DTC B2188: Communication Line (UART Line) Circuit Open
- Clear the DTCs with the HDS.
- Turn the ignition switch to LOCK (0) and then back to ON (II).
- Open and close the each window by operating the front passenger's, left rear, and right rear power window switches.
- Check for DTCs with the HDS.
Is DTC B2188 indicated, and does the any window fail to open or close?
YES -Go to step 5.
NO -Intermittent failure, the UART line is OK at this time.
- Turn the ignition switch to LOCK (0).
- Disconnect these connectors:
- Connect driver's MPCS unit connector A (40P) terminal No. 8 to body ground with a jumper wire.
- Check for continuity between front passenger's MPCS unit connector A (28P) terminal No. 4 and body ground.Fig 2: Checking Continuity Between Front Passenger's MPCS Unit Connector A (28P) Terminal No. 4 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Go to step 9.
NO -Repair an open in the wire, or replace the faulty passenger's under-dash fuse/relay box.
- Check for continuity between right rear power window switch 14P connector terminal No. 2 and body ground.Fig 3: Checking Continuity Between Right Rear Power Window Switch 14P Connector Terminal No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Go to step 10.
NO -Repair an open in the wire, or replace the faulty passenger's under-dash fuse/relay box.
- Check for continuity between left rear power window switch 14P connector terminal No. 2 and body ground.Fig 4: Checking Continuity Between Left Rear Power Window Switch 14P Connector Terminal No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Go to step 11.
NO -Repair an open in the wire.
- Remove the jumper wire from the driver's MPCS unit connector A (40P).
- Check for continuity between driver's MPCS unit connector A (40P) terminal No. 8 and power window master switch 6P connector terminal No. 6.Fig 5: Checking Continuity Between Driver's MPCS Unit Connector A (40P) And Power Window Master Switch 6P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Go to step 13.
NO -Repair an open in the wire.
- Substitute a known-good power window master switch, and do the power window control unit learning procedure (see RESETTING THE POWER WINDOW CONTROL UNIT ).
- Connect these connectors:
- Turn the ignition switch to ON (II).
- Clear the DTCs with the HDS.
- Open and close the each window by operating the power window master switch.
- Check for DTCs with the HDS.
Is DTC B2188 indicated?
YES -Go to step 19.
NO -The original power window master switch is faulty; replace it.
- Turn the ignition switch to LOCK (0).
- Substitute a known-good front passenger's MPCS unit.
- Turn the ignition switch to ON (II).
- Clear the DTCs with the HDS.
- Open and close the front passenger's power window by operating the front passenger's power window switch.
- Check for DTCs with the HDS.
Is DTC B2188 indicated?
YES -Go to step 25.
NO -The original front passenger's MPCS unit is faulty; replace it.
- Turn the ignition switch to LOCK (0).
- Substitute a known-good left rear power window switch.
- Turn the ignition switch to ON (II).
- Clear the DTCs with the HDS.
- Open and close the left rear power window by operating the left rear power window switch.
- Check for DTCs with the HDS.
Is DTC B2188 indicated?
YES -Go to step 31.
NO -The original left rear power window switch is faulty; replace it.
- Turn the ignition switch to LOCK (0).
- Substitute a known-good right rear power window switch.
- Turn the ignition switch to ON (II).
- Clear the DTCs with the HDS.
- Open and close the right rear power window by operating the right rear power window switch.
- Check for DTCs with the HDS.
Is DTC B2188 indicated?
YES -Replace the driver's MPCS unit.
NO -The original right rear power window power switch is faulty; replace it.