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: Hello I have a 2009 nissan murano and it's overheating do you know what the problem could be?

If you have replaced the thermostat, there could be a couple of other issues relating the cooling system, such as the coolant fan switch relay or a clogged system. The coolant fan switch relay tells the coolant fans when to...

Q: Buying Advice on 1999 Toyota Camry, LE Used Miles:233,000...Should i buy it?

I would suggest checking the Kelly Blue Book website with specifics related to your zip code as market prices of cars vary by zip code. This will give you a baseline for determining whether or not the car is within...

Q: metallic buzzing/vibrating noise when accelerating.

Can you create the noise when the vehicle is stationary, in neutral, at any engine RPM level? If not, then the origin is more likely to be the clutch/transmission especially if the sound is closer a buzz/whine than "metallic" buzzing...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.