Circuit Low

B2578

BCM

Headlamp Control Circuit High

B2587

BCM

Park Lamp Control Circuit Low

B2588

BCM

Park Lamp Control Circuit High

B2603

BCM

DRL Control #1 Circuit High

B2608

BCM

DRL Control #2 Circuit High

B2617

BCM

Passenger Compartment Dimming #2 Circuit Low

B2618

BCM

Passenger Compartment Dimming #2 Circuit High

B2647

BCM

Ambient Light Sensor Circuit Low

B2648

BCM

Ambient Light Sensor Circuit High

B2747

BCM

Traction Control Switch Circuit Low

B2752 ⁽⁵⁾

BCM

Horn Relay Coil Circuit Low

B2753 ⁽⁵⁾

BCM

Horn Relay Coil Circuit High

B2818

BCM

Low Tire Pressure System Reset Circuit Low

B2957 ⁽⁶⁾

BCM

Security System Sensor Data Circuit Low

B2958 ⁽⁶⁾

BCM

Security System Sensor Data Circuit High

B2960 ⁽⁶⁾

BCM

Security System Sensor Data Incorrect But Valid

B3031 ⁽⁶⁾

BCM

Security System Controller In Learn Mode

B3094 ⁽⁶⁾

BCM

No Response From ECM/PCM Received

B3100 ⁽⁷⁾

BCM

Keyless Entry Data Link Circuit Malfunction

B3102 ⁽⁷⁾

BCM

Keyless Entry Data Link Circuit Low

B3103 ⁽⁷⁾

BCM

Keyless Entry Data Link Circuit High

B3106 ⁽⁷⁾

BCM

Keyless Entry Data Link Parity Error

B3267

BCM

Decklid Relay Output Short To Ground/Open

B3268

BCM

Decklid Relay Output Short To Battery

U1000

BCM, EBCM, IPC, SDM

Class 2 Communication Malfunction

U1001-U1254

BCM, EBCM, IPC, SDM

Loss Of XXX Communications

U1255

BCM, EBCM, IPC, SDM

Class 2 Communication Malfunction

U1300

BCM, EBCM, SDM

Class 2 Circuit (Short To Ground)

U1301

BCM, EBCM, SDM

Class 2 Circuit (Short To Voltage)

⁽¹⁾	For DTCs beginning with "C", perform diagnostic system check in appropriate BRAKES article. For DTCs beginning with "P", perform OBD diagnostic system check in appropriate ENGINE PERFORMANCE article. For DTCs not listed, refer to system in which customer concern is apparent.

⁽²⁾	See lemon-25(R) AIR BAG SERVICE & REPAIR MANUAL, DOMESTIC & IMPORTED MODELS.

⁽³⁾	See appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.

⁽⁴⁾	See appropriate INSTRUMENT PANELS article.

⁽⁵⁾	See appropriate STEERING COLUMN SWITCHES article.

⁽⁶⁾	See appropriate ANTI-THEFT SYSTEMS article.

⁽⁷⁾	See appropriate REMOTE KEYLESS ENTRY article.

RENDER: 1.0x

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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.