Cruise Control. Dtc P1617 Distance Control Ecu Malfunction

Cruise Control System. Lexus Gs430, Gs300. Uzs190 Grs190

Cruise Control. Lexus Gs430, Gs300. Uzs190 Grs190

DTC P1617 Distance Control ECU Malfunction

DESCRIPTION

In the dynamic radar cruise control system, the ECM and the distance control ECU (cruise control ECU) communicate with one another to control the system based on some designation information. If the designation information of the ECM and distance control ECU is different or the distance control ECU is malfunctioning, this DTC is recorded.

DTC No.	DTC Detection Condition	Trouble Area
P1617	While dynamic radar cruise control is either preparing for operation or operating, if designation signal from ECM and designation return signal from distance control ECU do not match or distance control ECU is malfunctioning for certain amount of time or more	Distance control ECU (Cruise control ECU)

INSPECTION PROCEDURE

NOTICE:

When the distance control ECU is replaced with a new one, initialization must be performed (for LHD, Click here; for RHD, Click here).

1.CONFIRM DESIGNATION INFORMATION

Confirm the designation information.
1. Turn the engine switch on (IG).
2. Turn the cruise control 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 skid control buzzer sounds at this time.
  NOTICE:
  Do not turn the headlight dimmer switch on at this time because the beam axis automatic adjustment mode has already started, which could lead to an incorrect beam axis setting. If the light control switch is turned on by mistake, readjust the beam axis (refer to page for beam axis adjustment).
4. Clear the DTC and then recheck for DTCs.
  OK:
  DTC is not output.
  HINT:
  If the DTC P1617 is still output after replacing the distance control ECU, replace the ECM.

REPLACE DISTANCE CONTROL ECU

SYSTEM OK