Hey DAVE 1972,
I do not have the specific information for your vehicle as it was not sold in North America.
The Isuzu Rodeo was sold in the US and should have the same system.
From what I can see you will have an electric actuator motor on the front axle and the transfer case.
If you can upload pictures of the actuators for the front axle and transfer case actuators we should be able to identify the system.
There will be switches in both to tell the system the actuator has shifted to the end stop.
The light will not stay solid if either the motor doesn't move, it doesn't go all the way or there is an issue with the switch contacts registering the movement.
You can try with ignition on, engine not running, get someone to switch the 4x4 on at check to see if you are getting movement from both actuators.
The front axle actuator should be on the left of the front axle, you should hear it click if its moving, same with the motor on the transfer case.
Hope that helps.
Regards, Joe
Monday, April 1st, 2019 AT 3:58 PM