Driving Position Memory System (Power Mirror Control Unit and Power Seat Control Unit) Input Test (2016-18)

Power Seat Control Unit

NOTE:

SRS components are located in this area. Review the SRS component locations - Refer to: SRS Component Location Index (2013-18), or SRS Component Location Index (2013-18) , and precautions and procedures before doing repairs or servicing.
Before testing, make sure the No. A2-2 (60 A), No. A2-4 (50 A), and No. A29 (10 A) fuses in the under-hood fuse/relay box are OK.
Before testing, make sure the No. B5 (7.5 A), No. B16 (20 A), No. B17 (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.

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

2. Disconnect 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. With the connectors still disconnected, 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 resultis not obtained
B27	BRN^1 RED^2	Power mode ON	Measure the voltage to ground:There should be battery voltage.	Blown No. B5 (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. B16 (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. B17 (20 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire
A5	BRN^1 BLK^2	In all power modes	Measure the voltage to ground:There should be less than 0.2 V.	Poor ground (G701) An open or high resistance in the ground wire
A9	BRN	In all power modes	Measure the voltage to ground:There should be less than 0.2 V.	Poor ground (G701) An open or high resistance in the ground wire
B12	BLK	In all power modes	Measure the voltage to ground:There should be less than 0.2 V.	Poor ground (G701) 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

*1: Without ventilated seat*2: With ventilated seat

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired resultis not obtained
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 the terminals: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 the terminals: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 the terminals: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 the terminals: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^1 GRY^2 -BLU	Front up-down switch in UP position	Measure the voltage between the terminals: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 the terminals: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 the terminals: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 the terminals:There should be less than 0.2 V.	Faulty driver's power seat adjustment switch An open or high resistance in the wire

*1: Without ventilated seat*2: With ventilated seat

5. Reconnect the connectors, 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.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired resultis not obtained
B23	PUR	Disconnect the power mirror control unit 24P connector	Check for continuity between terminal B23 and power mirror control unit 24P connector terminal No. 24:There should be continuity.	An open in the UART wire
B23	PUR	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 wire

*1: Without ventilated seat*2: With ventilated seat

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired resultis not obtained
A2-A10	GRY-BLU^1 WHT^2	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	GRY-BLU^1 WHT^2	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.

*1: Without ventilated seat*2: With ventilated seat

Power Mirror Control Unit

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

7. Disconnect the power mirror control unit 24P connector .

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

8. 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, reconnect the connectors to electric steering lock, then go to step 9.

9. With the connector still disconnected, 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 10.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired resultis not obtained
1	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
13	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 Faulty under-dash 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 (G501) An open or high resistance in the ground wire
3	LT GRN	Under all conditions	Measure the voltage to ground:There should be less than 0.2 V.	Faulty power mirror switch Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
6	LT BLU	Mirror select switch in LEFT	Measure the voltage to ground:There should be less than 0.2 V.	Faulty power mirror switch Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
11	PNK	Mirror select switch in LEFT	Measure the voltage to ground:There should be less than 0.2 V.	Faulty power mirror switch Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
12	BLU	Mirror select switch in LEFT	Measure the voltage to ground:There should be less than 0.2 V.	Faulty power mirror switch Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
4	GRY	Mirror select switch in RIGHT	Measure the voltage to ground:There should be less than 0.2 V.	Faulty power mirror switch Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
5	RED	Mirror select switch in RIGHT	Measure the voltage to ground:There should be less than 0.2 V.	Faulty power mirror switch Poor ground (G501) or an open in the ground wire An open or high resistance in the wire
16	ORN	Mirror select switch in RIGHT	Measure the voltage to ground:There should be less than 0.2 V.	Faulty power mirror switch Poor ground (G501) or an open in the ground wire An open or high resistance in the wire

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired resultis not obtained
2	WHT	Power mode ON	Measure the voltage to ground:There should be about 5 V.	Faulty mirror position sensor A short to ground in the wire
9-7	ORN-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	GRY-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	YEL-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

10.Reconnect the connector, 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 resultis not obtained
24	YEL	Disconnect power seat control unit connector B (40P)	Check for continuity between terminal No. 24 and power seat control unit B (40P) connector terminal No. 23:There should be continuity.	An open in the UART wire
24	YEL	Disconnect power seat control unit connector B (40P)	Check for continuity to ground:There should be no continuity.	A short to ground in the UART wire
22-23	LT BLU-GRN	Under all conditions	Connect terminals No. 13 and No. 22, and terminals No. 23 and No. 15:The left mirror should move up.	Faulty left mirror actuator An open or high resistance in the wire
22-23	LT BLU-GRN	Under all conditions	Connect terminals No. 13 and No. 23, and terminals No. 22 and No. 15:The left mirror should move down.
21-22	BLU-LT BLU	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 BLU	Under all conditions	Connect terminals No. 13 and No. 21, and terminals No. 22 and No. 15:The left mirror should swing right.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired resultis not obtained
10-20	PNK-PUR	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	PNK-PUR	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	GRN-PUR	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	GRN-PUR	Under all conditions	Connect terminals No. 13 and No. 19, and terminals No. 20 and No. 15:The right mirror should swing right.

11.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 power mirror control unit.