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Immobilizer/security indicator blinks

Diagnostic procedure

Symptom troubleshooting - Refer to: Keyless Access System Symptom Troubleshooting - Cannot select ON mode with keyless access and with the keyless remote touching the engine start/stop switch or Keyless Access System Symptom Troubleshooting - All the doors will not lock and unlock or Keyless Access System Symptom Troubleshooting - Immobilizer/security indicator blinks or Keyless Access System Symptom Troubleshooting - The engine starts but stalls immediately or Keyless Access System Symptom Troubleshooting - Cannot select ON mode with keyless access, but can select ON mode with the keyless remote touching the engine start/stop switch or Keyless Access System Symptom Troubleshooting - The doors will not unlock or lock with the keyless remote, but will unlock or lock with the door outer handles

Also check for

Gauge control module
Body control module
PCM
Harness/connections