Ignition Switch Circuit

LIGHTING: LIGHTING SYSTEM: Ignition Switch Circuit
- Ignition Switch Circuit

DESCRIPTION

This circuit detects the state of the ignition switch and sends it to the multiplex network body ECU.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Body / Data List.

(e) Read the display on the Techstream.

Body (Body ECU)





OK:

Normal conditions listed above are displayed.

NG -- INSPECT RELAY

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2. INSPECT RELAY

(a) Inspect ACC relay continuity.





(1) Remove the ACC relay from the instrument panel J/B.

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

Standard resistance:





(b) Inspect IG1 relay continuity.





(1) Remove the IG1 relay from the instrument panel J/B.

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

Standard resistance:





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

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

(a) 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 INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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





Standard voltage:





NG -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
OK -- Continue to next step.

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

(a) Disconnect the connector IF from the instrument panel junction block assembly.

(b) 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.

6. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH CIRCUIT)

(a) Inspect the harness and connectors related to ignition switch, referring to the wiring diagram.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE