Fi7e Posted March 29 Share Posted March 29 Just checking to see if this is normal. Figured my car either wouldn’t run or have CEL’s on if it wasn’t. Quote Link to comment Share on other sites More sharing options...
RX400h Posted March 30 Share Posted March 30 Do you have access to the wiring diagram? I agree that it is likely that the fuse should be there. Quote Link to comment Share on other sites More sharing options...
paulo57509 Posted April 1 Share Posted April 1 You have a Celsior so it may be normal. It's not normal on a NA LS. My '98 has a relay in that position. Here is the circuit that contains the Engine Main Relay: From factory 1998 Lexus LS400 Electrical Wiring Diagrams Double-click the image so you can see it. Essentially, the relay powers the electric cooling fan and the front seat heater (if equipped). This relay doesn't appear to run thru any of the many ECU's that an LS has. That's why you won't see any trouble codes. A previous owner probably removed the relay as an expedient to taking the time to troubleshoot whatever the issue it was causing. Quick check: Does the cooling fan come on? If you have heated seats, do they warm? Quote Link to comment Share on other sites More sharing options...
Fi7e Posted April 2 Author Share Posted April 2 12 hours ago, paulo57509 said: You have a Celsior so it may be normal. It's not normal on a NA LS. My '98 has a relay in that position. Here is the circuit that contains the Engine Main Relay: From factory 1998 Lexus LS400 Electrical Wiring Diagrams Double-click the image so you can see it. Essentially, the relay powers the electric cooling fan and the front seat heater (if equipped). This relay doesn't appear to run thru any of the many ECU's that an LS has. That's why you won't see any trouble codes. A previous owner probably removed the relay as an expedient to taking the time to troubleshoot whatever the issue it was causing. Quick check: Does the cooling fan come on? If you have heated seats, do they warm? Interesting, thank you. My fan does turn on, I just checked that 2 days ago and I do not have heated seats… Quote Link to comment Share on other sites More sharing options...
Fi7e Posted April 7 Author Share Posted April 7 Resolved. My car doesn’t need a “Main Engine” relay. Quote Link to comment Share on other sites More sharing options...
paulo57509 Posted April 14 Share Posted April 14 On 4/7/2024 at 1:29 PM, Fi7e said: Resolved. My car doesn’t need a “Main Engine” relay. What did you do to solve the problem? It might help someone else in the future. Quote Link to comment Share on other sites More sharing options...
Fi7e Posted April 15 Author Share Posted April 15 I didn’t do anything to resolve the “problem”. My Celsior doesn’t need that relay. My fan is hydraulic and I don’t have heated seats. Quote Link to comment Share on other sites More sharing options...
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