Ignition Switch Circuit

THEFT DETERRENT SYSTEM: Ignition Switch Circuit

Ignition Switch Circuit

DESCRIPTION

When the ignition switch is turned to the ON position, battery positive voltage is applied to terminal IG of the multiplex network body ECU.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSES (ECU-IG NO.1, AM1)
(a) Remove the ECU-IG NO.1 and AM1 fuses from the instrument panel J/B.
(b) Measure the resistance.
Standard resistance:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.
2. INSPECT RELAY (IG1)
(a) Install the ECU-IG NO.1 and AM1 fuses to the instrument panel J/B.





(b) Remove the IG1 relay from the instrument panel J/B.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE RELAY
OK -- Continue to next step.
3. INSPECT IGNITION OR STARTER SWITCH ASSEMBLY
(a) Install the IG1 relay to the instrument panel J/B.





(b) Disconnect the I14 switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE IGNITION OR STARTER SWITCH ASSEMBLY
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (BATTERY - INSTRUMENT PANEL J/B)
(a) Connect the I14 switch connector.





(b) Disconnect the 1A J/B connector.
(c) 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.
5. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B - INSTRUMENT PANEL J/B)





(a) Disconnect the 1I J/B connector.
(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 (INSTRUMENT PANEL J/B (BODY ECU) - BODY GROUND)





(a) Disconnect the 1F J/B connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE