Toyota RAV4 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

1. Read value of intelligent tester (engine immobiliser system)

1. Connect the intelligent tester (with can vim) to the dlc3.
2. Turn the ignition switch on with a key that cannot start the engine.
3. 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.

2. Check whether engine starts with other key

1. Check whether the engine starts with the vehicle's other keys.

Ok: engine starts.

3. Read value of intelligent tester (transponder key coil)

1. Connect the intelligent tester (with can vim) to the dlc3.
2. Turn the ignition switch on with a key that cannot start the engine.
3. 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.

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

1. Disconnect the e46 ecu connector.
2. Disconnect the e5 amplifier connector.
3. Measure the resistance of the wire harness side connectors.

Standard resistance

5. Check transponder key amplifier (operation)

1. Temporarily replace the transponder key amplifier with a new or normally functioning one..
2. Check that the engine starts normally

Ok: engine starts normally.

End (transponder key amplifier is defective)