Hazard Warning Switch Circuit

LIGHTING: LIGHTING SYSTEM: Hazard Warning Switch Circuit
- Hazard Warning Switch Circuit

DESCRIPTION

When the hazard warning signal switch is turned on, the turn signal flasher relay (Marking: FLSH) in the main body ECU turns on to flash the hazard warning signal lights.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

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

(e) Check the operation.

Main Body (Main Body ECU)





OK:

All hazard warning signal lights flash.

OK -- INSPECT HAZARD WARNING SIGNAL SWITCH
NG -- Continue to next step.

2. INSPECT FUSE (HAZ)

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

(b) Measure the resistance of the fuse.

Standard resistance:

Below 1 Ohms

NG -- REPLACE FUSE
OK -- Continue to next step.

3. CHECK WIRE HARNESS (TURN SIGNAL FLASHER RELAY - BATTERY)





(a) Remove the turn signal flasher relay from the instrument panel junction block.

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

Standard voltage:





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

4. CHECK OPERATION OF TURN SIGNAL FLASHER RELAY (Marking: FLSH)

(a) Replace the turn signal flasher relay with a normally functioning one or a new one.

(b) Check that the appropriate turn signal light flashes.

(c) Connect the Techstream to the DLC3.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

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

(g) Check the operation.

Main Body (Main Body ECU)





OK:

All hazard warning signal lights flash.

NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR (JUNCTION BLOCK - HAZARD WARNING SIGNAL SWITCH)

OK -- REPLACE TURN SIGNAL FLASHER RELAY

5. INSPECT HAZARD WARNING SIGNAL SWITCH





(a) Remove the hazard warning signal switch.

(b) Measure the resistance of the switch.

Standard resistance:





NG -- REPLACE HAZARD WARNING SIGNAL SWITCH

OK -- REPAIR OR REPLACE HARNESS AND CONNECTOR (HAZARD WARNING SIGNAL SWITCH - BODY GROUND)