Turn Signal Light Circuit

LIGHTING: LIGHTING SYSTEM: Turn Signal Light Circuit
- Turn Signal Light Circuit

DESCRIPTION

Receiving the signal of the turn signal switch from the combination switch ECU, the body ECU turns the turn signal light on.

The driver side junction block ECU activates the flasher relay while the theft deterrent system gives the warning and turns on the turn signal light.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Body / Active Test.

(e) Check the operation.

Body (Body ECU)





OK:

Turn signal lights flash.

NG -- CHECK HARNESS AND CONNECTOR (BATTERY - TURN SIGNAL FLASHER ASSEMBLY)

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

2. CHECK HARNESS AND CONNECTOR (BATTERY - TURN SIGNAL FLASHER ASSEMBLY)

(a) Disconnect the connector from the turn signal flasher.





(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.

3. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH CIRCUIT)

(a) 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 (TURN SIGNAL FLASHER ASSEMBLY - BODY GROUND)

(a) 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. INSPECT TURN SIGNAL FLASHER ASSEMBLY

(a) Inspect turn signal flasher assembly.

OK:

Turn signal flasher assembly is normal.

NG -- REPLACE TURN SIGNAL FLASHER ASSEMBLY
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (TURN SIGNAL FLASHER ASSEMBLY - INSTRUMENT PANEL JUNCTION)

(a) Disconnect the turn signal flasher connector.





(b) Disconnect connectors II and D9 from the instrument panel J/B assembly.

(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 HARNESS AND CONNECTOR (EACH TURN SIGNAL LIGHT CIRCUIT)

(a) Inspect the harness and connectors related to each turn signal light, referring to the wiring diagram.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

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