DTC B2850-13

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 (E-pretensioner)

1. 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.

   NO 

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

2. Spool sensor input voltage check

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

   Signal	Current conditions
   	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.

3. 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
   	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 .

   NO 

   Go to step 4.

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
   	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.

   NO 

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

5. 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.

   NO 

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

6. 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 .

   NO 

   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.

7. 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.

   NO 

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

8. 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 .

   NO 

   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.