Ignition Switch Circuit

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

DESCRIPTION

This circuit detects the state of the ignition switch or engine switch, and sends it to the main body ECU.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect Techstream to the DLC3.

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

(c) Turn Techstream on.

(d) Select the following menu items: Body Electrical / Main Body / Data List.

(e) Read the display on Techstream.

Main Body:

OK:

Normal conditions listed above are displayed.

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG -- Continue to next step.

2. INSPECT ACC RELAY

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

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

Standard resistance:

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

3. INSPECT NO. 1 IGNITION RELAY

(a) Remove the No. 1 ignition relay from the instrument panel J/B assembly.

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

Standard resistance:

NG -- REPLACE NO. 1 IGNITION RELAY
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B ASSEMBLY - BATTERY AND GROUND)

(a) Disconnect the IA instrument panel J/B assembly connector.

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

Standard voltage:

(d) 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.

5. CHECK VEHICLE CONDITION

(a) Check the vehicle condition.

Result:

B -- CHECK HARNESS AND CONNECTOR (BATTERY - MAIN BODY ECU)
A -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B ASSEMBLY - IGNITION SWITCH)

(a) Disconnect the E23 ignition switch connector.

(b) Disconnect the II instrument panel J/B assembly connector.

(c) 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.

7. INSPECT IGNITION SWITCH

(a) Inspect the ignition switch Testing and Inspection

OK:

Ignition switch is normal.

NG -- REPLACE IGNITION SWITCH

OK -- REPLACE INSTRUMENT PANEL J/B ASSEMBLY

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

(a) Disconnect the E7 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.

9. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B ASSEMBLY - MAIN BODY ECU)

(a) Disconnect the E7 main body ECU connector.

(b) Disconnect the II instrument panel J/B assembly connector.

(c) 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.

10. CHECK HARNESS AND CONNECTOR (ENGINE SWITCH - MAIN BODY ECU AND BODY GROUND)

(a) Disconnect the E52 engine switch connector.

(b) Disconnect the E7 main body ECU connector.

(c) 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.

11. INSPECT ENGINE SWITCH

(a) Inspect the engine switch Component Tests and General Diagnostics.

OK:

Engine switch is normal.

NG -- REPLACE ENGINE SWITCH

OK -- REPLACE INSTRUMENT PANEL J/B ASSEMBLY