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DTC B1843: UART Communication Error Honda Crosstour I

Memory Modules 4 illustrations ~343 words

Note. 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 ).

Scheme 69

Scheme 69: DTC B1843: UART Communication Error
Scheme 69: DTC B1843: UART Communication Error

Scheme 70

Scheme 70
Scheme 70

Scheme 71

Scheme 71
Scheme 71

Scheme 72

Scheme 72
Scheme 72
  1. Clear the DTC with the HDS.
  2. Turn the ignition switch to LOCK (0), and then back to ON (II).
  3. Operate the power seat with the driving position memory switch.
  4. Check for DTCs with the HDS. Is DTC B1843 indicated? YES -Go to next step. NO -Intermittent failure, the system is OK at this time. Check for loose or poor connections.
  5. Turn the ignition switch to LOCK (0).
  6. Disconnect the power seat control unit connectors and power mirror control unit connector (24P).
  7. Check for continuity between power seat control unit connector B (40P) terminal No. 23 and power mirror control unit (24P) connector terminal No. 24. Is there continuity? YES -Go to next step. NO -Repair an open in the UART wire between the power mirror control unit connector (24P) and power seat control unit connector B (40P).
  8. Check for continuity between body ground and power seat control unit connector B (40P) terminal No. 23. Is there continuity? YES -Repair a short to ground in the UART wire. NO -Go to next step.
  9. Reconnect the power mirror control unit (24P) connector.
  10. Measure the voltage between body ground and power mirror control unit connector (24P) terminal No. 13. Is there battery voltage? YES -Go to next step. NO -Check No. A15 (10 A) fuse in the under-hood fuse/relay box. If the fuse is OK, repair an open or high resistance in the wire.
  11. Turn the ignition switch to ON (II).
  12. Measure the voltage between body ground and power mirror control unit connector (24P) terminal No. 15. Is there 0.2 V or more? YES -Replace the power mirror control unit (see «POWER MIRROR CONTROL UNIT INPUT TEST/REPLACEMENT»(ref-360134-S34854680882010042600000) ). NO -Repair an open or high resistance in the wire between the power mirror control unit and G401. If the wire is OK, repair G401.

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