2006 Toyota tacoma (Base) Dome (door mode) issue

Good day,

1) Issue:
My dome light does not come on when in "door" mode.

2) Trouble shooting results:

• Works in "on" mode.
• When door switches are pressed the "open door" icon shows up on dash (both sides) thus switches are ok.
• fuse works

3) Assumption: dome light assembly is the issue (contacts?)

4) Have removed dome light assembly to inspect contacts.
* Contacts are not accessible as it is a closed system with no screws etc to separate slider from assembly. I am unable to inspect contacts on "slider" without breaking the unit.


Any suggestions would be welcomed, either to open it or to track down a replacement.
I have had a hard time finding the part, well anywhere.


Thank you in advance.

 

Have you checked it at the connector with a multimeter? This would ensure it's not a wiring issue.

 

if it works with the on and off position, I would also look at the door switch

 

@haydendoesmith , I'll borrow a multi-meter and check the voltage. I am not much in the way of an electrician so I'll do some homework on what I should expect to see - voltage wise. Thank you!
@Geeves77, unless my logic is flawed I believe the door switches are ok as they produce an "open door" icon on the dash when pressed. Thank you!

 

I'll have to pull the diagrams later but if I recall correctly you have 3 wires at the dome light, one is constant power from the DOME fuse, one is constant ground, and the other one is grounded by the Body ECU when the door is open.
Since you have a door ajar light that suggests the door switch is good and the Body ECU is seeing the door switch signal.

 

Update:

1. I've tested the plug with voltmeter and seeing +/- 12 Volts .
2. I popped slider off without damaging it too much and gave contacts a light sand.
3. Plugged it in and no change. Meaning "Door ajar" light on but no light in dome.

Is it the dome light assembly?
I've seen a few for early Tacomas however I haven't found one that matches.
Any suggestions where to find one?

Thank you @Dm93 , @Geeves77 and @haydendoesmith

I think this is the part I'm after:
https://www.toyotapartsdeal.com/oem...bmodel=&extra1=&extra2=&filter=()&location=pd:,

If the consensus is dome assembly I'll order it. I appreciate your help folks!

 

Did you check that the Body ECU was grounding the Blue wire (Pin 3)?

 

@Dm93, Sir My knowledge of "how to test" is limited.
I have a multimeter and circuit tester (single probe with alligator clip)...
1) I grounded the circuit tester and probed the white wire (On) at the dome connector and got light on my tester.
2) tested blue wire with door open and nothing

How do I test the blue for ground?
Do I need to open up the Body ECU to test?
Is there a way to ground blue wire with an overlay ground to do a quick test?

My apologizes for my lack of knowledge so I appreciate the help!
Thank you
Kevin

 

Put your meter accross the white and blue wires, with the door open you should see battery voltage.

 

1) white wire and white/black taper wire: battery voltage
2) white wire and blue wire: NO battery voltage

 

So you either have a broken wire between the Body ECU and Dome Light or a failed Body ECU.
You need to go to connector 1E Pin 9 (Blue) on the interior fuse/junction box and check between it and a power (Pin 16 of the DLC would be a convenient power).

 

To clarify - I am putting a probe on the OBD, pin 16 (white plug under drivers dash) and unplugging 1E and test pin 9 (on fuse box/JB vs the unplugged connector coming from roof circuit) and expecting/hoping for power?

 

No 1E needs to be plugged in when testing, use a needle or T-Pin to backprobe it.

 

Roger that.

 

Update:
Seeing power on MM at blue wire (backside tested) and 16.

 

So it seems that wire is broken somewhere between connector 1E and the Dome Light.
I believe that harness goes up the A-Pillar, might be worth a shot to pop that cover off and have a look there.

 

Thank you.

I am expecting a couple bundles of wrapped wire when I expose A-pillar.
My assumption is that the wires from dome to 1E are uninterupted (?)

To your knowledge are there any connections in there that could short ?
I am going to open up A-pillar shortly.


Appreciate it...
"Give a man a fish or Learn him how to put a worm on eh"

 

According to the diagram there are no connectors between 1E and the Dome Light.

 

Ok. Given that the wires from dome switch to 1E are (expected to be) uninterrupted, I'll open A-pillar and look for splicing etc, otherwise I'll look at blue wire connection at dome plug and blue wire connection that plugs into 1E.

 

• Tested 1E connected to fuse/JB @ 9 pin (backside) and 16 and see 12.7 V.
• Opened A-pillar nothing exposed to test
• Test blue wire at dome (front and back) and nothing.
• If the problem is somewhere in between I'd be surprised as it has no connection points but at this point I accept defeat.

Thanks all for the help.