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Appendix A – Pin Assignment for the OBD II Cable
VSI-2534 OBD II Cable Pin Assignment
J1962
Connector
VSI-2534 Purpose/Function
VSI-2534
DB 25
1
Single Wire CAN
1
2
SAE J1850 (+)
2
3
(not connected)
4
Chassis Ground
4
5
Signal Ground
5
6
ISO 15765-4 / CAN High
SCI_A_ENGINE (Rx)
Programming Voltage
6 & 24 *
7
ISO 9141 / ISO 14230 K-line
SCI_A_ENGINE (Tx)
SCI_A_TRANS (Tx)
SCI_B_ENGINE (Tx)
7
8
(not connected)
9
GMUART
SCI_B_TRANS (Rx)
Programming Voltage
9 & 20 *
10
SAE J1850 (-)
10
11
Programming Voltage
11
12
SCI_B_ENGINE (Rx)
Programming Voltage
12
13
Programming Voltage
13
14
ISO 15765-4 / CAN Low
Programming Voltage
SCI_A_TRANS (Rx)
14 & 25 *
15
ISO 9141 / ISO 14230 L-line
Short to Ground
SCI_B_TRANS (Tx)
15
16
Unswitched Battery Voltage
16
Not Used
3, 8, 17 -19, 21 - 23
* NOTE:
These pairs of pins are either connected together in the VSI-2534 tool or
connected in the OBD II cable.
Pins 6 and 24 are connected together within the VSI-2534 tool.
Pins 9 and 20 are connected together within the OBD II cable.
Pins 14 and 25 are connected together within the VSI-2534 tool.