THEFT DETERRENT SYSTEM (w/o Smart Entry and Start System) Ignition Switch Circuit

DESCRIPTION

The main body ECU determines the ignition switch position (OFF, ACC, ON) based on signals from the IG or ACC circuit.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch to the ON position.

   3. Turn the intelligent tester main switch on.

   4. Select the items below in the Data List and read the display on the intelligent tester.

      Main Body:

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      IG SW	Ignition switch ON signal / ON or OFF	ON: Ignition switch is in the ON position OFF: Ignition switch is OFF	-
      ACC SW	Ignition switch ACC signal / ON or OFF	ON: Ignition switch is in the ACC position OFF: Ignition switch is OFF	-

      OK
      When the ignition switch is operated, the display changes as shown in the table.

   
   

   NG

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

   OK

   PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

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

   
   

   1. 

      Disconnect the 1A junction block connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition 1A-1 - Body ground Ignition switch ON 11 to 14 V

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. INSPECT IGNITION SWITCH ASSEMBLY

   
   

   1. 

      Disconnect the D21 ignition switch connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition 1 - 4 Ignition switch ON Below 1 Ω 2 - 4 Ignition switch ACC Below 1 Ω

   
   

   NG

   REPLACE IGNITION SWITCH ASSEMBLY Click here

   OK

4. CHECK HARNESS AND CONNECTOR

   
   

   1. 

      Disconnect the 1I junction block connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition 1I-4 - 1I-9 Ignition switch ON Below 1 Ω 1I-4 - 1I-3 Ignition switch ACC Below 1 Ω

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

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

   
   

   1. 

      Disconnect the 1F junction block connector.

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

      Standard resistance
      Tester Connection Specified Condition 1F-10 - Body ground Below 1 Ω

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)