I have a lexus nx 200t installed an amp and subwoofer sub was making a sound like a heartbeat and heard a humming noise coming from the front someplace so I disconnected the amp power from the battery and now the car won't start. When I hit the button to start. In accessory mode parking brake warning comes on dash lights and headlights blink rapidly gradually going faster. How do I fix this?

 

What I would do is disconnect the battery for about 10+ minutes to allow everything to reset. Works for some electrical situations, and easy to do

 

Ty for the suggestion, but tried that already no change.

 

your owner's manual provides instructions on emergency start, p. 574

"When the engine does not start, the following steps can be used as an interim measure to start the engine if the engine switch is functioning normally:
1. Set the parking brake.
2. Shift the shift lever to P.
3. Turn the engine switch to ACCESSORY mode. (*)
4. Press and hold the engine switch for about 15 seconds while depressing the brake pedal firmly.
Even if the engine can be started using the above steps, the system may be malfunctioning. Have the vehicle inspected by your Lexus dealer"

(*) to get to Accessory mode, press the engine switch without depressing the brake!

Good luck!

 

Check all the fuses, including the big ones by the battery.

 

If you can screw up a sub install like that, you should have the vehicle towed to a professional mechanic to be fixed.

 

No offence but I wonder if you can re-write your sentence with proper punctuation, so that the description of your problem is clear, not as mud

e.g. "I have a lexus nx 200t installed an amp and subwoofer sub was making a sound like a heartbeat and heard a humming noise coming from the front someplace
=> I had my lexus nx 200t installed with an amp and a subwoofer. Then (what) was making a sound like a heartbeat? Then I heard a humming noise coming from the front somewhere (?)

"so I disconnected the amp power from the battery and now the car won't start". Can you confirm in the process of doing this, did you disconnect the battery while installing the sub and the amp, then your re-connected the battery?

The Manual p.499 provides some info after re-connecting the battery, as attached.

I am intrigued, and grasping at straws ...

Another thought, it may have something to do with the immobilizer?

 

Another thought: as I review the battery jump start procedure, I am most curious why step #5 is needed, see attached?

Then, I found a post in this thread that seems to relate to the issue, which requires driver door open and close?
https://www.clublexus.com/forums/gs-...ml#post9639990

The plot thickens

 

Thank you everyone for taking the time to try and figure this out. This was my 1st time installing an amp and sub. I did a lot of research online b4 the install but still learning. What I believe happened is from testing the sub and amp in accessory mode it drained the battery. It was late at night and I didn't want to start up the car blasting music. I was working from my garage. I had the door closed so I didn't disturb the neighbors. This is also my 1st time dealing with a push to start car so when all the lights were flashing I panicked lol. Anyway I took the battery to AutoZone for testing and it drained down to 7 volts I believe he said. He told me the battery was still good just needed to be charged but it's already almost 5 years old. So I bought a new battery and kept the old 1 to recharge. Also I purchased a battery with higher cranking amps. Next just have to figure out if I need a new alternator to help support the sub or if there is something else I can do to prevent it from maybe draining again. Soon as I installed the new battery everything was back to normal. So any suggestions for amp and sub would be much appreciated. Ty

 

I was listening to music in Accessory mode, then I got cut-off automatically by the auto battery saving function of the NX. I wonder how why this did not happen to you?

I don't think you need a new alternator, just for the amp and sub, unless it has symptoms of bearing worn-out noise, or end of life.

 

Before, not b4. This is a forum, not bingo.

 

I'm sorry my shorthand text bothers you, didn't realize my publications were going to be graded lol.