Bendix Commercial Vehicle Systems VORAD VS-400 INSTALLATION NOTES - Manual (Page 20)

General Information
18
Pretest Procedures
Step Procedure
J 1. Vehicle Ignition: Key-ON, Engine-OFF.
2 . Measure for J1939 data voltage on pins 4 and 9 of the FLR harness connector .
(J1939 High to Ground)
a . If the voltage is fluctuating between 2 to 5 volts .
i.
Proceed to Step K.
b . If the voltage is a constant 0 volts .
i. Test Failed. Check for open / loose connections in the vehicle’s J1939 data link harness.
(See Note)
Note: Refer to vehicle OEM repair manual or contact the OEM for more information on the J1939 data link harness .
Pin # Description
J1