DTC B1831: Right Mirror Vertical Sensor Malfunction Acura TL III facelift

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 ).

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1. Clear the DTC with the HDS.
2. Turn the ignition switch OFF, and then back ON (II).
3. Operate the right power mirror tilts up or down with the power mirror switch.
4. Check for DTCs with the HDS. Is DTC B1831 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time.
5. Turn the ignition switch OFF.
6. Remove the driver's dashboard lower cover (see «DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION»(ref-291501-S24802519012008072900000) ).
7. Remove the driver's and front passenger's door panels (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(ref-291563-S03686430832008072900000) ).
8. Disconnect the power mirror control unit 26P connector.
9. Disconnect the left and right power mirror 13P connectors.
10. Check for continuity between the right power mirror connector (13P) No. 9 terminal and body ground. Is there continuity? YES -Repair a short in the RED/WHT wire. NO -Go to step 11.
11. Connect the power mirror control unit connector (26P) No. 8 terminal to body ground with a jumper wire.
12. Check for continuity between the right power mirror connector (13P) No. 9 terminal and body ground. Is there continuity? YES -Go to step 13. NO -Repair an open in the RED/WHT wire.
13. Check for continuity between the right power mirror connector (13P) No. 8 terminal and body ground. Is there continuity? YES -Repair a short in the LT BLU wire. NO -Go to step 14.
14. Connect the power mirror control unit connector (26P) No. 17 terminal to body ground with a jumper wire.
15. Check for continuity between the right power mirror connector (13P) No. 8 terminal and body ground. Is there continuity? YES -Go to step 16. NO -Repair an open in the LT BLU wire.
16. Check for continuity between the power mirror control unit connector (26P) No. 7 terminal and body ground. Is there continuity? YES -Repair a short in the LT GRN/RED wire. NO -Go to step 17.
17. Connect the power mirror control unit connector (26P) No. 7 terminal to body ground with a jumper wire.
18. Check for continuity between the right power mirror connector (13P) No. 6 terminal and body ground. Is there continuity? YES -Go to step 19. NO -Repair an open in the LT GRN/RED wire.
19. Reconnect the power mirror control unit connector (26P).
20. Turn the ignition switch ON (II).
21. Measure the voltage between the power mirror control unit connector (26P) No. 8 and No. 7 terminals. Is there about 5 V? YES -Faulty right power mirror position sensor; replace the power mirror actuator (see «POWER MIRROR ACTUATOR REPLACEMENT»(ref-291595-S34131286482008072900000) ). NO -Substitute a known-good power mirror control unit, and recheck. If DTC is gone, the original power mirror control unit is faulty; replace it.