Inspection Procedure

1. If this DTC is output, confirm the designation information by following the procedures below.
   1. Turn the ignition switch on (IG).
   2. Push the ON-OFF button of the cruise main switch on.
   3. With the brake pedal depressed, push the cruise control main switch to RES / ACC 3 times within 3 seconds. Check that the VSC buzzer sounds at this time.
      NOTE: Do not turn the headlight dimmer switch on at this time because the optical axis automatic adjustment mode has already started, which could lead to incorrect optical axis. If the light control switch is turned on by mistake, readjust the optical axis (refer to See ADJUSTMENT  for optical axis adjustment).
   4. Clear the DTC and then recheck for DTCs.

      OK: 

      DTC is not output. 

      HINT:

      If DTC P1617 is still output after performing the above procedures, replace the distance control ECU.

      • If the DTC P1617 is still output after replacing the distance control ECU, replace the ECM.

NG: REPLACE CRUISE CONTROL ECU 

OK: SYSTEM OK