How do you replace the flasher on a 1999 Nissan Altima?

The 1999 Nissan Altima's flasher relay location isn't consistently documented as being under the dash or in the fuse box like many other vehicles. It's often integrated into the BCM (Body Control Module). This makes replacement more complex than simply swapping a relay.

Therefore, directly replacing a standalone flasher relay like in older cars is likely NOT possible on a 1999 Altima.

Here's what you should do instead:

1. Consult your owner's manual: This is the best starting point. It may specify the location and replacement procedure for your specific Altima model.

2. Check online forums and repair manuals: Search for "1999 Nissan Altima flasher relay replacement" or "1999 Nissan Altima turn signal problem" on forums like Nissan Forums or others dedicated to car repair. These forums often have detailed guides from people who have tackled similar issues. Repair manuals (like those from Haynes or Chilton) offer detailed diagrams and instructions, but may cost money.

3. Diagnose the problem accurately: Before assuming it's the flasher, make sure it's not a blown fuse, a faulty turn signal switch, a bad bulb, or wiring issue. A multimeter can help test these components. A malfunctioning flasher usually manifests as erratic flashing, rapid flashing, or no flashing at all.

4. Consider professional help: If you are uncomfortable working with car electronics, it's best to take your Altima to a qualified mechanic. Improperly working with the BCM could cause further problems. The mechanic can properly diagnose the issue and make the necessary repairs.

In short: Don't expect to find a simple flasher relay to replace. The solution likely involves more complex diagnostics and potentially repair or replacement of a more integrated module. Consult your owner's manual and online resources first. If unsure, seek professional help.