Nissan Repair Questions? Ask a Mechanic for Answers ASAP
As long as the tool you are using is of a good make and is reliable, the cheapest option for you would be to have the unit sent away to an aftermarket repair specialist.
I would use one that agrees to test it first and let you know the outcome, if the unit for some chance passes then you would need to do a lot of wiring and component testing outside the scope of this thread.
The only other option would be a replacement unit, this would require coding and programming with the equivalent of a main dealer tool, which is likely to be expensive.
I assume that by the point you have gone to the lengths of diagnosing and asking you have tried the usual battery reset and clear codes routing.
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What year and model Nissan is this?
When is comes to a BCM issue that is a internal malfunction the BCM would need to be replaced. Now, when replacing a BCM this is something that requires a scan tool for a few reasons. First is that the new bcm comes blank. You need to save the original BCM's configuration so you can write it to the new BCM. Then after that is done, all the keys for the car will need to be reprogrammed. Then if equip with tire pressure monitoring system, all tire pressure sensors would need to be reprogrammed. This is not something you can do at home unless you have a scanner that can do this.
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You don't have a timing belt. You have a timing chain
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