Yamaha XSR 900 2022 Service Manual page 682

4. Turn the main switch to "ON".
Is DTC displayed?
YES
→ Go to step 5.
NO
→ Service is completed.
5. Replace the main switch/immobilizer unit, ECU and all key, and complete the service.
Refer to "REPLACING THE ECU (Engine Control Unit)" on page 8-41.
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56_IMMOBILIZER