Toyota RAV4 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:
Active test
Hint:
Performing an active test enables components
including the relays, vsv (vacuum switching valve) and
actuators, to be operated without removing any parts.
The active test can be performed with the intelligent
tester. Performing the active test as the first step of
troubleshooting is one ...
Diagnostic trouble code chart
Hint:
If no abnormality is found when inspecting parts, check the
skid control ecu and check for poor contact at the ground
points.
If a dtc is displayed during the dtc check, check the
circuit for the dtc listed in the table below. For details of
each dtc, refer to the page indicated. ...
Check mode procedure
Description
Check mode has a higher sensitivity to malfunctions
and can detect malfunctions that normal mode
cannot detect. Check mode can also detect all the
malfunctions that normal mode can detect. In check
mode, dtcs are detected with 1 trip detection logic.
Check mode pro ...