No blinkers, reverse lights, Shifter locked, and more!

I’ve exhausted the threads in reading so it’s time to ask for help.

I’ve got a 2009 Tacoma that tows a trailer for pressure washing. The other night I noticed a problem which includes the following:
no blinkers, no reverse lights, no back up camera, shifter locked, no trailer lights, no shift lever indicator light, airbag light on dash, maintainance required light on dash, no ac function but blower works.

I am able to drive the vehicle using the shifter lock override next to the shifter but all the previous stated problems still exist. Using the threads it seemed to be that the most common problem was the IG1 NO.2 10Amp fuse being blown. That fuse is good, along with every other fuse on the car. I checked them all. I even used a voltmeter to check continuity across the fuse and replaced with new fuses just to be sure. I have 12v power at the fuse box at stated fuse location. The problem is the same with or without the trailer connected.

I thought it could be a short but it isn’t blowing a fuse.

Any ideas?

 

Is this only while towing? What happens if you unplug the trailer wiring?

 

This happens with or without the trailer connected. I actually disconnected the wiring harness tail before the trailer connector on the truck just to be sure I wasn’t shorting out at the connector.

 

Dang, I dunno. Let me make a call

 

My buddy said to try and replace the fuse anyway, but without being there not much he can to do help.

hopefully this will bump and someone here can be of more assistance

 

With the multiple issues you got there you need to focus on one thing only and it'll generally lead you to fix the whole problem. Say focusing on just the interlock, which generally is controlled from the brake light switch. You'll need to get a wiring diagram and trace that circuit. I do not have access to such diagrams, but I bet others here will.

 

You have a whole bunch of unrelated circuit failures. When you look at the high amp fuses that are common to some of those circuits, they also feed important things like the starter, so if any of those were the problem, it wouldn't start.

 

Sometimes the suspect fuse is good but, not connected good. Simply taking it out, make sure it isn't blown or rusty, pushing it in and out a couple times can fix it. Check your battery posts for oxidation. Make sure the voltage is good, charging voltage is good. Ground connection is good.

 

I did actually test the fuse as well as replace the fuse just to be sure it wasn’t the problem. I tested for voltage at the fuse port and I have a good 12v reading. Leads me to believe that the problem has to be after the fuse in the circuit.

 

In reality all the vehicles signs and symptoms point to the IG1 10A...NOT IG1 No.2...

 

I actually checked both the IG1 and IG No.2 fuses. That’s why I’m lost. I have all the symptoms of the fuses being blown but no blown fuse and replacing the fuses didn’t work.

 

Tried a computer reset or ability to check for any codes?

 

IG1 feeds the turn signal flasher and the park/neutral switch and ACamplifier. An open in that circuit somewhere would certainly explain, no blinkers, no reverse lights, no back up camera, no shift lever indicator light, no ac function but blower works. However, the brake light circuit (Which includes the shift lock) is only fed power from IG1NO2 and the stop fuse. IG1 has nothing to do with the brake lights.

 

I was able to check for codes but I didn’t show any. As far as computer resetting, I did unhook the battery and let it sit for 15 minutes before hooking it back up hoping that would reset it. Unless there is another way?

 

Wait a minute. I just checked the shift lock circuit. There's a shift lock control ECU and guess what. IG1 feeds power to that ECU. All things point to IG1.

 

Does this truck have an aftermarket remote start?

 

Sounds like you covered the bases. Sometimes it can take longer for residual power to drain so you could try overnight or turning lights on to drain all power once disconnected. However it sounds like a bad ground, connection, relay or broken wire somewhere. Looks like some tw members above have some good knowledge on the electrical system.

 

In response to Muddinfun, I have brake lights. I do not have an aftermarket remote start. Do you have a link to the wiring diagram you spoke of that I could take a look at?

I’m very thankful for all the threads and knowledge that TW members have shared and got me to this point, but I didn’t find any that had an issue after the fuse box. I think a wiring diagram might be the next step.

 

Just adding this . Installed new stereo had add a circuit in ign 1 and when put back, put in empty slot between and ign 1and ign 2. Had same symptoms like yours and after a day of checking found a pic on here and realized I installed fuse in wrong slot (dumb ass me ). Also put add a circuit on different fuse when realized was ign fuse . Pic from thread on here . Don't think you as dumb as me but just something to be aware off . Damn I know how you feel . I was lost all because of my dumb ass .
Mines a 2010

 

Not specific to a Tacoma, I’ve seen odd problems like this caused by things like a broken bulb socket shorting, oxidized battery terminals, bad ground connections. Just because you have 12v at the fuse socket doesn’t mean the flow of current is good. A ground cable severely corroded or broken to the point that a single strand of wire is left will still put 12v to a test spot. If you’re able to find a wiring diagram, that should help. Look at connectors, make sure they’re snapped in good. Look for pinched, brittle, broken or burnt wires.

Again, I can’t stress how important it is to look at your battery terminals and post. Posts get oxidized and can cause all kinds of strange symptoms.