Acura RL. Manual - part 146

Fig. 224: Measuring Resistance Between No. 16 And No. 28 Terminals Of SRS Unit Connector 
A (28P) 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is the resistance as specified?  

YES - Go to step 9. 

NO - Short in the engine compartment wire harness or dashboard wire harness A; replace the faulty 
harness. 

9. Measure the resistance between the No. 16 terminal of SRS unit connector A (28P) and body ground, 

and between the No. 28 terminal and body ground. There should be an open circuit or at least 1 
Mohms. 

Fig. 225: Measuring Resistance Between No. 16 [No. 28] Terminal Of SRS Unit Connector A 
(28P) And Body Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is the resistance as specified?  

YES - Go to step 10. 

NO - Short to ground in dashboard wire harness A or engine compartment wire harness; replace the 
faulty harness. 

10. Reconnect the negative cable to the battery.  

11. Turn the ignition switch ON (II).  

 

2007 Acura RL 

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

  

me 

 

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12. Measure the voltage between the No. 16 terminal of SRS unit connector A (28P) and body ground, 

and between the No. 28 terminal and body ground. There should be 1 V or less. 

Fig. 226: Measuring Voltage Between No. 16 [No. 28] Terminal Of SRS Unit Connector A (28P) 
And Body Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is the voltage as specified?  

YES - Go to step 13. 

NO - Short to power in the engine compartment wire harness or dashboard wire harness A; replace 
the faulty harness. 

13. Turn the ignition switch OFF.  

14. Connect the SRS inflator simulator (jumper connector) and simulator lead H to the engine 

compartment wire harness 2P connector (A). 

Fig. 227: Identifying Engine Compartment Right Front Impact Sensor And 2P Connector 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

15. Measure the resistance between the No. 16 and No. 28 terminals of SRS unit connector A (28P). 

There should be 0-1.0 ohms. 

 

2007 Acura RL 

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

  

me 

 

Friday, June 05, 2009 2:21:57 PM

Page 169  © 2005 Mitchell Repair Information Company, LLC. 

Fig. 228: Measuring Resistance Between No. 16 And No. 28 Terminals Of SRS Unit Connector 
A (28P) 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is the resistance as specified?  

YES - Faulty right front impact sensor or SRS unit; replace the right front impact sensor (see FRONT 
IMPACT SENSOR REPLACEMENT ). If the problem is still present, replace the SRS unit (see 
SRS UNIT REPLACEMENT ). 

NO - Open in the engine compartment wire harness or dashboard wire harness A; replace the faulty 
harness. 

DTC 42-CX ("X" CAN BE 0 THRU 9 OR A THRU F): FAULTY POWER SUPPLY TO THE 
RIGHT FRONT IMPACT SENSOR 

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 42-Cx indicated?  

YES - Go to step 3. 

NO - Intermittent failure, 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 engine compartment wire harness 2P connector (A) from the right front impact sensor. 

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 2:21:57 PM

Page 170  © 2005 Mitchell Repair Information Company, LLC. 

Fig. 229: Identifying Engine Compartment Right Front Impact Sensor And 2P Connector 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

5. Disconnect SRS unit connector A (28P) from the SRS unit (see step 7 ).  

6. Measure the resistance between the No. 28 terminal of SRS unit connector A (28P) and body ground. 

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

Fig. 230: Measuring Resistance Between No. 28 Terminal Of SRS Unit Connector A (28P) And 
Body Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is the resistance as specified?  

YES - Go to step 7. 

NO - Short to ground in dashboard wire harness A or engine compartment wire harness; replace the 
faulty harness. 

7. Measure the resistance between the No. 16 and No. 28 terminals of SRS unit connector A (28P). 

There should be an open circuit or at least 1M ohms. 

 

2007 Acura RL 

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

  

me 

 

Friday, June 05, 2009 2:21:57 PM

Page 171  © 2005 Mitchell Repair Information Company, LLC.