Bendix Commercial Vehicle Systems VORAD VS-400 INSTALLATION NOTES - Manual (Page 21)

General Information
19
Pretest Procedures
Step Procedure
K 1. Vehicle Ignition: Key-ON, Engine-OFF.
2 . Measure for J1939 data voltage on pins 5 and 9 of the FLR harness connector .
(J1939 Low to Ground)
a . If the voltage is fluctuating between 0 to 3 volts .
i .
Proceed to Step L .
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 .