Ignition Switch Circuit

THEFT DETERRENT SYSTEM: Ignition Switch Circuit

Ignition Switch Circuit

DESCRIPTION

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

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

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





(a) Remove the IG1 relay from the instrument panel J/B.
(b) Check the resistance of the relay.
Standard resistance:





NG -- REPLACE IGNITION RELAY NO. 1
OK -- Continue to next step.
3. INSPECT IGNITION SWITCH ASSEMBLY





(a) Measure the resistance of the switch.
Standard resistance:





NG -- REPLACE IGNITION SWITCH ASSEMBLY
OK -- Continue to next step.
4. CHECK WIRE HARNESS (INSTRUMENT PANEL J/B ASSEMBLY - BATTERY)





(a) Disconnect the 2A J/B connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
5. CHECK WIRE HARNESS (INSTRUMENT PANEL J/B ASSEMBLY - IGNITION SWITCH ASSEMBLY)





(a) Disconnect the 2G J/B connector.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
6. CHECK WIRE HARNESS (INSTRUMENT PANEL J/B ASSEMBLY - BODY GROUND)





(a) Disconnect the 2F J/B connector.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:





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