Disable ABS and Manual Centre Diff Lock
This is applicable only for Toyota Landcruisers 80 Series with
ABS and Viscous coupled centre Differential.
This idea originally started out as a fix to lock the Centre
Diff in High range but also solved the problem for those that
wanted to turn off the ABS while in High range, particularly on
corrugations where ABS is not at it's best. Another added
advantage I discovered is that you can also operate the factory
fitted Diff Locks in High Range.
As all 80 Series have the one wiring loom it's a relatively
simple procedure and all that you require to purchase is the
standard Toyota "Centre Diff Lock" switch (part number
84725-60040 on the new dashboard and 84725-60010 on the old).
Once you have the switch you will need to remove the lower
portion of the dashboard. To do this remove the ashtray and locate
and remove the screw in the upper centre of the metal plate, and
either side of the ashtray (The one's screwed into plastic, not
the upper two in the metal plate) the other screw to remove is
located under and to the right (Left on LHD models) of the row of
3 switches along the bottom of the dash.
To remove the dash lower the steering column, place one hand at
the ashtray opening and the other on the upright between the
stereo and heater controls and pull gently. This should give you
enough access to get in behind the dash to find the plug required.
The wiring that you are looking for should come from the top of
the dash and be part of the loom linked to the switches already
installed in the top section of the dash. It's generally been
found behind the radio/stereo or the heater controls and has a
terminating block (wrapped in foam, with one green/silver wire
attached to the terminating block).
Now that you have found it (don't blame me ... it is there)
place it through the switch hole in the dash you intend to use,
connect it to the switch you purchased earlier and install the
switch in the dash. All you need to do now is to reinstall the
dash and the job is finished.
To activate the Centre Diff simply press the switch, the ABS
and centre Diff lights should light up on the dash. To disable ABS
you will need to drive in a straight line for at least 200 meters
at a speed over 70 kph with the Diff lock on, then turn off the centre
diff lock and the ABS light will remain on. Presto ... no more
ABS. To reactivate ABS you will need to stop, turn the ignition
off and restart the truck.