How to do self test RS232 cable by GM Tech2 scanner

If you need to run TIS2000 software on PC, you have to connect GM Tech2 scanner using the RS232 cable with the DB9 Adapter to a serial COM Port at the PC. If you cannot get the Tech 2 scan tool connect to PC or fail to communication well, the best way is to connect the RS232-DB9 adapter correctly and then run a RS232 self test.

GM TECH 2 Features:

1) GM software in the Tech 2 Flash means the most comprehensive diagnostic software available for late model GM vehicles.
2) Support for on-board diagnostics on all GM systems 1992 thru current year.
3) Removable hardware modules provide insurance against scan tool obsolescence.
4) Large, easy-to-read backlit screen.
5) RS232 & RS485 ports provide the avenue to connect future devices to your Tech 2 Flash.
6) Ability to capture stored DTCs, Freeze Frame, and Failure Record for later review.
7) Ability to view the status of vehicle diagnostic tests as they run.
8) Bi-directional The authentic GM 1992-current year software will provide full bi-directional control when performing power train, chassis, and body diagnostics.

GM Tech2 gm diagnostic scanner comes with several connectors, including a RS232 cable and RS232-DB9 adapter (mark red circle below)
Tech2 RS232 Adapter
1) Follow the cable pinout to connect the cable correctly
Tech2 DB9-JR45 RS232 cable adapter pinout
Pinout RJ45 to DB9 cable
Tech2 RS232 Adapter

BD-9 to RJ45
1——-2
2——-4
3——–5
4——–8
5——–7
6——–1
7——–3
8——–6
9——–not connected

2) Then do a RS232 cable self test

How to do Tech 2 RS232 self test?

1. Power up the Tech2. Connect RS232 cable with Tech II scanner main unit.
Tech II scanner main unit
2. Come to main menu. Select F4:Tool Options
GM Tech2 scanner RS232 cable self test
3. Select F3: Self Test
GM Tech2 scanner RS232 cable self test
4. Follow the system prompts:
Before running the Tech 2 self test:
CANdi interface must not be connected
ALDL loopback should be connected
Failure to follow these instructions may invalidate the self test
Press EXIT to continue
GM Tech2 scanner RS232 cable self test
5. Select F3: Selectable main PCB
GM Tech2 scanner RS232 cable self test
6. Select F2:RS232 LoopBack
GM Tech2 scanner RS232 cable self test
7. Tech2 RS232 cable self test has passed
GM Tech2 scanner RS232 cable self test
If RS232 cable passes self test, the commutation between Tech2 scanner and PC is well built.

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