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.
1998 Cadillac Seville STSFACTORY OEM SERVICE PROCEDURE
BCM DTC Definition
WARNING: This page is about a different car, the 1997 Cadillac Seville, 1997 Cadillac Eldorado, and 1997 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
BCM COMMUNICATION PROBLEMS
| Affected System | Perform Test |
|---|---|
| Class 2 Serial Data Line | Class 2 Serial Data Line System Check |
| Scan Tool Communications | Chart A, Scan Tool Will Not Communicate |
BCM DTC DEFINITION
| Code No. | Circuit Affected |
|---|---|
| U1016 | Loss Of Serial Communications - PCM |
| U1088 | Loss Of Serial Communications - SIR |
| U1096 | Loss Of Serial Communications - IPC |
| U1153 | Loss Of Serial Communications - CCP |
| U1169 | Loss Of Serial Communications - MMM |
| U1255 | Class 2 Initialization Error |
| U1300 | Class 2 Short To Ground |
| U1301 | Class 2 Short To Voltage |
| B0532 | Fuel Level Sender Short To Ground |
| B0533 | Fuel Level Sender Short To Voltage |
| B1552 | Loss Of PZM Keep Alive Memory (KAM) |
| B1556 | PZM EEPROM Write Error |
| B1558 | PZM EEPROM Checksum Error |
| B1970 | Exterior Light Power Fault |
| B1971 | Inadvertent Power Fault |
| B1972 | Low Power Control Fault |
| B1973 | High Power Control Fault |
| B1981 | Battery Voltage Too Low |
| B1982 | Battery Voltage Too High |
| B1983 | Source Voltage Too Low |
| B2470 | Daytime Running Lights Fault |
| B2471 | Interior Lights Fault |
| B2472 | Low Beam Output Fault |
| B2473 | High Beam Output Fault |
| B2476 | Parking Lights Output Fault |
| B2477 | Reverse Relay Shorted To Ground |
| B2478 | Reverse Relay Shorted To Voltage |
| B2502 | Park Relay (BTSI) Shorted To Ground |
| B2503 | Park Relay (BTSI) Shorted To Voltage |
| B2550 | Storage Mode Entered |
| B2719 | UTD - Trunk Tamper Switch Fault |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.