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:
Open in stop light switch circuit
Description
The skid control ecu detects the brake operating conditions through a signal
transmitted by the stop light
switch. The skid control ecu incorporates an open circuit detection circuit.
This dtc is set under either of
the following conditions:
An open is detected in the stop lig ...
Terminals of ecm
Check ecm
Disconnect the a9 and b30 connectors.
Measure the voltage and resistance of the wire
harness side connectors.
If the result is not as specified, there may be a
malfunction on the wire harness side. ...
Removal
Hint:
Use the same procedures for the rh side and lh side.
The procedures listed below are for the lh side.
Remove front pillar cover sub-assembly upper lh
Using a moulding remover, detach the 3 clips and
remove the pillar cover.
...
