Entry Lights Control System Acura MDX II

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Control Unit Input Test

Note. Before testing the entry lights control system, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

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Scheme 25

1. Turn the ignition switch to LOCK (0), and remove the left kick panel (see «FRONT DOOR SILL AREA»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#interior-trim__front-door-sill-area) ).
2. Disconnect under-dash fuse/relay box connectors E, F, G, H, P, Q, and W. NOTE: All connector views are wire side of female terminals.
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. Reconnect the connectors, turn the ignition switch ON (II), 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, go to step 5. CAVITY AND TEST CONDITION CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained E9 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G601) An open in the wire H9 Q4 P1 BRN Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G502) An open in the wire P13 PNK Ignition key inserted into the ignition switch Measure the voltage to ground: There should be less than 1 V. Faulty ignition key switch An open in the wire Ignition switch LOCK (0) and the ignition key removed from the ignition switch Measure the voltage to ground: There should be more than 5 V. Faulty ignition key switch A short to ground in the wire E15 GRN Driver's door open Measure the voltage to ground: There should be less than 1 V. Faulty driver's door switch An open in the wire Driver's door closed Measure the voltage to ground: There should be more than 5 V. Faulty driver's door switch A short to ground in the wire H12 LT GRN Front passenger's door open Measure the voltage to ground: There should be less than 1 V. Faulty front passenger's door switch An open in the wire Front passenger's door closed Measure the voltage to ground: There should be more than 5 V. Faulty front passenger's door switch A short to ground in the wire Q2 GRY Right rear door open Measure the voltage to ground: There should be less than 1 V. Faulty right rear door switch An open in the wire Right rear door closed Measure the voltage to ground: There should be more than 5 V. Faulty right rear door switch A short to ground in the wire Q8 GRN Left rear door open Measure the voltage to ground: There should be less than 1 V. Faulty left rear door switch An open in the wire Left rear door closed Measure the voltage to ground: There should be more than 5 V. Faulty left rear door switch A short to ground in the wire F14 ORN Under all conditions Attach to ground: The ignition key light should come on. Blown No. 4 (40 A) fuse in the main under-hood fuse box Blown No. 6 (7.5 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box Faulty ignition key light An open in the wire W4 LT GRN Under all conditions (Interior lights switch in DOOR position) Attach to ground: The map and ceiling lights should come on. Blown No. 4 (40 A) fuse in the main under-hood fuse box Blown No. 6 (7.5 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box Blown map lights or ceiling light bulb(s) An open in the wire Rear Fuse/Relay Box
5. Turn the ignition switch to LOCK (0).
6. Remove the left rear trim (see «TRIM REMOVAL/INSTALLATION - REAR SIDE AREA»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-rear-side-area) ).
7. Disconnect rear fuse/relay box connector B (34P) and C (42P).
8. 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 9.
9. Reconnect the connectors, then turn the ignition switch ON (II), 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, go to step 10. CAVITY AND TEST CONDITION CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained B18 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G603, G604) An open in the wire B29 B4 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 Blown No. 7 (10 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open in the wire B23 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 in the wire C6 (1) LT GRN Tailgate open Measure the voltage to ground: There should be less than 1 V. Poor ground (G702) Faulty tailgate latch switch An open in the wire Tailgate closed Measure the voltage to ground: There should be more than 5 V. Faulty tailgate latch switch A short to ground in the wire (1) Without power tailgate Driver's MPCS Unit
10. Turn the ignition switch to LOCK (0).
11. Remove the driver's door panel (see «FRONT DOOR PANEL REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exterior-body-panels/#doors__front-door-panel-removalinstallation) ).
12. Disconnect driver's MPCS unit connectors A (40P) and B (UP).
13. 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 14.
14. 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 15. CAVITY AND TEST CONDITION CHART Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained A23 * A27 PNK * BRN Driver's door lock switch in LOCK Check for continuity: There should be continuity. Faulty driver's door lock switch An open in the wire Driver's door lock switch in neutral or UNLOCK Check for continuity: There should be no continuity. Faulty driver's door lock switch A short to ground in the wire A24 * A27 RED * BRN Driver's door lock switch in UNLOCK Check for continuity: There should be continuity. Faulty driver's door lock switch An open in the wire Driver's door lock switch in neutral or LOCK Check for continuity: There should be no continuity. Faulty driver's door lock switch A short to ground in the wire
15. Reconnect the connectors, 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, go to step 16. CAVITY AND TEST CONDITION CHART 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 0.5 V. Poor ground (G601) An open in the wire 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 Blown No. 7 (10 A) fuse in the under-dash fuse/relay box Faulty 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 (7.5 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open in the wire
16. If multiple failures are found on more than one control unit, replace the under-dash fuse/relay box (includes the MICU) (see «REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/body-electrical/#under-dash-fuserelay-box__removal-and-installation) ). If input failures are related to a particular control unit, replace the control unit.

Scheme 26

1. Remove the steering column upper and lower covers (see «COLUMN COVER REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#dashboard__column-cover-removalinstallation) ).
2. Disconnect the 6P connector (A).
3. Check for continuity between the No. 1 and No. 2 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 switch.

Scheme 27

1. Remove the steering column upper and lower covers (see «COLUMN COVER REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#dashboard__column-cover-removalinstallation) ).
2. Disconnect the 6P connector (A).
3. The LED (B) should come on when power is connected to the No. 6 terminal and ground is connected to No. 5 terminal.
4. If the LED does not come on, replace the ignition switch.

See also:
• TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A
• FRONT DOOR SILL AREA
• TRIM REMOVAL/INSTALLATION - REAR SIDE AREA
• FRONT DOOR PANEL REMOVAL/INSTALLATION
• REMOVAL AND INSTALLATION
• COLUMN COVER REMOVAL/INSTALLATION