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Power Mirror Position Sensors

NOTE: Before testing power mirror position sensors, ensure that power mirror system is working properly. See POWER MIRRORS - 3.2CL article. If mirrors are not working, check fuse No. 4 (7.5-amp) in driver's underdash fuse/relay block. Also check power mirror switch and power mirror motors. See POWER MIRROR MOTOR  and POWER MIRROR SWITCH  under COMPONENT TESTS.
  1. Locate passenger's multiplex control unit mounted on passenger's fuse/relay block. If necessary, leaving connectors attached, unbolt and pull fuse/relay block down to gain access to connector "B" of passenger's multiplex control unit. See Figure . Turn ignition on.
  2. Using DVOM to backprobe, measure voltage between passenger's multiplex control unit connector terminals B2 (Red/White wire) and B22 (Black wire) while holding mirror switch UP. If battery voltage exists, go to next step. If battery voltage does not exist, repair open circuit in Red/White wire between passenger's multiplex control unit and power mirror switch, or in Black wire between passenger's multiplex control unit and ground. See WIRING DIAGRAMS  .
  3. Move power mirror selector switch to RIGHT mirror. Backprobing, measure voltage between passenger's multiplex control unit connector terminals B5 (Blue/Black wire) and B22 (Black wire) while holding mirror switch to RIGHT position. See Figure . If battery voltage exists, go to next step. If battery voltage does not exist, repair open circuit in Blue/Black wire between passenger's multiplex control unit and power mirror switch.
  4. Backprobing, measure voltage between passenger's multiplex control unit connector terminals B3 (Purple wire) and B22 (Black wire) while holding mirror switch to LEFT or DOWN position. If battery voltage exists, go to next step. If battery voltage does not exist, repair open circuit in Purple wire between passenger's multiplex control unit and power mirror switch. See WIRING DIAGRAMS  .
  5. Move power mirror selector switch to LEFT mirror. Backprobing, measure voltage between passenger's multiplex control unit connector terminals B6 (Blue/Red wire) and B22 (Black wire) while holding mirror switch to RIGHT or DOWN position. See Figure . If battery voltage exists, go to next step. If battery voltage does not exist, repair open circuit in Blue/Red wire between passenger's multiplex control unit and power mirror switch.
  6. Backprobing, measure voltage between passenger's multiplex control unit connector terminals B4 (Orange wire) and B22 (Black wire) while holding mirror switch to LEFT or DOWN position. If battery voltage exists, go to next step. If battery voltage does not exist, repair open circuit in Orange wire between passenger's multiplex control unit and power mirror switch.
  7. Turn ignition off. Disconnect passenger's multiplex control unit connector "B". Using fused jumper wires, apply battery voltage to passenger's multiplex control unit harness connector terminal B13 (Yellow/White wire) and ground to terminal B12 (Light Green wire) or B14 (Blue/White wire). See Figure . If right mirror moves left (B12) or down (B14), go to next step. If right mirror does not move as specified, check power mirror motor operation. See POWER MIRROR MOTOR  under COMPONENT TESTS. If power mirror motor is okay, repair open circuit in Light Green or Blue/White wire. See WIRING DIAGRAMS  .
  8. Using fused jumper wires, apply battery voltage to passenger's multiplex control unit harness connector terminal B16 (Blue/Green wire) and ground to terminal B15 (Blue/Orange wire) or B17 (Brown wire). If left mirror moves left (B15) or down (B17), go to next step. If left mirror does not move as specified, check power mirror motor operation. See POWER MIRROR MOTOR  under COMPONENT TESTS. If power mirror motor is okay, repair open circuit in Blue/Green, Blue/Orange or Brown wire. See WIRING DIAGRAMS  .
  9. Reconnect passenger's multiplex control unit connector "B". Turn ignition on. Backprobing, measure voltage between passenger's multiplex control unit connector terminals B8 (Red/Black wire) and B22 (Black wire). See Figure . If about 5 volts exist, go to next step. If about 5 volts does not exist, repair open or short circuit in Red/Black wire between passenger's multiplex control unit and mirrors. If Red/Black wire is okay, replace passenger's multiplex control unit.
  10. Backprobing, measure voltage between passenger's multiplex control unit connector terminals B8 (Red/Black wire) and B19 (Brown/White wire). If about 5 volts exist, go to next step. If about 5 volts does not exist, repair open or short circuit in Brown/White wire between passenger's multiplex control unit and mirrors. See WIRING DIAGRAMS  . If Brown/White wire is okay, power mirror position sensor is defective. Replace power mirror motor. See POWER MIRROR MOTOR  under REMOVAL & INSTALLATION.
  11. Backprobing, measure voltage between passenger's multiplex control unit connector terminals B7 (Green wire) and B19 (Brown/White wire) while moving passenger's mirror from right to left. If voltage changes from about 3 volts to about one volt, go to next step. If voltage does not change as specified, repair open or short circuit in Green wire between passenger's multiplex control unit and passenger's mirror. If Green wire is okay, passenger's power mirror position sensor is defective. Replace passenger's power mirror motor. See POWER MIRROR MOTOR  under REMOVAL & INSTALLATION.
  12. Backprobing, measure voltage between passenger's multiplex control unit connector terminals B10 (Green/Red wire) and B19 (Brown/White wire) while moving passenger's mirror from up to down. If voltage changes from about one volt to about 3 volts, go to next step. If voltage does not change as specified, repair open or short circuit in Green/Red wire between passenger's multiplex control unit and passenger's mirror. See WIRING DIAGRAMS  . If Green/Red wire is okay, passenger's power mirror position sensor is defective. Replace passenger's power mirror motor.
  13. Backprobing, measure voltage between passenger's multiplex control unit connector terminals B18 (Green/White wire) and B19 (Brown/White wire) while moving driver's mirror from left to right. If voltage changes from about 3 volts to about one volt, go to next step. If voltage does not change as specified, repair open or short circuit in Green/White wire between passenger's multiplex control unit and driver's mirror. If Green/White wire is okay, driver's power mirror position sensor is defective. Replace driver's power mirror motor. See POWER MIRROR MOTOR  under REMOVAL & INSTALLATION.
  14. Backprobing, measure voltage between passenger's multiplex control unit connector terminals B20 (Gray wire) and B19 (Brown/White wire) while moving driver's mirror from up to down. If voltage changes from about one volt to about 3 volts, substitute known-good passenger's multiplex control unit and retest system. If voltage does not change as specified, repair open or short circuit in Gray wire between passenger's multiplex control unit and driver's mirror. See WIRING DIAGRAMS  . If Gray wire is okay, driver's power mirror position sensor is defective. Replace driver's power mirror motor.
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