Step Illumination Circuit

LIGHTING: LIGHTING SYSTEM: Step Illumination Circuit
- Step Illumination Circuit

DESCRIPTION

The multiplex network body ECU receives information regarding the door lock position switch and engine switch, and turns on each step light. It also receives shift information and controls the illumination.

WIRING DIAGRAM







PROCEDURE

1. CHECK OPERATION OF FOOT LIGHT AND ILLUMINATION LIGHT

(a) When a door is opened, check that the appropriate light illuminates.

Result:





E -- REPLACE INTERIOR ILLUMINATION LIGHT (FRONT RH SEAT)

D -- REPLACE INTERIOR ILLUMINATION LIGHT (FRONT LH SEAT)

C -- REPLACE FOOT LIGHT (RH)

B -- REPLACE FOOT LIGHT (LH)
A -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Select the ACTIVE TEST, use the Techstream to generate a control command, and then check that the step light illuminates.

Body (Multiplex network body ECU)





OK:

Step light illuminates.

NG -- INSPECT FUSE (DOME, D/C CUT)

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

3. INSPECT FUSE (DOME, D/C CUT)

(a) Remove the DOME fuse from the engine room No. 1 relay block.

(b) Remove the D/C CUT fuse from the engine room No. 1 relay block.

(c) Measure the resistance of the fuses.

Standard resistance:

Below 1 Ohms

NG -- REPLACE FUSE

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

4. REPLACE FOOT LIGHT (LH)

(a) Temporarily replace the foot light (LH) with a new or normally functioning one.

(b) Check that the foot light illuminates.

OK:

Foot light illuminates.

OK -- END
NG -- Continue to next step.

5. CHECK WIRE HARNESS (FOOT LIGHT (LH) - BATTERY)

(a) Disconnect the K17 light 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.

6. CHECK WIRE HARNESS (FOOT LIGHT (LH) - MULTIPLEX NETWORK BODY ECU)

(a) Disconnect the K17 light connector.





(b) Disconnect the K68 ECU connector.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR

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

7. REPLACE FOOT LIGHT (RH)

(a) Temporarily replace the foot light (RH) with a new or normally functioning one.

(b) Check that the foot light illuminates.

OK:

Foot light illuminates.

OK -- END
NG -- Continue to next step.

8. CHECK WIRE HARNESS (FOOT LIGHT (RH) - BATTERY)

(a) Disconnect the K49 light 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.

9. CHECK WIRE HARNESS (FOOT LIGHT (RH) - MULTIPLEX NETWORK BODY ECU)

(a) Disconnect the K49 light connector.





(b) Disconnect the K68 ECU connector.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR

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

10. REPLACE INTERIOR ILLUMINATION LIGHT (FRONT LH SEAT)

(a) Temporarily replace the illumination light (front LH seat) with a new or normally functioning one.

(b) Check that the illumination light illuminates.

OK:

Illumination light illuminates.

OK -- END
NG -- Continue to next step.

11. CHECK WIRE HARNESS (INTERIOR ILLUMINATION LIGHT (REAR LH SEAT) - BATTERY)

(a) for Rear LH

(1) Disconnect the b12 light connector.





(2) Measure the voltage of the wire harness side connector.

Standard voltage:





(b) for Rear LH No. 2

(1) Disconnect the b17 light connector.





(2) Measure the voltage of the wire harness side connector.

Standard voltage:





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

12. CHECK WIRE HARNESS (INTERIOR ILLUMINATION LIGHT (REAR LH SEAT) - MULTIPLEX NETWORK BODY ECU)

(a) for Rear LH

(1) Disconnect the b12 light connector.





(2) Disconnect the K68 ECU connector.

(3) Measure the resistance of the wire harness side connectors.

Standard resistance:





(b) for Rear LH No. 2

(1) Disconnect the b17 light connector.





(2) Disconnect the K68 ECU connector.

(3) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR

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

13. REPLACE INTERIOR ILLUMINATION LIGHT (FRONT RH SEAT)

(a) Temporarily replace the illumination light (front RH seat) with a new or normally functioning one.

(b) Check that the illumination light illuminates.

OK:

Illumination light illuminates.

OK -- END
NG -- Continue to next step.

14. CHECK WIRE HARNESS (INTERIOR ILLUMINATION LIGHT (REAR RH SEAT) - BATTERY)

(a) for Rear RH

(1) Disconnect the a12 light connector.





(2) Measure the voltage of the wire harness side connector.

Standard voltage:





(b) for Rear RH No. 2

(1) Disconnect the a21 light connector.





(2) Measure the voltage of the wire harness side connector.

Standard voltage:





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

15. CHECK WIRE HARNESS (INTERIOR ILLUMINATION LIGHT (REAR RH SEAT) - MULTIPLEX NETWORK BODY ECU)

(a) for Rear RH

(1) Disconnect the a12 light connector.





(2) Disconnect the K68 ECU connector.

(3) Measure the resistance of the wire harness side connectors.

Standard resistance:





(b) for Rear RH No. 2

(1) Disconnect the a21 light connector.





(2) Disconnect the K68 ECU connector.

(3) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR

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