Q: Techstream cannot communicate and "Handshake" with RES ECU for 2015 Toyota Venza w/smart key. Help.

asked by on

I have a 2015 Toyota Venza w/smart key. I've installed a factory remote engine start in my car. I cannot get Techstream (not Techstream lite) to communicate or "handshake" with the RES ECU. What am I doing wrong? Please help. Any advice with pictures to show would be greatly appreciated. Thanks a million.

My car has 10400 miles.
My car has an automatic transmission.

I would first refer to the unit LED Diagnostics and Troubleshooting in the installation instructions because it first has to be determined if there is a problem with the install (wiring issues, connections) or configuration. Also, you want to check for firmware updates both on the vehicle and in the unit in case that is an issue. The electrical installation of the RES system, both the component wiring and the order of operation, is very very detailed. So, in a situation like this, you do want to first verify that every single install detail has been covered and unit LED diagnostics might help. If, after all that, the Techstream is still not communicating, the recommended service is an electrical components diagnostic - vehicle programming and a certified mechanic would diagnose the issue for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Techstream cannot communicate and "Handshake" with RES ECU for 2015 Toyota Venza w/smart key. Help.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My car keeps stalling during idle. It has low RPM and hesitates while accelerating. There is also an engine knock.

There are several different issues going on with your 1994 Toyota Corolla. The lack of power, rough idle, and stalling are likely related. Common causes for these symptoms are bad spark plugs, fuel filter, fuel pump, coil, plug wires, alternator,...

Q: Is it normal for a car to jerk a bit back when you make a stop

It sounds like your vehicle may be a bit low on transmission fluid or you may potentially have a bad transmission control solenoid. As you know, the transmission works on hydraulic pressure built up from the fluid inside and uses...

Q: Is There a video showing how to do this

Hello, we do not have repair videos available at this time. We do offer the service to come out and replace the alternator for you, and you can find out more about that here. Otherwise, look to the internet and...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.