Toyota Yaris: Smart Key System (for Start Function) / System Malfunction Message is Displayed on the Multi-information Display

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System (for Start Function) / System Malfunction Message is Displayed on the Multi-information Display

SYSTEM DESCRIPTION

If an abnormal operation that may lead to a malfunction of the steering lock ECU (steering lock actuator or upper bracket assembly), or abnormal vehicle speed information is detected by the certification ECU (smart key ECU assembly), a system malfunction message is displayed on the multi-information display.

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

  • Before replacing the certification ECU (smart key ECU assembly) or steering lock ECU (steering lock actuator or upper bracket assembly), refer to Registration.

    Click here

PROCEDURE

1.

CHECK FOR DTC

(a) Check for DTCs.

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

Result

Proceed to

DTCs are not output

A

DTC is output.

B

B

GO TO SMART KEY SYSTEM (for Entry Function) (DIAGNOSTIC TROUBLE CODE CHART)

A

2.

READ VALUE USING GTS (SENSOR MALFUNCTION HISTORY)

(a) Read the Data List according to the display on the GTS.

Body Electrical > Smart Key > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Sensor Malfunction History

History of malfunction of position sensor in steering lock ECU (steering lock actuator or upper bracket assembly) (DTC B278196 is stored)

OK or NG

OK: History of malfunction for the lock or unlock sensor in the steering lock ECU (steering lock actuator or upper bracket assembly) does not exist.

NG: History of both the lock and unlock sensors in the steering lock ECU (steering lock actuator or upper bracket assembly) being on exists. (Under normal operation, neither sensor is on.)

When NG is displayed, either the position sensor in the steering lock ECU (steering lock actuator or upper bracket assembly) or the assembly itself may be malfunctioning.

Body Electrical > Smart Key > Data List

Tester Display

Sensor Malfunction History

OK:

OK is displayed on the GTS.

NG

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)

OK

3.

READ VALUE USING GTS (NEUTRAL SWITCH / CLUTCH SWITCH)

(a) Read the Data List according to the display on the GTS.

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Neutral Switch / Clutch Switch

State of clutch pedal

OFF or ON

OFF: Clutch pedal released

ON: Clutch pedal depressed

  • Use this item to help determine if the clutch position switch is malfunctioning.
  • The engine cannot be started when this item is "OFF".
Body Electrical > Power Source Control > Data List

Tester Display

Neutral Switch / Clutch Switch

OK:

The GTS display changes correctly in response to the shift lever or clutch pedal operation.

NG

GO TO STEP 9

OK

4.

READ VALUE USING GTS (VEHICLE RUNNING CONDITION (LINE))

(a) Read the Data List according to the display on the GTS.

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Vehicle Running Condition (Line)

Vehicle being driven or stopped

Stop or Driving

Stop: Vehicle stopped

Driving: Vehicle being driven at 5 km/h (3 mph) or more

-

Body Electrical > Power Source Control > Data List

Tester Display

Vehicle Running Condition (Line)

OK:

The GTS display changes correctly in response to the vehicle condition.

NG

GO TO VEHICLE STABILITY CONTROL SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

OK

5.

CHECK HARNESS AND CONNECTOR (POWER SOURCE)

(a) Disconnect the steering lock ECU (steering lock actuator or upper bracket assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H71-1 (GND) - Body ground

Always

Below 1 Ω

NOTICE:

If the result is not as specified, check for looseness in the ground cable connection.

*a

Front view of wire harness connector

(to Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

H71-7 (B) - Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)

(a) Connect the steering lock ECU (steering lock actuator or upper bracket assembly) connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

H71-3 (IGE) - H71-1 (GND)

  • Steering lock motor operating when all conditions met, and then door opened:
    • The steering is unlocked.
    • The ignition switch is off.

11 to 14 V → Below 1 V

*a

Component with harness connected

(Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

OK

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)

NG

7.

CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

(a) Disconnect the H71 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

(b) Disconnect the H46 certification ECU (smart key ECU assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H71-3 (IGE) - H46-24 (SLR+)

Always

Below 1 Ω

H71-3 (IGE) or H46-24 (SLR+) - Other terminals and body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)

(a) Connect the steering lock ECU (steering lock actuator or upper bracket assembly) connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

H71-3 (IGE) - Body ground

Ignition switch off

11 to 14 V

*a

Component with harness connected

(Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)

9.

INSPECT CLUTCH START SWITCH ASSEMBLY

Click here

NG

REPLACE CLUTCH START SWITCH ASSEMBLY

OK

10.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - CLUTCH START SWITCH ASSEMBLY)

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

(b) Disconnect the A64 clutch start switch assembly connector.

(c) Disconnect the A106 ECM connector.

(d) Disconnect the A67 engine stop and start ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H45-10 (STAR) - A106-23 (NSW)

Always

Below 1 Ω

H45-10 (STAR) - A64-2 (B)

Always

Below 1 Ω

H45-3 (STA) or A64-1 (L) - Other terminals and body ground

Always

10 kΩ or higher

H45-10 (STAR) or A106-23 (NSW) - Other terminals and body ground

Always

10 kΩ or higher

H45-10 (STAR) or A64-2 (B) - Other terminals and body ground

Always

10 kΩ or higher

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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