Acura RL. Manual - part 126

Fig. 101: Measuring Resistance Between Each Terminal Of SRS Simulator Lead And Body 
Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is the resistance as specified?  

YES - Faulty SRS unit or poor connection at SRS unit connection A (28P) and the SRS unit. Check 
the connection between the connector and the SRS unit. If the connection is OK, replace the SRS unit 
(see SRS UNIT REPLACEMENT ). 

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

DTC 21-1X ("X" CAN BE 0 THRU 9 OR A THRU F): OPEN IN DRIVER'S SEAT BELT 
TENSIONER; DTC 21-2X ("X" CAN BE 0 THRU 9 OR A THRU F): INCREASED 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 21-1x or 21-2x 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. 

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

  

me 

 

Friday, June 05, 2009 2:21:55 PM

Page 88 

© 2005 Mitchell Repair Information Company, LLC. 

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

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 21-1X or 21-2x indicated?  

YES - Go to step 9. 

NO - Open or increased resistance 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. Measure the resistance between the No. 1 and the No. 2 terminals of SRS unit connector B (28P). 

There should be 2.0-3.0 ohms. 

 

2007 Acura RL 

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

  

me 

 

Friday, June 05, 2009 2:21:56 PM

Page 89 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 103: 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 13 

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

C604 (B). 

'05 model  

Fig. 104: 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  

 

2007 Acura RL 

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

  

me 

 

Friday, June 05, 2009 2:21:56 PM

Page 90 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 105: 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. 

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

harness 16P connector C604. There should be 2.0-3.0 ohms. 

:'06-08 models 

Fig. 106: Measuring Resistance Between No. 3 [No. 4] Terminals Of Left Side Wire Harness 16P 
Connector C604 - '05 Models 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Fig. 107: Measuring Resistance Between No. 4 [No. 5] Terminals Of Left Side Wire Harness 16P 
Connector C604 - '06-08 Models 
Courtesy of AMERICAN HONDA MOTOR CO., INC.

 

2007 Acura RL 

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

  

me 

 

Friday, June 05, 2009 2:21:56 PM

Page 91 

© 2005 Mitchell Repair Information Company, LLC.