Security Indicator Light Does not Blink [12/2019 - 11/2023]: Procedure

1. Check for DTCs.

   Body Electrical > Smart Key > Trouble Codes 

   Powertrain > Engine > Trouble Codes 

   OK

   DTCs are not output.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2019 - 10/2021]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2021 - 10/2022]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2022 - 11/2023] 

Result: 

OK 

See step  2

1. Perform the Active Test according to the display on the GTS.

   Body Electrical > Smart Key > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Immobilizer Indicator	Security indicator light	OFF/ON	-

   Body Electrical > Smart Key > Active Test 

   Tester Display
   Immobilizer Indicator

   OK

   The security indicator light (radio receiver assembly) operates normally.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  4

Result: 

OK 

See step  3

1. When the immobilizer is set, check that the security indicator light (telltale light assembly) blinks.*1

   OK

   The security indicator light (telltale light assembly) blinks normally.

2. When the theft deterrent system is in the arming preparation state, check that the security indicator light (telltale light assembly) illuminates.*2

   OK

   The security indicator light (telltale light assembly) illuminates normally.

   Result

   Result	Proceed to
   *1 is NG (*2 is OK)	A
   *2 is NG (*1 is OK)	B

Result: 

A 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [12/2019 - 11/2023] 

Result: 

B 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

1. Disconnect the H48 certification ECU (smart key ECU assembly) connector.
2. Disconnect the H33 security indicator light (telltale light assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H48-20 (IND) - H33-3 (LP)	Always	Below 1 Ω
   H48-20 (IND) or H33-3 (LP) - Other terminals and body ground	Always	10 kΩ or higher
   H33-4 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Connect the H48 certification ECU (smart key ECU assembly) connector.
2. Connect the H33 security indicator light (telltale light assembly) connector.
3. Using an oscilloscope, check the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

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

   -

   -

   Measurement Condition

   Tester Connection	Condition	Specified Condition
   H48-20 (IND) - Body ground	Ignition switch off → ON	Pulse generation → Below 2 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE SECURITY INDICATOR LIGHT (TELLTALE LIGHT ASSEMBLY). Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - ] 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [12/2019 - 11/2023]