Only driver door will unlock, help

[grinchy]

Would you happen to have similar codes from your techstream?

5/14/24 b1206 b2281 b2321

P/w master sw ecu communication stop

P signal

D-door motor ecu communication stop

My tech steam laptop is a 2008 netbook and pretty non functional. I need to get the wireless dongle and an image that will run on my MacBook Air. That’s the long way of answering that I haven’t looked for codes for the window issue.

I’m not suffering from central lock issues.

 

[highfructose]

This may be a complete 145 page wiring diagram for an lx570. It may be possible to trace electrical issues with it.

Door lock wiring diagram appears to be 71, 72, and 73

http://myfirewood.com/LEXUS/LX/rm2452e/PDFs/ElectricalWiringDiagram-Overall.pdf

 

[highfructose]

It’s looking like I’ve now lost the following functions:
-Pass, rear pass, rear driv door power unlocking (power locks all still work, driver side power lock works…this used to be intermittent only in the morning)
-turn signal “blink” upon locking of all doors
-intermittent automatic rear lift gate function (open and close)
-automatic headlight activation (in dark/rain)

 

[highfructose]

Update:
I downloaded a wiring diagram (linked above) and legend (attached)

While “searching” for access to the main body ecu, I guessed maybe it’s what the main bundle of wires from the engine bay into the cab plugs into (based on its location and the bundle’s location).

I inspected the grommet between the cab and the engine bay for moisture-none.

However, I have two separate sets of wires (arb compressor switch and aux light switch) that both penetrate (small hole) that grommet…and fit in between the grommet and the hole…that’s how I routed them into the vehicle.

So I tried manipulating those wires…spinning the grommet slightly, moving the extra wires to the top, etc.

And now my door (power)unlocking appears to work again.

Though I appear to have lost the “automatic” headlight activation…so the vehicle doesn’t turn the headlights on at night or when the wipers turn on anymore.

 

[bloc]

Update:
I downloaded a wiring diagram (linked above) and legend (attached)

While “searching” for access to the main body ecu, I guessed maybe it’s what the main bundle of wires from the engine bay into the cab plugs into (based on its location and the bundle’s location).

I inspected the grommet between the cab and the engine bay for moisture-none.

However, I have two separate sets of wires (arb compressor switch and aux light switch) that both penetrate (small hole) that grommet…and fit in between the grommet and the hole…that’s how I routed them into the vehicle.

So I tried manipulating those wires…spinning the grommet slightly, moving the extra wires to the top, etc.

And now my door (power)unlocking appears to work again.

Though I appear to have lost the “automatic” headlight activation…so the vehicle doesn’t turn the headlights on at night or when the wipers turn on anymore.
View attachment 3662080

Is it possible you damaged the wire harness while running those accessories through the grommet?

 

[highfructose]

Is it possible you damaged the wire harness while running those accessories through the grommet?

I don’t think I damaged it, persay…at this point I think I may have had some electrical interference or pressure on the wires that run to the main body ecu being touched by my aux or compressor wires…

I don’t know though…it’s odd that I’ve reacquured locks even after torrential downpours..even in the morning following the jostling of those wires…odd that I also have now lost automatic headlights.

Might just be jostling the harness that (I think) leads to the main body ecu “fixed” it

 

[bloc]

I don’t think I damaged it, persay…at this point I think I may have had some electrical interference or pressure on the wires that run to the main body ecu being touched by my aux or compressor wires…

I don’t know though…it’s odd that I’ve reacquured locks even after torrential downpours..even in the morning following the jostling of those wires…odd that I also have now lost automatic headlights.

Might just be jostling the harness that (I think) leads to the main body ecu “fixed” it

Thing is, jostling wires shouldn't do anything to the function of the harness unless those wires are damaged.

 

[highfructose]

Thing is, jostling wires shouldn't do anything to the function of the harness unless those wires are damaged.

You could be right

I’d really like to be able to get that main body ecu out to inspect it, it’s harness, and the wires around it.

Since the door locks now work, I haven’t had the incentive to continue with tearing into the dash to get to it…other chores and projects are in front of it so long as the doors are functioning

They might stop working tomorrow though, who knows…then:

next step is for me to print out the wiring diagrams, re-learn how to read them (it’s been 15 years or so since I had to read wiring diagrams for a repair) and start working my way back from the “unlock” circuit in the passenger doors to wherever it originates.

If it all flows from that ecu (as opposed to from ecu to relay to door locks), then I’ll likely purchase a used ecu (not spending $900 on a new one unless I have to), install it in the truck, and then send my old ecu to be repaired and kept as a spare.

While in there I can also look closely at the wires to see if there’s damage.