DTC B2850-13

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DTC B2850-13 : Driver's E-Pretensioner Spool Sensor Power or Signal Circuit Open

NOTE:

Before doing this troubleshooting procedure, review General Troubleshooting Information .
Before replacing the E-pretensioner unit, check the E-pretensioner unit software version with the HDS. If the software version is not the latest, update the E-pretensioner unit software , and retest.

DTC Description	DTC
B2850-13 Driver's E-Pretensioner Spool Sensor Power or Signal Circuit Open

DTC (E-pretensioner)

Problem verification

-1. Clear the DTCs with the HDS.

-2. Turn the vehicle to the ON mode.

-3. Check for DTCs with the HDS.

DTC Description	DTC
B2850-13 Driver's E-Pretensioner Spool Sensor Power or Signal Circuit Open

Is DTC B2850-13 indicated?

YES

The failure is duplicated. Go to step 2.

Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting.

Spool sensor input voltage check

-1. Check the parameter (s) below with the HDS.

Signal	Current conditions
Signal	Values	Unit
Driver's Spool Sensor A Input Voltage
Driver's Spool Sensor B Input Voltage

Are spool sensors A and B indicated 0 V?

YES

Go to step 3.

NO (Only spool sensor A is indicated)

Go to step 5.

NO (Only spool sensor B is indicated)

Go to step 7.

Open wire check (E-PT MTR L VC line) 1

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

-2. Disconnect the following connector.

Driver's E-pretensioner spool sensor 3P connector

-3. Turn the vehicle to the ON mode.

-4. Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test condition	Driver's E-pretensioner spool sensor 3P connector: disconnected
Test circuit	E-PT MTR L VC
Test point 1	Driver's E-pretensioner spool sensor 3P connector No. 3 (YEL)
Test point 2	Body ground

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

Is there battery voltage?

YES

Faulty driver's E-pretensioner spool sensor; replace the driver's seat belt .

Go to step 4.

Open wire check (E-PT MTR L VC line) 2

-1. Measure the voltage between test points 1 and 2 without disconnecting the E-pretensioner unit connector A (16P).

Test condition	Vehicle ON mode
Test condition	Driver's E-pretensioner spool sensor 3P connector: disconnected
Test circuit	E-PT MTR L VC
Test point 1	E-pretensioner unit connector A (16P) No. 10 (YEL)
Test point 2	Body ground

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

Is there battery voltage?

YES

Repair an open in the wire between the E-pretensioner unit connector A (16P) of the E-pretensioner unit and the driver's E-pretensioner spool sensor.

The E-PT MTR L VC wire is OK. Replace the E-pretensioner unit .

Open wire check (E-PT MTR L GA line) 1

-1. Measure the voltage between test points 1 and 2 without disconnecting the driver's E-pretensioner spool sensor 3P connector.

Test condition	Vehicle ON mode
Test circuit	E-PT MTR L GA
Test point 1	Driver's E-pretensioner spool sensor 3P connector No. 2 (BLU)
Test point 2	Body ground

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

When slowly pulling out the seat belt, does the voltage change from 0 V?

YES

Go to step 6.

Faulty driver's E-pretensioner spool sensor; replace the driver's seat belt .

Open wire check (E-PT MTR L GA line) 2

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

-2. Disconnect the following connectors.

E-pretensioner unit connector A (16P)

Driver's E-pretensioner spool sensor 3P connector

-3. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	E-pretensioner unit connector A (16P): disconnected
	Driver's E-pretensioner spool sensor 3P connector: disconnected
Test circuit	E-PT MTR L GA
Test point 1	E-pretensioner unit connector A (16P) No. 14 (BLU)
Test point 2	Driver's E-pretensioner spool sensor 3P connector No. 2 (BLU)

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

Is there continuity?

YES

The E-PT MTR L GA wire is OK. Replace the E-pretensioner unit .

Repair an open in the wire between the E-pretensioner unit connector A (16P) of the E-pretensioner unit and the driver's E-pretensioner spool sensor.

Open wire check (E-PT MTR L GB line) 1

-1. Measure the voltage between test points 1 and 2 without disconnecting the driver's E-pretensioner spool sensor 3P connector.

Test condition	Vehicle ON mode
Test circuit	E-PT MTR L GB
Test point 1	Driver's E-pretensioner spool sensor 3P connector No. 1 (GRN)
Test point 2	Body ground

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

When slowly pulling out the seat belt, does the voltage change from 0 V?

YES

Go to step 8.

Faulty driver's E-pretensioner spool sensor; replace the driver's seat belt .

Open wire check (E-PT MTR L GB line) 2

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

-2. Disconnect the following connectors.

E-pretensioner unit connector A (16P)

Driver's E-pretensioner spool sensor 3P connector

-3. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	E-pretensioner unit connector A (16P): disconnected
	Driver's E-pretensioner spool sensor 3P connector: disconnected
Test circuit	E-PT MTR L GB
Test point 1	E-pretensioner unit connector A (16P) No. 8 (GRN)
Test point 2	Driver's E-pretensioner spool sensor 3P connector No. 1 (GRN)

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

Is there continuity?

YES

The E-PT MTR L GB wire is OK. Replace the E-pretensioner unit .

Repair an open in the wire between the E-pretensioner unit connector A (16P) of the E-pretensioner unit and the driver's E-pretensioner spool sensor.