Rear Hatch Lock Actuator Problem (1 Viewer)

[Alaska Ranger]

First: This most definitely is a First World Problem, in that the '88 62 I have just bought is so close to dealer-showroom perfection that I have to search really hard to find little problems.

I have been able to amass a very small number of them, though, and here's one:

The driver's door power lock does lock every door, including the rear hatch...but it unlocks only all the other doors. Rear hatch remains locked. A dissection of the hatch reveals that the wiring harness registers a nice blip of electricity when I hit "Lock", but nothing when I try "Unlock".

How - and more importantly: where - can there exist such a wiring gremlin? A diligent search through Mud failed to turn up a similar problem.

 

[sved]

There are 2 relay's in the left rear panel near the rear window waterbag.One is for lock and one is to unlock the rear hatch.Press the centrallock switch lock/unlock and you will know which one is not activated.Search from there.

 

[SteveH]

In spite of the few miles on your truck, I would perhaps remove, clean, and lube the lock mechanism. My FJ62 was getting power, but the hatch would not lock or unlock. A total clean/lube completely fixed it. I had to gut my hatch to repaint it, so it made sense to do this at that time.

 

[Alaska Ranger]

I tested the relays - they are strange ones - and although both contact properly, I've no continuity between the two legs one one of them where there is continuity on the other. That is never a good sign....but given these things go for unobtanium prices, I fear I have to endure the horrors and tribulations of manually unlocking the gate for the next aeon or so.

If I understand correctly, these are the same as the Circuit Opening relays on Toyota's EFI fuel pumps. They are not like the 30-86-86-87 Bosch style relays, but seem to have something akin to a logic "If A Then B / If Not A Then C" set up. But I may not have glommed this correctly.

 

[Kaasdief]

I would view the hatch remaining locked as feature. Some places were we travel local people have been know to loot stuff out of the back vehicles.

 

[sved]

You can use this bosch relay to solve the problem.

connect 87 to door fuse +12V and 87a to ground
30 is connected to the hatch solenoid
86 +12v
85 ground