Toyota RAV4 Service Manual: 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

1. Perform active test by intelligent tester

1. Connect the intelligent tester (with can vim) to the dlc3.
2. Turn the ignition switch on and press the intelligent tester main switch on.
3. Select the item below in the active test and then check the relay operation.

Ok: all hazard warning signal lights flash.

2. Inspect fuse (haz)

1. Remove the haz fuse from the engine room no. 1 Relay block.
2. Measure the resistance of the fuse.

Standard resistance: below 1

3. Check wire harness (turn signal flasher relay - battery)

1. Remove the turn signal flasher relay from the instrument panel junction block.
2. Measure the voltage of the wire harness side connector.

Standard voltage

4. Check operation of turn signal flasher relay (marking: flsh)

1. Replace the turn signal flasher relay with a normally functioning one or a new one.
2. Check that the appropriate turn signal light flashes.
3. Connect the intelligent tester (with can vim) to the dlc3.
4. Turn the ignition switch on and press the intelligent tester main switch on.
5. Select the item below in the active test and then check the relay operation.

Ok: all hazard warning signal lights flash.

Replace turn signal flasher relay

5. Inspect hazard warning signal switch

1. Remove the hazard warning signal switch.
2. Measure the resistance of the switch.

Standard resistance

Repair or replace harness and connector (hazard warning signal switch - body ground)