Security Indicator Light Circuit

DESCRIPTION

Even when the theft deterrent system is in the disarmed state, the security indicator blinks due to a signal output from the immobilizer system. The security indicator blinks continuously due to a continuous signal received from the immobilizer system while in the armed state.
The multiplex network body ECU causes the security indicator to light up or blink only during the arming preparation state and alarm sounding state.

WIRING DIAGRAM

INSPECTION PROCEDURE

1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER

1. Connect the intelligent tester to the DLC3.

2. Turn the ignition switch on ON.

3. Turn the intelligent tester main switch on.

4. Select the item below in the ACTIVE TEST and then check that the indicator operates.

   BODY (Multiplex network body ECU): 

   Item	Test Details	Diagnostic Note
   Security Indicator	Security indicator ON/OFF	-

   OK:

   The security indicator light blinks or turns off correctly when operating it through the intelligent tester.
   

NG	Go to step 2

OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2. INSPECT MULTI-DISPLAY ASSEMBLY OR CENTER CLUSTER INTEGRATION SWITCH ASSEMBLY (SECURITY INDICATOR)

1. w/ LEXUS navigation system:Check the security indicator.

   1. Remove the multi-display.

   2. Apply battery voltage to the terminals of the multi-display and check the lighting condition of the security indicator.

      Standard:

      Measurement Condition	Specified Condition
      Battery positive (+) → Terminal 1 (HSY) (M2 side) Battery positive (-) → Terminal 3 (GND) (M4 side)	Lights up

      NOTICE:

      1. If the positive (+) lead and the negative (-) lead are incorrectly connected, the security indicator will not light up.
         
      2. Voltage of more than 12 V will damage the security indicator.
         
      3. If the voltage is too low, the security indicator will not light up.
         

2. w/o LEXUS navigation system:Check the security indicator.

   1. Remove the center cluster integration switch.

   2. Apply battery voltage to the terminals of the center cluster integration switch and check the lighting condition of the security indicator.

      Standard:

      Measurement Condition	Specified Condition
      Battery positive (+) → Terminal 4 (LP) Battery positive (-) → Terminal 7 (GND)	Lights up

      NOTICE:

      1. If the positive (+) lead and the negative (-) lead are incorrectly connected, the security indicator will not light up.
         
      2. Voltage of more than 12 V will damage the security indicator.
         
      3. If the voltage is too low, the security indicator will not light up.
         

NG	REPLACE MULTI-DISPLAY ASSEMBLY OR CENTER CLUSTER INTEGRATION SWITCH ASSEMBLY

OK

3. CHECK HARNESS AND CONNECTOR (BODY ECU - MULTI-DISPLAY OR CENTER CLUSTER INTEGRATION SW)

1. w/ LEXUS navigation system:Check the wire harness between the ECU and multi-display.

   1. Disconnect the B6 ECU connector and M2 multi-display connector.

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

      Resistance:

      Symbol (Tester Connection)	Specified Condition
      IND (B6-24) - HSY (M2-1)	Below 1 Ω
      IND (B6-24) or HSY (M2-1) - Body ground	10 kΩ or higher

2. w/o LEXUS navigation system:Check the wire harness between the ECU and integration switch.

   1. Disconnect the B6 ECU connector and C4 switch connector.

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

      Resistance:

      Symbol (Tester Connection)	Specified Condition
      IND (B6-24) - LP (C4-4)	Below 1 Ω
      IND (B6-24) or LP (C4-4) - Body ground	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY OR CENTER CLUSTER INTEGRATION SW - BODY GROUND)

1. w/ LEXUS navigation system:Check the wire harness between the multi-display and the body ground.

   1. Disconnect the M4 multi-display connector.

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

      Resistance:

      Symbol (Tester Connection)	Specified Condition
      GND (M4-3) - Body ground	Below 1 Ω

2. w/o LEXUS navigation system:Check the wire harness between the integration switch and the body ground.

   1. Disconnect the C4 switch connector.

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

      Resistance:

      Symbol (Tester Connection)	Specified Condition
      GND (C4-7) - Body ground	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE INSTRUMENT PANEL J/B ASSEMBLY