ENGINE IMMOBILISER SYSTEM > Security Indicator Light Does not Blink

for Preparation Click here

DESCRIPTION

1. The certification ECU (smart key ECU assembly) blinks the security indicator light when the immobiliser is set (the power switch is off).
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
   
2. Before replacing the certification ECU (smart key ECU assembly), refer to the Service Bulletin.
   

1. Connect the intelligent tester to the DLC3.
   

2. Turn the power switch on (IG).
   

3. Turn the intelligent tester on.
   

4. Enter the following menus: Body / Entry&Start / Active Test.
   

5. Perform the Active Test according to the display on the intelligent tester.
   
   

   Entry&Start (Certification ECU (Smart Key ECU Assembly)) 

   Tester Display	Test Part	Control Range	Diagnostic Note
   Immobiliser Indicator	Security indicator light	ON/OFF	The test is possible when the following conditions are met: The key is in the cabin. The power switch is on (IG).

6. Enter the following menus: Body / Main Body / Active Test.
   

7. Perform the Active Test according to the display on the intelligent tester.
   
   

   Main Body (Main Body ECU (Multiplex Network Body ECU)) 

   Tester Display	Test Part	Control Range	Diagnostic Note
   Security Indicator	Security indicator light	ON/OFF	-

   Result:

   Result	Proceed to
   Security indicator light operation is normal performing the "Main Body" and "Entry&Start" Active Test	A
   Security indicator light operation is not normal performing the "Entry&Start" Active Test Security indicator light operation is normal performing the "Main Body" Active Test	B
   Security indicator light operation is normal performing the "Entry&Start" Active Test Security indicator light operation is not normal performing the "Main Body" Active Test	C
   Security indicator light operation is not normal performing the "Main Body" and "Entry&Start" Active Test	D

B	Go to step 2
C	Go to step 3
D	Go to step 5

A
USE SIMULATION METHOD TO CHECK (Click here)

1. Disconnect the H72 indicator light connector.
   

2. Disconnect the H1*1 or H143*2 ECU connector.
   

   1. *1: w/ Entry Function
      
   2. *2: w/o Entry Function
      

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   H1-2 (IND) - H72-16 (LP)*1 H143-2 (IND) - H72-16 (LP)*2	Always	Below 1 Ω
   H1-2 (IND) - Body ground*1 H143-2 (IND) - Body ground*2	Always	10 kΩ or higher

   1. *1: w/ Entry Function
      
   2. *2: w/o Entry Function
      

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

1. Disconnect the H72 indicator light connector.
   

2. Disconnect the 2A junction block connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   2A-51 - H72-16 (LP)	Always	Below 1 Ω
   2A-51 - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

1. Remove the main body ECU (multiplex network body ECU) (Click here).
   

   
   
   
   
   

   Text in Illustration 

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

2. Disconnect the 2A junction block connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   2A-51 - MB-23 (IND)	Always	Below 1 Ω
   2A-51 - Body ground	Always	10 kΩ or higher

NG	REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (Click here)

OK
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)

1. Disconnect the H72 indicator light connector.
   

2. Disconnect the H1*1 or H143*2 ECU connector.
   

   1. *1: w/ Entry Function
      
   2. *2: w/o Entry Function
      

3. Disconnect the 2A junction block connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   H1-2 (IND) - H72-16 (LP)*1 H143-2 (IND) - H72-16 (LP)*2	Always	Below 1 Ω
   2A-51 - H72-16 (LP)	Always	Below 1 Ω
   H72-16 (LP) - Body ground	Always	10 kΩ or higher
   H72-15 (E) - Body ground	Always	Below 1 Ω

   1. *1: w/ Entry Function
      
   2. *2: w/o Entry Function
      

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   H72-9 (M) - Body ground	Power switch off	11 to 14 V

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

1. Temporarily replace the security indicator light (combination switch assembly) with a new or known good one (Click here).
   

2. When the immobiliser is set (the power switch is off), check that the security indicator light blinks.
   

   OK:

   Security indicator light blinks.
   

NG	Go to step 7

OK
END (SECURITY INDICATOR LIGHT WAS DEFECTIVE)

1. Temporarily replace the certification ECU (smart key ECU assembly) with a new or known good one.
   

2. When the immobiliser is set (the power switch is off), check that the security indicator light blinks.
   

   OK:

   Security indicator light blinks.
   

NG	REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)

OK
END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)