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Keyless/Power Door Locks/Security System Symptom Troubleshooting - Keyless operation does not work (LOCK, UNLOCK)

Keyless operation does not work (LOCK, UNLOCK)
NOTE:
  1. Turn the ignition switch to ON (II).
  1. Try to start the engine.
Does the engine start?
YES -
The immobilizer system is OK, go to Step 3 .
NO -
  1. Turn the ignition switch to LOCK (0).
Is the transmitter OK?
YES -
Replace the immobilizer-keyless control unit .■
NO -
Replace the transmitter.■