DTC B2191: Front Passenger's MPCS Unit Internal Error (EEPROM error) Acura MDX II 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 ).

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Check for DTCs with the HDS. Is DTC B2191 indicated? YES -Replace the front passenger's MPCS unit. NO -Intermittent failure, the system is OK at this time.

Scheme 26

1. Turn the ignition switch to LOCK (0).
2. Remove the driver's door panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(ref-510498-S16846526992012102300000) ).
3. Disconnect driver's MPCS unit (A) connectors A (40P) and B (14P).
4. Inspect the connector and socket terminals to be sure they are all making good contact. If the terminals are bent, loose, or corroded, repair them as necessary, and recheck the system. If the terminals look OK, go to step 5.
5. With the connectors still disconnected, do the following input tests: If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, go to step 6. Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A8 GRY Under-dash fuse/relay box connector J (21P) and power window master switch 14P connector disconnected Check for continuity between terminal A8 and under-dash fuse/relay box connector J (12P) terminal No. 1, and terminal A8 and power window master switch 14P connector terminal No. 13: There should be continuity. An open or high resistance in the wire Check for continuity to ground: There should be no continuity. Short to ground in the wire A39 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 3 (P/W) (50 A) fuse in the main under-hood fuse box Faulty main under-hood fuse box Faulty under-dash fuse/relay box Faulty power window relay An open or high resistance in the wire A3 ORN Connect terminal A39 to body ground, and connect terminals A3 and B8 with a Jumper wire. Check the left rear power window motor operation: The motor should run (the power window should go up). Blown No. 24 (20 A) fuse in the under-dash fuse/relay box Blown No. 3 (P/W) (50 A) fuse in the main under-hood fuse box Blown No. 27 (30 A) fuse in the under-dash fuse/relay box Faulty main under-hood fuse box Faulty under-dash fuse/relay box Poor ground (G601) or an open in the ground wire Faulty power window relay Faulty left rear power window switch Faulty left rear power window motor An open or high resistance in the wire A32 YEL Connect terminal A39 to body ground, and connect terminals A32 and B8 with a jumper wire. Check the left rear power window motor operation: The motor should run (the power window should go down). B1 YEL Connect terminals B8 and B1, and terminals B7 and B14 with jumper wires. Check the driver's power window motor operation: The motor should run (the power window should go down). Blown No. 27 (30 A) fuse in the under-dash fuse/relay box Blown No. 3 (P/W) (50 A) fuse in the main under-hood fuse box Faulty main under-hood fuse box Faulty under-dash fuse/relay box Poor ground (G601) or an open in the ground wire Faulty driver's power window motor An open or high resistance in the wire B7 BLU Connect terminals B8 and B7, and terminals B1 and B14 with jumper wires. Check the driver's power window motor operation: The motor should run (the power window should go up). B9 B2 LT GRN GRN Driver's power window switch in UP position Check for continuity between the terminals: There should be continuity. Faulty power window master switch An open or high resistance in the wire Driver's power window switch released Check for continuity between the terminals: There should be no continuity. Faulty power window master switch A short to ground in the wire B10.B12 PUR.ORN Under all conditions (except pressing the driver's power window switch DOWN position) Check for continuity between the terminals: There should be continuity. Faulty power window master switch An open or high resistance in the wire Driver's power window switch in DOWN position Check for continuity between the terminals: There should be no continuity. Faulty power window master switch A short to ground in the wire B10.B13 PUR.RED Driver's power window switch in DOWN position Check for continuity between the terminals: There should be continuity. Faulty power window master switch An open or high resistance in the wire Driver's power window switch released Check for continuity between the terminals: There should be no continuity. Faulty power window master switch A short to ground in the wire
6. Reconnect the connectors, and do the following input tests: If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, replace the driver's MPCS unit, then go to step 7. Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A5 BLK In all ignition switch positions Measure the voltage to ground: There should be less than 0.2 V. Poor ground (G601) or an open in the ground wire An open or high resistance in the wire Faulty under-dash fuse/relay box B14 A7 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 4 (40 A) fuse in the main under-hood fuse box Faulty main under-hood fuse box Blown No. 7 (10 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire B8 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 3 (P/W) (50 A) fuse in the main under-hood fuse box Faulty main under-hood fuse box Blown No. 27 (30 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire A25 YEL Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire B3 PNK Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Faulty driver's MPCS unit An open or high resistance in the wire A short to ground in the wire B4 BRN Ignition switch ON (II), and driver's power window moving up or down. Measure the voltage between terminals B4 and B6: An analog voltmeter should alternate between 0 V and about 5 V (a digital voltmeter should read about 2.5 V while the window moves). Faulty power window master switch Faulty driver's MPCS unit Faulty driver's power window motor An open or high resistance in the wire A short to ground in the wire B5 GRY Ignition switch ON (II), and driver's power window moving up or down. Measure the voltage between terminals B5 and B6: An analog voltmeter should alternate between 0 V and about 5 V (a digital voltmeter should read about 2.5 V while the window moves). B6 WHT Ignition switch ON (II) Check for continuity to ground: There should be continuity. Poor ground (G601) or an open in the ground wire Faulty under-dash fuse/relay box Faulty driver's MPCS unit An open or high resistance in the wire B9 LT GRN Under all conditions, disconnect the driver's power window motor 6P connector. Measure the voltage to ground: There should be battery voltage. Faulty driver's MPCS unit Faulty power window master switch An open or high resistance in the wire A short to ground in the wire
7. Reset the «power window control unit»(ref-510499-S29613553802012102300000)

Scheme 27

1. Turn the ignition switch to LOCK (0).
2. Remove the front passenger's door panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(ref-510498-S16846526992012102300000) ).
3. Disconnect front passenger's MPCS unit (A) connectors A (28P) and B (14P).
4. Inspect the connector and socket terminals to be sure they are all making good contact. If the terminals are bent, loose, or corroded, repair them as necessary, and recheck the system. If the terminals look OK, go to step 5.
5. With the connectors still disconnected, do the following input tests: If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, go to step 6. Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A4 GRY Under-dash fuse/relay box connector X (39P) and the moonroof control unit/motor 10P connector disconnected Check for continuity between terminal A4 and under-dash fuse/relay box connector X (39P) terminal No. 15: There should be continuity. An open or high resistance in the wire Check for continuity to ground: There should be no continuity. Short to ground in the wire A3 YEL Ignition switch ON (II), connect terminals A3 and B8 with a jumper wire. Check the right rear power window motor operation: The motor should run (the power window should go down). Blown No. 26 (30 A) fuse in the under-dash fuse/relay box Blown No. 3 (P/W) (50 A) fuse in the main under-hood fuse box Blown No. 25 (20 A) fuse in the under-dash fuse/relay box Faulty main under-hood fuse box Faulty under-dash fuse/relay box Poor ground (G606) or an open in the ground wire Faulty power window relay Faulty right rear power window switch Faulty right rear power window motor An open or high resistance in the wire A28 ORN Ignition switch ON (II), connect terminals A28 and B8 with a jumper wire. Check the right rear power window motor operation: The motor should run (the power window should go up). B1 RED Connect terminals B8 and B1, and terminals B7 and B14 with jumper wires. Check the front passenger's power window motor operation: The motor should run (the power window should go down). Blown No. 26 (30 A) fuse in the under-dash fuse/relay box Blown No. 3 (P/W) (50 A) fuse in the main under-hood fuse box Faulty main under-hood fuse box Faulty under-dash fuse/relay box Poor ground (G507) or an open in the ground wire Faulty front passenger's power window motor An open or high resistance in the wire B7 BLU Connect terminals B8 and B7, and terminals B1 and B14 with jumper wires. Check the front passenger's power window motor operation: The motor should run (the power window should go up). A24.B2 WHT.LT BLU Front passenger's power window switch in AUTO position Check for continuity between the terminals: There should be continuity. Faulty front passenger's power window switch An open or high resistance in the wire Front passenger's power window switch released Check for continuity between the terminals: There should be no continuity. Faulty front passenger's power window switch A short to ground in the wire A24.B11 WHT.BRN Front passenger's power window switch in DOWN position Check for continuity between the terminals: There should be continuity. Faulty front passenger's power window switch An open or high resistance in the wire Front passenger's power window switch released Check for continuity between the terminals: There should be no continuity. Faulty front passenger's power window switch A short to ground in the wire A24.B13 WHT.WHT Front passenger's power window switch in UP position Check for continuity between the terminals: There should be continuity. Faulty front passenger's power window switch An open or high resistance in the wire Front passenger's power window switch released Check for continuity between the terminals: There should be no continuity. Faulty front passenger's power window switch A short to ground in the wire A22.B10 BLK.RED Front passenger's power window switch in DOWN position Check for continuity between the terminals: There should be continuity. Faulty front passenger's power window switch An open or high resistance in the wire Front passenger's power window switch released Check for continuity between the terminals: There should be no continuity. Faulty front passenger's power window switch A short to ground in the wire B10.B12 RED.GRN Under all conditions (except pressing the front passenger's power window switch DOWN position) Check for continuity between the terminals: There should be continuity. Faulty front passenger's power window switch An open or high resistance in the wire Front passenger's power window switch in DOWN position Check for continuity between the terminals: There should be no continuity. Faulty front passenger's power window switch A short to ground in the wire
6. Reconnect the connectors, and do the following input tests: If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, replace the front passenger's MPCS unit, then go to step 7. Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A7 BLK In all ignition switch positions Measure the voltage to ground: There should be less than 0.2 V. Poor ground (G506) or an open in the ground wire An open or high resistance in the wire B14 BLK In all ignition switch positions Measure the voltage to ground: There should be less than 0.2 V. Poor ground (G507) or an open in the ground wire An open or high resistance in the wire A2 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 4 (40 A) fuse in the main under-hood fuse box Faulty main under-hood fuse box Blown No. 7 (10 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire B8 GRN Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 3 (P/W) (50 A) fuse in the main under-hood fuse box Faulty main under-hood fuse box Blown No. 26 (30 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire B3 GRN Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Faulty front passenger's MPCS unit An open or high resistance in the wire A short to ground in the wire B4 ORN Ignition switch ON (II), and front passenger's power window moving up or down. Measure the voltage between B4 and B6 terminals: An analog voltmeter should alternate between 0 V and about 5 V (a digital voltmeter should read about 2.5 V while the window moves). Faulty front passenger's power window switch Faulty front passenger's MPCS unit Faulty front passenger' s power window motor An open or high resistance in the wire A short to ground in the wire B5 LT GRN Ignition switch ON (II), and front passenger's power window moving up or down. Measure the voltage between B5 and B6 terminals: An analog voltmeter should alternate between 0 V and about 5 V (a digital voltmeter should read about 2.5 V while the window moves). B6 GRY In all ignition switch positions, disconnect the front passenger's power window motor 6P connector. Check for continuity to ground: There should be continuity. Poor ground (G506) or an open in the ground wire Faulty front passenger's MPCS unit An open or high resistance in the wire
7. Reset the «power window control unit»(ref-510499-S29613553802012102300000)

Scheme 28

Scheme 29

Scheme 30

Scheme 31

1. Remove the door panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(ref-510498-S16846526992012102300000) ), and disconnect the driver's door wire harness B 28P connector (A) from the driver's door wire harness A.
2. At the driver's door wire harness B 28P connector, test the power window motor in each direction by connecting battery power and ground according to the table. When the motor stops running, disconnect one lead immediately.
3. If the motor does not run or fails to run smoothly, go to step 4.
4. Disconnect the 6P connector (A) from the driver's power window motor (B).
5. Check for continuity between driver's power window motor 6P connector terminals No. 3 and No. 6 and the driver's door wire harness B 28P connector terminals No. 27 and No. 28 respectively. There should be continuity. If there is no continuity, repair an open in the wire. If there is continuity, replace the power window motor.
6. After replacing the power window motor, reset the «power window control unit»(ref-510499-S29613553802012102300000)

Scheme 32

Scheme 33

Scheme 34

Scheme 35

1. Remove the door panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(ref-510498-S16846526992012102300000) ), and disconnect the front passenger's door wire harness 20P connector (A) from the front passenger's door subharness.
2. At the front passenger's door wire harness 20P connector, test the power window motor in each direction by connecting battery power and ground according to the table. When the motor stops running, disconnect one lead immediately.
3. If the motor does not run or fails to run smoothly, go to step 4.
4. Disconnect the 6P connector (A) from the front passenger's power window motor (B).
5. Check for continuity between front passenger's power window motor 6P connector terminals No. 1 and No. 4 and the front passenger's door wire harness 20P connector terminals No. 2 and No. 20 respectively. There should be continuity. If there is no continuity, repair an open in the wire. If there is continuity, replace the power window motor.
6. After replacing the power window motor, «reset the power window control unit»(ref-510499-S29613553802012102300000)

Scheme 36

Scheme 37

Scheme 38

Scheme 39

Scheme 40

1. Remove the door panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(ref-510498-S16846526992012102300000) ), and disconnect the rear power window switch 14P connector (A).
2. Test the power window motor in each direction by connecting battery power and ground according to the table. When the motor stops running, disconnect one lead immediately.
3. If the motor does not run or fails to run smoothly, go to step 4.
4. Disconnect the 6P connector (A) from the rear power window motor (B). The illustration shows the right rear door, the left rear door is similarly configured.
5. Check for continuity between rear power window motor 6P connector terminals No. 1 and No. 2 and rear power window switch 14P connector terminals No. 1 and No. 7 respectively. There should be continuity. If there is no continuity, repair an open in the wire. If there is continuity, replace the power window motor.
6. After replacing the power window motor, «reset the power window control unit»(ref-510499-S29613553802012102300000)

Scheme 41

Scheme 42

1. Remove the front passenger's door panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(ref-510498-S16846526992012102300000) ), and disconnect the 14P connector from the front passenger's power window switch.
2. Check for continuity between the terminals in each switch position according to the table.
3. If the continuity is not as specified, «replace the switch»(ref-510499-S07579050532012102300000)

Scheme 43

1. Remove the rear door panel (see «FRONT DOOR SIDE SILL SEAL REPLACEMENT»(ref-510498-S33406236032012102300000) ), and disconnect the 14P connector from the rear power window switch.
2. Remove the power window switch panel (see «FRONT DOOR SIDE SILL SEAL REPLACEMENT»(ref-510498-S33406236032012102300000) ).
3. Remove the three mounting screws and the rear power window switch (A).
4. Swap the rear power window switch with another known-good power window switch and test. If the original power window switch is faulty; replace it.
5. Install the switch in the reverse order of removal.
6. «Reset the power window control unit»(ref-510499-S29613553802012102300000)

Scheme 44

1. Remove the driver's door panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(ref-510498-S16846526992012102300000) ), and disconnect the 14P connector from the power window master switch.
2. Remove the power window switch panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(ref-510498-S16846526992012102300000) ).
3. Remove the four mounting screws and the power window master switch (A).
4. Install the switch in the reverse order of removal.
5. «Reset the power window control unit»(ref-510499-S29613553802012102300000)

Scheme 45

1. Remove the front passenger's door panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(ref-510498-S16846526992012102300000) ), and disconnect the 14P connector from the front passenger's power window switch.
2. Remove the power window switch panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(ref-510498-S16846526992012102300000) ).
3. Remove the three mounting screws and the front passenger's power window switch (A).
4. Install the switch in the reverse order of removal.
5. «Reset the power window control unit»(ref-510499-S29613553802012102300000)