My trunk or upper rear door will not open with the latch. I have to manually pull the yellow emergency cord. Toyota told me the lock mechanism has to be changed so I bought and replaced the whole lock assembly and still have not solved the problem. What else can it be.
Rear Trunk door wont open.
- Thread starter jcmiro
- Start date
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Markuson
SILVER Star
You have a yellow emergency cord? Where is that?? I've been trying to figure out how to install a means of escape from the back if sleeping back there...but it's all electric. No handle...no cord. ??
Markuson
SILVER Star
Hmmm, no chord here that I recall either. I've got a non-US interior switch to allow interior opening. Crazy they don't have some OE function to open from the inside.
Markuson
SILVER Star
I'm very curious about your solution.
What I really want, though, is a manual switch. What if your batteries are totally dead? Can't even open the back hatch with a key! That's just nuts in my opinion. Should always be a manual release to get OUT...and really wish I could manually open with a key from the back. I keep tools and essentials in drawers back there, and if it's totally dependent upon battery power due to a lack of string, lever, etc., that's just bad.
Can you post what you've got back there with a button? That's a lot better than nuuuthin...
I'll search around, there is a thread with info and part numbers
the momentary pushbutton switch that sends a signal to the ecu which in turn poles for your fob and then opens and unlocks the door is quite probably faulty. dust and water can get in producing a bad earth in this switch. unplug it and test the poles (bridge 1&3 i think) in the female part of the plug to check lock mechanism function. there are threads on this common fault on this board too. this issue is distinct from the fault that can and does occur in the electrolock mechanism. i have had both at different times. inspect the outside rubber on the switch. look for a crack. bet ya $2.
Markuson
SILVER Star
Thanks Kurt.
I do still wonder if there's a way to make a manual release...but this is something I may try to do... Wish I wasn't so electrically "special..."
- Thread starter
- #13
So if I remove the push botton switch and jump the middle and right wire the lockmechanism should activate. Is this correct?
yep you got it. In fact it may be be poles 1 and 2 or poles 1 and 3 (I just cant remember for sure) but very easy to resolve. One combo will open, the other will lock. All the swich is doing is completing a circuit that sends a signal to the ecu. The ECU then polls for your key fob. If it detects the fob it will send a signal to the lock mech to open. Same as all other doors. I'll see if I can find a link for you here.
Looks like its Poles 1 and 2. see diagram below. Hope this displays as intended.
1. INSPECT BACK DOOR LOCK ASSEMBLY
If its the switch that's faulty then here is the part number:
BACK DOOR OPENER SWITCH ASSY: 84840 28040
Costs bugger all. $30 I recall from Amayama.com. Turns up in post in a couple of days.
1. INSPECT BACK DOOR LOCK ASSEMBLY
Set the back door lock to the full-latch position.
- Apply battery voltage to the door motor terminals and check the operation of the door lock motor.
OK:
Measurement Condition Specified Condition
Battery positive (+) → pole 2 (ACT+)
Battery negative (-) → pole 1 (ACT-)
Moves to open-latch position
- If the result is not as specified, replace the back door lock assembly.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection Condition Specified Condition
1 (ACT-) - 3 (+) Open-latch Below 1 Ω
1 (ACT-) - 3 (+) Full-latch 10 kΩ or higher
- If the result is not as specified, replace the back door lock assembly.
If its the switch that's faulty then here is the part number:
BACK DOOR OPENER SWITCH ASSY: 84840 28040
Costs bugger all. $30 I recall from Amayama.com. Turns up in post in a couple of days.
Markuson
SILVER Star
Looks like its Poles 1 and 2. see diagram below. Hope this displays as intended.
1. INSPECT BACK DOOR LOCK ASSEMBLY
Set the back door lock to the full-latch position.
- Apply battery voltage to the door motor terminals and check the operation of the door lock motor.
OK:
Measurement Condition Specified Condition
Battery positive (+) → pole 2 (ACT+)
Battery negative (-) → pole 1 (ACT-)
Moves to open-latch position
- If the result is not as specified, replace the back door lock assembly.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection Condition Specified Condition
1 (ACT-) - 3 (+) Open-latch Below 1 Ω
1 (ACT-) - 3 (+) Full-latch 10 kΩ or higher
- If the result is not as specified, replace the back door lock assembly.
If its the switch that's faulty then here is the part number:
BACK DOOR OPENER SWITCH ASSY: 84840 28040
Costs bugger all. $30 I recall from Amayama.com. Turns up in post in a couple of days.
No idea when at that means up there...
Envious...- Thread starter
- #17
Cool. Im good until the "standard resistance" part. Im actually very interested in all this stuff. Where are you getting this info. Id love to have a LC manual for all my problems. I usually just to moranbahweather. Yours seems better.
nope that was all from Moranbah. There is generally more there than might first appear. Check following tabs:
Vehicle Interior
Door Lock
Back Door lock
Inspection
Or simply go here: GSIC - Global Service Information Center
You can check the relevant electrical diagrams if you are so inclined by following "Electrical Systems" tab at top.
Then: Vehicle Exterior (dont know why its different this time than above)
Then: "Back Door opener", then follow your nose.
The part circuit you are interested in is S7 and you will zero in on it if you expand the main body ECU circuit displayed on RHS and then scroll across to S7 (back door opener). Took me a while but eventually it starts to make sense.
Good luck
Vehicle Interior
Door Lock
Back Door lock
Inspection
Or simply go here: GSIC - Global Service Information Center
You can check the relevant electrical diagrams if you are so inclined by following "Electrical Systems" tab at top.
Then: Vehicle Exterior (dont know why its different this time than above)
Then: "Back Door opener", then follow your nose.
The part circuit you are interested in is S7 and you will zero in on it if you expand the main body ECU circuit displayed on RHS and then scroll across to S7 (back door opener). Took me a while but eventually it starts to make sense.
Good luck
