Driving Position Memory Systems (dpms) Acura MDX I

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System Description

The driver's seat and the power mirrors have a memory feature. The seat and mirror adjustments can be regulated separately. All the adjustments can be memorized by pressing the MEMO button on the driving position memory switch, and then pressing one of two position buttons within 5 seconds. Pressing the appropriate position button will move the seat and the mirrors to the memorized positions.

This system is related with the multiplex control system, and has wake-up and sleep mode. All digital signals are sent via shared multiplex communication line. For more information about communication line and wake-up/sleep mode, refer to SYSTEM DESCRIPTION .

Note. Disconnecting the battery will cancel the memorized positions. To turn remote DPMS feature ON or OFF, refer to TRANSMITTER TEST .

Memory Retrieve

When one of the two buttons on the driving position memory switch is pressed with the vehicle parked (A/T in P position) and the driver's door closed, the seat and the mirrors move to the memorized positions.

Power Seat Position Sensors

Each motor has Hall effect type sensor which detects motor rotation and sends a pulse to the power seat control unit when the motor rotates. The control unit stores the number of pulses in its memory, and the seat position is memorized.

Power Mirror Position Sensors

By means of a resistive type tilt position sensor and swing position sensor, the power mirror control circuit in the passenger's multiplex control unit detects the voltage changes caused by the movements of the mirrors. These voltage changes are stored in memory, and the power mirror positions are memorized.

Reverse Mirror Control

When the vehicle is shifted to Reverse (A/T in R position), the passenger's side mirror tilts down automatically to help the driver's view. The passenger's side mirror will return to previous position by memory when the shift lever is shifted out of R position. The mirror switch must be in the center position for the reverse mirror control to operate.

General Troubleshooting Information

The self-diagnostic function of the driving position memory system detects system problems. This information can be retrieved by displaying diagnostic trouble code.

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1. Turn the ignition switch OFF, and move the seat to a non-memorized position.
2. Press and hold the MEMO button (A) and both position buttons (B) at the same time.
3. Turn the ignition switch ON (II), and wait at least 1 second, then release the three buttons.
4. After 1 second, the position button indicators (C) will blink to show the DTC.

No System Problem Pattern

If there is no DTC stored, the indicators blink only once (3 seconds).

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System Problem Pattern

If a system problem occurs and a DTC is stored, the indicators will show the DTC. The first digit is indicated by the number of long (1 second) blinks, and the second digit is indicated by the number of short (0.26 second) blinks. There is a 3 second break between each DTC when there are multiple DTCs.

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Canceling the DTC Indication

1. Turn the ignition switch OFF or
2. Press the MEMO button, or position button 1, or position button 2, or
3. Press one of the driving position adjustment switches.

Erasing the DTC from Memory

Make sure you have the anti-theft code for the radio and the navigation system, then write down the frequencies for the radio's preset buttons. Disconnect the negative battery cable for at least 30 seconds. After reconnecting the battery, enter the anti-theft codes for the radio and the navigation system, then enter the customer's radio station presets. Reset the clock. Perform the powertrain control module (PCM) idle learn procedure (see PCM IDLE LEARN PROCEDURE ) and the power window control unit reset procedure (see RESETTING THE POWER WINDOW CONTROL UNIT ).

Diagnostic Trouble Code (DTC) Index

DTC INDEX

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Control Unit Input Test

Before testing the driving position memory control functions, troubleshoot the multiplex control system (see TROUBLESHOOTING ).

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1. Remove the driver's multiplex control unit from the driver's under-dash fuse/relay box, and disconnect its connector.
2. Inspect all 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 3.
3. With the driver's multiplex control unit still disconnected, make 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 4. CONTROL UNIT INPUT TEST (DRIVER'S UNIT - 1 OF 2) Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained A14 Fuse/relay box socket Under all conditions Check for continuity to ground: There should be continuity. Poor ground (G401) Faulty driver's fuse/relay box An open in the wire B11 BLK Under all conditions Check for continuity to ground: There should be continuity. Poor ground (G501) An open in the wire A24 Fuse/relay box socket Ignition switch ON (II) Check for voltage to ground: There should be battery voltage. Blown No. 9 (10 A) fuse in the driver's under-dash fuse/relay box Faulty driver's fuse/relay box A12 Fuse/relay box socket Under all conditions Check for voltage to ground: There should be battery voltage. Blown No. 54 (40 A) fuse in the under-hood fuse/relay box Blown No. 13 (7.5 A) fuse in the passenger's under-dash fuse/relay box An open in the wire A3 Fuse/relay box socket Shift lever in P position Check for continuity to ground: There should be continuity. Poor ground (G101, G102) Faulty transmission range switch Faulty driver's fuse/relay box An open in the wire B14 BLU/WHT Under all conditions Check for continuity between the B14 terminal and the PCM 56P connector B terminal No. 26 (1) (disconnected): There should be continuity. An open in the wire Check for continuity between the B14 terminal and body ground: There should be no continuity. Short in the wire (1) For PCM connector terminal locations (see «PCM INPUTS AND OUTPUTS AT CONNECTOR A»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
4. Reconnect the driver's multiplex control unit to the driver's under-dash fuse/relay box, turn the ignition switch ON (II) to keep the system awake, and make these input tests at the appropriate connectors on the driver's under-dash fuse/relay box. 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 1 in «PASSENGER'S UNIT»(/acura/mdx/i-2000-2006/remont/memory-modules/#driving-position-memory-systems-dpms) . CONTROL UNIT INPUT TEST (DRIVER'S UNIT - 2 OF 2) Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained E3 GRN/ORN Driver's door open Check for voltage to ground: There should be less than 1 V. Faulty driver's door switch An open in the wire Driver's door closed Check for voltage to ground: There should be 5 V or more. Faulty driver's door switch Short to ground in the wire

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1. Remove the passenger's multiplex control unit from the passenger's under-dash fuse/relay box, and disconnect its connector.
2. Inspect all 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 3.
3. With the connectors still disconnected, make 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 4. CONTROL UNIT INPUT TEST (PASSENGER'S UNIT - 1 OF 2) Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained A8 Fuse/relay box socket Under all conditions Check for continuity to ground: There should be continuity. Poor ground (G651) Faulty passenger's fuse/relay box An open in the wire B22 BLK Under all conditions Check for continuity to ground: There should be continuity. Poor ground (G503) An open in the wire A2 Fuse/relay box socket Under all conditions Check for voltage to ground: There should be battery voltage. Blown No. 55 (40 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 fuse/relay box A22 Fuse/relay box socket Ignition switch ON (II) Check for voltage to ground: There should be battery voltage. Blown No. 9 (10 A) fuse in the driver's under-dash fuse/relay box An open in the wire A24 Fuse/relay box socket Under all conditions Check for voltage to ground: There should be battery voltage. Blown No. 54 (40 A) fuse in the under-hood fuse/relay box Blown No. 13 (7.5 A) fuse in the passenger's under-dash fuse/relay box Faulty passenger's fuse/relay box B13 B12 YEL/WHT LT GRN Connect battery power to B13 terminal, and B12 terminal to B22 terminal momentarily. Check right power mirror actuator operation: The mirror should swing left. Faulty right power mirror actuator An open in the wire B13 B14 YEL/WHT BLU/WHT Connect battery power to B13 terminal, and B14 terminal to B22 terminal momentarily. Check right power mirror actuator operation: The mirror should tilt down. Faulty right power mirror actuator An open in the wire B16 B15 BLU/GRN BLU/ORN Connect battery power to B16 terminal, and B15 terminal to B22 terminal momentarily. Check left power mirror actuator operation: The mirror should swing left. Faulty left power mirror actuator An open in the wire B16 B17 BLU/GRN BRN Connect battery power to B16 terminal, and B17 terminal to B22 terminal momentarily. Check left power mirror actuator operation: The mirror should swing left. Faulty left power mirror actuator An open in the wire
4. Reconnect the passenger's multiplex control unit to the passenger's under-dash fuse/relay box, and make these input tests at the appropriate connectors on the passenger's under-dash fuse/relay box. 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 5. CONTROL UNIT INPUT TEST (PASSSENGER'S UNIT - 2 OF 2) Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained B5 BLU/BLK Ignition switch ON (II) and power mirror selector switch to right mirror, then press the power mirror switch "Right". Check for voltage to ground: There should be battery voltage. Blown No. 4 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty power mirror switch An open in the wire B3 PUR Ignition switch ON (II) and power mirror selector switch to right mirror, then press the power mirror switch "Left" or "Down". Check for voltage to ground: There should be battery voltage. Blown No. 4 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty power mirror switch An open in the wire B2 RED/WHT Ignition switch ON (II) and power mirror switch "UP". Check for voltage to ground: There should be battery voltage. Blown No. 4 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty power mirror switch An open in the wire B6 BLU/RED Ignition switch ON (II) and power mirror selector switch to left mirror, then press the power mirror switch "Right". Check for voltage to ground: There should be battery voltage. Blown No. 4 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty power mirror switch An open in the wire B4 ORN/WHT (1) (PNK/BLU (2) ) Ignition switch ON (II) and power mirror selector switch to left mirror, then press the power mirror switch "Left" or "Down". Check for voltage to ground: There should be battery voltage. Blown No. 4 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty power mirror switch An open in the wire B8 B19 RED/BLK BRN/WHT Ignition switch ON (II) Check for voltage between the terminals: There should be about 5 V. Faulty power mirror position sensor A short to ground B7 B19 GRN BRN/WHT Ignition switch ON (II) Check for voltage between the terminals: The voltage should change from about 1 V to 3 V when the right mirror swings from left to right. Faulty right power mirror position sensor An open in the wire B10 B19 GRN/RED BRN/WHT Ignition switch ON (II) Check for voltage between the terminals: The voltage should change from about 1 V to 3 V when the right mirror tilts from up to down. Faulty right power mirror position sensor An open in the wire B18 B19 GRN/WHT BRN/WHT Ignition switch ON (II) Check for voltage between the terminals: The voltage should change from about 1 V to 3 V when the left mirror swings from left to right. Faulty left power mirror position sensor An open in the wire B20 B19 GRY BRN/WHT Ignition switch ON (II) Check for voltage between the terminals: The voltage should change from about 1 V to 3 V when the left mirror tilts from up to down. Faulty left power mirror position sensor An open in the wire (1) '03 Model (2) '04-'06 Models
5. If all the input tests prove OK, one of the control units must be faulty, substitute a known-good control unit for the one that is most likely at fault, then recheck the system. If the system works properly, the original control unit is faulty; replace it. If there is still a malfunction, substitute a known-good control unit for the next most likely unit to be at fault, and recheck. If the system works properly, the original unit is faulty; replace it.

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1. Remove the driver's power seat mounting bolts (see «FRONT SEAT REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/seats/#seats__front-seat-removalinstallation) ). NOTE: Be careful not to scratch the interior trim.
2. Disconnect the connectors from the driver's power seat control unit (A). NOTE: Turning the ignition switch ON (II) when the power seat connectors are disconnected may set SRS codes.
3. 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 4.
4. With the power seat control unit connectors still disconnected, make 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 5. DRIVER'S POWER SEAT CONTROL UNIT INPUT TEST (1 OF 2) Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained A20 B7 D1 BLK Under all conditions Check for continuity to ground: There should be continuity. Poor ground (G631) An open in the wire A9 BLK/YEL Ignition switch ON (II) Check for voltage to ground: There should be battery voltage. Blown No. 9 (10 A) fuse in the driver's under-dash fuse/relay box An open in the wire A10 WHT/YEL Under all conditions Check for voltage to ground: There should be battery voltage. Blown No. 54 (40 A) fuse in the under-hood fuse/relay box Blown No. 13 (7.5 A) fuse in the passenger's under-dash fuse/relay box An open in the wire B3 BLU Under all conditions Check for voltage to ground: There should be battery voltage. Blown No. 55 (40 A) fuse in the under-hood fuse/relay box Blown No. 4 (20 A) fuse in the passenger's under-dash fuse/relay box An open in the wire D4 RED Under all conditions Check for voltage to ground: There should be battery voltage. Blown No. 55 (40 A) fuse in the under-hood fuse/relay box Blown No. 2 (20 A) fuse in the passenger's under-dash fuse/relay box An open in the wire B2 RED/GRN Under all conditions Attach to ground: The driving position memory switch indicator 1 should come on. Blown No. 13 (7.5 A) fuse in the passenger's under-dash fuse/relay box Faulty LED Faulty driving position memory switch An open in the wire B6 RED Under all conditions Attach to ground: The driving position memory switch indicator 2 should come on. A3 BLU/WHT Under all conditions Check for continuity between the A3 terminal and PCM 56P connector B terminal No. 26 (disconnected) (1) : There should be continuity. An open in the wire Check for continuity between the A3 terminal and body ground: There should be no continuity. Short in the wire A19 BLU/YEL Push the position button 2 Check for continuity to ground: There should be continuity. There should be no continuity with the button released. Faulty driving position memory switch Poor ground (G401) An open in the wire A8 BLU/GRN Push the position button 1 Check for continuity to ground: There should be continuity. There should be no continuity with the button released. Faulty driving position memory switch Poor ground (G401) An open in the wire C10 YEL/WHT Push the MEMO button Check for continuity to ground: There should be continuity. There should be no continuity with the button released. Faulty driving position memory switch Poor ground (G401) An open in the wire (1) For the PCM connector terminal locations (see «PCM INPUTS AND OUTPUTS AT CONNECTOR A»(/acura/mdx/i-2000-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
5. Reconnect the connectors to the driver's power seat control unit, turn the ignition switch ON (II) to keep the system awake, and make 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. Substitute with a known-good control unit and recheck. NOTE: All connector views are from wire side of female terminals. DRIVER'S POWER SEAT CONTROL UNIT INPUT TEST (2 OF 2) Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained A18 GRN/ORN Driver's door open Check for voltage to ground: There should be less than 1 V. Faulty driver's door switch An open in the wire Driver's door closed Check for voltage to ground: There should be 5 V or more. Faulty driver's door switch A short in the wire A2 BLU/BLK With slide motor running Check for voltage to ground: There should be 0 V to about 5 V alternately. Faulty slide position sensor An open in the wire A short to ground A12 GRN/BLK With front up-down motor running Check for voltage to ground: There should be 0 V to about 5 V alternately. Faulty front up-down position sensor An open in the wire A short to ground C5 YEL/BLK With recline motor running Check for voltage to ground: There should be 0 V to about 5 V alternately. Faulty recline position sensor An open in the wire A short to ground C11 RED/BLK With rear up-down motor running Check for voltage to ground: There should be 0 V to about 5 V alternately. Faulty rear up-down position sensor An open in the wire A short to ground A7 BLK/BLU Ignition switch ON (II), shift lever in P position Check for voltage to ground: There should be less than 1 V. Poor ground (G101, G102) Faulty transmission range switch An open in the wire A17 WHT Ignition switch ON (II), shift lever in R position Check for voltage to ground: There should be less than 1 V. Poor ground (G101, G102) Faulty transmission range switch An open in the wire A5 A6 RED/BLK YEL/BLK Slide switch in FORWARD position Check for voltage between the A5 and A6 terminals: There should be less than 1 V. Faulty adjustment switch An open in the wire Slide switch is in the neutral position. Check for voltage between the A5 and A6 terminals: There should be more than 5 V. Faulty adjustment switch A5 A16 RED/BLK YEL/RED Slide switch in BACKWARD position Check for voltage between the A5 and A16 terminals: There should be less than 1 V. Faulty adjustment switch An open in the wire Slide switch is in the neutral position. Check for voltage between the A5 and A16 terminals: There should be more than 5 V. Faulty adjustment switch A5 C1 RED/BLK RED/WHT Recline switch in FORWARD position Check for voltage between the A5 and C1 terminals: There should be less than 1 V. Faulty adjustment switch An open in the wire Recline switch is in the neutral position. Check for voltage between the A5 and C1 terminals: There should be more than 5 V. Faulty adjustment switch A5 C7 RED/BLK RED/YEL Recline switch in BACKWARD position Check for voltage between the A5 and C7 terminals: There should be less than 1 V. Faulty adjustment switch An open in the wire Recline switch is in the neutral position. Check for voltage between the A5 and C7 terminals: There should be more than 5 V. Faulty adjustment switch A5 C8 RED/BLK GRN/BLK Front up-down switch in DOWN position Check for voltage between the A5 and C8 terminals: There should be less than 1 V. Faulty adjustment switch An open in the wire Front up-down switch is in the neutral position. Check for voltage between the A5 and C8 terminals: There should be more than 5 V. Faulty adjustment switch A5 C2 RED/BLK GRN/WHT Front up-down switch in UP position Check for voltage between the A5 and C2 terminals: There should be less than 1 V. Faulty adjustment switch An open in the wire Front up-down switch is in the neutral position. Check for voltage between the A5 and C2 terminals: There should be more than 5 V. Faulty adjustment switch A5 C3 RED/BLK BLU/ORN Rear up-down switch in UP position Check for voltage between the A5 and C3 terminals: There should be less than 1 V. Faulty adjustment switch An open in the wire Rear up-down switch is in the neutral position. Check for voltage between the A5 and C3 terminals: There should be more than 5 V. Faulty adjustment switch A5 C9 RED/BLK BLU/RED Rear up-down switch in DOWN position Check for voltage between the A5 and C9 terminals: There should be less than 1 V. Faulty adjustment switch An open in the wire Rear up-down switch is in the neutral position. Check for voltage between the A5 and C9 terminals: There should be more than 5 V. Faulty adjustment switch B1 B5 BLU BLU/YEL Jump B3 terminal to B1 terminal, and B5 terminal to B7 terminal. Reverse the connections to operate the motor in the other direction. Check slide motor operation: The motor should run. Faulty slide motor An open in the wire B4 B8 RED/YEL YEL/GRN Jump B3 terminal to B4 terminal, and B8 terminal to B7 terminal. Reverse the connections to operate the motor in the other direction. Check front up-down motor operation: The motor should run. Faulty front up-down motor An open in the wire D2 D5 GRN/YEL GRN Jump B3 terminal to D2 terminal, and D5 terminal to B7 terminal. Reverse the connections to operate the motor in the other direction. Check rear up-down motor operation: The motor should run. Faulty rear up-down motor An open in the wire D3 D6 YEL/GRN YEL Jump B3 terminal to D3 terminal, and D6 terminal to B7 terminal. Reverse the connections to operate the motor in the other direction. Check recline motor operation: The motor should run. Faulty recline motor An open in the wire

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1. Remove the driver's door panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/windows/#doors__front-door-panel-removalinstallation) ).
2. Disconnect the 10P connector from the driving position memory switch (A).
3. Check for continuity between the terminals in each switch position according to (Scheme 22).
4. If the continuity is not as specified, replace the illumination bulb (B) or the switch.

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1. Raise the driver's power seat up with the power seat up-down switch, then remove the power seat (see «FRONT SEAT REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/seats/#seats__front-seat-removalinstallation) ). NOTE: Be careful no to scratch the interior trim.
2. Disconnect the power seat control unit connectors (see «DRIVER'S POWER SEAT CONTROL UNIT INPUT TEST»(/acura/mdx/i-2000-2006/remont/memory-modules/#driving-position-memory-systems-dpms) ).
3. Disconnect the 4P connector from the slide position sensor.
4. Check for continuity between the No. 2 terminal of the slide position sensor and A11 terminal of the power seat control unit. Is there continuity? YES - Go to step 5. NO - Repair open in the WHT/BLK wire.
5. Check for continuity between the No. 3 terminal of the slide position sensor and A2 terminal of the power seat control unit. Is there continuity? YES - Go to step 6. NO - Repair open in the BLU/BLK wire.
6. Reconnect all connectors to run the seat motors.
7. Turn the ignition switch ON (II).
8. Check for voltage between the No. 4 terminal of the slide position sensor and body ground. Is there about 5 V? YES - Go to step 9. NO - Repair open or short in the BRN wire.
9. Check for voltage pulse between the No. 3 terminal of the slide position sensor and body ground when the slide switch moves forward or backward. Does voltage pulse from 0 to about 5 V alternately? YES - Check for poor connections or loose terminals between the sensor and the driver's power seat control unit. If OK, replace the power seat control unit. NO - Check for a short in the wire. If the wire is OK, the slide position sensor is faulty; replace the slide motor assembly.

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1. Raise the driver's power seat up with the power seat up-down switch, then remove the power seat (see «FRONT SEAT REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/seats/#seats__front-seat-removalinstallation) ). NOTE: Be careful not to scratch the interior trim.
2. Disconnect the power seat control unit connectors (see «DRIVER'S POWER SEAT CONTROL UNIT INPUT TEST»(/acura/mdx/i-2000-2006/remont/memory-modules/#driving-position-memory-systems-dpms) ).
3. Disconnect the 4P connector from the recline position sensor.
4. Check for continuity between the No. 2 terminal of the recline position sensor and C12 terminal of the power seat control unit. Is there continuity? YES - Go to step 5. NO - Repair open in the BRN/BLK wire.
5. Check for continuity between the No. 3 terminal of the recline position sensor and C5 terminal of the power seat control unit. Is there continuity? YES - Go to step 6. NO - Repair open in the YEL/BLK wire.
6. Reconnect all connectors to run the seat motors.
7. Turn the ignition switch ON (II).
8. Check for voltage between the No. 4 terminal of the recline position sensor and body ground. Is there about 5 V? YES - Go to step 9. NO - Repair open or short in the BRN/WHT wire.
9. Check for voltage pulse between the No. 3 terminal of the recline position sensor and body ground when the recline switch moves forward or backward. Does voltage pulse from 0 to about 5 V alternately? YES - Check for poor connections or loose terminals between the sensor and the driver's power seat control unit. If OK, replace the power seat control unit. NO - Check for a short in the wire. If the wire is OK, the recline position sensor is faulty; replace the recline motor assembly.

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1. Raise the driver's power seat up with the power seat up-down switch, then remove the power seat (see «FRONT SEAT REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/seats/#seats__front-seat-removalinstallation) ). NOTE: Be careful not to scratch the indicator trim.
2. Disconnect the power seat control unit connectors (see «DRIVER'S POWER SEAT CONTROL UNIT INPUT TEST»(/acura/mdx/i-2000-2006/remont/memory-modules/#driving-position-memory-systems-dpms) ).
3. Disconnect the 4P connector from the front up-down position sensor.
4. Check for continuity between the No. 2 terminal of the front up-down position sensor and A11 terminal of the power seat control unit. Is there continuity? YES - Go to step 5. NO - Repair open in the WHT/BLK wire.
5. Check for continuity between the No. 3 terminal of the front up-down position sensor and A12 terminal of the power seat control unit. Is there continuity? YES - Go to step 6. NO - Repair open in the GRN/BLK wire.
6. Reconnect all connectors to run the seat motors.
7. Turn the ignition switch ON (II).
8. Check for voltage between the No. 4 terminal of the front up-down position sensor and body ground. Is there about 5 V? YES - Go to step 9. NO - Repair the open or short in the BRN wire.
9. Check for voltage pulse between the No. 3 terminal of the front up-down position sensor and body ground when the front up-down switch moves up and down. Does voltage pulse from 0 to about 5 V alternately? YES - Check poor connections or loose terminals between the sensor and the driver's power seat control unit. If OK, replace the power seat control unit. NO - Check for a short in the wire. If the wire is OK, the front up-down position sensor is faulty; replace the front up-down motor assembly.

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1. Raise the driver's power seat up with the power seat up-down switch, then remove the power seat (see «FRONT SEAT REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/seats/#seats__front-seat-removalinstallation) ). NOTE: Be careful not to scratch the interior trim.
2. Disconnect the power seat control unit connectors (see «DRIVER'S POWER SEAT CONTROL UNIT INPUT TEST»(/acura/mdx/i-2000-2006/remont/memory-modules/#driving-position-memory-systems-dpms) ).
3. Disconnect the 4P connector from the rear up-down position sensor.
4. Check for continuity between the No. 2 terminal of the rear up-down position sensor and C12 terminal of the power seat control unit. Is there continuity? YES - Go to step 5. NO - Repair open in the BRN/BLK wire.
5. Check for continuity between the No. 3 terminal of the rear up-down position sensor and C11 terminal of the power seat control unit. Is there continuity? YES - Go to step 6. NO - Repair open in the RED/BLK wire.
6. Reconnect all connectors to run the seat motors.
7. Turn the ignition switch ON (II).
8. Check for voltage between the No. 4 terminal of the rear up-down position sensor and body ground. Is there about 5 V? YES - Go to step 9. NO - Repair the open or short in the BRN/WHT wire.
9. Check for voltage pulse between the No. 3 terminal of the rear up-down position sensor and body ground when the rear up-down switch moves up and down. Does voltage pulse from 0 to about 5 V alternately? YES - Check for poor connections or loose terminals between the sensor and the driver's power seat control unit. If OK, replace the power seat control unit. NO - Check for a short in the wire. If the wire is OK, the rear up-down position sensor is faulty; replace the rear up-down motor assembly.

Power Mirror Position Sensor Troubleshooting

Note. Before troubleshooting, check the No. 5 (20 A) and No. 13 (7.5 A) in the passenger's under-dash fuse/relay box and the No. 4 (7.5 A) fuse in the driver's under-dash fuse/relay box and test the power mirrors (see FUNCTION TEST ).

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1. Turn the ignition switch ON (II).
2. Check for voltage between the B2 and B22 terminals of the passenger's multiplex control unit with the power mirror switch pressed UP or LEFT. Is there battery voltage? YES - Go to step 3. NO - Repair open in the RED/WHT or BLK wire.
3. Move the selector switch to RIGHT.
4. Check for voltage between the B5 and B22 terminals with the power mirror switch pressed to the RIGHT or DOWN. Is there battery voltage? YES - Go to step 5. NO - Repair open in the BLU/BLK wire.
5. Check for voltage between the B3 and B22 terminals with the power mirror switch pressed to the LEFT or DOWN. Is there battery voltage? YES - Go to step 6. NO - Repair open in the PUR wire.
6. Move the selector switch to the LEFT.
7. Check for voltage between the B6 and B22 terminals with the power mirror switch pressed to the RIGHT or DOWN. Is there battery voltage? YES - Go to step 8. NO - Repair open in the BLU/RED wire.
8. Check for voltage between the B4 and B22 terminals with the power mirror switch pressed to the LEFT or DOWN. Is there battery voltage? YES - Go to step 9. NO - Repair open in the ORN/WHT (PNK/BLU)* wire. *: '04-06 models
9. Turn the ignition switch OFF.
10. Disconnect passenger's multiplex control unit 22P connector B.
11. Apply battery power to the B13 terminal and ground the B12 [or B14] terminal. Does right mirror swing left (or tilt down) ? YES - Go to step 12. NO - Check the power mirror actuator (see «POWER MIRROR ACTUATOR TEST»(/acura/mdx/i-2000-2006/remont/mirrors/#power-mirrors) ). If the mirror is OK, repair the open in the LT GRN or YEL/WHT [or BLU/WHT] wires.
12. Apply battery power to the B16 terminal and ground the B15 [or B17] terminal. Does left mirror swing left or tilt down? YES - Go to step 13. NO - Check the power mirror actuator (see «POWER MIRROR ACTUATOR TEST»(/acura/mdx/i-2000-2006/remont/mirrors/#power-mirrors) ). If the mirror is OK, repair the open in the BLU/ORN or BLU/GRN [or BRN] wires.
13. Reconnect the 22P connector B to the passenger's multiplex control unit.
14. Turn the ignition switch ON (II).
15. Check for voltage between the B8 and B22 terminals. Is there about 5 V? YES - Go to step 16. NO - Repair short in the RED/BLK wire. If the wire is OK, substitute with a known-good the passenger's multiplex control unit and recheck.
16. Check for voltage between the B8 and B19 terminals. Is there about 5 V? YES - Go to step 17. NO - Substitute a known-good passenger's multiplex control unit and recheck.
17. Check for voltage between the B7 and B19 terminals while moving the passenger's mirror from right to left. Does the voltage change from about 3 V to 1 V? YES - Go to step 18. NO - Repair open or short in the GRN wire. If the wire is OK, the right power mirror position sensor is faulty; replace the right power mirror actuator.
18. Check for voltage between the B10 and B19 terminals while moving the passenger's mirror from up to down. Does the voltage change from about 1 V to 3 V? YES - Go to step 19. NO - Repair open or short in the GRN/RED wire. If the wire is OK, the right power mirror position sensor is faulty; replace the right power mirror actuator.
19. Check for voltage between the B18 and B19 terminals while moving the driver's mirror from left to right. Does the voltage change from about 3 V to 1 V? YES - Go to step 20. NO - Repair open or short in the GRN/WHT wire. If the wire is OK, the left power mirror position sensor is faulty; replace the left power mirror actuator.
20. Check for voltage between the B20 and B19 terminals while moving the driver's mirror from up to down. Does the voltage change from about 1 V to 3V? YES - Substitute a known good passenger's multiplex control unit, and recheck. If the systems now work OK, replace the original passenger's unit. NO - Repair open or short in the GRY wire. If the wire is OK, the left power mirror position sensor is faulty; replace the left power mirror actuator.

See also:
• SYSTEM DESCRIPTION
• TRANSMITTER TEST
• PCM IDLE LEARN PROCEDURE
• RESETTING THE POWER WINDOW CONTROL UNIT
• DRIVER'S SWITCH ('03 MODEL, '04-06 MODELS WITHOUT DPMS)
• TRANSMISSION RANGE SWITCH TEST
• DTC P0721: PROBLEM IN OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR CIRCUIT
• VEHICLE SPEED SIGNAL CIRCUIT TROUBLESHOOTING
• TROUBLESHOOTING
• PCM INPUTS AND OUTPUTS AT CONNECTOR A
• FRONT SEAT REMOVAL/INSTALLATION
• FRONT DOOR PANEL REMOVAL/INSTALLATION
• FUNCTION TEST
• DRIVER'S POWER SEAT CONTROL UNIT INPUT TEST
• CONTROL UNIT INPUT TEST