Acura RL. Manual - part 127

Is the resistance as specified?

YES - Open or increased resistance in the right side wire harness; replace the right side wire harness.

NO - Open or increased resistance in the left side wire harness; replace the left side 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



SRS inflator simulator 07SAZ-TB4011A



SRS simulator lead F 07XAZ-SZ30100

1. Clear the DTC memory (see CLEAR THE DTC MEMORY WITH THE HDS ).

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, troubleshoot the DTC.

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

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

Fig. 108: Identifying Left Side Wire Harness 4P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

NOTE:

Before doing this troubleshooting procedure, review SRS Precautions and
Procedures (see PRECAUTIONS AND PROCEDURES ) and General
Troubleshooting Information (see GENERAL TROUBLESHOOTING
INFORMATION ).

2007 Acura RL

2005-08 RESTRAINTS SRS (Supplemental Restraint System) - RL

Friday, June 05, 2009 2:21:56 PM

Page 92

5. Connect the SRS inflator simulator (2 ohms connectors) and simulator lead F to the left side wire

harness.

6. Reconnect the negative cable to the battery.

7. Clear the DTC memory.

8. Read the DTC (see GENERAL TROUBLESHOOTING INFORMATION ).

Is DTC 21-3x indicated?

YES - Go to step 9.

NO - Short in the driver's seat belt tensioner; replace the driver's seat belt (see FRONT SEAT BELT
REPLACEMENT ).

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

10. Disconnect the front passenger's seat belt tensioner connector (see step 6 ).

11. Disconnect SRS unit connector B (28P) from the SRS unit (see step 7 ).

12. Disconnect the simulator lead from the left side wire harness.

13. Measure the resistance between the No. 1 and the No. 2 terminals of SRS unit connector B (28P).

There should be an open circuit or at least 1 Mohms.

Fig. 109: Measuring Resistance Between No. 1 And No. 2 Terminals Of SRS Unit Connector B
(28P)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

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 (see SRS UNIT REPLACEMENT ).

NO - Go to step 14.

14. Disconnect right side wire harness 16P connector C604 (A) from the left side wire harness connector

C604 (B).

'05 model

2007 Acura RL

2005-08 RESTRAINTS SRS (Supplemental Restraint System) - RL

Friday, June 05, 2009 2:21:56 PM

Page 93

Fig. 110: Identifying Right Side Wire Harness 16P Connector C604 And Left Side Wire Harness
Connector C604 - '05 Model
Courtesy of AMERICAN HONDA MOTOR CO., INC.

'06-08 models

Fig. 111: Identifying Right Side Wire Harness 16P Connector C604 And Left Side Wire Harness
Connector C604 - '06-08 Model
Courtesy of AMERICAN HONDA MOTOR CO., INC.

15. Measure the resistance between the No. 3 [No. 4] and No. 4 [No. 5] terminals of the right side wire

harness 16P connector C604. There should be an open circuit or at least 1 M ohms.

:'06-08 models

2007 Acura RL

2005-08 RESTRAINTS SRS (Supplemental Restraint System) - RL

Friday, June 05, 2009 2:21:56 PM

Page 94

Fig. 112: Measuring Resistance Between No. 3 [No. 4] Terminals Of Right Side Wire Harness
16P Connector C604 - '05 Models
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig. 113: Measuring Resistance Between No. 4 [No. 5] Terminals Of Right Side Wire Harness
16P Connector C604 - '06-08 Models
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the resistance as specified?

YES - Short in the left side wire harness; replace the left side wire harness.

NO - Short in the right side wire harness; replace the right side 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



SRS inflator simulator 07SAZ-TB4011A



SRS simulator lead F 07XAZ-SZ30100

1. Clear the DTC memory (see CLEAR THE DTC MEMORY WITH THE HDS ).

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, troubleshoot the DTC.

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

NOTE:

2007 Acura RL

2005-08 RESTRAINTS SRS (Supplemental Restraint System) - RL

Friday, June 05, 2009 2:21:56 PM

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