Power Seat Control Unit 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:

SRS components are located in this area. Review the SRS component locations (see COMPONENT LOCATION INDEX ), and precautions and procedures (see PRECAUTIONS AND PROCEDURES ) before doing repairs or servicing.
Before troubleshooting the DPMS, 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 driver's seat (see FRONT SEAT REMOVAL/INSTALLATION ).
NOTE: Be careful not to scratch the interior trim.
Disconnect 40P connector (A) and 18P connector (B) from the power seat control unit (C).

Fig 1: Identifying 40P Connector And 18P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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 test:

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
A37	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

Reconnect the connectors to the power seat control unit, 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 control unit must be faulty; replace it.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
A9	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G602) or an open in the ground wire An open or high resistance in the wire
B4	BLK
B18	BLK
A35	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
B1	LT BLU	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 2 (OP2) (40 A) fuse in the main under-hood fuse box Blown No. 16 (20 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box Faulty main under-hood fuse box An open or high resistance in the wire
B8	ORN	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 2 (OP2) (40 A) fuse in the main under-hood fuse box Blown No. 14 (20 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box Faulty main under-hood fuse box An open or high resistance in the wire
A31	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 or high resistance in the wire
A31	GRN	Shift lever out of P position	Measure the voltage to ground: There should be about 10 V.	A short to ground in the wire
A1 . A7	BLU . GRY	Side switch in FORWARD position	Measure the voltage between the terminals: There should be less then 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
A1 . A27	BLU . LT GRN	Side switch in BACKWARD position	Measure the voltage between the terminals: There should be less then 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
A1 . A6	BLU . LT BLU	Recline switch in FORWARD position	Measure the voltage between the terminals: There should be less then 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
A1 . A25	BLU . GRN	Recline switch in BACKWARD position	Measure the voltage between the terminals: There should be less then 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
A1 . A5	BLU . ORN	Front up-down switch in UP position	Measure the voltage between the terminals: There should be less then 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
A1 . A4	BLU . RED	Front up-down switch in DOWN position	Measure the voltage between the terminals: There should be less then 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
A1 . A23	BLU . PNK	Rear up-down switch in UP position	Measure the voltage between the terminals: There should be less then 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
A1 . A3	BLU . WHT	Rear up-down switch in DOWN position	Measure the voltage between the terminals: There should be less then 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire