Power Seat Control Unit Input Test/Replacement

NOTE:

SRS components are located in this area. Review the SRS component locations 4-door (see COMPONENT LOCATION INDEX ), 2-door (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 Power Seat Control Unit Connector Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

[]: 2-door
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.

TROUBLE SYMPTOMS CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
B34	BLK/YEL	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. 2 (7.5 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
B36	BLU	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 15 (10 A) fuse in the under-hood fuse/relay box An open or high resistance in the wire
A1	PNK	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 3-4 (DR F/B STD) (60 A) fuse in the under-hood fuse/relay box Blown No. 21 (20 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
A8	LT BLU	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 3-4 (DR F/B STD) (60 A) fuse in the under-hood fuse/relay box Blown No. 19 (20 A) fuse in the driver's under-dash fuse/relay box An open or high resistance in the wire
B9	BLK	In all ignition switch positions	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
A4	BLK	In all ignition switch positions	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
A18	BLK [BLK/WHT]	In all ignition switch positions	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
B26 (AT)	BLK/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
B26 (AT)	BLK/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
B26 (M/T)	BLK/BLU	Parking brake switch ON (Level pulled)	Measure the voltage to ground: There should be less than 0.2 V.	Faulty Parking brake switch An open or high resistance in the wire
B26 (M/T)	BLK/BLU	Parking brake switch OFF (Lever released)	Measure the voltage to ground: There should be about 5 V.	Faulty Parking brake switch A short to ground in the wire
B15	PUR [WHT/BLK]	Run the power seat motors	Measure the voltage to ground: There should be at least about 10 V.	Faulty position sensor A short to ground in the wire
B10 B29	GRN [BLU/WHT] WHT [GRN/BLK]	Run the recline motor	Measure the voltage between terminals B10 (+) and B29 (-): 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
B11 B29	BRN [YEL/BLK] WHT [GRN/BLK]	Run the slide motor	Measure the voltage between terminals B11 (+)and B29 (-): 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
B12 B29	PNK [BLU/BLK] WHT [GRN/BLK]	Run the front up-down motor	Measure the voltage between terminals B12 (+) and B29 (-): 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
B13 B29	YEL [GRN/WHT] WHT [GRN/BLK]	Run the rear up-down motor	Measure the voltage between terminals B13 (+) and B29 (-): 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
B1 B7	LT BLU [BLK/BRN] BLU	Slide 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
B1 B24	LT BLU [BLK/BRN] BRN	Slide 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
B1 B6	LT BLU [BLK/BRN] GRY	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
B1 B23	LT BLU [BLK/BRN] RED	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
B1 B5	LT BLU [BLK/BRN] LT GRN	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
B1 B4	LT BLU [BLK/BRN] WHT	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
B1 B22	LT BLU [BLK/BRN] BLU	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
B1 B3	LT BLU [BLK/BRN] ORN	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
[]: 2-door

Turn the ignition switch to LOCK (0).

Disconnect the connectors from 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.

TROUBLE SYMPTOMS CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
B39	BLK	Under all conditions (disconnect the power window master switch 37P connector)	Check for continuity between terminal B39 and power window master switch 37P connector terminal No. 33: There should be continuity.	An open in the B-CAN wire
B39	BLK	Under all conditions (disconnect the immobilizer-keyless control unit 7P connector)	Check for continuity between terminal B39 and immobilizer-keyless control unit 7P connector terminal No. 3: There should be continuity.	An open in the B-CAN wire
B40	PNK	Under all conditions (disconnect the power window master switch 37P connector)	Check for continuity between terminal B40 and power window master switch 37P connector terminal No. 35: There should be continuity.	An open in the B-CAN wire
B40	PNK	Under all conditions (disconnect the immobilizer-keyless control unit 7P connector)	Check for continuity between terminal B39 and immobilizer-keyless control unit 7P connector terminal No. 4: There should be continuity.	An open in the B-CAN wire
A7 A17	WHT [LT GRN] YEL	Under all conditions	Connect terminals A8 and A7, and terminals A17 and A18 with jumper wires: The seat should slide backward.	Faulty slide motor An open or high resistance in the wire
A7 A17	WHT [LT GRN] YEL	Under all conditions	Connect terminals A8 and A17, and terminals A7 and A18 with jumper wires: The seat should slide forward.	Faulty slide motor An open or high resistance in the wire
A9 A11	GRY [RED] RED [GRY]	Under all conditions	Connect terminals A1 and A9, and terminals A11 and A4 with jumper wires: The seat should recline forward.	Faulty recline motor An open or high resistance in the wire
A9 A11	GRY [RED] RED [GRY]	Under all conditions	Connect terminals A1 and A11, and terminals A9 and A4 with jumper wires: The seat should recline backward.
A6 A16	YEL [BRN/WHT] ORN	Under all conditions	Connect terminals A8 and A6, and terminals A16 and A18 with jumper wires: The front of seat should move down.	Faulty front up-down motor An open or high resistance in the wire
A6 A16	YEL [BRN/WHT] ORN	Under all conditions	Connect terminals A8 and A16, and terminals A6 and A18 with jumper wires: The front of seat should move up.
A2 A10	GRN WHT [BLU]	Under all conditions	Connect terminals A1 and A2, and terminals A10 and A4 with jumper wires: The rear of seat should move up.	Faulty rear up-down motor An open or high resistance in the wire
A2 A10	GRN WHT [BLU]	Under all conditions	Connect terminals A1 and A10, and terminals A2 and A4 with jumper wires: The rear of seat should move down.
[]: 2-door