Driving Position Memory System (Door Multiplex Control Unit, Power Mirror Control Unit, And Power Seat Control Unit)

Power Seat Control Unit

NOTE:

Before testing, check for DTCs. If any DTCs are indicated, troubleshoot those DTCs first.
If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to:
Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .
SRS components are located in this area. Review the SRS component locations - Refer to:
SRS Component Location Index (2016) or

Component Location Index (2017 2018 2019 2020 2021) and the

Precautions and Procedures before doing repairs or service.
Before testing, make sure the No. A26 (10 A) fuse in the under-hood fuse/relay box is OK.
Before testing, make sure the No. C1 (20 A), No. C15 (20 A), No. C23 (7.5 A), No. C29 (7.5 A), and No. C36 (20 A) fuses in the under-dash fuse/relay box are OK.

1. Turn the vehicle to the OFF (LOCK) 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 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 5.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
A13	GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. C29 (7.5 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire
A11	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. A26 (10 A) fuse in the under-hood fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire
B6	LT BLU	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. C36 (20 A) fuse in the under-dash fuse/relay 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. C15 (20 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire
B2	BLK	In 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
B5	BLK	In 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
A20	BLK	In 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
A1*1	BLU	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 An open or high resistance in the wire
A1*1	BLU	Shift lever in any position/mode other than P	Measure the voltage to ground: There should be at least about 10 V.	Faulty transmission range switch A short to ground in the wire
A1*2	BLU	Shift position/mode in P	Check for continuity to ground: There should be continuity.	An open or cause if desired result is not obtained Faulty TCM Faulty SBW shifter control module
A1*2	BLU	Shift position/mode in any position other than P	Check for continuity to ground: There should be no continuity.	A short to ground in the wire Faulty TCM Faulty SBW shifter control module
A6	LT BLU	Vehicle ON mode	Measure the voltage to ground: There should be at least about 10 V.	Faulty position sensor A short to ground in the wire
A10 • A19	WHT • BRN	Run the recline motor	Measure the voltage between terminals A10 (+) and A19 (-): 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
A8 • A19	RED • BRN	Run the slide motor	Measure the voltage between terminals A8 (+) and A19 (-): 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
A7 • A19	PNK • BRN	Run the front up-down motor	Measure the voltage between terminals A7 (+) and A19 (-): 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
A9 • A19	GRN • BRN	Run the rear up-down motor	Measure the voltage between terminals A9 (+) and A19 (-): 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

*1: 6-speed A/T

*2: 9-speed A/T

5. Turn the vehicle to the OFF (LOCK) 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
A18	LT GRN	Disconnect the power mirror control unit 24P connector	Check for continuity between terminal A18 and power mirror control unit 24P connector terminal No. 24: There should be continuity.	An open in the UART (DPMS) wire
A18	LT GRN	Disconnect the power mirror control unit 24P connector	Check for continuity to ground: There should be no continuity.	A short to ground in the UART (DPMS) wire
B3 • B1	BLU • GRN	Under all conditions	Connect terminals B6 and B3, and terminals B1 and B2: The seat should slide forward.	Faulty slide motor An open or high resistance in the wire
B3 • B1	BLU • GRN	Under all conditions	Connect terminals B6 and B1, and terminals B3 and B2: The seat should slide backward.	Faulty slide motor An open or high resistance in the wire
B8 • B11	YEL • GRY	Under all conditions	Connect terminals B12 and B8, and terminals B11 and B5: The seat should recline forward.	Faulty recline motor An open or high resistance in the wire
B8 • B11	YEL • GRY	Under all conditions	Connect terminals B12 and B11, and terminals B8 and B5: The seat should recline backward.
B10 • B7	RED • WHT	Under all conditions	Connect terminals B6 and B10, and terminals B7 and B2: The front of seat should move up.	Faulty front up-down motor An open or high resistance in the wire
B10 • B7	RED • WHT	Under all conditions	Connect terminals B6 and B7, and terminals B10 and B2: The front of seat should move down.
B9 • B4	PUR • BRN	Under all conditions	Connect terminals B12 and B9, and terminals B4 and B5: The rear of seat should move up.	Faulty rear up-down motor An open or high resistance in the wire
B9 • B4	PUR • BRN	Under all conditions	Connect terminals B12 and B4, and terminals B9 and B5: The rear of seat should move down.

Power Mirror Control Unit

7. Turn the vehicle to the OFF (LOCK) mode.

8. Disconnect the power mirror control unit 24P 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 mirror 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 11.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
1	GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. C29 (7.5 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire
13	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. A26 (10 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
15	BLK	In all power modes	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G401) An open or high resistance in the ground wire
3	LT BLU	Under all conditions	Measure the voltage to ground: There should be less than 0.2 V.	Faulty power mirror switch Poor ground (G401) or an open in the ground wire An open or high resistance in the wire
6	WHT	Mirror select switch in LEFT	Measure the voltage to ground: There should be less than 0.2 V.	Faulty power mirror switch Poor ground (G401) or an open in the ground wire An open or high resistance in the wire
11	PNK
12	YEL
4	TAN	Mirror select switch in RIGHT	Measure the voltage to ground: There should be less than 0.2 V.	Faulty power mirror switch Poor ground (G401) or an open in the ground wire An open or high resistance in the wire
5	BLU
16	GRY
2	YEL	Vehicle ON mode	Measure the voltage to ground: There should be about 5 V.	Faulty mirror position sensor A short to ground in the wire
9 • 7	PNK • LT GRN	Swing the left mirror from full left to full right	Measure the voltage between terminals No. 9 and No. 7: There should be about 0.5 V to 4.5 V.	Faulty left mirror position sensor An open or high resistance in the wire A short to ground in the wire
8 • 7	PUR • LT GRN	Move the left mirror from full up to full down	Measure the voltage between terminals No. 8 and No. 7: There should be about 0.5 V to 4.5 V.	Faulty left mirror position sensor An open or high resistance in the wire A short to ground in the wire
17 • 7	BRN • LT GRN	Swing the right mirror from full left to full right	Measure the voltage between terminals No. 17 and No. 7: There should be about 0.5 V to 4.5 V.	Faulty right mirror position sensor An open or high resistance in the wire A short to ground in the wire
18 • 7	GRN • LT GRN	Move the right mirror from full up to full down	Measure the voltage between terminals No. 18 and No. 7: There should be about 0.5 V to 4.5 V.	Faulty right mirror position sensor An open or high resistance in the wire A short to ground in the wire

11. Turn the vehicle to the OFF (LOCK) mode.

12. Disconnect the connector from the power mirror 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 13.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
24	LT GRN	Disconnect power seat control unit connector A (20P)	Check for continuity between terminal No. 24 and power seat control unit A (20P) connector terminal No. 18: There should be continuity.	An open in the UART (DPMS) wire
24	LT GRN	Disconnect power seat control unit connector A (20P)	Check for continuity to ground: There should be no continuity.	A short to ground in the UART (DPMS) wire
22 • 23	LT GRN • RED	Under all conditions	Connect terminals No. 13 and No. 22, and terminals No. 23 and No. 15: The left mirror should move down.	Faulty left mirror actuator An open or high resistance in the wire
22 • 23	LT GRN • RED	Under all conditions	Connect terminals No. 13 and No. 23, and terminals No. 22 and No. 15: The left mirror should move up.
21 • 22	BLU • LT GRN	Under all conditions	Connect terminals No. 13 and No. 22, and terminals No. 21 and No. 15: The left mirror should swing left.	Faulty left mirror actuator An open or high resistance in the wire
21 • 22	BLU • LT GRN	Under all conditions	Connect terminals No. 13 and No. 21, and terminals No. 22 and No 15:The left mirror should swing right.
10 • 20	BRN • WHT	Under all conditions	Connect terminals No. 13 and No. 10, and terminals No. 20 and No. 15: The right mirror should move up.	Faulty right mirror actuator An open or high resistance in the wire
10 • 20	BRN • WHT	Under all conditions	Connect terminals No. 13 and No. 20, and terminals No. 10 and No. 15: The right mirror should move down.
19 • 20	RED • WHT	Under all conditions	Connect terminals No. 13 and No. 20, and terminals No. 19 and No. 15 :The right mirror should swing left.	Faulty right mirror actuator An open or high resistance in the wire
19 • 20	RED • WHT	Under all conditions	Connect terminals No. 13 and No. 19, and terminals No. 20 and No. 15: The right mirror should swing right.

Door Multiplex Control Unit

13. Turn the vehicle to the OFF (LOCK) mode.

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

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

15. 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 16.

16. 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 17.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
4	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. C1 (20 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire
26	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. A26 (10 A) fuse in the under-hood fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire
25	LT GRN	Vehicle ON mode	Measure the voltage to ground: There should be battery voltage.	Blown No. C23 (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 (G401) 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 (G401) An open or high resistance in the ground wire
22	GRN	Vehicle ON mode, POSITION 1 button pressed	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driving position memory switch Poor ground (G401) or an open in the ground wire An open or high resistance in the wire Faulty door multiplex control unit
22	GRN	Vehicle ON mode, POSITION 1 button released	Measure the voltage to ground: There should be about 5 V.	Faulty driving position memory switch A short to ground in the wire Faulty door multiplex control unit
23	RED	Vehicle ON mode, POSITION 2 button pressed	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driving position memory switch Poor ground (G401) or an open in the ground wire An open or high resistance in the wire Faulty door multiplex control unit
23	RED	Vehicle ON mode, POSITION 2 button released	Measure the voltage to ground: There should be about 5 V.	Faulty driving position memory switch A short to ground in the wire Faulty door multiplex control unit
20	TAN	Vehicle ON mode, SET button pressed	Measure the voltage to ground: There should be less than 0.2 V.	Faulty driving position memory switch Poor ground (G401) or an open in the ground wire An open or high resistance in the wire Faulty door multiplex control unit
20	TAN	Vehicle ON mode, SET button released	Measure the voltage to ground: There should be about 5 V.	Faulty driving position memory switch A short to ground in the wire Faulty door multiplex control unit

17. Turn the vehicle to the OFF (LOCK) mode.

18. 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 19.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
10	YEL	Under all conditions	Connect terminals No. 26 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 (G401) or an open in the ground wire An open or high resistance in the wire
12	GRY	Under all conditions	Connect terminals No. 26 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 (G401) or an open in the ground wire An open or high resistance in the wire
37	GRN	Under all conditions	Connect terminals No. 26 and No. 37 with a jumper wire: The driving position memory switch illumination should come on.	Faulty LED Faulty driving position memory switch Poor ground (G401) or an open in the ground wire An open or high resistance in the wire

19. 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.