Honda CR-V: DTC 21-1x ("x" can be 0 thru 9 or A thru F): Open or Increased Resistance in Driver's Seat Belt Tensioner

Honda CR-V (2006–2011) Service Manual / Restraints / SRS (Supplemental Restraint System) / DTC Troubleshooting / DTC 21-1x ("x" can be 0 thru 9 or A thru F): Open or Increased Resistance in Driver's Seat Belt Tensioner

DTC 21-1x ("x" can be 0 thru 9 or A thru F): Open or Increased Resistance in Driver's Seat Belt Tensioner

Special Tools Required

NOTE: Before doing this troubleshooting procedure, review SRS Precautions and Procedures.

1. Erase the DTC memory.

2. Turn the ignition switch ON (II), and check that the SRS indicator comes on for about 6 seconds and then goes off.

Does the SRS indicator stay on, and is DTC 21-1x indicated? YES-Go to step 3.

NO-Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, go to the DTC Troubleshooting Index.

3. Turn the ignition switch OFF. Disconnect the negative cable from the battery, and wait for 3 minutes.

4. Disconnect the floor wire harness 4P connector (A) from the driver's seat belt tensioner.

Honda CR-V. SRS (Supplemental Restraint System)

5. Connect the SRS inflator simulator (2 Ω connectors) and simulator lead K to the floor wire harness.

6. Reconnect the negative cable to the battery.

7. Erase the DTC memory.

8. Read the DTC.

Is DTC 21-1x indicated? YES-Go to step 9.

NO-Open or increased resistance in the driver's seat belt tensioner; replace the driver's seat belt.

9. Turn the ignition switch OFF. Disconnect the negative cable from the battery, and wait for 3 minutes.

10. Disconnect both seat belt buckle tensioner 4P connectors (see step 8) and the front passenger's seat belt tensioner 4P connector (see step 7 ).

11. Disconnect SRS unit connector B (28P) from the SRS unit (see step 9).

12. Check resistance between the No.1 and the No.2 terminals of SRS unit connector B (28P). There should be 2.0-3.0 Ω.

Honda CR-V. SRS (Supplemental Restraint System)

Is the resistance as specified? YES-Faulty SRS unit or poor connection at SRS unit connector B (28P) and the SRS unit. Check the connection; if the connection is OK, replace the SRS unit.

NO-Open or increased resistance in the floor wire harness; replace the floor wire harness.

DTC 21-3x ("X" can be 0 thru 9 or A thru F): Short to Another Wire or Decreased Resistance in Driver's Seat Belt Tensioner

Special Tools Required

NOTE: Before doing this troubleshooting procedure, review SRS Precautions and Procedures.

1. Erase the DTC memory.

2. Turn the ignition switch ON (II), and check that the SRS indicator comes on for about 6 seconds and then goes off.

Does the SRS indicator stay on, and is DTC 21-3x indicated? YES-Go to step 3.

NO-Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, go to the DTC Troubleshooting Index.

3. Turn the ignition switch OFF. Disconnect the negative cable from the battery, and wait for 3 minutes.

4. Disconnect the floor wire harness 4P connector (A) from the driver's seat belt tensioner.

Honda CR-V. SRS (Supplemental Restraint System)

5. Connect the SRS inflator simulator (2 Ω connectors) and simulator lead K to the floor wire harness.

6. Reconnect the negative cable to the battery.

7. Erase the DTC memory.

8. Read the DTC.

Is DTC 21-3x1ndicated? YES-Go to step 9.

NO-Short in the driver's seat belt tensioner; replace the driver's seat belt.

9. Turn the ignition switch OFF. Disconnect the negative cable from the battery, and wait for 3 minutes.

10. Disconnect both seat belt buckle tensioner 4P connectors (see step 8) and the front passenger's seat belt tensioner 4P connector (see step 7).

11. Disconnect SRS unit connector B (28P) from the SRS unit (see step 9).

12. Disconnect the simulator lead from the floor wire harness.

13. Check resistance between the No.1 and the No.2 terminals of SRS unit connector B (28P). There should be an open circuit (ohmmeter reads OL) or at least 1 M Ω.

Honda CR-V. SRS (Supplemental Restraint System)

Is the resistance as specified? YES-Faulty SRS unit or poor connection at SRS unit connector B (28P) and the SRS unit. Check the connection; if the connection is OK, replace the SRS unit.

NO-Short in the floor wire harness; replace the floor wire harness.

DTC 21-8x ("x" can be 0 thru 9 or A thru F): Short to Power in Driver's Seat Belt Tensioner

Special Tools Required

NOTE: Before doing this troubleshooting procedure, review SRS Precautions and Procedures.

1. Erase the DTC memory.

2. Turn the ignition switch ON (II), and check that the SRS indicator comes on for about 6 seconds and then goes off.

Does the SRS indicator stay on, and is DTC 21-8x indicated? YES-Go to step 3.

NO-Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, go to the DTC Troubleshooting Index.

3. Turn the ignition switch OFF. Disconnect the negative cable from the battery, and wait for 3 minutes.

4. Disconnect the floor wire harness 4P connector (A) from the driver's seat belt tensioner.

Honda CR-V. SRS (Supplemental Restraint System)

5. Connect the SRS inflator simulator (2 Ω connectors) and simulator lead K to the floor wire harness.

6. Reconnect the negative cable to the battery.

7. Erase the DTC memory.

8. Read the DTC.

Is DTC 21-8x indicated? YES-Go to step 9.

NO-Short to power in the driver's seat belt tensioner; replace the driver's seat belt.

9. Turn the ignition switch OFF. Disconnect the negative cable from the battery, and wait for 3 minutes.

10. Disconnect both seat belt buckle tensioner 4P connectors (see step 8) and the front passenger's seat belt tensioner 4P connector (see step 7).

11. Disconnect SRS unit connector B (28P) from the SRS unit (see step 9).

12. Disconnect the simulator lead from the floor wire harness.

13. Reconnect the negative cable to the battery.

14. Turn the ignition switch ON (II).

15. Check for voltage between the No.1 terminal of SRS unit connector B (28P) and body ground, and between the No.2 terminal and body ground.

There should be 0.5 V or less.

Honda CR-V. SRS (Supplemental Restraint System)

Is the voltage as specified? YES-Faulty SRS unit or poor connection at SRS unit connector B (28P) and the SRS unit. Check the connection; if the connection is OK, replace the SRS unit.

NO-Short to power in the floor wire harness; replace the floor wire harness.

DTC 21-9x ("x" can be 0 thru 9 or A thru F): Short to Ground in Driver's Seat Belt Tensioner

Special Tools Required

NOTE: Before doing this troubleshooting procedure, review SRS Precautions and Procedures.

1. Erase the DTC memory.

2. Turn the ignition switch ON (II), and check that the SRS indicator comes on for about 6 seconds and then goes off.

Does the SRS indicator stay on, and is DTC 21-9x indicated? YES-Go to step 3.

NO-Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, go to the DTC Troubleshooting Index.

3. Turn the ignition switch OFF. Disconnect the negative cable from the battery, and wait for 3 minutes.

4. Disconnect the floor wire harness 4P connector (A) from the driver's seat belt tensioner.

Honda CR-V. SRS (Supplemental Restraint System)

5. Connect the SRS inflator simulator (2 Ω connectors) and simulator lead K to the floor wire harness.

6. Reconnect the negative cable to the battery.

7. Erase the DTC memory.

8. Read the DTC.

Is DTC 21-9x indicated? YES-Go to step 9.

NO-Short to ground in the driver's seat belt tensioner; replace the driver's seat belt.

9. Turn the ignition switch OFF. Disconnect the negative cable from the battery, and wait for 3 minutes.

10. Disconnect both seat belt buckle tensioner 4P connectors (see step 8) and the front passenger's seat belt tensioner 4P connector (see step 7).

11. Disconnect SRS unit connector B (28P) from the SRS unit (see step 9).

12. Disconnect the simulator lead from the floor wire harness.

13. Check resistance between the No.1 terminal of SRS unit connector B (28P) and body ground, and between the No.2 terminal and body ground.

There should be an open circuit (ohmmeter reads OL) or at least 1 M Ω.

Honda CR-V. SRS (Supplemental Restraint System)

Is the resistance as specified? YES-Faulty SRS unit or poor connection at SRS unit connector B (28P) and the SRS unit. Check the connection; if the connection is OK, replace the SRS unit.

NO-Short to ground in the floor wire harness; replace the floor wire harness.

DTC 22-1x ("x" can be 0 thru 9 or A thru F): Open or Increased Resistance in Front Passenger's Seat Belt Tensioner

Special Tools Required

NOTE: Before doing this troubleshooting procedure, review SRS Precautions and Procedures.

1. Erase the DTC memory.

2. Turn the ignition switch ON (II), and check that the SRS indicator comes on for about 6 seconds and then goes off.

Does the SRS indicator stay on, and is DTC 22-1x indicated? YES-Go to step 3.

NO-Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, go to the DTC Troubleshooting Index.

3. Turn the ignition switch OFF. Disconnect the negative cable from the battery, and wait for 3 minutes.

4. Disconnect the floor wire harness 4P connector (A) from the front passenger's seat belt tensioner.

Honda CR-V. SRS (Supplemental Restraint System)

6. Reconnect the negative cable to the battery.

7. Erase the DTC memory.

8. Read the DTC.

Is DTC 22-1x indicated? YES-Go to step 9.

NO-Open or increased resistance in the front passenger's seat belt tensioner; replace the front passenger's seat belt.

9. Turn the ignition switch OFF. Disconnect the negative cable from the battery, and wait for 3 minutes.

10. Disconnect both seat belt buckle tensioner 4P connectors (see step 8) and the driver's seat belt tensioner 4P connector (see step 7 on page 24-24).

11. Disconnect SRS unit connector B (28P) from the SRS unit (see step 9).

12. Check resistance between the No.3 and the No.4 terminals of SRS unit connector B (28P). There should be 2.0-3.0 Ω.

Honda CR-V. SRS (Supplemental Restraint System)

Is the resistance as specified? YES-Faulty SRS unit or poor connection at SRS unit connector B (28P) and the SRS unit. Check the connection; if the connection is OK, replace the SRS unit.

NO-Open or increased resistance in the floor wire harness; replace the floor wire harness.

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