Ignition Switch Circuit

THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: Ignition Switch Circuit

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 TECHSTREAM
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream main switch 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 -- INSPECT FUSES (AM1, ECU-IG No. 2)
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. INSPECT FUSES (AM1, ECU-IG No. 2)




(a) Remove the AM1 and ECU-IG No. 2 fuses from the main body ECU.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPLACE FUSE
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (BATTERY - MAIN BODY ECU)




(a) Disconnect the DA main body ECU connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:






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

4. INSPECT IGNITION SWITCH ASSEMBLY




(a) Disconnect the H10 ignition switch connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPLACE IGNITION SWITCH ASSEMBLY
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - IGNITION SWITCH AND BODY GROUND)




(a) Disconnect the DD main body ECU connector.
(b) Disconnect the H10 ignition switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU