Toyota RAV4 Service Manual: Headlight relay circuit
Description
When the light control switch, located on the headlight dimmer switch, is turned to the head position, the head relay illuminates the headlights.
Wiring diagram
Inspection procedure
- Perform active test by intelligent tester (headlight)
- Connect the intelligent tester (with can vim) to the dlc3.
- Turn the ignition switch on and press the intelligent tester main switch on.
- Select the item below in the active test and then check the relay operation.
Ok: headlight comes on
- Inspect fuse (head ll, head rl)
- Remove the head ll fuse and head rl fuse from the engine room no. 2 Relay block.
- Measure the resistance of the fuses.
Standard resistance:
below 1 
- Inspect headlight relay (marking: head)
- Remove the headlight relay from the engine room no. 2 Relay block.
- Measure the resistance of the relay.
Standard resistance 
- Inspect bulb (headlight bulb)
- Remove the headlight bulbs (low).
- Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1, then check that the bulb illuminates.
Ok: bulb illuminates.
- Check wire harness (main body ecu - battery)
- Disconnect the e15 main body ecu connector.
- Measure the voltage of the wire harness side connector.
Standard voltage 
- Check instrument panel junction block (main body ecu)
- Measure the voltage of the main body ecu.
Standard voltage 
Repair or replace harness and connector (head relay - headlight bulb and body ground)
- Check wire harness (headlight dimmer switch - main body ecu)
- Disconnect the e17 main body ecu connector.
- Disconnect the e12 headlight dimmer switch connector.
- Measure the resistance of the wire harness side connectors.
Standard resistance
- Inspect headlight dimmer switch
- Disconnect the e12 headlight dimmer switch.
- Measure the resistance of the switch.
Standard resistance 
Repair or replace harness and connector (headlight dimmer switch - body ground)
Stop light switch circuit
Description
When the stop light switch is turned on, current flows to the stop lights to
illuminate them.
Wiring diagram
Inspection procedure
Inspect fuse (stop)
Remove the stop fus ...
Drl relay circuit
Description
The main body ecu controls the daytime running light no. 2 Relay (marking:
drl no.2).
Wiring diagram
Inspection procedure
Inspect daytime running light relay (marking: drl no. ...
Other materials:
Speaking on the phone
The following screen is displayed when speaking on the phone.
To adjust the call volume
Select “-” or “+”. You can also adjust the volume using the steering
switches or the volume knob.
To prevent the other party from hearing your voice
Select “mute”.
Inputting tones
When usin ...
Sleep operation failure of occupant classification ecu
Description
During sleep mode, the occupant classification ecu reads the condition of
each sensor while the ignition
switch is off.
In this mode, if the occupant classification ecu detects an internal
malfunction, dtc b1796 is output.
Inspection procedure
Check for dtc
T ...
Diagnostic trouble code chart
If a dtc is displayed during the dtc check, check the circuit
listed in the table below and proceed to the page given.
Hint:
*1: "Comes on" means the malfunction indicator lamp
(mil) illuminates.
*2: "Dtc stored" means the ecm memorizes the
malfunction code if the ecm ...