Ignition Switch Circuit

THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM (w/o Smart Key System): Ignition Switch Circuit

Ignition Switch Circuit

DESCRIPTION

The main body ECU (driver side junction block assembly) 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 TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Select the items below in the Data List and read the display on the Techstream.

Main Body





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

NG -- CHECK HARNESS AND CONNECTOR (BATTERY - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)
OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
2. CHECK HARNESS AND CONNECTOR (BATTERY - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)




(a) Disconnect the 2A driver side junction block assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. INSPECT IGNITION SWITCH ASSEMBLY




(a) Remove the ignition switch assembly Removal for 2GR-FE, Removal for 1AR-FE).
(b) Disconnect the D12 ignition switch assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





Text in Illustration





Result





C -- REPLACE IGNITION SWITCH ASSEMBLY (for 1AR-FE)
B -- REPLACE IGNITION SWITCH ASSEMBLY (for 2GR-FE)
A -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (DRIVER SIDE J/B - DRIVER SIDE J/B)




(a) Disconnect the 2G driver side junction block assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - BODY GROUND)




(a) Disconnect the 2F driver side junction block assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)