Security Indicator Light Circuit

THEFT DETERRENT: THEFT DETERRENT SYSTEM (w/ Smart Key System): Security Indicator Light Circuit

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 immobiliser system. The security indicator blinks continuously due to a continuous signal received from the immobiliser system while in the armed state.
The certification ECU (smart key ECU assembly) causes the security indicator to come on or blink only during the arming preparation state and alarm sounding states.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Connect Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn Techstream main switch on.
(d) Select the item below in the Active Test and then check that the indicator operates.

Smart Key:





OK:
The security indicator light flashes or goes off correctly when operating it through Techstream.
NG -- CHECK HARNESS AND CONNECTOR (SECURITY INDICATOR - CERTIFICATION ECU)
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. CHECK HARNESS AND CONNECTOR (SECURITY INDICATOR - CERTIFICATION ECU)




(a) Disconnect the D40 ECU connector.
(b) Disconnect the E19 connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (SECURITY INDICATOR - BODY GROUND)




(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. INSPECT SECURITY INDICATOR LIGHT




(a) Reconnect the E19 connector, with D40 ECU connector still disconnected.
(b) Apply battery voltage from the wire harness back side between the terminals of the indicator, and check the lighting condition of the security indicator.
Standard :





NOTICE:
- If the positive (+) lead and the negative (-) lead are incorrectly connected, the security indicator will not come on.
- Voltage of more than 12 V will damage the security indicator.
- If the voltage is too low, the security indicator will not come on.

NG -- REPLACE SECURITY INDICATOR LIGHT
OK -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)