DTC B2191: Front Passenger's MPCS Unit Internal (EEPROM) Error Acura RL 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 56

1. Turn the ignition switch to LOCK (0).
2. Remove the driver's door panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(ref-348568-S32747857942009112400000) ).
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 these input tests at the connectors. 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. TEST RESULT REFERENCE Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A8 GRY Driver's under-dash fuse/relay box connector H (14P) and power window master switch 6P connector disconnected Check for continuity between terminal A8 and driver's under-dash fuse/relay box connector J (21P) terminal No. 1, and terminal A8 and power window master switch 6P connector terminal No. 6: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire B10 PUR 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 B12 ORN B10 PUR Driver's power window switch released Check for continuity between the terminals: There should be continuity. Faulty power window master switch An open in the wire B12 ORN B10 PUR 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 in the wire B13 PNK B10 PUR 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 B13 PNK B9 LT 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 in the wire B2 LT BLU B9 LT GRN 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 B2 LT BLU B1 LT GRN Connect terminals B8 and B1 with a jumper wire, and connect terminal B7 to body ground. Check the driver's power window motor operation: The motor should run (the window should go down). Blown No. 27 (30 A) fuse in the driver's under-dash fuse/relay box Faulty driver's power window motor An open in the wire B7 BLU Connect terminals B8 and B7 with a jumper wire, and connect terminal B1 to body ground. Check the driver's power window motor operation: The motor should run (the window should go up). Blown No. 27 (30 A) fuse in the driver's under-dash fuse/relay box Faulty driver's power window motor An open in the wire
6. Reconnect the connectors to the driver's MPCS unit, and do these input tests at the connectors. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the control unit must be faulty; replace the driver's MPCS unit and go to step 7. TEST RESULT REFERENCE Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A5 BLK Under all conditions Measure the voltage to ground: There should be less than 0.1 V. Poor ground (G601) Faulty driver's under-dash fuse/relay box An open in the wire B14 BLK Under all conditions Measure the voltage to ground: There should be less than 0.1 V. Poor ground (G601) Faulty driver's under-dash fuse/relay box An open in the wire A7 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 15 (40 A) fuse in the under-hood fuse/relay box Blown No. 7 (10 A) fuse in the driver's under-dash fuse/relay box Faulty driver's under-dash fuse/relay box An open in the wire B8 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 23 (P/W) (50 A) fuse in the under-hood fuse/relay box Blown No. 27 (30 A) fuse in the driver's under-dash fuse/relay box Faulty driver's under-dash fuse/relay box An open in the wire A25 YEL Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Blown No. 21 (10 A) fuse in the driver's under-dash fuse/relay box Faulty driver's under-dash fuse/relay box An open in the wire B9 LT GRN Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Faulty driver's MPCS unit Faulty power window master switch A short to ground in the wire B3 RED Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Faulty driver's MPCS unit An open in the wire B6 GRN Under all conditions Measure the continuity to ground: There should be continuity. Poor ground (G601) Faulty driver's MPCS unit An open in the wire B5 GRY Ignition switch ON (II) and driver's power window motor runs by connecting terminals B8 and B1 with a jumper wire, and connect terminal B7 to body ground. Measure the voltage between terminals B5 and B6: There should be 0-about 5 V-0- about 5 V repeatedly (a digital voltmeter reads about 2.5 V while the window moves). Blown No. 27 (30 A) fuse in the driver's under-dash fuse/relay box Faulty driver's MPCS unit Faulty driver's power window motor An open in the wire B4 BRN Ignition switch ON (II) and driver's power window motor runs by connecting terminals B8 and B1 with a jumper wire, and connect terminal B7 to body ground. Measure the voltage between terminals B4 and B6: There should be 0-about 5 V-0- about 5 V repeatedly (a digital voltmeter reads about 2.5 V while the window moves). Blown No. 27 (30 A) fuse in the driver's under-dash fuse/relay box Faulty driver's MPCS unit Faulty driver's power window motor An open in the wire
7. Reset the power window control unit (see «RESETTING THE POWER WINDOW CONTROL UNIT»(ref-348569-S17462322062009112400000) ).

Scheme 57

1. Turn the ignition switch to LOCK (0).
2. Remove the front passenger's door panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(ref-348568-S32747857942009112400000) ).
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 these input tests at the connectors. 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. TEST RESULT REFERENCE Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A4 GRY Driver's under-dash fuse/relay box connector X(39P) and right rear power window switch 14P connector disconnected Check for continuity between terminal A4 and driver's under-dash fuse/relay box connector X (39P) terminal No. 15, and terminal A4 and right rear power window switch 14P connector terminal No. 2: There should be continuity. Faulty passenger's under-dash fuse/relay box An open in the wire Check for continuity to ground: There should be no continuity. Faulty passenger's under-dash fuse/relay box A short to ground in the wire B2 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 in the wire A24 BLU B2 LT BLU 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 BLU B13 GRY 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 in the wire A24 BLU B13 GRY 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 BLU B11 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 in the wire A24 BLU B11 BRN Front passenger's power window switch released Check for continuity between the terminals: There should no continuity. Faulty front passenger's power window switch A short to ground in the wire A24 BLU B9 WHT Under all conditions Connect battery power to terminal A24 and ground terminal B9. The LED should come on. Faulty front passenger's power window switch Faulty LED An open in the wire A24 BLU B10 RED Front passenger's power window switch DOWN Check for continuity between the terminals: There should be continuity between terminals B10 and A22, and no continuity between terminals B10 and B12. Faulty front passenger's power window switch An open in the wire A short to ground in the wire B12 PNK A22 PUR B10 RED Front passenger's power window switch in released Check for continuity between the terminals: There should be continuity between terminals B10 and B12, and no continuity between terminals B10 and A22. Faulty front passenger's power window switch An open in the wire A short to ground in the wire B12 PNK A22 PUR B1 LT GRN Connect terminals B8 and B1 with a jumper wire, and connect terminal B7 to body ground. Check the front passenger's power window motor operation: The motor should run (the window should go down). Blown No. 3 (30 A) fuse in the passenger's under-dash fuse/relay box Faulty front passenger's power window motor An open in the wire B7 BLU Connect terminals B8 and B7 with a jumper wire, and connect terminal B1 to body ground. Check the front passenger's power window motor operation: The motor should run (the window should go up). Blown No. 3 (30 A) fuse in the passenger's under-dash fuse/relay box Faulty front passenger's power window motor An open in the motor
6. Reconnect the connectors to the front passenger's MPCS unit, and do these input tests at the connectors. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the control unit must be faulty; replace the front passenger's MPCS unit and go to step 7. TEST RESULT REFERENCE Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A7 BLK Under all conditions Measure the voltage to ground: There should be less than 0.1 V. Poor ground (G506) An open in the wire B14 BLK Under all conditions Measure the voltage to ground: There should be less than 0.1 V. Poor ground (G506) An open in the wire A2 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 15 (40 A) fuse in the under-hood fuse/relay box Blown No. 7 (10 A) fuse in the driver's under-dash fuse/relay box Faulty passenger's under-dash fuse/ relay box An open in the wire B8 GRN Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 22 (70 A) fuse in the under-hood fuse/relay box Blown No. 3 (30 A) fuse in the passenger's under-dash fuse/relay box Faulty passenger's under-dash fuse/ relay box An open 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 in the wire B6 YEL Under all conditions Measure the continuity to ground: There should be continuity. Poor ground (G506) Faulty front passenger's MPCS unit An open in the wire B5 BLU Ignition switch ON (II) and front passenger's power window motor runs by connecting terminals B8 and B1 with a jumper wire, and connect terminal B7 to body ground. Measure the voltage between terminals B5 and B6: There should be 0-about 5 V-0- about 5 V repeatedly (a digital voltmeter reads about 2.5 V while the window moves). Blown No. 3 (30 A) fuse in the passenger's under-dash fuse/relay box Faulty front passenger's MPCS unit Faulty front passenger's power window motor An open in the wire B4 ORN Ignition switch ON (II) and front passenger's power window motor runs by connecting terminals B8 and B1 with a jumper wire, and connect terminal B7 to body ground. Measure the voltage between terminals B4 and B6: There should be 0-about 5 V-0- about 5 V repeatedly (a digital voltmeter reads about 2.5 V while the window moves). Blown No. 3 (30 A) fuse in the passenger's under-dash fuse/relay box Faulty front passenger's MPCS unit Faulty front passenger's power window motor An open in the wire
7. Reset the power window control unit (see «RESETTING THE POWER WINDOW CONTROL UNIT»(ref-348569-S17462322062009112400000) ).

Scheme 58

1. Turn the ignition switch to LOCK (0).
2. Remove the left rear power window switch (see «POWER WINDOW MASTER SWITCH REPLACEMENT»(ref-348569-S35088259202009112400000) ).
3. Disconnect the 14P connector (A) from the left rear power window switch (B).
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 connector still disconnected, do these input tests at the connector. 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. TEST RESULT REFERENCE Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 2 GRY Driver's under-dash fuse/ relay box connector H (14P) disconnected Check for continuity between terminal No. 2 and driver's under-dash fuse/relay box connector H (14P) terminal No. 4: There should be continuity. An open in the wire Check for continuity to ground: There should be no continuity. A short to ground in the wire 1 YEL Connect terminals No. 8 and No. 1 with a jumper wire, and connect terminal No. 7 to body ground. Check the left rear power window motor operation: The motor should run (the window should go down). Blown No. 24 (20 A) fuse in the driver's under-dash fuse/relay box Faulty left rear power window motor An open in the wire 7 BLU Connect terminals No. 8 and No. 7 with a jumper wire, and connect terminal No. 1 to body ground. Check the left rear power window motor operation: The motor should run (the window should go up). Blown No. 24 (20 A) fuse in the driver's under-dash fuse/relay box Faulty left rear power window motor An open in the wire
6. Reconnect the connector to the left rear power window switch, and do these input tests at the connector. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the left rear power window switch must be faulty; replace it (see «POWER WINDOW MASTER SWITCH REPLACEMENT»(ref-348569-S35088259202009112400000) ) and go to step 7. TEST RESULT REFERENCE Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 6 BLK Under all conditions Measure the voltage to ground: There should be less than 0.1 V. Poor ground (G601) An open in the wire 14 BLK Under all conditions Measure the voltage to ground: There should be less than 0.1 V. Poor ground (G601) An open in the wire 8 RED Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 23 (P/W) (50 A) fuse in the under-hood fuse/relay box Blown No. 24 (20 A) fuse in the driver's under-dash fuse/relay box Faulty driver's under-dash fuse/relay box An open in the wire 3 PNK Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Faulty left rear power window switch An open in the wire 5 GRN Ignition switch ON (II) and left rear power window motor runs by connecting terminals No. 8 and No. 1 with a jumper wire, and connect terminal No. 7 to body ground. Measure the voltage between terminals No. 5 and No. 6: There should be 0-about 5 V- 0-about 5 V repeatedly (a digital voltmeter reads about 2.5 V while the window moves). Blown No. 24 (20 A) fuse in the driver's under-dash fuse/relay box Faulty left rear power window switch Faulty left rear power window motor An open in the wire 4 ORN Ignition switch ON (II) and left rear power window motor runs by connecting terminals No. 8 and No. 1 with a jumper wire, and connect terminal No. 7 to body ground. Measure the voltage between terminals No. 4 and No. 6: There should be 0-about 5 V- 0-about 5 V repeatedly (a digital voltmeter reads about 2.5 V while the window moves). Blown No. 24 (20 A) fuse in the driver's under-dash fuse/relay box Faulty left rear power window switch Faulty left rear power window motor An open in the wire
7. Reset the power window control unit (see «RESETTING THE POWER WINDOW CONTROL UNIT»(ref-348569-S17462322062009112400000) ).

Scheme 59

1. Turn the ignition switch to LOCK (0).
2. Remove the right rear power window switch (see «POWER WINDOW MASTER SWITCH REPLACEMENT»(ref-348569-S35088259202009112400000) ).
3. Disconnect the 14P connector (A) from the right rear power window switch (B)
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 connector still disconnected, do these input tests at the connector. 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. TEST RESULT REFERENCE Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 2 GRY Driver's under-dash fuse/ relay box connector X (39P) and passenger's MPCS unit connector A (28P) disconnected Check for continuity between terminal No. 2 and driver's under-dash fuse/relay box connector X (39P) terminal No. 15: There should be continuity. Faulty passenger's under-dash fuse/relay box An open in the wire Check for continuity to ground: There should be no continuity. Faulty passenger's under-dash fuse/relay box A short to ground in the wire 1 RED Connect terminals No. 8 and No. 1 with a jumper wire, and connect terminal No. 7 to body ground. Check the right rear power window motor operation: The motor should run (the window should go down). Blown No. 5 (20 A) fuse in the passenger's under-dash fuse/relay box Faulty right rear power window motor An open in the wire 7 BLU Connect terminals No. 8 and No. 7 with a jumper wire, and connect terminal No. 1 to body ground. Check the right rear power window motor operation: The motor should run (the window should go up). Blown No. 5 (20 A) fuse in the passenger's under-dash fuse/relay box Faulty right rear power window motor An open in the wire
6. Reconnect the connector to the right rear power window switch, and do these input tests at the connector. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the right rear power window switch must be faulty; replace it (see «POWER WINDOW MASTER SWITCH REPLACEMENT»(ref-348569-S35088259202009112400000) ) and go to step 7. TEST RESULT REFERENCE Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained 6 BLK Under all conditions Measure the voltage to ground: There should be less than 0.1 V. Poor ground (G651) An open in the wire 14 BLK Under all conditions Measure the voltage to ground: There should be less than 0.1 V. Poor ground (G651) An open in the wire 8 PUR Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 22 (70 A) fuse in the under-hood fuse/relay box Blown No. 5 (20 A) fuse in the passenger's under-dash fuse/relay box Faulty passenger's under-dash fuse/relay box An open in the wire 3 PNK Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage. Faulty right rear power window switch An open in the wire 5 LT GRN Ignition switch ON (II) and right rear power window motor runs by connecting terminals No. 8 and No. 1 with a jumper wire, and connect terminal No. 7 to body ground. Measure the voltage between terminals No. 5 and No. 6: There should be 0-about 5 V- 0-about 5 V repeatedly (a digital voltmeter reads about 2.5 V while the window moves). Blown No. 5 (20 A) fuse in the passenger's under-dash fuse/relay box Faulty right rear power window switch Faulty right rear power window motor An open in the wire 4 ORN Ignition switch ON (II) and right rear power window motor runs by connecting terminals No. 8 and No. 1 with a jumper wire, and connect terminal No. 7 to body ground. Measure the voltage between terminals No. 4 and No. 6: There should be 0-about 5 V- 0-about 5 V repeatedly (a digital voltmeter reads about 2.5 V while the window moves). Blown No. 5 (20 A) fuse in the passenger's under-dash fuse/relay box Faulty right rear power window switch Faulty right rear power window motor An open in the wire
7. Reset the power window control unit (see «RESETTING THE POWER WINDOW CONTROL UNIT»(ref-348569-S17462322062009112400000) ).