Control Unit Input Test/Replacement

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 the power tailgate control unit, troubleshoot the multiplex integrated control system first using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Turn the ignition switch to LOCK (0).
Remove the left rear side trim panel (see TRIM REMOVAL/INSTALLATION - REAR SIDE AREA ).
Disconnect power tailgate control unit connectors A (5P), B (20P), and C (14P).

Fig 1: Power Tailgate Control Unit With Torque Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Inspect all 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.

Reconnect all connectors to the power tailgate control unit, and do the following input tests:

If the test indicates a problem, find and correct the cause, then recheck the system.
If the input test proves OK, the control unit must be faulty; replace it.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
A2	BRN	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 11 (40 A) fuse in the rear fuse/relay box Blown No. 3 (60 A) fuse in the main under-hood fuse box Faulty rear fuse/relay box Faulty main under-hood fuse box An open or high resistance in the wire
B12	PNK	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 6 (20 A) fuse in the rear fuse/relay box Blown No. 3 (60 A) fuse in the main under-hood fuse box Faulty rear fuse/relay box Faulty main under-hood fuse box An open or high resistance in the wire
B10	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 7 (10 A) fuse in the under-dash fuse/relay box Blown No. 4(40 A) fuse in the main under-hood fuse box Faulty under-dash fuse/relay box Faulty main under-hood fuse box An open or high resistance in the wire
C14	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 or high resistance in the wire
A1	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground(G701, G702) or an open in the ground wire An open or high resistance in the wire
A4
B19
B8	GRN	Shift lever in P position	Measure the voltage to ground: There should be less than 0.2 V.	Faulty transmission range switch Poor ground (G101) or an open in the ground wire An open or high resistance in the wire

Reset the power tailgate control unit (see RESETTING THE POWER TAILGATE CONTROL UNIT ).