Jim Grant's Tech Tips
Isuzu Trooper, Back-Up Light Switch
Could you tell me where the switch is for back-up lights
on a ’99 Isuzu Trooper? Both lights went out at the
same time. Could this be the switch, as I don't think both
bulbs would go out at the same time?
assume, check those bulbs before you go after the switch.
As for the Back-up light switch it is call an Automatic
Transmission Mode Switch and as you can guess by its name
it does a lot more than turn on the back-up lights. You’ll
find this switch mounted on the front driver’s side
of the transmission by the larger of the 2 transmission
oil pans. It will have 2 connectors with 9 wires total.
This switch is pretty close to the exhaust so check for
heat damaged wires before you go throwing a switch at it.
Also it is critical that the switch be positioned correctly.
It has important information for the computer and you don’t
want the computer not knowing which gear you’ve truly