Scuff Plate Light Circuit

LIGHTING: LIGHTING SYSTEM: Scuff Plate Light Circuit

Scuff Plate Light Circuit

DESCRIPTION

The operation timing of the scuff plate lights is the same as that of the front and rear interior lights.
The scuff plate lights turn on when a door is opened, and turn off when the door is closed. This illumination setting can be canceled using the overhead J/B switch.
In addition, the scuff plate lights blink while the theft deterrent system is sounding an alarm.
The turning on and off of the scuff plate lights is 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 scuff plate lights in and out by duty control.
This MOS-FET circuit has an overheat protection function as a fail-safe. If the main body ECU LH becomes excessively hot, the scuff plate lights turn off and remain off.
Normal operation will resume when the conditions required to turn on the scuff plate lights are met again.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. 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 the operation.

Body No. 3 (Main Body ECU LH):





OK:
The scuff plate light LH and RH come on.
Result:






D -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C -- CHECK HARNESS AND CONNECTOR (POWER SOURCE OF SCUFF PLATE LIGHT)
B -- INSPECT SCUFF PLATE LIGHT (FRONT RH)
A -- Continue to next step.
2. INSPECT SCUFF PLATE LIGHT (FRONT LH)




(a) Remove the scuff plate light.
(b) Connect the (+) lead from the battery to terminal 2 and the (-) lead to terminal 1, and then check that the scuff plate light comes on.
OK:
The scuff plate light comes on.
NG -- REPLACE SCUFF PLATE LIGHT
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (SCUFF PLATE LIGHT - BODY GROUND)




(a) Disconnect the Q8 scuff plate light 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.
4. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - SCUFF PLATE LIGHT)




(a) Disconnect the Q8 scuff plate light connector.
(b) Disconnect the LA main body ECU LH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU LH (COWL SIDE J/B LH)
5. INSPECT SCUFF PLATE LIGHT (FRONT RH)




(a) Remove the scuff plate light.
(b) Connect the (+) lead from the battery to terminal 2 and the (-) lead to terminal 1, and then check that the scuff plate light comes on.
OK:
The scuff plate light comes on.
NG -- REPLACE SCUFF PLATE LIGHT
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (SCUFF PLATE LIGHT - BODY GROUND)




(a) Disconnect the P2 scuff plate light 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.
7. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - SCUFF PLATE LIGHT)




(a) Disconnect the P2 scuff plate light connector.
(b) Disconnect the LA main body ECU LH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU LH (COWL SIDE J/B LH)
8. CHECK HARNESS AND CONNECTOR (POWER SOURCE OF SCUFF PLATE LIGHT)
HINT:
- If neither of the scuff plate lights comes on as a result of the ACTIVE TEST, there may be problems in the power source and main body ECU LH.
- Perform the following inspection on either the LH or RH side.




(a) Disconnect the Q8 or P2 scuff plate light connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
Front Door LH





Front Door RH





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU LH (COWL SIDE J/B LH)