DTC P1615: Communication Error from Distance Control ECU to ECM [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 DRIVING SUPPORT ECU ASSEMBLY
1. Replace the driving support ECU assembly.
  Refer to COMPONENTS [12/2013 - ]
Result:

NEXT

CHECK FOR DTCS (DTC P1615)

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 dynamic radar cruise control system on using the cruise control main switch (ON-OFF button).
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 P1615 is output	B

Turn the engine switch off.

Result: 1

END

Result: 2

REPLACE ECM. Refer to COMPONENTS [12/2013 - 11/2016]