Toyota Yaris: Smart Key System (for Start Function) / Power Source Mode does not Change to ON (IG)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System (for Start Function) / 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.

Related Data List and Active Test Items

Problem Symptom

Data List and Active Test

Power source mode does not change to on (IG) but does change to on (ACC)

Power Source Control
  • Power Supply Condition
  • IGP Relay Circuit (Outside) Monitor
  • IGP Relay Circuit (Inside) Monitor
  • IGR Relay Circuit (Outside) Monitor
  • IGR Relay Circuit (Inside) Monitor

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

    Click here

  • 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) has been disabled, enable the system before performing troubleshooting.

    Click here

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

    Click here

  • 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."

HINT:

  • If interior verification is unsuccessful, Vehicle Control History may be stored.
  • If Vehicle Control History has been stored, refer to the Vehicle Control History List to determine the detection conditions and narrow down trouble areas.
Body Electrical > Smart Key > Utility

Tester Display

Vehicle Control History (RoB)

PROCEDURE

1.

CHECK FOR DTC

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

Body Electrical > Power Source Control > Trouble Codes Body Electrical > Smart Key > Trouble Codes

Result

Proceed to

DTCs are not output

A

Smart key system (for Start Function) DTCs are output

B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

2.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) AND BODY GROUND)

(a) Disconnect the H45 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the 4B and 4C power distribution box assembly connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H45-24 (IGPD) - 4C-17

Always

Below 1 Ω

H45-11 (IGRD) - 4B-11

Always

Below 1 Ω

4B-36 - Body ground

Always

Below 1 Ω

H45-24 (IGPD) or 4C-17 - Other terminals and body ground

Always

10 kΩ or higher

H45-11 (IGRD) or 4B-11 - Other terminals and body ground

Always

10 kΩ or higher

(d) Connect the H45 certification ECU (smart key ECU assembly) connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

H45-11 (IGRD) - Body ground

Ignition switch ACC → Ignition switch ON

1 V or less → 9 V or higher

H45-24 (IGPD) - Body ground

Ignition switch ACC → Ignition switch ON

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

4.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - POWER SOURCE)

(a) Disconnect the H45 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the 4D and 4H power distribution box assembly connectors.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

4H-1 - Body ground

Ignition switch off

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK POWER DISTRIBUTION BOX ASSEMBLY

(a) Remove the power distribution box assembly.

Click here

(b) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

*a

Component without harness connected

(Power Distribution Box Assembly)

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4C-17 - 4D-13

Always

Below 1 Ω

(d) Connect the auxiliary battery terminal (+) to the 4C-17 terminal.

(e) Connect the auxiliary battery terminal (-) to the 4B-36 terminal.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4H-1 - 4C-34

Auxiliary battery voltage applied between terminals 4C-17 and 4B-36

Below 1 Ω

4H-1 - 4B-38

Auxiliary battery voltage applied between terminals 4C-17 and 4B-36

Below 1 Ω

(g) Connect the auxiliary battery terminal (+) to the 4B-11 terminal.

(h) Connect the auxiliary battery terminal (-) to the 4B-36 terminal.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4H-1 - 4C-34

Auxiliary battery voltage applied between terminals 4B-11 and 4B-36

Below 1 Ω

4H-1 - 4B-38

Auxiliary battery voltage applied between terminals 4B-11 and 4B-36

Below 1 Ω

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

OK

6.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - IGP RELAY)

(a) Disconnect the 4D power distribution box assembly connector.

(b) Remove the IGP relay.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4D-13 - No. 1 engine room relay block assembly IGP relay terminal 1

Always

Below 1 Ω

No. 1 engine room relay block assembly IGP relay terminal 2 - Body ground

Always

Below 1 Ω

4D-13 or No. 1 engine room relay block assembly IGP relay terminal 1 - Other terminals and body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

INSPECT IGP RELAY

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

Standard Resistance::

Tester Connection

Condition

Specified Condition

3 - 5

Auxiliary battery voltage applied between terminals 1 and 2

Below 1 Ω

Auxiliary battery voltage not applied between terminals 1 and 2

10 kΩ or higher

*1

IGP relay

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR

NG

REPLACE IGP RELAY

    Power Source Mode does not Change to ON (IG and ACC)

    DESCRIPTION When the ignition switch cannot be turned to ACC or ON, interior verification may be abnormal or there may be a malfunction in the ACC relay or IG relay circuit...

    Power Source Mode does not Change to ON (ACC)

    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...

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