Toyota RAV4 (XA40) 2013-2018 Service Manual: Communication

Description
When a key is inserted into the ignition key cylinder but no communication
occurs between the key and
transponder key ecu, dtc b2796 is output. When a key is inserted into the
ignition key cylinder but a
communication error occurs between the key and transponder key ecu, dtc b2798 is
output.
Wiring diagram

Inspection procedure
- Read value of intelligent tester (engine immobiliser system)
- Connect the intelligent tester (with can vim) to the
dlc3.
- Turn the ignition switch on with a key that cannot start
the engine.
- On the intelligent tester, enter the following menus:
diagnosis / obd/mobd / immobiliser / data list
/ immobiliser. Read the result.

Ok:
unset (key is in ignition key cylinder) appears on
the screen.

- Check whether engine starts with other key
- Check whether the engine starts with the vehicle's other
keys.
Ok:
engine starts.

- Read value of intelligent tester (transponder key coil)
- Connect the intelligent tester (with can vim) to the
dlc3.
- Turn the ignition switch on with a key that cannot start
the engine.
- On the intelligent tester, enter the following menus:
diagnosis / obd/mobd / immobiliser / data list
/ antenna coil. Read the result.

Ok:
normal (transponder key coil is normal) appears
on the screen.

- Check wire harness (transponder key ecu - transponder key amplifier)

- Disconnect the e46 ecu connector.
- Disconnect the e5 amplifier connector.
- Measure the resistance of the wire harness side
connectors.
Standard resistance 

- Check transponder key amplifier (operation)
- Temporarily replace the transponder key amplifier with a
new or normally functioning one..
- Check that the engine starts normally
Ok:
engine starts normally.

End (transponder key amplifier is defective)
Description
This dtc is output when a key code that has not been registered in the
transponder key ecu is inserted
into the ignition key cylinder.
Inspection procedure
Reregister key
...
Description
This dtc is output when a communication error occurs between the transponder
key amplifier and
transponder key ecu. Some possible reasons for the communication error are: 1) 2
or ...
Other materials:
Shifting the shift lever
Vehicles without a smart key system
While the engine switch is in the
“on” position, move the shift
lever with the brake pedal depressed.
When shifting the shift lever between p and d, make sure that the
vehicle is completely stopped.
Vehicles with a smart key system
While the en ...
Ecm communication stop mode (2006/01- )
Description
Wiring diagram
Inspection procedure
Notice:
Turn the ignition switch off before measuring the resistances of the
main wire and branch
wire.
After the ignition switch is turned off, check that the key reminder
warning system and light
reminder warning system ...
Rear seat outer belt assembly
Components
...