System Malfunction Message is Displayed on the Multi-information Display [07/2020 - 12/2021]: Procedure

1. Check for DTCs.

   Body Electrical > Smart Key > Trouble Codes 

   Body Electrical > Power Source Control > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output	A
   DTC is output.	B

Result: 

B 

GO TO SMART KEY SYSTEM (for Entry Function) (DIAGNOSTIC TROUBLE CODE CHART). Refer to  DIAGNOSTIC TROUBLE CODE CHART [07/2020 - 12/2021] 

Result: 

A 

See step  2

1. 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 B2781-96 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.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY). Refer to  DISASSEMBLY [07/2020 - 12/2021] 

Result: 

OK 

See step  3

1. 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.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2020 - ] 

Result: 

OK 

See step  4

1. Disconnect the E54 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E54-1 (GND) - Body ground	Always	Below 1 Ω

   NOTE:

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

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   E54-7 (B) - Body ground	Always	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Connect the E54 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   E54-3 (IGE) - E54-1 (GND)	Steering lock motor operating when all conditions met, and then door opened: The steering is unlocked. The ignition switch is off. The shift lever is in P.	11 to 14 V → Below 1 V

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY). Refer to  DISASSEMBLY [07/2020 - 12/2021] 

Result: 

NG 

See step  6

1. Disconnect the E54 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
2. Disconnect the E52 certification ECU (smart key ECU assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E54-3 (IGE) - E52-24 (SLR+)	Always	Below 1 Ω
   E54-3 (IGE) or E52-24 (SLR+) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

1. Connect the E54 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   E54-3 (IGE) - Body ground	Ignition switch off	11 to 14 V

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [07/2020 - ] 

Result: 

NG 

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY). Refer to  DISASSEMBLY [07/2020 - 12/2021]