DTC Troubleshooting: B1828

DTC B1828: Power Seat Recline Motor Pulse Error

DTC Description	DTC
B1828 Power Seat Recline motor pulse error

NOTE:

	If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.
	When check the REC MTR FR line circuit, do not operate the rear seat access lever, becouse limit switch is located in the circuit.
	If DTC B1827 and B1828 are both indicated, check for a blown No. B15 (20 A) fuse in the under-dash fuse/relay box. If the fuse blows again, check for a short to ground in the recline motor circuit.

Problem verification:

Problem verification

?1.	Clear the DTCs with the HDS.

?2.	Press the engine start/stop button at least 20 times, then wait for at least 20 seconds.

?3.	Operate the power seat adjustment switch for several seconds in each direction. NOTE: DTC B1828 is stored when the recline switch is operated more than 1 second after the seat moves to the most forward or backward position, even when the system is OK.

?4.

Check for DTCs with the HDS.

DTC Description	DTC
B1828 Power Seat Recline motor pulse error

Is DTC B1828 indicated?


	DTC B1828 is indicated

Go to step 2.


	DTC B1836 is also indicated

Go to the DTC B1836 troubleshooting.?


	DTC B1825, B1826, and/or B1827 are also indicated

Go to step 6.


	NO

Intermittent failure, the system is OK at this time. Check for loose or poor connections.?

Determine possible failure area (motor operation, motor sensor):

Determine possible failure area (motor operation, motor sensor)

?1.	Press the engine start/stop button to select the OFF mode and then the ON mode.

?2.	Operate the rear recline switch for 2 seconds, and check the recline motor operation.

Does the recline motor run smoothly?


	YES

Go to step 3.


	NO

Go to step 8.

Open wire check (RESE, SEG lines):

Open wire check (RESE, SEG lines)

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

?2.

Disconnect the following connectors.

Recline motor/position sensor 5P connector

Power seat control unit connector B (20P)

?3.

Check for continuity between test points 1 and 2 respectively.

Test condition	OFF mode Recline motor/position sensor 5P connector: disconnected Power seat control unit connector B (20P): disconnected
Test circuit	RESE
Test point 1	Recline motor/position sensor 5P connector No. 3 (GRN)
Test point 2	Power seat control unit connector B (20P) No. 10 (GRN)

Test circuit	SEG
Test point 1	Recline motor/position sensor 5P connector No. 4 (WHT)
Test point 2	Power seat control unit connector B (20P) No. 19 (WHT)

Is there continuity?


	YES

The RESE, SEG wires are not open. Go to step 4.


	NO

Repair an open or high resistance in the wire.?

Shorted wire check (RESE line):

Shorted wire check (RESE line)

?1.

Check for continuity between test points 1 and 2.

Test condition	OFF mode Recline motor/position sensor 5P connector: disconnected Power seat control unit connector B (20P): disconnected
Test circuit	RESE
Test point 1	Power seat control unit connector B (20P) No. 10 (GRN)
Test point 2	Body ground

Is there continuity?


	YES

Repair a short to ground in the wire.?


	NO

The RESE wire is not shorted. Go to step 5.

Recline position sensor check:

Recline position sensor check

?1.	Reconnect power seat control unit connector B (20P).

?2.	Press the engine start/stop button to select the ON mode.

?3.

Measure the voltage between test points 1(+) and 2(-).

Test condition	ON mode Recline motor/position sensor 5P connector: disconnected
Test circuit	RESE, SEG
Test point 1	Recline motor/position sensor 5P connector No. 3 (GRN) (+)
Test point 2	Recline motor/position sensor 5P connector No. 4 (WHT) (-)

Is there about 5 V?


	About 5 V

Faulty recline motor/position sensor; replace the seat frame assembly.?


	No voltage

Replace the power seat control unit.?


	Battery voltage

Repair a short to power in the wire (sensor line).?

Open wire check (SVCC, SEG lines):

Open wire check (SVCC, SEG lines)

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

?2.

Disconnect the following connectors.

Recline motor/position sensor 5P connector

Power seat control unit connector B (20P)

?3.

Check for continuity between test points 1 and 2 respectively.

Test condition	OFF mode Recline motor/position sensor 5P connector: disconnected Power seat control unit connector B (20P): disconnected
Test circuit	SVCC
Test point 1	Recline motor/position sensor 5P connector No. 5 (PUR)
Test point 2	Power seat control unit connector B (20P) No. 6 (PUR)

Test circuit	SEG
Test point 1	Recline motor/position sensor 5P connector No. 4 (WHT)
Test point 2	Power seat control unit connector B (20P) No. 19 (WHT)

Is there continuity?


	YES

The SVCC and SEG wires are OK. Go to step 7.


	NO

Repair an open or high resistance in the wire.?

Power seat control unit check:

Power seat control unit check

?1.	Reconnect power seat control unit connector B (20P).

?2.	Press the engine start/stop button to select the ON mode.

?3.

Measure the voltage between test points 1 and 2.

Test condition	ON mode Recline motor/position sensor 5P connector: disconnected
Test circuit	SVCC, SEG
Test point 1	Power seat control unit connector B (20P) No. 6 (PUR)
Test point 2	Power seat control unit connector B (20P) No. 19 (WHT)

Is there battery voltage when the recline switch is operated?


	YES

Faulty recline motor/position sensor; replace the seat frame assembly.?


	NO

Replace the power seat control unit.?

Fuse check:

Fuse check

?1.

Check the following fuse.

Fuse	No. B15 (20 A)
Location	Under-hood fuse/relay box

Is the fuse OK?


	YES

Go to step 9.


	NO

Replace the fuse. If the fuse blows again, repair the short to ground in the No. B15 (20 A) fuse circuit.?

Open wire check (+B DR P/SEAT REC/VMP2 line):

Open wire check (+B DR P/SEAT REC/VMP2 line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	OFF mode
Test circuit	VMP2

2-door

Test point 1	Power seat control unit connector A (12P) No. 12 (LT BLU)
Test point 2	Body ground

4-door

Test point 1	Power seat control unit connector A (12P) No. 12 (PNK)
Test point 2	Body ground

Is there battery voltage?


	YES

The +B DR P/SEAT REC/VMP2 wire is not open. Go to step 10.


	NO

Repair an open or high resistance in the wire.?

10.

Open wire check (PG 2 line):

Open wire check (PG 2 line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	OFF mode
Test circuit	PG 2

2-door

Test point 1	Power seat control unit connector A (12P) No. 5 (BRN)
Test point 2	Body ground

4-door

Test point 1	Power seat control unit connector A (12P) No. 5 (BLK)
Test point 2	Body ground

Is there 0.2 V or more?


	YES

Repair an open or high resistance in the ground wire or poor ground (G651).?


	NO

The PG 2 wire is not open. Go to step 11.

11.

Open wire check (REC MTR FR, REC MTR RR lines):

Open wire check (REC MTR FR, REC MTR RR lines)

?1.

Disconnect the following connectors.

Recline motor/position sensor 5P connector

Power seat control unit connector A (12P)

?2.

Check for continuity between test points 1 and 2 respectively.

Test condition

OFF mode
Recline motor/position sensor 5P connector: disconnected
Power seat control unit connector A (12P): disconnected

2-door

Test circuit	REC MTR FR
Test point 1	Recline motor/position sensor 5P connector No. 2 (BLK)
Test point 2	Power seat control unit connector A (12P) No. 8 (GRY)

4-door

Test circuit	REC MTR FR
Test point 1	Recline motor/position sensor 5P connector No. 2 (GRY)
Test point 2	Power seat control unit connector A (12P) No. 8 (GRY)

Test circuit	REC MTR RR
Test point 1	Recline motor/position sensor 5P connector No. 1 (RED)
Test point 2	Power seat control unit connector A (12P) No. 11 (RED)

Is there continuity?


	YES

The REC MTR FR and REC MTR RR wires are not open. Go to step 12.


	NO

Repair an open or high resistance in the wire.?

12.

Shorted wire check (REC MTR FR, REC MTR RR lines):

Shorted wire check (REC MTR FR, REC MTR RR lines)

?1.

Check for continuity between test points 1 and 2 individually.

Test condition

OFF mode
Recline motor/position sensor 5P connector: disconnected
Power seat control unit connector A (12P): disconnected

2-door

Test circuit	REC MTR FR
Test point 1	Recline motor/position sensor 5P connector No. 2 (BLK)
Test point 2	Body ground

4-door

Test circuit	REC MTR FR
Test point 1	Recline motor/position sensor 5P connector No. 2 (GRY)
Test point 2	Body ground

Test circuit	REC MTR RR
Test point 1	Recline motor/position sensor 5P connector No. 1 (RED)
Test point 2	Body ground

Is there continuity?


	YES

Repair a short to ground in the wire.?


	NO

The REC MTR FR and REC MTR RR wires are OK. Go to step 13.

13.

Recline motor check:

Recline motor check

?1.	Test the recline motor.

Is the motor OK?


	YES

Replace the power seat control unit.?


	NO

Faulty recline motor/position sensor; replace the seat frame assembly.?