Like many others, I recently bought a gen4 (2006 V8 Limited) and after a
little driving around in our first snow and almost getting run over trying to pull out into the street
with traffic coming, Google brought me here to this old but very useful thread.
I read the whole thread and noticed this post a couple pages back
http://www.toyota-4runner.org/engin...vsc-off-atrac-mod-complete-9.html#post2268711
but nobody followed up on it here which is odd because people have been
asking for years how to make this mod work with a relay so that it resets to
off automatically when you turn the ignition off.
Pretty sure the $16 TR7 module referenced in that linked discussion from the above post is the easiest way to do it.
Among its *many* features is a momentary input, latched output mode (Feature #3)
which will reset to off when power is removed.
Here's the manual for the module http://assets.sonicelectronix.com/manuals/pac/tr7_manual.pdf
First enable Feature #3 using instructions on page 3 of the manual.
Supply the TR7 module with +12V switched (Red) and Ground (Black).
Using any momentary switch with a light (including stock VSC or TRAC button)
1. connect switch's ground wire to a chassis ground
2. connect switch's momentary pull down output to the TR7's pull down input (Brown).
3. Connect the TR7's +12V output (Blue) to the momentary switch's light circuit
4. Connect the the TR7's White pull down output to the
tap for the Diff lock light on the 4WD module, or in the blue harness , or wherever else that circuit has been found in this thread.
When the ignition is on and TR7 has power and you press the momentary switch once , it should trigger the TR7's
latching circuit which turns on the light in the switch and also triggers the Diff lock light, fooling the 4WD module into
to disabling VSC and TRAC.
Trigger momentary switch again, TR7 will turn off both +12V and pull down outputs.
Remove power from TR7 (when ignition is turned off) and outputs reset to off.
Will report back when I have it wired up.
[edit]Verified. Only took about a minute to program the TR7 to Feature #3, and half
hour or so to wire up the switch (plus a little time to check, double check everything).
Works as described above. One press triggers the TR7 input, which latches +12V
output to turn the switch light on, plus a pull down which triggers the Diff-lock light same
as any other switch would be used in this thread. Another press to turn it off.
Turning ignition off, resets it to off (remains off when re-started, until
button is pressed again).
little driving around in our first snow and almost getting run over trying to pull out into the street
with traffic coming, Google brought me here to this old but very useful thread.
I read the whole thread and noticed this post a couple pages back
http://www.toyota-4runner.org/engin...vsc-off-atrac-mod-complete-9.html#post2268711
but nobody followed up on it here which is odd because people have been
asking for years how to make this mod work with a relay so that it resets to
off automatically when you turn the ignition off.
Pretty sure the $16 TR7 module referenced in that linked discussion from the above post is the easiest way to do it.
Among its *many* features is a momentary input, latched output mode (Feature #3)
which will reset to off when power is removed.
Here's the manual for the module http://assets.sonicelectronix.com/manuals/pac/tr7_manual.pdf
First enable Feature #3 using instructions on page 3 of the manual.
Supply the TR7 module with +12V switched (Red) and Ground (Black).
Using any momentary switch with a light (including stock VSC or TRAC button)
1. connect switch's ground wire to a chassis ground
2. connect switch's momentary pull down output to the TR7's pull down input (Brown).
3. Connect the TR7's +12V output (Blue) to the momentary switch's light circuit
4. Connect the the TR7's White pull down output to the
tap for the Diff lock light on the 4WD module, or in the blue harness , or wherever else that circuit has been found in this thread.
When the ignition is on and TR7 has power and you press the momentary switch once , it should trigger the TR7's
latching circuit which turns on the light in the switch and also triggers the Diff lock light, fooling the 4WD module into
to disabling VSC and TRAC.
Trigger momentary switch again, TR7 will turn off both +12V and pull down outputs.
Remove power from TR7 (when ignition is turned off) and outputs reset to off.
Will report back when I have it wired up.
[edit]Verified. Only took about a minute to program the TR7 to Feature #3, and half
hour or so to wire up the switch (plus a little time to check, double check everything).
Works as described above. One press triggers the TR7 input, which latches +12V
output to turn the switch light on, plus a pull down which triggers the Diff-lock light same
as any other switch would be used in this thread. Another press to turn it off.
Turning ignition off, resets it to off (remains off when re-started, until
button is pressed again).
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