Toyota RAV4 (XA40) 2013-2018 Service Manual: Taillight relay circuit
Description
When the light control switch, located on the headlight dimmer switch, is turned to the tail position, the taillight relay (marking: t-lp) turns on to illuminate the front side marker lights, rear taillights, side marker lights and license plate light.
Wiring diagram
Inspection procedure
- Check whether lights illuminate
- Check whether the following lights illuminate: front side marker lights, rear taillights, side marker lights and license plate light.
- Inspect fuse (tail)
- Remove the tail fuse from the instrument panel junction block.
- Measure the resistance of the fuse.
Standard resistance:
below 1 
- Check wire harness (battery - instrument panel junction block)
- Disconnect the ig instrument panel junction block connector.
- Measure the voltage of the wire harness side connector.
Standard voltage 
- Check wire harness (main body ecu - headlight dimmer switch)
- Disconnect the e15 main body ecu connector.
- Disconnect the e12 headlight dimmer switch connector.
- Measure the resistance of the wire harness side connectors.
Standard resistance 
- Check wire harness (battery - headlight dimmer switch)
- Connect the e15 main body ecu connector.
- Disconnect the e12 headlight dimmer switch connector.
- Measure the voltage of the wire harness side connector.
Standard voltage 
- Check wire harness (headlight dimmer switch - body ground)
- Disconnect the e12 headlight dimmer switch connector.
- Measure the resistance of the wire harness side connector.
Standard resistance 
- Inspect headlight dimmer switch
- Remove the headlight dimmer switch.
- Measure the resistance of the switch.
Standard resistance 
Replace instrument panel junction block
- Check instrument panel junction block (taillight relay)
- Disconnect the ib instrument panel junction block connector.
- Measure the voltage of the junction block.
Standard voltage 
- Check wire harness (taillight relay - front side marker light and body ground)
- Disconnect the a12 and a24 front side marker light connectors.
- Measure the voltage and resistance of the wire harness side connectors.
Standard resistance 
standard resistance 
Replace bulb
- Check wire harness (main body ecu - rear combination light)
- Disconnect the k12 and k14 rear combination light connectors.
- Measure the voltage and resistance of the wire harness side connectors.
Standard voltage 
Standard resistance 
Replace rear combination light
- Check wire harness (main body ecu - license plate light and body ground)
- Disconnect the q6 license plate light connector.
- Measure the voltage and resistance of the wire harness side connector.
Standard voltage 
Standard resistance 
Replace bulb
- Check wire harness (main body ecu - rear combination light)
- Disconnect the k12 and k14 rear combination light connectors.
- Measure the voltage and resistance of the wire harness side connectors.
Standard voltage 
Standard resistance 
Replace bulb
Illumination circuit
Description
The main body ecu receives information regarding the door courtesy switch and
door lock position
switch, and turns on the room light.
Wiring diagram
Inspection procedure
Perf ...
Headlight assembly
Components
Removal
Hint:
Use the same procedures for the rh and lh sides.
The procedures listed below are for the lh side.
Disconnect cable from negative battery
terminal
Rem ...
Other materials:
How to proceed with troubleshooting (2006/01- )
Hint:
Use these procedures to troubleshoot the air conditioning
system.
*: Use the intelligent tester.
Vehicle brought to workshop
Customer problem analysis and symptom check
Inspect battery voltage
Standard voltage:
11 to 14 v
If the voltage is below 11 v, recharg ...
Cooling fan motor
On-vehicle inspection
Inspect no. 1 Cooling fan motor
Disconnect the no. 1 Fan connector.
Connect the battery and ammeter to the no. 1 Fan
motor connector.
Check that the no. 1 Fan rotates smoothly, and then
check the reading on the ammeter.
Standard amperage ...
Engine (ignition) switch
(vehicles with smart key
system)
Performing the following
operations when carrying
the electronic key on your
person starts the engine or
changes engine switch
modes.
Starting the engine
1. Pull the parking brake switch
to check that the parking
brake is set.
The parking brake indicator will
come on.
2. Check that the shift lever i ...
