DTC P1616: Communication Error from ECM to Distance Control ECU [12/2013 - 11/2016]: Procedure

WARNING: This page is about a different car, the 2016 Toyota Highlander, 2015 Toyota Highlander, and 2014 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.

REPLACE ECM
1. Replace the ECM with a new one.
  Refer to COMPONENTS [12/2013 - 11/2016]
Result:

NEXT

CHECK FOR DTCS (DTC P1616)

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Clear the DTCs.
Refer to DTC CHECK / CLEAR [12/2013 - 11/2016]
Perform the following to make sure that the DTC detection conditions are met.
HINT:

If the detection conditions are not met, the malfunction cannot be detected.
1. Drive the vehicle at a speed for which cruise control operation is possible.
2. Turn the cruise control main switch on.
Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

Check for DTCs.

Powertrain > Radar Cruise > Trouble Codes

Result

Result	Proceed to
DTCs are not output	A
DTC P1616 is output	B

Turn the engine switch off.

Result: 1

END

Result: 2

REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to COMPONENTS [12/2013 - ]