MICU Input Test
WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A
- Turn the ignition switch to LOCK (0).
- Remove the left kick panel (see TRIM REMOVAL/INSTALLATION - DOOR AREAS ).
- Disconnect under-dash fuse/relay box connectors D, E, F, G, H, J, N, P, Q, and X.NOTE: All connector views are wire side of female terminals.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
*: Connector view shown rotated 180° from actual position in the under-dash fuse/relay box.
- 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.
- With the connectors still disconnected, do the following input tests:
- 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.
Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained D11 LT GRN Under all conditions (Under-hood fuse/relay box connector E (14P) disconnected) Check for continuity between terminal D11 and under-hood fuse/relay box connector E (14P) terminal No. 1:
There should be continuity.An open or high resistance in the wire Check for continuity to ground:
There should be no continuity.A short to ground in the wire G1 LT GRN Under all conditions (Rear fuse/relay box connector B (34P) disconnected) Check for continuity between terminal G1 and rear fuse/relay box connector B (34P) terminal No. 2:
There should be continuity.An open or high resistance in the wire Check for continuity to ground:
There should be no continuity.A short to ground in the wire J4 LT GRN Under all conditions (Driver's MPCS unit connector A (40P) disconnected) Check for continuity between terminal J4 and driver's MPCS unit connector A (40P) terminal No. 28:
There should be continuity.An open or high resistance in the wire Check for continuity to ground:
There should be no continuity.A short to ground in the wire P6 ORN Under all conditions Check for continuity between terminal P6 and DLC terminal No. 7:
There should be continuity.An open or high resistance in the wire Check for continuity to ground:
There should be no continuity.A short to ground in the wire N22 LT GRN Under all conditions (Gauge control module connector A (12P) disconnected) Check for continuity between terminal N22 and gauge control module connector A (12P) terminal No. 5:
There should be continuity.An open or high resistance in the wire Check for continuity to ground:
There should be no continuity.A short to ground in the wire X27 LT GRN Under all conditions (Combination switch control unit 8P connector disconnected) Check for continuity between terminal X27 and combination switch control unit 8P connector terminal No. 4:
There should be continuity.An open or high resistance in the wire Check for continuity to ground:
There should be no continuity.A short to ground in the wire N28 LT GRN Under all conditions (Immobilizer-keyless control unit 7P connector disconnected) Check for continuity between terminal N28 and immobilizer-keyless control unit 7P connector terminal No. 4:
There should be continuity.An open or high resistance in the wire N28 LT GRN Under all conditions (Climate control unit connector A (40P) disconnected) Check for continuity between terminal N28 and climate control unit connector A (40P) terminal No. 4:
There should be continuity.An open or high resistance in the wire N28 LT GRN Under all conditions (Audio unit connector C (24P) disconnected) Check for continuity between terminal N28 and audio unit connector C (24P) terminal No. 23:
There should be continuity.An open or high resistance in the wire N28 LT GRN Under all conditions (HandsFreeLink control unit 28P connector disconnected) Check for continuity between terminal N28 and HandsFreeLink control unit 28P connector terminal No. 18:
There should be continuity.An open or high resistance in the wire N28 LT GRN Under all conditions (Audio-navigation unit connector F (20P) disconnected) Check for continuity between terminal N28 and audio-navigation unit connector F (20P) terminal No. 6:
There should be continuity.An open or high resistance in the wire N28 LT GRN Under all conditions (Immobilizer-keyless control unit 7P connector, climate control unit connector A (40P), audio unit connector C (24P), HandsFreeLink control unit 28P connector, and audio-navigation unit connector F (20P) disconnected) Check for continuity to ground:
There should be no continuity.A short to ground in the wire - Reconnect the connectors, and do the following input tests:
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, the MICU must be faulty; replace the under-dash fuse/relay box REMOVAL AND INSTALLATION ).
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired result is not obtained |
|---|---|---|---|---|
| E9 | BLK | In all ignition switch positions | Measure the voltage to ground: There should be less than 0.2 V. |
|
| H9 | ||||
| Q4 | ||||
| P1 | BRN | In all ignition switch positions | Measure the voltage to ground: There should be less than 0.2 V. |
|
| F1 | LT BLU | Ignition switch ON (II) | Measure the voltage to ground: There should be battery voltage. |
|
| G3 | WHT | Under all conditions | Measure the voltage to ground: There should be battery voltage. |
|