DTC Troubleshooting: B1241 (D-A1), B1241 (59)

1.

Problem verification:

Problem verification

?1.	Clear the DTC with the HDS.

?2.	Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

?3.	Do the Self-Diagnostic Function with the HDS or the climate control unit.

?4.

Check for DTCs.

DTC Description	DTC
B1241 A problem in the blower motor circuit

Is DTC B1241 or Error on the DTC screen D-A1 (climate control panel without display) or 59 (climate control panel with display) indicated?


	YES

Go to step 2.


	NO

Intermittent failure. Check for loose wires or poor connections on the blower motor circuit.?

2.

Fuse check:

Fuse check

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.

Check the following fuse.

Fuse	No. A3-1 (40 A)
Location	Under-hood fuse/relay box

Is the fuse OK?


	YES

Go to step 3.


	NO

Replace the fuse, and recheck. If fuse blows again, repair a short in the No. A3-1 (40 A) fuse circuit.?

3.

Blower motor power circuit check:

Blower motor power circuit check

?1.

Disconnect the following connector.

Blower motor 2P connector

?2.	Turn the vehicle to the ON mode.

?3.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test condition	Blower motor 2P connector: disconnected
Test point 1	Blower motor 2P connector (female terminals) No. 2:
Test point 2	Body ground

Is there battery voltage?


	YES

Go to step 4.


	NO

Go to step 12.

4.

Blower motor operation check:

Blower motor operation check

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.	Reconnect the blower motor 2P connector.

?3.

Connect terminals A and B with a jumper wire.

Terminal A	Blower motor 2P connector (female terminals) No. 1:
Terminal B	Body ground

?4.	Turn the vehicle to the ON mode.

Does the blower motor run at high speed?


	YES

Go to step 5.


	NO

Replace the blower motor.?

5.

Open wire check (GND line):

Open wire check (GND line)

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.	Disconnect the jumper wire.

?3.

Disconnect the following connector.

Power transistor 4P connector

?4.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
Test condition	Power transistor 4P connector: disconnected
Test point 1	Power transistor 4P connector (female terminals) No. 2:
Test point 2	Body ground

Is there continuity?


	YES

The GND wire is OK. Go to step 6.


	NO

Check for an open in the GND wire. If the wire is OK, check for poor ground at G251.?

6.

Open wire check (BLW-M line):

Open wire check (BLW-M line)

?1.

Connect terminals A and B with a jumper wire.

Terminal A	Power transistor 4P connector (female terminals) No. 1:
Terminal B	Power transistor 4P connector (female terminals) No. 2:

?2.	Turn the vehicle to the ON mode.

Does the blower motor run at high speed?


	YES

The BLW-M wire is OK. Go to step 7.


	NO

Repair an open in the BLW-M wire.?

7.

Shorted wire check (BLW-V line):

Shorted wire check (BLW-V line)

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.	Disconnect the jumper wire.

?3.

Disconnect the following connector.

Climate control unit connector B (24P)

?4.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Climate control unit connector B (24P): disconnected
	Power transistor 4P connector: disconnected
Test point 1	Climate control unit connector B (24P) No. 12
Test point 2	Body ground

Is there continuity?


	YES

Repair a short to ground in the BLW-V wire.?


	NO

The BLW-V wire is not shorted. Go to step 8.

8.

Shorted wire check (BLW-G line):

Shorted wire check (BLW-G line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Climate control unit connector B (24P): disconnected
	Power transistor 4P connector: disconnected
Test point 1	Climate control unit connector B (24P) No. 11
Test point 2	Body ground

Is there continuity?


	YES

Repair a short to ground in the BLW-G wire.?


	NO

The BLW-G wire is not shorted. Go to step 9.

9.

Open wire check (BLW-V line):

Open wire check (BLW-V line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Climate control unit connector B (24P): disconnected
	Power transistor 4P connector: disconnected
Test point 1	Climate control unit connector B (24P) No. 12
Test point 2	Power transistor 4P connector (female terminals) No. 3:

Is there continuity?


	YES

The BLW-V wire is OK. Go to step 10.


	NO

Repair an open in the BLW-V wire.?

10.

Open wire check (BLW-G line):

Open wire check (BLW-G line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Climate control unit connector B (24P): disconnected
	Power transistor 4P connector: disconnected
Test point 1	Climate control unit connector B (24P) No. 11
Test point 2	Power transistor 4P connector (female terminals) No. 4:

Is there continuity?


	YES

The BLW-G wire is OK. Go to step 11.


	NO

Repair an open in the BLW-G wire.?

11.

Power transistor check:

Power transistor check

?1.	Test the power transistor.

Is the power transistor OK?


	YES

Replace the climate control unit.?


	NO

Replace the power transistor.?

NOTE: If the power transistor is faulty, check the blower motor for damage. If necessary, replace the blower motor.

12.

Front blower motor relay check:

Front blower motor relay check

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.	Remove the front blower motor relay from the under-hood fuse/relay box, and test it.

Is the relay OK?


	YES

Go to step 13.


	NO

Replace the front blower motor relay.?

13.

Open wire check (+B HTR MTR line):

Open wire check (+B HTR MTR line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
Test condition	Front blower motor relay: disconnected
Test point 1	Front blower motor relay 4P socket (female terminals) No. 1:
Test point 2	Body ground

Is there battery voltage?


	YES

The +B HTR MTR wire is OK. Go to step 14.


	NO

Repair an open in the +B HTR MTR wire.?

14.

Open wire check (IG2 A/C line):

Open wire check (IG2 A/C line)

?1.	Turn the vehicle to the ON mode.

?2.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test condition	Front blower motor relay: disconnected
Test point 1	Front blower motor relay 4P socket (female terminals) No. 3:
Test point 2	Body ground

Is there battery voltage?


	YES

The IG2 A/C wire is OK. Go to step 15.


	NO

Repair an open in the IG2 A/C wire.?

15.

Open wire check (GND line):

Open wire check (GND line)

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
Test condition	Front blower motor relay: disconnected
Test point 1	Front blower motor relay 4P socket (female terminals) No. 4:
Test point 2	Body ground

Is there continuity?


	YES

Repair an open in the BLOWER MTR wire.?


	NO

Check for an open in the GND wire. If the wire is OK, check for poor ground at G351.?