Theft Deterrent System Ignition Switch Circuit

Vehicle Interior. Corolla. Zre142 Aze141
Theft Deterrent Keyless Entry. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM

CHECK HARNESS AND CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK)

INSPECT IGNITION SWITCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B - INSTRUMENT PANEL J/B)

CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - BODY GROUND)

INSPECT MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK (IG SIGNAL))

CHECK HARNESS AND CONNECTOR (THEFT WARNING ECU ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK)

THEFT DETERRENT SYSTEM - Ignition Switch Circuit


DESCRIPTION

The theft warning ECU assembly determines the ignition switch assembly (off, ON) based on signals from the IG circuit.

WIRING DIAGRAM


Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function).Theft Deterrent System Ignition Switch Circuit


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.READ VALUE USING TECHSTREAM

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Select the items below in the Data List and read the display on the Techstream.

    Security
    Item
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    IG SW
    		Ignition switch ON signal ON/OFF
    		ON: Ignition switch is ON
    OFF: Ignition switch is off
    		-
    OK:
    When the ignition switch assembly is operated, the display changes as shown in the table.


NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (COROLLA_ZRE142 RM0000026P102LX.html)

2.CHECK HARNESS AND CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK)


    Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function).Theft Deterrent System Ignition Switch Circuit

  1. Disconnect the 2G instrument panel junction block connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    2G-1 - Body ground
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR OR ALT FUSE
OK


3.INSPECT IGNITION SWITCH ASSEMBLY


    Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function).Theft Deterrent System Ignition Switch Circuit

  1. Disconnect the E4 ignition switch assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E4-2 (AM1) - E4-4 (IG1)
    		Ignition switch ON
    		Below 1 Ω
    E4-2 (AM1) - E4-4 (IG1)
    		Ignition switch off
    		10 kΩ or higher
    Result:
    Result
    		Proceed to
    OK
    		A
    NG (2AZ-FE)
    		B
    NG (2ZR-FE)
    		C


B
REPLACE IGNITION SWITCH ASSEMBLY (2AZ-FE) (COROLLA_ZRE142 RM0000026VF01LX.html)

C
REPLACE IGNITION SWITCH ASSEMBLY (2ZR-FE) (COROLLA_ZRE142 RM0000026VF01KX.html)
A


4.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B - INSTRUMENT PANEL J/B)

  1. Reconnect the E4 ignition switch assembly connector.



    Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function).Theft Deterrent System Ignition Switch Circuit

  1. Disconnect the 2F instrument panel junction block connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2F-1 - 2F-3
    		Ignition switch ON
    		Below 1 Ω
    2F-1 - 2F-3
    		Ignition switch off
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - BODY GROUND)


    Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function).Theft Deterrent System Ignition Switch Circuit

  1. Disconnect the 2E instrument panel junction block connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2E-17 - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.INSPECT MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK (IG SIGNAL))


    Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function).Theft Deterrent System Ignition Switch Circuit

  1. Reconnect the 2G, 2F and 2E instrument panel junction block connectors.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    2S-7 - Body ground
    		Ignition switch ON
    		11 to 14 V


NG
REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
OK


7.CHECK HARNESS AND CONNECTOR (THEFT WARNING ECU ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK)


  1. Disconnect the E110 theft warning ECU assembly and 2S instrument panel junction block connectors.


    Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function).Theft Deterrent System Ignition Switch Circuit

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E110-9 (IG) - 2S-7
    		Always
    		Below 1 Ω
    E110-9 (IG) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE THEFT WARNING ECU ASSEMBLY (COROLLA_ZRE142 RM00000342K00IX.html)