Driver's door lock knob switch circuit troubleshooting

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.

Turn the ignition switch to ON (II).
With the driver's door lock knob switch in LOCK position, select SECURITY with the HDS, and enter the DATA LIST.
Check the ON/OFF information of the DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK) in the DATA LIST.
Is information indicator ON?

YES -Go to step 4.

NO -Go to step 8.
Disconnect the driver's door latch 10P connector.
Check the ON/OFF information of the DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK) in the DATA LIST.
Is information indicator OFF?

YES -Faulty driver's door lock knob switch; replace the driver's door latch (see FRONT DOOR LATCH REPLACEMENT ).

NO -Go to step 6.
Disconnect driver's MPCS unit connector A (40P).
Check for continuity between driver's MPCS unit connector A (40P) terminal No. 1 and body ground.

Fig 1: Checking For Continuity Between Connector A (40P) Terminal No. 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair a short to ground in the wire.

NO -Replace the driver's MPCS unit (see DRIVER'S MPCS UNIT INPUT TEST ).
Disconnect the driver's door latch 10P connector.
Connect driver's door latch 10P connector terminal No. 7 and body ground with a jumper wire.

Fig 2: Connecting 10P Connector Terminal No. 7 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check the ON/OFF information of the DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK) in the DATA LIST.
Is information indicator ON?

YES -Go to step 11.

NO -Go to step 12.
Check for continuity between driver's door latch 10P connector terminal No. 5 and body ground.

Fig 3: Checking For Continuity Between 10P Connector Terminal No. 5 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Faulty driver's door lock knob switch; replace the driver's door latch (see FRONT DOOR LATCH REPLACEMENT ).

NO -Repair an open or high resistance in the ground wire or poor ground (G601).
Connect driver's MPCS unit connector A (40P) terminal No. 1 and body ground with a jumper wire.

Fig 4: Connecting Connector A (40P) Terminal No. 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check the ON/OFF information of the DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK) in the DATA LIST.
Is information indicator ON?

YES -Repair an open or high resistance in the wire.

NO -Replace the driver's MPCS unit (see DRIVER'S MPCS UNIT INPUT TEST ).