DTC U0029: F-CAN Communication Line Error (BUS OFF)
NOTE:
- Make sure the HDS communicates with the ECM/PCM and other vehicle systems. If it does not, go to DLC Circuit Troubleshooting (see DLC CIRCUIT TROUBLESHOOTING ).
- If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
- Clear the DTCs with the HDS.
- Turn the ignition switch to LOCK (0) and then back to ON (II), or press the engine start/stop button to select the OFF mode and then the ON mode.
- Wait for at least 6 seconds.
- Check for DTCs with the HDS.
Is DTC U0029 indicated?
YES -Go to step 5.
NO -Intermittent failure, the system is OK at this time. Check for loose or poor connections, or worn/shorted wires. If the connections are good, check the battery condition (see BATTERY TEST ) and the charging system.
- Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
- Disconnect the appropriate connector at each control unit in the table one at a time. Clear the DTC, then recheck for DTCs after each unit is disconnected.
Control Unit Connector Gauge control module 32P connector ECM/PCM Connector A (49P) VSA modulator-control unit 47P connector SRS unit Connector A (39P) Audio-navigation unit(1) Connector H (28P) TPMS control unit 20P connector EPS control unit 28P connector Yaw rate-lateral acceleration sensor(2) 4P connector Yaw rate-lateral longitudinal/acceleration sensor(3) Steering angle sensor 5P connector SH-AWD control unit Connector A (20P) AcuraLink control unit(4) Connector A (32P) (1) With navigation (2) Without SH-AWD (3) With SH-AWD (4) USA models with navigation Is DTC U0029 indicated after each individual unit was disconnected?
YES -Go to step 7.
NO -Replace the control unit that was disconnected when DTC U0029 did not set.
- Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
- Disconnect all the control units connectors in the following table.
Control Unit Connector Gauge control module 32P connector ECM/PCM Connector A (49P) VSA modulator-control unit 47P connector SRS unit Connector A (39P) Audio-navigation unit(1) Connector H (28P) TPMS control unit 20P connector EPS control unit 28P connector Yaw rate-lateral acceleration sensor(2) 4P connector Yaw rate-lateral longitudinal/acceleration sensor(3) Steering angle sensor(3) 5P connector SH-AWD control unit(3) Connector A (20P) AcuraLink control unit(4) Connector A (32P) (1) With navigation (2) Without SH-AWD (3) With SH-AWD (4) USA models with navigation - Disconnect the HDS from the data link connector (DLC).
- Check for continuity between body ground and gauge control module 32P connector terminals No. 13 and No. 14 individually.Fig 1: Checking Continuity Between Body Ground And Gauge Control Module 32P Connector Terminals No. 13 And No. 14
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair a short to ground in the wire.
NO -Go to step 11.
- Check for continuity between gauge control module 32P connector terminals No. 13 and No. 14.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair a short in the F-CAN wires.
NO -Replace the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ).