DTC B2187: Communication Line (UART Line) Circuit Short
- Clear the DTCs with the HDS.
- Turn the ignition switch to LOCK (0) and then back to ON (II).
- Operate the front passenger's, left rear and right rear power window switches.
- Check for DTCs with the HDS.
Is DTC B2187 indicated?
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:
- Check for continuity between driver's MPCS unit connector A (40P) terminal No. 8 and body ground.Fig 1: Checking Continuity Between Driver's MPCS Unit Connector A (40P) Terminal No. 8 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair short to ground in the wire.
NO -Go to step 8.
- Turn the ignition switch to ON (II).
- Measure the voltage between driver's MPCS unit connector A (40P) terminal No. 8 and body ground.Fig 2: Measuring Voltage Between Driver's MPCS Unit Connector A (40P) Terminal No. 8 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there voltage?
YES -Repair short to power in the wire.
NO -Go to step 10.
- Clear the DTCs with the HDS.
- Turn the ignition switch to LOCK (0) and then back to ON (II).
- Wait for at least 6 seconds.
- Check for DTCs with the HDS.
Is DTC B2187 indicated?
YES -Replace the driver's MPCS unit.
NO -Go to step 14.
- Reconnect the power window master switch 6P connector.
- Clear the DTCs with the HDS.
- Turn the ignition switch to LOCK (0) and then back to ON (II).
- Operate each switch of the power window master switch.
- Check for DTCs with the HDS.
Is DTC B2187 indicated?
YES -Replace the power window master switch.
NO -Go to step 19.
- Reconnect front passenger's MPCS unit connector A (28P).
- Clear the DTCs with the HDS.
- Turn the ignition switch to LOCK (0) and then back to ON (II).
- Operate the front passenger's power window switch in each direction.
- Check for DTCs with the HDS.
Is DTC B2187 indicated?
YES -Replace the front passenger's MPCS unit.
NO -Go to step 24.
- Reconnect the right rear power window switch 14P connector.
- Clear the DTCs with the HDS.
- Turn the ignition switch to LOCK (0) and then back to ON (II).
- Operate the right rear power window switch in each direction.
- Check for DTCs with the HDS.
Is DTC B2187 indicated?
YES -Replace the right rear power window switch.
NO -Go to step 29.
- Reconnect the left rear power window switch 14P connector.
- Clear the DTCs with the HDS.
- Turn the ignition switch to LOCK (0) and then back to ON (II).
- Operate the left rear power window switch in each direction.
- Check for DTCs with the HDS.
Is DTC B2187 indicated?
YES -Replace the left rear power window switch.
NO -Go to step 34.
- Reconnect the moonroof motor/control unit 8P connector.
- Clear the DTCs with the HDS.
- Turn the ignition switch to LOCK (0) and then back to ON (II).
- Open and close the moonroof with the moonroof switch.
- Check for DTCs with the HDS.
Is DTC B2187 indicated?
YES -Replace the moonroof motor/control unit.
NO -Replace the driver's MPCS unit.