Interior Light Circuit

LIGHTING (INT): LIGHTING SYSTEM: Interior Light Circuit
- Interior Light Circuit

DESCRIPTION

The interior lights are controlled by the main body ECU LH based on various signals received through BEAN communication.

The main body ECU LH includes a MOS-FET (Metal Oxide Semiconductor - Field Effect Transistor) circuit that fades the interior lights in and out by duty control.

This MOS-FET circuit has an overheat protection function as a fail-safe.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK PERSONAL LIGHT (OPERATION)

HINT
The personal lights and interior lights share the same power source circuit. Therefore, if none of them come on, inspect the power source circuit first.

(a) Push the personal light switches.

(b) Check that the personal lights come on.

OK:

Personal lights come on.

NG -- CHECK HARNESS AND CONNECTOR (POWER SOURCE)
OK -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Body No. 3 / Active Test.

(e) Check that the interior lights operate.

Body No. 3 (Main Body ECU LH)





OK:

Interior lights come on.

NG -- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - MAP LIGHT ASSEMBLY)

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Interior Lighting System

3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - MAP LIGHT ASSEMBLY)

(a) Disconnect the Q3 main body ECU LH connector.





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

Standard Voltage:





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - MAP LIGHT ASSEMBLY)

OK -- REPLACE MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH)

4. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - MAP LIGHT ASSEMBLY)

(a) Disconnect the Q3 main body ECU LH connector.





(b) Disconnect the R5 map light assembly connector.

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

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAP LIGHT ASSEMBLY Personal Light

5. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

(a) Disconnect the R5 map light assembly connector.





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

Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAP LIGHT ASSEMBLY Personal Light