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 MANUALSBUICK1998REGAL 25TH ANNIVERSARY EDITIONREPAIR AND DIAGNOSISBODY & FRAMEBODY, CAB CONTROL SYSTEMSBODY CONTROL MODULESELF-DIAGNOSTIC SYSTEMBCM DTC DEFINITIONS
1998 Buick Regal 25th Anniversary Edition
BCM DTC Definitions
1998 Buick Regal 25th Anniversary EditionSECTION BCM DTC Definitions
BCM DTC DEFINITIONS
| Code No. (1) | Circuit Affected | ||
|---|---|---|---|
| B0603 | BCM Internal Memory Malfunction Write Error) | ||
| B0605 | BCM Internal Memory Malfunction Checksum Error) | ||
| B0608 | BCM Power Moding Error | ||
| B0702 | RAP Relay Circuit (Short To Ground Or Open) | ||
| B0703 | RAP Relay Circuit (Short To Voltage) | ||
| B0807 | Battery For Door Lock Circuit (Open) | ||
| B0812 | Courtesy Lights Battery Feed Circuit (Open) | ||
| B0823 | Door Lock Actuator Ground Feed Circuit (Open) | ||
| B0828 | Theater Dimming Ground Circuit (Open) | ||
| B1802 | Courtesy Lights Circuit (Short To Ground) | ||
| B2202 | Driver's Door Unlock Circuit Short To Ground Or Open) | ||
| B2203 | Driver's Door Unlock Circuit Short To Voltage) | ||
| B2403 | Foglight Switch Circuit (Short To Voltage) | ||
| B2417 | DRL Control Module Circuit Short To Ground Or Open) | ||
| B2418 | DRL Control Module Circuit Short To Voltage) | ||
| B2452 | Theater Dimming No. 1 Circuit Short To Ground Or Open) | ||
| B2453 | Theater Dimming No. 1 Circuit Short To Voltage) | ||
| B2457 | Theater Dimming No. 2 Circuit Short To Ground Or Open) | ||
| B2458 | Theater Dimming No. 2 Circuit Short To Voltage) | ||
| B2528 | Horn Relay Circuit (Short To Voltage) | ||
| B2721 | PASS-Key(R) II Detection Circuit Out Of Range) | ||
| B2722 | PASS-Key(R) II Detection Circuit Short To Ground) | ||
| B2723 | PASS-Key(R) II Detection Circuit (Short To Voltage Or Open) | ||
| B2735 | PASS-Key(R) II Programming Mode Active | ||
| B2739 | Key-In-Ignition Fault | ||
| B2802 | RFA Link Circuit (Short To Ground) | ||
| B2803 | RFA Link Circuit (Short To Voltage) | ||
| B2805 | RFA Programming/Diagnostic Mode Message Not Received | ||
| B2806 | RFA Link Parity Error | ||
| U1016 | PCM Class 2 Source ID 10 | ||
| U1040 | EBTCM Class 2 Source ID 28 | ||
| U1064 | Loss Of BCM Source ID 40 | ||
| U1096 | Instrument Panel Class 2 Source ID 60 | ||
| U1255 | Loss Of Class 2 Serial Data Fault (General) | ||
| U1300 | Class 2 Circuit (Short To Ground) | ||
| U1301 | Class 2 Circuit (Short To Voltage) | ||
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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.