Driving Position Memory System (Door Multiplex Control Unit And Power Seat Control Unit) (2016 2017 2018 2019 2020 2021 2022)

NOTE:

Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A .
SRS components are located in this area. Review the SRS component locations , and precautions and procedures before doing repairs or servicing.
Before testing, make sure the No. A29 (10 A) fuse in the under-hood fuse/relay box is OK.
Before testing, make sure the No. B6 (7.5 A), No. B12 (20 A), No. B13 (20 A), No. B22 (7.5 A), and No. B42 (20 A) fuses in the under-dash fuse/relay box are OK.
Before testing, check for DTCs. If any DTCs are indicated, troubleshoot those DTCs first.

Power seat control unit

1. Press the engine start/stop button to select the OFF mode.

2. Disconnect the power seat control unit connectors .

NOTE:

All connector views are shown from the wire side of the female terminals.

Courtesy of HONDA, U.S.A., INC.

3. Inspect the connectors 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 4.

4. Reconnect the connector to the power window master switch, 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 5.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
B27	BRN	Power mode ON	Measure the voltage to ground: There should be battery voltage.	Blown No. B6 (7.5 A) fuse in the 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. A29 (10 A) fuse in the under-hood fuse/relay box Faulty 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. B12 (20 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire
A8	RED	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. B13 (20 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire
A5	BRN	All power modes	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	BRN	All power modes	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
B12	BLK	All power modes	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	GRN	Shift lever in P position/mode	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
B35	GRN	Shift lever in any position/mode other 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	Power mode ON	Measure the voltage to ground: There should be at least about 10 V.	Faulty position sensor A short to ground in the wire
B11 . B32	GRN . PUR	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 . PUR	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 PUR	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 PUR	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
B14 . B20	BLU BLU	Slide switch to the FORWARD position	Measure the voltage between terminals B14 and B20: There should be less than 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B37 . B20	LT GRN BLU	Slide switch to the BACKWARD position	Measure the voltage between terminals B37 and B20: There should be less than 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B15 . B20	LT BLU BLU	Recline switch to the FORWARD position	Measure the voltage between terminals B15 and B20: There should be less than 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B38 . B20	GRN BLU	Recline switch to the BACKWARD position	Measure the voltage between terminals B38 and B20: There should be less than 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B16 . B20	RED BLU	Front up-down switch in UP position	Measure the voltage between terminals B16 and B20: There should be less than 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B17 . B20	RED BLU	Front up-down switch in DOWN position	Measure the voltage between terminals B17 and B20: There should be less than 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B39 . B20	PNK BLU	Rear up-down switch in UP position	Measure the voltage between terminals B39 and B20: There should be less than 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B18 . B20	WHT BLU	Rear up-down switch in DOWN position	Measure the voltage between terminals B18 and B20: There should be less than 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire

5. Press the engine start/stop button to select the OFF mode.

6. Disconnect the connectors from the power seat control unit, and do these input tests at the following connectors:

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 7.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
A2 . A10	GRN BLU	Under all conditions	Connect terminals A1 and A2, and terminals A10 and A9: The seat should slide backward.	Faulty slide motor An open or high resistance in the wire
A2 . A10	GRN BLU	Under all conditions	Connect terminals A1 and A10, and terminals A2 and A9: The seat should slide forward.	Faulty slide motor An open or high resistance in the wire
A16 . A18	LT GRN YEL	Under all conditions	Connect terminals A8 and A16, and terminals A18 and A5: The seat should recline backward.	Faulty recline motor An open or high resistance in the wire
A16 . A18	LT GRN YEL	Under all conditions	Connect terminals A8 and A18, and terminals A16 and A5: The seat should recline forward.
A3 . A11	BRN PUR	Under all conditions	Connect terminals A1 and A3, and terminals A11 and A9: 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 A1 and A11, and terminals A3 and A9: The front of seat should move up.
A7 . A17	GRN PNK	Under all conditions	Connect terminals A8 and A7, and terminals A17 and A5: 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 A5: The rear of seat should move down.

Door Multiplex Control Unit

7. Press the engine start/stop button to select the OFF mode.

8. Disconnect the power window master switch 37P connector .

Courtesy of HONDA, U.S.A., INC.

9. 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 10.

10. Reconnect the connector to the power window master switch, 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 11.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
26	GRN	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. A29 (10 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
4	WHT	Power mode ON	Measure the voltage to ground: There should be battery voltage.	Blown No. B42 (20 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire
25	BRN	Power mode ON	Measure the voltage to ground: There should be battery voltage.	Blown No. B22 (7.5 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire
3	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G503) An open or high resistance in the ground wire
31	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G501) An open or high resistance in the ground wire
23	RED	Power mode ON, position 2 switch pressed	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driving position memory switch Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
23	RED	Power mode ON, position 2 switch released	Measure the voltage to ground: There should be about 5 V.	Faulty driving position memory switch A short to ground in the wire
22	GRY	Power mode ON, position 1 switch pressed	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driving position memory switch Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
22	GRY	Power mode ON, position 1 switch released	Measure the voltage to ground: There should be about 5 V.	Faulty driving position memory switch A short to ground in the wire
20	YEL	Power mode ON, SET switch pressed	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driving position memory switch Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
20	YEL	Power mode ON, SET switch released	Measure the voltage to ground: There should be about 5 V.	Faulty driving position memory switch A short to ground in the wire

11. Press the engine start/stop button to select the OFF mode.

12. Disconnect the connector from the power window master switch, 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 13.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
12	GRN	Under all conditions	Connect terminals No. 4 and No. 12 with a jumper wire: The driving position memory switch indicator 2 should come on.	Faulty LED Faulty driving position memory switch Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
10	PUR	Under all conditions	Connect terminals No. 4 and No. 10 with a jumper wire: The driving position memory switch indicator 1 should come on.	Faulty LED Faulty driving position memory switch Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
37	PNK	Under all conditions	Connect terminals No. 4 and No. 37 with a jumper wire: The driving position memory switch lights should come on.	Faulty LED Faulty driving position memory switch Poor ground (G501) or an open in the ground wire An open or high resistance in the wire

13. If multiple failures are found on more than one control unit, replace the power seat control unit . If input failures are related to a particular control unit, replace the control unit.