No crank No start after head unit install

I went to install a head unit recently and didn't have the appropriate adapter or knowledge to do it right so I cut the radio connector off the harness, stripped and connected all color matching wires. Worked before on my Tercel. No power to head unit. Kept messing with it and I most likely touched wires that shouldn't have touched. Called it a day and went to turn the truck on and nothing happened. No crank no start. All fuses are fine. lights work, cluster works, locks and windows work, sounds like relays are working. Noticed blinkers do not work, hazards do. I dont have a multimeter but i have a fuse tester so I went after the neutral safety switch, starter constant and starter relay connector. All light up. Not getting power to red and yellow wires for radio. ended up jumping the starter relay to turn the truck on. I am not good with electronics. Should not have had battery connected. Looking for solutions or what to check next. Thanks

 

Probably not going to get the help you need here online where we can't see the wiring. Impossible for anyone to give help with the information given.

Hooking up color for color doesn't always mean its correct especially with no harness. I'd suggest trying to splice it back without the head unit and get her running again. Then get the correct harness and go from there.

 

i have disconnected everything having to do with the radio til i can fix the no crank issue.
ignore the radio issue and imagine you have a car that gets power with no lockouts with ignition, no blown fuses and relays are good but it doesnt crank unless you bypass the starter relay. where would you go from there

 

Well considering you said you chopped the harness make sure everything is back and connected good.

Does the normal lights come on when turning the key to on before cranking? I mean shit could be just be a coincidence that your starter or starter solenoid took a shit at the exact same time.

 

I'm glad you can admit your failings

OK, first you need to factory wiring diagram (I get PDF Factory Service Manuals from ebay for like $15). Then you need to understand the ignition circuit. There may or may not be in-line fuses that need testing that you don't see. Wiring diagrams look crazy at first until you run through the explanation sections that break it down.

You know that from the starter relay, it will crank if the relay gets 12v. Now, you have to track it back to the ignition switch and find out why the ignition switch and the ECU aren't agreeing to sending it 12v. Pray you haven't hurt the ECU.

 

thats where i get lost, in the wire chasing. i definitely need a good complete diagram, and a multimeter. this sucks

 

Correct. You really do need the factory wiring diagram and a multimeter.

The diagram will give you the wire colors and the connector locations. You can chase the wire on the diagram and you don't need to chase it through the harness and connectors of the car. NEVER WORK ON A MODERN CAR WITHOUT THE WIRING DIAGRAM.

From what I can see, the ECU doesn't really get in the way of the starting circuit on this car. (The car should still crank even if the ECU is toast and the car won't start).

On my diagram, there is a Green and Black wire coming from the ignition switch. This (with the ignition switch on) feeds 12v through a 7.5A fuse and becomes a black wire that splits. Now it's 2 black wires and one goes to the Parking\Neutral switch and the other to the NSW pin on the ECU. From the Parking\Neutral switch it turns into a Black and White wire which also splits. Those 2 Black and White wires...one goes to the STA pin on the ECU and the other to the Starter Relay.

Bottom line...if my diagram is correct for your year car...12v is not getting from the Ignition switch to the Parking\Neutral switch then to the starter relay.

Are you sure the car transmission selector is in Park?

 

I'm re-reading your first post.

I'm troubled that the blinkers are not working. Are they working now?

Is EVERYTHING is back to working except the no-start issue?

 

thanks for helping guys. blinkers still do not work. went to check it out again and no progress has been made. think im going to jump the relay again so i can drive to the shop and get a multimeter. no progress will be made without one.

 

Not sure what year you got but here you go.

https://techinfo.toyota.com/techInf..._request_url=https://techinfo.toyota.com:443/

And good luck.

 

Does it have an alarm system in it?

 

not that i can see. has stock security light but ive never seen it light up. no key fob. dont security systems let you crank but not start?

 

Just depends on how they are wired. The one in my F350, if armed will not crank.

 

Was the cd player you pulled out an in dash ( with a screen) or just a regular cd player? In dashes have to be wired to the parking/neutral safety switch. Wondering if you screwed something up when you pulled it out.

 

Yeah he screwed up the wiring by chopping it all.

I'd ask for a pic but I'm kinda scared. Probably going to be hard but what the hell send a pic maybe something obvious.

 

I'm afraid that since your blinkers still don't work, you've hooked shit up all wrong. There are some blinker wires that have similar colors to the ignition switch circuit.

Take it to a shop and just pay whatever.

 

if i had money for that i would have never come here for help. heres what i know so far: starter is good, starter relay is good, i can jump the starter and turn the car on, i have full control of locks and windows. i obtained a multimeter if anyone knows where to go from here

***SLIGHT UPDATE*** blinkers are functioning again. i didn't realize the hazards had to be plugged in. 1 less issue to deal with.

 

OK, yes, the button for the hazards needs to be hooked up. IF everything but the ignition is working, you probably have a single issue to track down.

Go look at my post (#7) above regarding the wire colors and connections. There may be enough info for you to figure it out.

Get the FSM, which will have the wiring diagram and junction locations:
https://www.ebay.com/itm/374264429790

 

Its nearly impossible for us to tell you where to go because we don't know how bad you cut everything.

Best bet is to get a manual and make sure every wire you chopped goes back correctly. Ditch the head unit at this point just to get back to where you were before you started. Just being honest but the questions you are asking its going to be a long road.

 

going to route a wire externally from where ignition switch should be sending power to where relay should be getting power and see if i can start it. if it starts then im probably looking at a broken wire in that corresponding part of the harness eh? unless the radio being plugged in is crucial to the car starting which cant be the case right? im pretty sure i drove the car with head unit out but before i messed with wiring.