Serial Communication Circuit Inspection

■ Check short in serial communication line 

1. "IG KEY OFF".
2. Disconnect Smartkey Module connector and PCM connector.
3. Measure resistance between serial communication signal terminal of PCM harness connector and chassis ground.

   Specification:  Infinite (∞)

4. Is the measured resistance within specification?

   YES 

   • Go to open in harness as follow.

   NO 

   • Check short to ground in harness. And then, repair or replace as necessary. Finally, go to "Verification of Vehicle Repair " procedure.

■ Check open in harness 

1. IG KEY OFF.
2. Disconnect Smartkey Module connector and PCM connector.
3. Measure resistance between signal terminal of Smartkey Module harness connector and signal terminal of PCM harness connector.

   Specification:  About below 1Ω

4. Is the measured resistance within specification?

   YES 

   • Check poor connection between harness connector and Smartkey Module or PCM.

   : Thoroughly check the looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Repair or replace as necessary and then, go to "Verification of Vehicle Repair " procedure.

   NO 

   • Check open in signal harness. And, repair or replace as necessary then, go to "Verification of Vehicle Repair " procedure.