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CANBus? ODB? on Lexus SC300

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Old 09-17-14, 09:15 AM   #1
FastCars99
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Exclamation CANBus? ODB? on Lexus SC300

I'm rather confused, does the 1992 Lexus SC300 have CANBUS? 3 wire? 2 wire? How would I know? I've had some trouble trying to find where a service manual exists for a 1992 Lexus SC300 because it seems lots of collectors resell them for hundreds of dollars.

When I try the Lexus Website, it only shows specific sections of what seems to be the owners manual. Any idea? I know it doesn't have ODB, but does my car use CANBUS? Am I going to need a load resistor to mimic a normal bulb due to CANBUS? (Cars with a ECU that detects a low-wattage bulb assume that the bulb is bad, and turn off power. Only to realize that the wattage goes "up" as the voltage decreases, which then causes the power to turn back on.. thus creating a endless loop of on/off causing flickering..)

Wiki and searches only bring up CANBus bulbs.. but not what version of CANBus is used, or if it's used at all with the 1992 Lexus SC300. Thanks for any reply
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Old 09-17-14, 11:02 AM   #2
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http://en.wikipedia.org/wiki/CAN_bus

SC doesn't have Can bus.
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Old 09-18-14, 11:23 PM   #3
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OP, the 1992-2000 SC's use many individual ECUs and relays for all functions. I believe CanBus may have begun with the 2001+ SC430 which had multiplex ECUs to cover many functions at once but I will stop short of stating that even the 430 models used CanBus.

These cars, though complicated, handle OEM and aftermarket wiring the old fashioned way.
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Old 09-19-14, 09:09 AM   #4
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these cars are very basic obd1 and 96+ is obd2. its not an audi where everything is canbus.
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Old 09-19-14, 10:15 AM   #5
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Inifiniti G35 has can bus, and I think my 02 GS300 also has can bus.
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Old 09-19-14, 11:15 AM   #6
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that probably makes those models harder to swap, wonder how those guys get the vvti gte swaps in there so cleanly. I can't say I haven't thought about building one I like the model GS you have. throw in a manual swap at the same time that could be a real fun sleeper.
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Old 09-19-14, 11:38 AM   #7
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98-2001 GS300 is easy since it's not Can bus, 02+ is pita you will lose a lot of functions.

Yeah G35 are a ***** to swap unless you are building a race car.
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Old 09-19-14, 02:24 PM   #8
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Canibus, where??
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Old Yesterday, 10:36 AM   #9
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Huh? CAN is a communication protocol, it has nothing to do with how bulb resistance is detected. I mean, maybe the thing that detects it can communicate over CAN to another ECU to tell it about what it has detected, but that has nothing to do with the detection itself. The communication could use any protocol... like K-line (ISO-9141) for example.

CAN is a relatively new protocol... I think the earliest occurrences of it that I've heard of are from the mid-90s. And it's NOT used on the diagnostic OBD port on any Lexuses before 2006. Older Lexuses use ISO-9141 or variants thereof for OBD diagnostics.

Also, it's OBD (On-Board Diagnostics), not ODB (Ol' Dirty Bastard)
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