The indicator light on this vehicle is controlled by the actuator/ECU. So, this means we are either having an ECU issue or the ECU is never receiving the input from the button request which means we have a wiring or button issue.
The fact that the light is not working and the 4WD is not engaging confirms this is the side of the system that we are having an issue with. If the light was the only thing not working, then we could deal with just that, but the system is not engaging which means the ECU or the button/wiring is the issue.
The way to test this is to use a scan tool and monitor the button input at the ECU to find out if the ECU is seeing the button being pressed. However, we can also check for voltage at the ECU.
Basically, when you press the buttons on the steering wheel, the 12-volt signal is run through a resistor set that will change the voltage. This voltage will go to the ECU which tells the ECU which button is being pressed.
So, I would start with pressing the cruise button which appears to be close to 12 volts as it is not run through any resistors. If you are not getting this voltage at the ECU then the button is the issue. If you are and the light is not coming on to activate the system, then you have an ECU issue.
Let me know what questions you have with this and we can go from there.
Images (Click to enlarge)
Sunday, May 8th, 2022 AT 6:17 AM