Fog lights don't work

no relay in engine fuse box, fog lamps are controlled by the i/p junction box built into i/p box , you didn't state it but did you test the fog lamp itself with 12 volt jumper wire ? i have seen both bulbs burn out .

We have no idea what vehicle you own.

System Description EKS0058X Control of the fog lamps is dependent upon the position of the combination switch (lighting switch). The lighting switch must be in the 2ND position or AUTO position (LOW beam is ON) for front fog lamp operation.When the lighting switch is placed in the fog lamp position the BCM (body control module) receives input signal requesting the fog lamps to illuminate. When the headlamps are illuminated, this input signal is communicated to the IPDM E/R (intelligent power distribution module engine room) across the CAN communication lines. The central processing unit of the IPDM E/R controls the front fog lamp relay coil. When activated, this relay directs power to the front fog lamps. OUTLINE Power is supplied at all times ? through 15A fuse [No. 43, located in the IPDM E/R (intelligent power distribution module engine room)] ? to front fog lamp relay, located in the IPDM E/R (intelligent power distribution module engine room) ? through 15A fuse [No. 34, located in the IPDM E/R (intelligent power distribution module engine room)] ? to CPU (central processing unit) in the IPDM E/R (intelligent power distribution module engine room). Power is also supplied at all times ? through 50A fusible link (letter f , located in the fuse and fusible link box) ? to BCM (body control module) terminal 55 ? through 10A fuse [No. 21, located in the fuse block (J/B)] ? to BCM (body control module) terminal 42. When the ignition switch is in ON or START position, power is supplied ? to ignition relay, located in the IPDM E/R (intelligent power distribution module engine room) ? through 10A fuse [No. 1 located in the fuse block (J/B)] ? to BCM (body control module) terminal 38. When the ignition switch is in ACC or ON position, power is supplied

Fuse 12--20 amp, under hood fuse block. Is there a two wire connector at fog lamp, if so, the black wire is ground and the other color is voltage, use a test light to check. I didn't check everything for fog lamp control, so if a switch, you may have to check that and wiring circuits.

There is also a relay ! FOG LP fuse # 11 10 amp location , under hood in the engine bay fuse / relay box . FOG LP relay #39 .

RR FOG LP relay #45 , RR FOG fuse #5 10 amp , location rear fuse box .
The fog lamp relays are computer controlled , by BCM

Edward, fuse box above drivers feet under dash.
you may want to check out attached links for fog light problems.
07 Es350 Fog light relay Club Lexus Forums

Lexus ES 350 fog lights fuse location Google Search

Replace Fuse 2007 2012 Lexus ES350 2008 Lexus ES350 3 5L V6

Fog Lights Not Working

there is usually a label on the cover or on a attached label somewhere around the fuse panel if not directly on fuse panel.

maybe the lights are just out. you might just have to replace them.

Hello,
Well there is a fuse for your fog lights. I don't have the make year or model so I can't say where but there is a fuse. More than likely in the under the dash fuse panel. If your having trouble finding the fuse you can still check to see if it is the bulbs. Swap a working bulb with a suspected bad bulb and see if it lights up. If both are out then find that fuse and see if it is blown. Might be your fog light switch too.
Regards, Tony

Consult your Car Owner manual to locate where the Fuse Box is located: Check the appropriate fuse(s) for the appliances in your car that are not working - I suspect that the AirCon, RearWiper and Fog lights are sharing the same fuse as it would be extremely unusual to have 3 separates fuses blown at the same time. ps. The Polo usually has some spare fuses in/near the Fuse Box.