Component Tests and General Diagnostics

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 assembly 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 (HAZARD)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester on.
(d) Enter the following menus: Body Electrical / Main Body / Active Test / Hazard.
(e) Check the hazard warning signal light while operating the hazard function using the tester.

Main Body (Main Body ECU)





OK:
The hazard warning signal light is flash when operating it through the Techstream.
NG -- INSPECT FUSE (HAZ)
OK -- Continue to next step.
2. INSPECT TELLTALE LIGHT ASSEMBLY (HAZARD WARNING SIGNAL SWITCH)




(a) Remove the telltale light assembly Removal.
(b) Inspect hazard warning signal switch.
(1) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Reinstall the telltale light assembly.
NG -- REPLACE TELLTALE LIGHT ASSEMBLY
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (HAZARD WARNING SIGNAL SWITCH - MAIN BODY ECU, BODY GROUND)




(a) Disconnect the F17 telltale light assembly connector.
(b) Disconnect the 4S main body ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(d) Reconnect the telltale light assembly connector.
(e) Reconnect the main body ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU
4. INSPECT FUSE (HAZ)




(a) Remove the HAZ fuse from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Reinstall the HAZ fuse.
NG -- REPLACE FUSE
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (HAZ FUSE - MAIN BODY ECU)




(a) Disconnect the 4B main body ECU connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:





(c) Reconnect the main body ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BODY GROUND)




(a) Disconnect the 4E main body ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Reconnect the main body ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. INSPECT MAIN BODY ECU
(a) Remove the main body ECU.




(b) Remove the turn signal flasher assembly from the main body ECU.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(d) Reinstall the turn signal flasher assembly.
(e) Reinstall the main body ECU.
NG -- REPLACE MAIN BODY ECU
OK -- REPLACE TURN SIGNAL FLASHER ASSEMBLY