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post #1 of 6 (permalink) Old Yesterday, 08:44 PM Thread Starter
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Unhappy Do blown or removed fuses leave codes?

2017 RAV Limited Hybrid.
In the process of finding a circuit to tap into to power LED fog lamps I lost the DRLs and then the horn.
Technique for DRLS:

1. Turned on DRLs and they lit.

2. Turned off DRLs
3. Removed DRL fuse

4. Turned light stalk to auto.

5. DRLs didn't light which is what you would expect.
6. Returned fuse to its proper location.
7. Turned on DRLs and they didn't light.
Technique for horn: Repeat steps 1-6 above replacing appropriate terms for horn.
7. Pushed horn pad and it didn't honk.


Several days ago I had a fuse blow on another circuit. Display showed messages indicating "Hybrid System Malfunction -Visit Dealer"
"Collision Alert Malfunction -Visit Dealer" and some thing that essentially read "Cooling system over heated - pull over in .3 miles." Found and replaced blown fuse which caused the Over Heating message to disappear. Drove to dealer next morning and they diagnosed some codes that they reset. I said all this to ask the question in my title. "Do blown or removed fuses leave codes in the OBD/OBD 2?"

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post #2 of 6 (permalink) Old Yesterday, 10:09 PM
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Originally Posted by dadrett41 View Post
"Do blown or removed fuses leave codes in the OBD/OBD 2?"
Only if it effects one of the main systems. So its not the fuse causing the error, its the system shut-down. A fuse that serves only lights won't cause an error code.

2016 Hybrid Limited with ATP.
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post #3 of 6 (permalink) Old Today, 02:12 AM Thread Starter
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Originally Posted by rdgrimes View Post
Only if it effects one of the main systems. So its not the fuse causing the error, its the system shut-down. A fuse that serves only lights won't cause an error code.


Thanks for the response. Makes sense. Care to elaborate on this? What do you mean by system shut-down? Did I cause a system shut-down? If so what did I do and how do I correct it? Don't want it to happen again. I'd rather the dealer not know that I'm "messing" with the electrics again

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post #4 of 6 (permalink) Old Today, 08:22 AM
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Need to make the distinction between OBDII codes (emission related) and system codes (any other vehicle system). If by "OBD" codes you mean you mean non-emission codes then fuses will definitely cause them but w/o a CE light. And whereas OBDII codes that set the CE can be cleared with a basic code reader, others such as those that involve safety systems can only be cleared by the dealer or an all-systems scanner. That must be what the dealer did when "they diagnosed some codes that they reset" likely due to the fuse you blew that shut down the systems you mentioned.

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Greetings Dr. D,


Thanks for your reply. I was hoping & fairly certain you would chime in on this. If I'm understanding correctly, sounds as though you're saying if certain fuses are blown or removed and they involve safety systems a code/codes must be cleared by a more sophisticated scanner. I wouldn't think DRLs and horns to be part of safety systems. At least not critical systems. Should I expect a shop that claims to specialize in Toyota repair to have the all-systems scanner you referring to?

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Yes, any competent shop will have the necessary readers/scanners. These days they can't do business w/o them.

And yes, DRLs and horns are part of safety systems not Emissions critical systems that set OBDII CE light codes.
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