Power Seat Control Unit Input Test/Replacement

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 Honda Odyssey, 2016 Honda Odyssey, 2015 Honda Odyssey, 2014 Honda Odyssey, and 2013 Honda Odyssey. 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.
If you are troubleshooting multiple DTCs, be sure to follow the instructions in 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 the 18P connector (A) and 40P connector (B) from the power seat control unit (C).

Fig 1: Identifying 18P Connector, 40P Connector And Power Seat Control Unit
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.

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, go to step 6.

TEST CONDITION CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
B27	GRN	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. C11 (7.5 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
B25	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. B16 (10 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
A8	PNK	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. C32 (20 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
A1	LT BLU	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. C15 (20 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
B12	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G601) An open or high resistance in the ground wire
A5	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G601) An open or high resistance in the ground wire
A9	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground(G601) An open or high resistance in the ground wire
B35	BLU	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
B35	BLU	Shift lever in any other position than P	Measure the voltage to ground: There should be about 5 V.	Faulty transmission range switch A short to ground in the wire
B6	BLU	Run the power seat motors	Measure the voltage to ground: There should be at least about 10 V.	Faulty position sensor Faulty power seat control unit A short to ground in the wire
B11 . B32	GRN . ORN	Run the recline motor	Measure the voltage between terminals B11 (+) and B32 (-): There should be about 2.5 V average.	Faulty position sensor An open or high resistance in the wire A short to ground in the wire
B10 . B32	WHT . ORN	Run the slide motor	Measure the voltage between terminals B10 (+) and B32 (-): There should be about 2.5 V average.	Faulty position sensor An open or high resistance in the wire A short to ground in the wire
B9 . B32	RED . ORN	Run the front up-down motor	Measure the voltage between terminals B9 (+) and B32 (-): There should be about 2.5 V average.	Faulty position sensor An open or high resistance in the wire A short to ground in the wire
B8 . B32	YEL . ORN	Run the rear up-down motor	Measure the voltage between terminals B8 (+) and B32 (-): There should be about 2.5 V average.	Faulty position sensor An open or high resistance in the wire A short to ground in the wire
B20 . B14	BLU . GRY	Slide switch in FORWARD position	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B20 . B37	BLU . LT GRN	Slide switch in BACKWARD position	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B20 . B15	BLU . LT BLU	Recline switch in FORWARD position	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B20 . B38	BLU . GRN	Recline switch in BACKWARD position	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B20 . B16	BLU . ORN	Front up-down switch in UP position	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B20 . B17	BLU . RED	Front up-down switch in DOWN position	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B20 . B39	BLU . PNK	Rear up-down switch in UP position	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B20 . B18	BLU . WHT	Rear up-down switch in DOWN position	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire

Turn the ignition switch to LOCK (0).

Disconnect the connectors from the power seat control unit, and do these 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 power seat control unit must be faulty; replace it.

TEST CONDITION CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
B23	GRY	Disconnect the power mirror control unit 24P connector	Check for continuity between terminal B23 (GRY) and power mirror control unit 24P connector terminal No. 24 (GRY): There should be continuity.	An open in the UART wire
A2 . A10	GRY . BLU	Under all conditions	Connect terminals A8 and A2, and terminals A10 and A9 with jumper wires: The seat should slide backward.	Faulty slide motor An open or high resistance in the wire
A2 . A10	GRY . BLU	Under all conditions	Connect terminals A8 and A10, and terminals A2 and A9 with jumper wires: The seat should slide forward.	Faulty slide motor An open or high resistance in the wire
A18 . A16	YEL . LT GRN	Under all conditions	Connect terminals A8 and A18, and terminals A16 and A9 with jumper wires: The seat should recline forward.	Faulty recline motor An open or high resistance in the wire
A18 . A16	YEL . LT GRN	Under all conditions	Connect terminals A8 and A16, and terminals A18 and A9 with jumper wires: The seat should recline backward.
A3 . A11	BRN . PUR	Under all conditions	Connect terminals A8 and A3, and terminals A11 and A9 with jumper wires: The front of seat should move down.	Faulty front up-down motor An open or high resistance in the wire
A3 . A11	BRN . PUR	Under all conditions	Connect terminals A8 and A11, and terminals A3 and A9 with jumper wires: The front of seat should move up.
A7 . A17	GRN . PNK	Under all conditions	Connect terminals A8 and A7, and terminals A17 and A9 with jumper wires: The rear of seat should move up.	Faulty rear up-down motor An open or high resistance in the wire
A7 . A17	GRN . PNK	Under all conditions	Connect terminals A8 and A17, and terminals A7 and A9 with jumper wires: The rear of seat should move down.