I recently bought a Star C3 multiplexer, laptop, and all cables from AliExpress. It is known that some sellers will ship cables without all the wires, some multiplexers will have bad solder joints internally, and various other problems. Here is my experience fixing a cable with too few wires.
My kit had ten too few wires in the 38 pin to multiplexer cable: testing with a multimeter, I found nothing was connected to the pins for the diagnostic module (pin 19) or the EGAS module (pin 7). I went on ebay, and bought another cable ($50...) that appeared to have more sockets on the multiplexer end of the cable.
Unfortunately, that ebay cable had the complete set of pin sockets on the multiplexer end, but no wires run to these new pin sockets. With a screwdriver and some wrenches I opened both cable ends of both cables I now had, and I borrowed wires from one cable and added them to the other, run outside the sheath, to make one complete cable.
On the 38-pin end, the wires have round crimp connectors that slide onto the backs of the 38 pins. On the multiplexer end, each wire is soldered to a cylindrical socket for the pins on the multiplexer. I salvaged parts from my other cable after tediously stripping away the wire sheathing. If you wish to repair a cable and don't have a second, the pins on the 38-pin (car) end are 0.0625in/1.5mm diameter and the multiplexer end seems to be the same. You might be able to find useful pin-sockets on mouser electronics.
Should anyone need this information, the wiring scheme of the 38-pin to multiplexer cable is as follows (Car end - Multiplexer end)
1-A
2-B
3-C
4-D
5-E
6-F
7-G
8-H
9-J
10-K
11-L
12-M
13-N
14-P
15-R
16-S
17-T
18-U
19-V
20-W
21-X
22-Y
23-Z
24-a
25-b
26-c
27-d
28-e
29-f
30-g
31-h
32-i
33-j
34-k
35-m
36-n
37-p
38-q
My kit had ten too few wires in the 38 pin to multiplexer cable: testing with a multimeter, I found nothing was connected to the pins for the diagnostic module (pin 19) or the EGAS module (pin 7). I went on ebay, and bought another cable ($50...) that appeared to have more sockets on the multiplexer end of the cable.
Unfortunately, that ebay cable had the complete set of pin sockets on the multiplexer end, but no wires run to these new pin sockets. With a screwdriver and some wrenches I opened both cable ends of both cables I now had, and I borrowed wires from one cable and added them to the other, run outside the sheath, to make one complete cable.
On the 38-pin end, the wires have round crimp connectors that slide onto the backs of the 38 pins. On the multiplexer end, each wire is soldered to a cylindrical socket for the pins on the multiplexer. I salvaged parts from my other cable after tediously stripping away the wire sheathing. If you wish to repair a cable and don't have a second, the pins on the 38-pin (car) end are 0.0625in/1.5mm diameter and the multiplexer end seems to be the same. You might be able to find useful pin-sockets on mouser electronics.
Should anyone need this information, the wiring scheme of the 38-pin to multiplexer cable is as follows (Car end - Multiplexer end)
1-A
2-B
3-C
4-D
5-E
6-F
7-G
8-H
9-J
10-K
11-L
12-M
13-N
14-P
15-R
16-S
17-T
18-U
19-V
20-W
21-X
22-Y
23-Z
24-a
25-b
26-c
27-d
28-e
29-f
30-g
31-h
32-i
33-j
34-k
35-m
36-n
37-p
38-q
