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If you cannot read codes then there is no reason to go any farther until you can, if the TCM will not recognize being put into diag mode it will not operate the transmission. BTW there are many codes that do not illuminate the trans light, if you do not read them you have really no idea if you...

If your M1097R1 has a three speed (no park position) then you do not have a TCM, the three speed is all mechanical

All the wiring diagrams are in that troubleshooting guide, there is 12V continuous to one pin and switched 12V to a different pin on the TCM If you have not already done so open the box and make sure there was no water intrusion into the box.

OK then it is time to get out the meter and make sure the two sources of power and the grounds are good, if that all checks out and you are positive you are doing the jumper correctly then the TCM is likely bad, you should also inspect and re seat the connectors on the inside and outside of the...

Read the troubleshooting guide

You take the code and look up what it means on the very next page of the troubleshooting guide, page 61 and then that page tells you what page to go to to troubleshoot that code. They do not make a code reader for this application as it just is not necessary.

It is still a good idea to wait 90 seconds ANY time the run switch is turned off before turning it back on again, unplugging the glow plug controller is supposed to protect the glow plugs but I would not trust it. That goes for the entire time you own the HMMWV, ALWAYS wait 90 seconds after...

Start on page 60

You do not need a code reader, the instructions are in the trouble shooting guide I posted above.

If you have not read the codes how is it you think you need a TISS or a relay???? One BIG mistake many folks make is just start willy nilly replacing parts, this can and OFTEN leads to multiple issues, troubleshoot the problem and fix it right. EDIT, there are at least two dozen different things...