Receiving “abs module “ code in mileage box area. After reading HeavyD’s previous posts, I pulled harness from radar and DIU to test. DIU had 0 voltage on J1939 to ground. Radar side of harness voltage was 0.3 for power supply and no voltage reading j1939 high side. Did some research and it’s recommended to replace entire harness. HeavyD, can old harness stay on truck (disconnected) and run the new harness along side of it? Also is there a wiring diagram for this harness available?