First you need to refer to the Click Box thread, because your two pieces of wire are going to be used as a McGiver'd replacement for the Click Box. Your attention is specifically drawn to the diagram in post #16 on Page 1 where I tried to explain how the Click Box interacts with the machine electrical system. Forget the Click Box part for now and concentrate on the wiring between the "Caterpillar Monitor System" and the "Monitor Service Connector" (MSC), a 4 pin Deustch connector with male pins in it.....
https://www.heavyequipmentforums.com/threads/the-famous-cat-click-box.72956/
This is what you do: -
1. To access the system in order to clear the Logged ones the Monitor Panel has to be put into Service Mode, so we're trying to duplicate the Click Box procedure of grounding both the Scroll and the Clear contacts of the Monitor System at the same time. This is what the Mode switch does if you look at the wiring diagram.
2. Connect one of the separate ends of the cable to Pin #1 (wire #290) of the MSC, and connect the other one to Pin #2 (wire #291) of the MSC. (The connector pin numbers are stamped on the back of it. I always use the Wire Numbers though, just to be sure.)
3. Turn the key on and let the panel do the self-test. Connect the common end of the wire assembly to Pin #4 (wire #200) of the MSC. The display panel should show
-0- which will then change every couple of seconds to
-1-, -2-, etc
.
4. When the display shows
-3- remove the wire from Pin #4. The
-3- should disappear and the first of the list of Diagnostic Codes should appear. Be aware that every Code is displayed in two steps. The first is the module recording the Code (e.g. 030 or 113), the second is the Code itself (096F03, 248F01, etc.), so even though the display will change to show one after the other on an endless loop it's all really one Code that you are seeing.
5. If the first displayed Code is Logged, you can clear it - go to the next Step. If it is Active you will have to Scroll to the next Code on the list - go to Step 7.
6. Remove the wire from Pin #1 of the MSC, leaving only the wire connected to Pin # 2. Then touch the common end (that you previously removed from Pin #4) briefly back to Pin #4 which will ground the Clear connector of the MSC. The Code should disappear and when it does it should be replaced by the next Code on the list. Continue clearing until a message
END or three dashes
--- appears. This indicates that you have reached the end of the list of Codes in the Monitor.
7. To Scroll to the next Code in the event of coming across a Code that is Active, remove the wire from Pin #2. Connect a single end of your wire assembly to Pin #1. Briefly touch the common end of the wire assembly to Pin #4. The current displayed Code should scroll to the next Code in the list. Be careful, if two consecutive Codes are the same module (e.g. 030) you might think it hasn't scrolled. Give the new Code a couple of seconds to display completely before deciding whether it has scrolled to the next Code or not.
8. To summarize. If you clear a Logged Code the next Code on the list will automatically appear. If the next Code is Active you will need to Scroll the list in order to get to the next Logged Code.
9. There is nothing at all to stop you going through the Code list twice or even a dozen times if the mood takes you.
10. Once you finish clearing Codes the Monitor has to be put back to the Operating Mode again. Repeat Steps 3 and 4 above but obviously forget the first bit because your power is already on. The display will start at
-3- and go upwards through each Mode in turn. I'm not sure how many Modes your particular Monitor has, it may be as many as 10, but no problem. Keep at it until it shows
-0- again remove the wire from Pin #4 and you're done. The display should then return to the normal Operating Mode that you had before you started. Remove your wire assembly and put it somewhere safe. You are going to need it again once you've done some electrical repairs.
