Toyota Avalon (XX50): Power Source Mode does not Change to ON (IG). Precaution. Problem Symptoms Table

Power Source Mode does not Change to ON (IG)

DESCRIPTION

If the engine switch is pressed with the electrical key transmitter sub-assembly in the cabin, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
• The smart key system (for Start Function, Gasoline Model) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function, Gasoline Model) after confirming that the communication systems are functioning properly.

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• Make sure that no DTCs are output. If any DTCs are output, proceed to Diagnostic Trouble Code Chart.
• If the smart key system (for Start Function, Gasoline Model) has been disabled, enable the system before performing troubleshooting.

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• Inspect the fuses of circuits related to this system before performing the following procedure.
• Before replacing the certification ECU (smart key ECU assembly), refer to Registration.

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• After completing repairs, confirm that the problem does not recur.
• After performing repairs, confirm that no DTCs are output by performing "DTC Output Confirmation Operation."

PROCEDURE

(a) Using the Techstream, check for certification ECU (smart key ECU assembly) DTCs.

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

(a) Measure the voltage according to the value(s) in the table below. Standard Voltage: Tester Connection Condition Specified Condition G40-17 (IG1D) - Body ground Engine switch off → Engine switch on (ACC) 1 V or less → 9 V or higher

*a Component with harness connected (Certification ECU (Smart Key ECU Assembly))

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK

(a) Disconnect the 4A, 4D, 4L and 4K instrument panel junction block assembly connectors.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Remove the instrument panel junction block assembly.

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(b) Connect all of the instrument panel junction block assembly connectors.

(c) Connect the G40 certification ECU (smart key ECU assembly) connector.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

OK

(a) Remove the IG2 NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(b) Disconnect the 4F instrument panel junction block assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition 3 - 5 Battery voltage not applied between terminals 1 and 2 10 kΩ or higher 3 - 5 Battery voltage applied between terminals 1 and 2 Below 1 Ω

*1 IG2 NO. 1 Relay

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE IG2 NO. 1 RELAY

Precaution

PRECAUTION

CAUTION REGARDING INTERFERENCE WITH ELECTRONIC DEVICES

CAUTION:

As weak radio waves are emitted from the electrical key transmitter sub-assembly, if a pacemaker is being used, be sure to read the pacemaker instruction manual and the following.

• People with implantable cardiac pacemakers, cardiac resynchronization therapy-pacemakers or implantable cardioverter defibrillators should keep away from the smart key system antennas. The radio waves may affect the operation of such devices. If necessary, the entry function can be disabled. Ask your dealer for details, such as the frequency of radio waves and timing of the emitted radio waves. Then, consult your doctor to see if you should disable the entry function.

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• User of any electrical medical device other than implantable cardiac pacemakers, cardiac resynchronization therapy-pacemakers or implantable cardioverter defibrillators should consult the manufacturer of the device for information about its operation under the influence of radio waves. Radio waves could have unexpected effects on the operation of such medical devices.
• Ask your dealer for details for disabling the smart key system.

HINT:

The smart key system can be disabled by a customize setting.

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PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL

NOTICE:

When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected.

PRECAUTION WHEN USING TECHSTREAM

(a) When the engine switch is turned off, the DTCs stored in the steering lock ECU (steering lock actuator or upper bracket assembly) will be cleared. Be sure to record any output DTCs immediately.

(b) When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.

PRECAUTIONS FOR BATTERY

(a) If the battery became discharged and then was charged or the cable was disconnected and reconnected to the (-) battery terminal, the steering lock may not be released and the engine may not be able to be started unless the driver door is opened and closed with the engine switch off.

(b) After the battery is removed and reinstalled, be sure to wait at least 10 seconds before the next engine start. The engine may not start immediately after the battery is reinstalled.

HINT:

• After disconnecting and reconnecting a cable to the battery, the engine may not start on the first attempt. If this occurs, turn the engine switch off. The engine will start normally from the second time onward.
• When a cable to the battery is disconnected and reconnected, the power source mode returns to the mode it was in before the cable was disconnected.

PRECAUTION FOR REGISTRATION

(a) If replacing any of the following parts, refer to registration procedure.

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(1) Certification ECU (smart key ECU assembly)

(2) Steering lock ECU (steering lock actuator or upper bracket assembly)

(3) ECM

(4) Electrical key transmitter sub-assembly

(5) Main body ECU (multiplex network body ECU)

(6) DCM (telematics transceiver)*

• *: for Toyota Entune Remote Connect Compatible Type

PRECAUTIONS FOR STEERING LOCK / UNLOCK FUNCTION

(a) After turning the engine switch off and opening and closing any of the doors, the steering wheel will be locked due to the steering lock function. Operating the engine switch again automatically cancels the steering lock function.

(b) To prevent the steering lock motor from overheating, the motor operation may be suspended if the steering is locked and unlocked repeatedly in a short period of time. In this case, refrain from operating the engine switch. After about 10 seconds, the steering lock motor will resume functioning.

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

• Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
• Inspect the fuses and relays related to the system before inspecting the suspected areas below.
• If the problem occurs in certain locations or times of day, the possibility of wave interference is high.
• If a malfunction occurred after optional components were installed by the dealer, check if there is wave interference from the components.

• *: for Toyota Entune Remote Connect Compatible Type