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LIGHTING SYSTEM > Hazard Warning Switch Circuit

for Preparation Click here


DESCRIPTION

The main body ECU (multiplex network body ECU) receives the hazard switch ON signal and controls the operation of the flasher relay assembly.

WIRING DIAGRAM


E223767E02


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body / Main Body / Data List.

  1. Read the display on the intelligent tester.

    Main Body 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Hazard Switch
    		Hazard switch signal/ON or OFF
    		ON: Hazard switch on
    OFF: Hazard switch off
    		-

    OK:
    Normal conditions listed above are displayed.



NG
Go to step 3
OK


2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body / Main Body / Active Test.

  1. Check that the hazard lights illuminate.

    Main Body 
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Hazard
    		Hazard warning lights
    		ON/OFF
    		-

    OK:
    Hazard lights illuminate.



NG
Go to step 5
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)  

3.INSPECT HAZARD WARNING SIGNAL SWITCH ASSEMBLY


    E223778E01

  1. Remove the hazard warning signal switch assembly (Click here).

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    6 (HAZ) - 3 (GND)
    		Hazard switch on
    		Below 1 Ω
    6 (HAZ) - 3 (GND)
    		Hazard switch off
    		10 kΩ or higher

    Text in Illustration 
    *a
    		Component without harness connected
    (Hazard Warning Signal Switch Assembly)



NG
REPLACE HAZARD WARNING SIGNAL SWITCH ASSEMBLY (Click here)
OK


4.CHECK HARNESS AND CONNECTOR (HAZARD WARNING SIGNAL SWITCH - MAIN BODY ECU)

  1. Disconnect the H17 main body ECU (multiplex network body ECU) connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H82-6 (HAZ) - H17-17 (HZSW)
    		Always
    		Below 1 Ω
    H82-6 (HAZ) - Body ground
    		Always
    		10 kΩ or higher
    H82-3 (GND) - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)  

5.CHECK HARNESS AND CONNECTOR (TURN & HAZ FUSE - TURN SIGNAL FLASHER ASSEMBLY)

  1. Disconnect the H35 turn signal flasher assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    H35-4 (B) - Body ground
    		Always
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H35-7 (E) - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.INSPECT TURN SIGNAL FLASHER ASSEMBLY


    E162022E08

  1. Reconnect the H35 turn signal flasher assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H35-8 (HAZ) - Body ground
    		Hazard switch off
    		9 V or higher
    H35-8 (HAZ) - Body ground
    		Hazard switch on
    		Below 1 V

    Text in Illustration 
    *a
    		Component without harness connected
    (Turn Signal Flasher Assembly)

Result:
Result
Proceed to
NG (when the hazard switch on)
A
NG (when the hazard switch off)
B
OK
B



B
REPLACE TURN SIGNAL FLASHER ASSEMBLY (Click here)
A


7.CHECK HARNESS AND CONNECTOR (TURN SIGNAL FLASHER - HAZARD WARNING SIGNAL SWITCH ASSEMBLY)

  1. Disconnect the H35 turn signal flasher assembly connector.

  1. Disconnect the H82 hazard warning signal switch assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H35-8 (HAZ) - H82-4 (FLSW)
    		Always
    		Below 1 Ω
    H35-8 (HAZ) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.CHECK HARNESS AND CONNECTOR (HAZARD WARNING SIGNAL SWITCH ASSEMBLY - MAIN BODY ECU)

  1. Disconnect the H16 main body ECU (multiplex network body ECU) connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H82-5 (LJB) - H16-3 (HAZ)
    		Always
    		Below 1 Ω
    H82-5 (LJB) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.INSPECT HAZARD WARNING SIGNAL SWITCH ASSEMBLY

  1. Reconnect the H35 turn signal flasher assembly connector.

  1. Reconnect the H82 hazard warning signal switch assembly connector.

  1. Reconnect the H16 main body ECU (multiplex network body ECU) connector.



    E223777E01

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H82-5 (LJB) - Body ground
    		Power switch off
    		11 to 14 V

    Text in Illustration 
    *a
    		Component with harness connected
    (Hazard Warning Signal Switch Assembly)



NG
REPLACE HAZARD WARNING SIGNAL SWITCH ASSEMBLY (Click here)
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)