Theft Deterrent Indicator Lamp Circuit
2003-2003 Toyota Matrix 1.8L I4
The 2003 Toyota Matrix is equipped with a 1.8L inline-4 engine. Below you'll find detailed b0122 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Malfunction in the theft deterrent system indicator lamp circuit. The security light in the dash does not operate correctly.
Symptoms
- Security light always on
- Security light never illuminates
- Light does not flash when system is armed
- Cannot determine system status
Common Causes
- Burnt out indicator LED
- Instrument cluster fault
- BCM indicator output failure
- Wiring issue
Diagnostic Steps
- Check indicator lamp operation
- Test BCM indicator output
- Inspect cluster wiring
- Check instrument cluster
Repair Notes
Replace indicator lamp/LED in cluster or repair wiring.
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
B0122 on Other Vehicles
Common Questions
What does code B0122 mean on a 2003-2003 Toyota Matrix?
B0122 stands for "Theft Deterrent Indicator Lamp Circuit". Malfunction in the theft deterrent system indicator lamp circuit. The security light in the dash does not operate correctly.
What are the symptoms of B0122 on a Toyota Matrix?
Common symptoms of B0122 include: Security light always on, Security light never illuminates, Light does not flash when system is armed, Cannot determine system status.
What causes B0122 on a 2003-2003 Toyota Matrix?
Common causes of B0122 include: Burnt out indicator LED, Instrument cluster fault, BCM indicator output failure, Wiring issue.
Last updated: March 2026