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Home >> Suzuki >> 2013 >> Grand Vitara Base >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Immobilizer Control System >> Diagnostic Information and Procedures >> DTC P1621: Immobilizer Communication Line Error >> Detecting Condition and Trouble Area
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Detecting Condition and Trouble Area

Detecting Condition Trouble Area
Communication error between ICM and ECM is detected by ECM.
  • Related fuse(s) blown
  • Poor connection at ICM connector
  • Poor connection at ECM connector
  • Open in power supply wire circuit
  • Open in ground wire circuit
  • Open in communication wire circuits
  • Short to ground wire circuit in communication wire circuits
  • Short to power supply wire circuit in communication wire circuits
  • Short of communication wire circuits
  • ICM faulty
  • ECM faulty