B0103
Immobilizer Antenna Ring Circuit
1992-1996 BMW 318is E36 1.8L I4
Moderate SeverityBodyGeneric (SAE)
Description
Malfunction in the immobilizer antenna ring (transponder receiver coil) around the ignition lock cylinder or start button.
Symptoms
- Intermittent no-start
- Security light on
- Key sometimes not recognized
- Works with key held in specific position
Common Causes
- Faulty antenna ring coil
- Wiring damage from steering column work
- Connector loose
- Coil winding open or shorted
Diagnostic Steps
- Measure antenna ring resistance
- Inspect connector at steering column
- Check wiring from antenna to immobilizer module
- Test with oscilloscope for signal
Repair Notes
Replace immobilizer antenna ring. Ensure connector is fully seated after steering column work.
Related Codes
Other Body Codes
- B0001Driver Frontal Stage 1 Deployment Control
- B0002Driver Frontal Stage 2 Deployment Control
- B0003Passenger Frontal Stage 1 Deployment Control
- B0004Passenger Frontal Stage 2 Deployment Control
- B0005Driver Knee Airbag Deployment Circuit
- B0006Passenger Knee Airbag Deployment Circuit
- B0010Driver Side Airbag Deployment
- B0011Driver Side Airbag Deployment Circuit Open
- B0012Driver Side Airbag Deployment Circuit Short to Ground
- B0013Driver Side Airbag Deployment Circuit Short to Battery
B0103 on Other Vehicles
Common Questions
What does code B0103 mean on a 1992-1996 BMW 318is E36?
B0103 stands for "Immobilizer Antenna Ring Circuit". Malfunction in the immobilizer antenna ring (transponder receiver coil) around the ignition lock cylinder or start button.
What are the symptoms of B0103 on a BMW 318is E36?
Common symptoms of B0103 include: Intermittent no-start, Security light on, Key sometimes not recognized, Works with key held in specific position.
What causes B0103 on a 1992-1996 BMW 318is E36?
Common causes of B0103 include: Faulty antenna ring coil, Wiring damage from steering column work, Connector loose, Coil winding open or shorted.