Entry Lights Control System Acura MDX I

Scheme 31

Scheme 32

Ignition Key Switch Test

Note. For more key-in beeper information, refer to the following: '03 model: - Circuit diagram (see '03 MODEL ) - Input test (see CONTROL UNIT INPUT TEST ) '04-06 models: - Circuit diagram (see '04-'06 MODELS ) - Input test (see GAUGE INPUT TEST and CONTROL UNIT INPUT TEST )

When the ignition key is in the ignition switch, the key-in beeper in the driver's multiplex control unit senses ground through the closed ignition key switch. When you open the driver's door, the beeper circuit senses ground through the closed door switch.

Scheme 33

1. Remove the steering column upper and lower covers (see «STEERING COLUMN REMOVAL AND INSTALLATION»(/acura/mdx/i-2000-2006/remont/manual-power-steering/#power-steering-system__steering-column-removal-and-installation) ).
2. Disconnect the 7P connector.
3. Check for continuity between the No. 1 and No. 3 terminals. There should be continuity with the key in the ignition switch. There should be no continuity with the key removed.
4. If the continuity is not as specified, replace the ignition key switch.

Scheme 34

1. Remove the steering column upper and lower covers (see «STEERING COLUMN REMOVAL AND INSTALLATION»(/acura/mdx/i-2000-2006/remont/manual-power-steering/#power-steering-system__steering-column-removal-and-installation) ).
2. Disconnect the 7P connector.
3. The LED should come on when power is connected to the No. 7 terminal and ground is connected to No. 6 terminal.
4. If the LED does not come on, replace the ignition key switch.

Control Unit Input Test

1. Before testing the entry light control functions, troubleshoot the multiplex control system (see «TROUBLESHOOTING»(/acura/mdx/i-2000-2006/remont/communication-devices/#multiplex-control-system__troubleshooting) ).

Scheme 35

Scheme 36

Scheme 37

1. Remove the driver's multiplex control unit from the driver's under-dash fuse/relay box.
2. 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 3.
3. With the driver's multiplex control unit still disconnected, make these input tests at the connector or driver's under-dash fuse/relay box socket. 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. Test condition and Test Desired result chart Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained A1 Fuse/relay box socket Under all conditions Attach to ground: The ignition key light should come on. Blown No. 47 (20 A) fuse in the under-hood fuse/relay box Faulty LED An open in the wire A24 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 under-dash fuse/relay box A6 Combination light switch ON Check for voltage to ground: There should be battery voltage. Blown No. 54 (10 A) fuse in the under-hood fuse/relay box Blown No. 10 (15 A) fuse in the passenger's under-dash fuse/relay box Faulty taillight relay Faulty combination light switch An open in the wire
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 perform the following input tests at the appropriate connectors on the back of the driver's under-dash fuse/relay box. For driver's under-dash fuse/relay box connector socket location (see «DRIVER'S UNDER-DASH FUSE/RELAY BOX»(/acura/mdx/i-2000-2006/remont/body-electrical/#fuserelay-boxes__drivers-under-dash-fuserelay-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 MULTIPLEX CONTROL UNIT»(/acura/mdx/i-2000-2006/remont/interiorillumination-lights/#entry-lights-control-system) . TEST CONDITION AND TEST DESIRED RESULT CHART 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 A short to ground Driver's door closed Check for voltage to ground: There should be 5 V or more. M3 RED/BLK Combination light switch ON 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. 10 (15 A) fuse in the passenger's under-dash fuse/relay box Faulty taillight relay Faulty combination light switch An open in the wire M9 BLU/WHT Ignition key is in the ignition switch Check for voltage to ground: There should be less than 1 V. Poor ground (G401) Faulty ignition switch An open in the wire A short to ground Ignition key is out of the ignition switch Check for voltage to ground: There should be 5 V or more. E10 LT GRN/ BLK Left rear door open Check for voltage to ground: There should be less than 1 V. Faulty left rear door switch An open in the wire A short to ground Left rear door closed Check for voltage to ground: There should be 5 V or more.

Scheme 38

Scheme 39

1. Remove the passenger's multiplex control unit from the passenger's under-dash fuse/relay box, and disconnect its connector.
2. 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 3.
3. With the passenger's multiplex control unit still disconnected, make these input tests at the connector and passenger's under-dash fuse/relay box socket. 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. TEST CONDITION AND TEST DESIRED RESULT CHART Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained 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 Faulty passenger's under-dash fuse/relay box An open in the wire A21 Interior light switch in the middle position Attach to ground: Ceiling lights should come on. Blown No. 11 (10 A) fuse in the passenger's under-dash fuse/relay box Blown No. 54 (40 A) fuse in the under-hood fuse/relay box Faulty passenger's under-dash fuse/relay box Faulty ceiling light Faulty interior lights switch An open in the wire
4. Reconnect the passenger's multiplex control unit to the passenger's under-dash fuse/relay box, turn the ignition switch ON (II) to keep the system awake, and perform the following input tests at the appropriate connectors on the back of the passenger's under-dash fuse/relay box. If a test indicates a problem, find and correct the cause, then recheck the system. If the input test proves OK, go to step 1 in «DOOR MULTIPLEX CONTROL UNIT»(/acura/mdx/i-2000-2006/remont/interiorillumination-lights/#entry-lights-control-system) . TEST CONDITION AND TEST DESIRED RESULT CHART Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained C16 GRN Passenger's door open Check for voltage to ground: There should be less than 1 V. Faulty passenger's door switch An open in the wire Passenger's door closed Check for voltage to ground: There should be 5 V or more. Faulty passenger's door switch A short to ground in the wire C14 GRN/WHT Right rear door open Check for voltage to ground: There should be less than 1 V. Faulty right rear door switch An open in the wire Right rear door closed Check for voltage to ground: There should be 5 V or more. Faulty right rear door switch A short to ground in the wire

Scheme 40

1. Remove the driver's door panel and disconnect the 20P connector from the door multiplex control unit.
2. 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 3.
3. Reconnect the connector to the door multiplex control unit, turn the ignition switch ON (II) to keep the system awake, and perform the input test at the connector. If a test indicates a problem, find and correct the cause, then recheck the system. If the input test proves OK, go to step 4. TEST CONDITION AND TEST DESIRED RESULT CHART Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained A17 BLK/RED Driver's door lock knob unlocked Check for voltage to ground: There should be less than 1 V. Faulty driver's door lock actuator Poor ground (G401) An open in the wire Driver's door lock knob locked Check for voltage to ground: There should be 5 V or more. Faulty driver's door lock actuator Short to ground
4. 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.

See also:
• '03 MODEL
• GAUGE INPUT TEST
• STEERING COLUMN REMOVAL AND INSTALLATION
• TROUBLESHOOTING
• DRIVER'S UNDER-DASH FUSE/RELAY BOX
• PASSENGER'S MULTIPLEX CONTROL UNIT