Power Seat Control Unit Input Test/Replacement

NOTE: 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), or press the engine start/stop button to select the OFF mode
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 And 18P, 40P Connectors Terminals
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 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 6

TEST CONDITION INPUT CHART

Cavity	Wire	Test condition	Test Desired result	Possible cause if desired result is not obtained
B9	BLK	Under all conditions	Measure the voltage to ground: There should be less than 0.2V	Poor ground (G701) An open or high resistance in the wire
A4	BRN	Under all conditions	Measure the voltage to ground: There should be less than 0.2V	Poor ground (G701) An open or high resistance in the wire
A18	BRN	Under all conditions	Measure the voltage to ground: There should be less than 0.2V	Poor ground (G701) An open or high resistance in the wire
B34	BRN	Ignition switch ON (II), or power mode ON	Measure the voltage to ground: There should be battery voltage	Blown No 12 (7 5 A) fuse in the driver's under-dash fuse/relay box An open in the wire
B36	WHT	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	RED	Under all conditions	Measure the voltage to ground: There should be battery voltage	Blown No 3-4 (DR F/B) (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) (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
B26 (A/T)	GRN	Shift lever in P position	Measure the voltage to ground: There should be less than 0.2V	Poor ground (G101) Faulty transmission range switch An open or high resistance in the wire
B26 (A/T)	GRN	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)	GRN	Ignition switch ON (III), or power mode ON, parking brake lever pulled	Measure the voltage to ground: There should be less than 0.2V	Faulty parking brake switch An open or high resistance in the wire
B26 (M/T)	GRN	Ignition switch ON (III), or power mode ON, parking brake 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	BLU	Run the power seat motors	Measure the voltage to ground: There should be at least about 10V	Faulty position sensor A short to ground in the wire
B10 B29	GRN ORN	Run the recline motor	Measure the voltage between terminals B10 (+) and B29 (-): There should be about 2.5V average	Faulty position sensor An open ior high resistance in the wire A short to ground in the wire
B11 B29	WHT ORN	Run the slide motor	Measure the voltage between terminals B11 (+) and B29 (-): There should be about 2.5V average	Faulty position sensor An or high resistance open in the wire A short to ground in the wire
B12 B29	RED ORN	Run the front up-down motor	Measure the voltage between terminals B12 (+) and B29 (-): There should be about 2.5V average	Faulty position sensor An open or high resistance in the wire A short to ground in the wire
B13 B29	YEL ORN	Run the rear up-down motor	Measure the voltage between terminals B13 (+) and B29 (-): There should be about 2.5V average	Faulty position sensor An open or high resistance in the wire A short to ground in the wire
B1 B7	BLU GRY	Slide switch in FORWARD position	Measure the voltage between the terminals: There should be less then 0.2V	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B1 B24	BLU LT GRN	Slide switch in BACKWARD position	Measure the voltage between the terminals: There should be less then 0.2V	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B1 B6	BLU LT BLU	Recline switch in FORWARD position	Measure the voltage between the terminals: There should be less then 0.2V	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B1 B23	BLU GRN	Recline switch in BACKWARD position	Measure the voltage between the terminals: There should be less then 0.2V	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B1 B5	BLU ORN	Front up-down switch in UP position	Measure the voltage between the terminals: There should be less then 0.2V	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B1 B4	BLU RED	Front up-down switch in DOWN position	Measure the voltage between the terminals: There should be less then 0.2V	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B1 B22	BLU PNK	Rear up-down switch in UP position	Measure the voltage between the terminals: There should be less then 0.2V	Faulty driver's power seat adjustment switch An open or high resistance in the wire
B1 B3	BLU WHT	Rear up-down switch in DOWN position	Measure the voltage between the terminals: There should be less then 0.2V	Faulty driver's power seat adjustment switch An open or high resistance in the wire

Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode, then 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, the control unit must be faulty, replace it

TEST CONDITION INPUT CHART

Cavity	Wire	Test condition	Test Desired result	Possible cause if desired result is not obtained
B39	BLU	Under all conditions (disconnect the door multiplex control unit 37P connector)	Check for continuity between terminal B39 and door multiplex control unit 37P connector terminal No 33: There should be continuity	An open in the B-CAN wire
B39	BLU	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 door multiplex control unit 37P connector)	Check for continuity between terminal B40 and door multiplex control unit 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 B40 and immobilizer-keyless control unit 7P connector terminal No 4: There should be continuity	An open in the B-CAN wire
B38	PUR	Disconnect the power mirror control unit 24P connector	Check for continuity between terminal B38 and power mirror control unit 24P connector terminal No 13: There should be continuity	An open in the UART wire
A7 A17	GRY BLU	Under all conditions	Connect terminals A1 and A7, and terminals A17 and A4: The seat should slide backward	Faulty slide motor An open or high resistance in the wire
A7 A17	GRY BLU	Under all conditions	Connect terminals A1 and A17, and terminals A7 and A4 The seat should slide forward	Faulty slide motor An open or high resistance in the wire
A9 A11	YEL LT GRN	Under all conditions	Connect terminals A1 and A9, and terminals A11 and A4: The seat should recline forward	Faulty recline motor An open or high resistance in the wire
A9 A11	YEL LT GRN	Under all conditions	Connect terminals A1 and A11, and terminals A9 and A4: The seat should recline backward
A6 A16	BRN PUR	Under all conditions	Connect terminals A1 and A6, and terminals A16 and A4: The front of seat should move down	Faulty front up-down motor An open or high resistance in the wire
A6 A16	BRN PUR	Under all conditions	Connect terminals A1 and A16, and terminals A6 and A4: The front of seat should move up
A2 A10	GRN PNK	Under all conditions	Connect terminals A1 and A2, and terminals A10 and A4: The rear of seat should move up	Faulty rear up-down motor An open or high resistance in the wire
A2 A10	GRN PNK	Under all conditions	Connect terminals A1 and A10, and terminals A2 and A4: The rear of seat should move down