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.
• When you replace the E-pretensioner unit, check the HDS and replace the indicated side of E-pretensioner unit on the HDS.

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 (L SPOOL PWR 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	L SPOOL PWR
   Test point 1	Driver's E-pretensioner spool sensor 3P connector No. 3 (GRY)
   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 (L SPOOL PWR line) 2

   - 1. Measure the voltage between test points 1 and 2 without disconnecting the driver's E-pretensioner unit 16P connector.

   Test condition	Vehicle ON mode
   	Driver's E-pretensioner spool sensor 3P connector: disconnected
   Test circuit	L SPOOL PWR
   Test point 1	Driver's E-pretensioner unit 16P connector No. 10 (GRY)
   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 driver's E-pretensioner unit and the driver's E-pretensioner spool sensor.

   NO 

   The L SPOOL PWR wire is OK. Replace the E-pretensioner unit .

5. Open wire check (L SPOOL A 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	L SPOOL A
   Test point 1	Driver's E-pretensioner spool sensor 3P connector No. 2 (RED)
   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 (L SPOOL A line) 2

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

   - 2. Disconnect the following connectors.

   Driver's E-pretensioner unit 16P connector

   Driver's E-pretensioner spool sensor 3P connector

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

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

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

   Is there continuity?

   YES 

   The L SPOOL A wire is OK. Replace the E-pretensioner unit .

   NO 

   Repair an open in the wire between the driver's E-pretensioner unit and the driver's E-pretensioner spool sensor.

7. Open wire check (L SPOOL B 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	L SPOOL B
   Test point 1	Driver's E-pretensioner spool sensor 3P connector No. 1 (ORN)
   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 (L SPOOL B line) 2

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

   - 2. Disconnect the following connectors.

   Driver's E-pretensioner unit 16P connector

   Driver's E-pretensioner spool sensor 3P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	Driver's E-pretensioner unit 16P connector: disconnected
   	Driver's E-pretensioner spool sensor 3P connector: disconnected
   Test circuit	L SPOOL B
   Test point 1	Driver's E-pretensioner unit 16P connector No. 8 (ORN)
   Test point 2	Driver's E-pretensioner spool sensor 3P connector No. 1 (ORN)

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

   Is there continuity?

   YES 

   The L SPOOL B wire is OK. Replace the E-pretensioner unit .

   NO 

   Repair an open in the wire between the driver's E-pretensioner unit and the driver's E-pretensioner spool sensor.