Acura RL. Manual - part 401

Is the installation and the frame OK?

YES - Go to step 3. 

NO - Reinstall the components correctly, or replace if damaged, then go to step 3. 

3. Turn the ignition switch ON (II).  

4. Aim the millimeter wave radar unit (see MILLIMETER WAVE RADAR UNIT AIMING ).  

5. Clear the DTCs with the HDS.  

6. Turn the adaptive cruise control (ACC) switch ON.  

7. Watch the ACC and CMBS indicators. 

Do both indicators come on?  

YES - Go to step 8. 

NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections. 

8. Clear the DTCs with the HDS.  

9. Watch the CMBS indicator. 

Does the CMBS indicator come on?  

YES - Go to step 10. 

NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections. 

10. Check for DTCs with the HDS. 

Is DTC 64 indicated?  

YES - Check for loose or poor connections. If OK, replace the ACC unit (see ADAPTIVE CRUISE 
CONTROL (ACC) UNIT REMOVAL/INSTALLATION ). 

NO - Troubleshoot the indicated DTC. 

DTC 100: CMBS INITIAL CHECK INCOMPLETE 

1. Turn the ignition switch ON (II).  

2. Watch the VSA indicator. 

Does the VSA indicator come on?  

NOTE:

The CMBS initial check function checks the communication between the 
adaptive cruise control (ACC) unit and VSA modulator-control unit. If the 
CMBS initial check is incomplete, the ACC and CMBS indicators come on. 
For the CMBS to operate properly, always do the CMBS initial check after 
replacing the ACC unit or the VSA modulator-control unit.

 

2007 Acura RL 

2005-08 BRAKES Collision Mitigation Brake System (CMBS) - RL

  

me 

 

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© 2005 Mitchell Repair Information Company, LLC. 

YES - Troubleshoot the indicated VSA system DTC(s).

NO - Go to step 3. 

3. Check for VSA system DTCs with the HDS. 

Are any DTCs indicated?  

YES - Troubleshoot the indicated VSA system DTC(s). 

NO - Go to step 4. 

4. Start the engine.  

5. Select CMBS from the DRIVING SUPPORT menu, then enter the MISCELLANEOUS TEST.  

6. Do the CMBS brake forced operation.  

7. Watch the ACC and CMBS indicators. 

Do both indicators come on?  

YES - Go to step 8. 

NO - The system is OK at this time. The CMBS initial check is complete. 

8. Check for ACC system DTCs with the HDS. 

Are any DTCs except DTC 100 indicated?  

YES - Troubleshoot the indicated DTC(s). 

NO - Check for loose or poor connections. If OK, replace the ACC unit (see ADAPTIVE CRUISE 
CONTROL (ACC) UNIT REMOVAL/INSTALLATION ). 

DTC 103: CMBS BRAKE CONTROL PROHIBITION 

1. Turn the ignition switch ON (II).  

2. Check for VSA system DTCs with the HDS. 

Are any DTCs indicated?  

YES - Troubleshoot the indicated VSA system DTC(s). 

NO - Go to step 3. 

3. Clear the DTCs with the HDS.  

4. Watch the CMBS indicator. 

Does the CMBS indicator come on?  

YES - Go to step 5. 

 

2007 Acura RL 

2005-08 BRAKES Collision Mitigation Brake System (CMBS) - RL

  

me 

 

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© 2005 Mitchell Repair Information Company, LLC. 

NO - The system is OK at this time. 

5. Check for adaptive cruise control (ACC) system DTCs with the HDS. 

Is DTC 103 indicated?  

YES - Check for loose or poor connections. If OK, replace the ACC unit (see ADAPTIVE CRUISE 
CONTROL (ACC) UNIT REMOVAL/INSTALLATION ). 

NO - Troubleshoot the indicated DTC. 

SYMPTOM TROUBLESHOOTING 

CMBS INDICATOR DOES NOT GO OFF 

1. Turn the ignition switch ON (II).  

2. Press and hold the CMBS OFF switch for a second or more to turn off the system.  

3. Watch the CMBS indicator. 

Does the CMBS indicator go off?  

YES - The system is OK at this time. 

NO - Go to step 4. 

4. Turn the ignition switch OFF.  

5. Connect the HDS to the data link connector.  

6. Clear the DTCs with the HDS.  

7. Turn the ignition switch ON (II).  

8. Check for the adaptive cruise control (ACC) system, VSA, and PCM DTCs with the HDS. 

Are any DTCs indicated?  

YES - Troubleshoot the indicated DTC(s). 

NO - Go to step 9. 

9. Start the engine, and wait for 2 seconds.  

10. Watch the CMBS indicator. 

Does the CMBS indicator stay off?  

YES - The system is OK at this time. 

NO - Go to step 11. 

11. Stop the engine.  

12. Check for ACC system DTCs with the HDS. 

 

2007 Acura RL 

2005-08 BRAKES Collision Mitigation Brake System (CMBS) - RL

  

me 

 

Friday, June 05, 2009 2:59:19 PM

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© 2005 Mitchell Repair Information Company, LLC. 

Are any DTCs indicated?  

YES - Troubleshoot the indicated DTC(s). 

NO - Test the CMBS OFF switch (see CMBS OFF SWITCH TEST/REPLACEMENT ). If the 
switch is OK, do the gauge control module self-diagnostic function (see SELF-DIAGNOSTIC 
FUNCTION ). 

CMBS OFF SWITCH TEST/REPLACEMENT 

1. Remove the instrument fascia (see DRIVER'S SWITCH PANEL REMOVAL/INSTALLATION ). 

2. Remove the screws and the multi-switch (A). 

Fig. 13: Identifying Multi-Switch And Screws 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

3. Check for continuity between the terminals in each CMBS OFF switch position according to the table. 

Fig. 14: CMBS OFF Switch Terminals Reference 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Fig. 15: Identifying CMBS Off Switch 6P Connector 
Courtesy of AMERICAN HONDA MOTOR CO., INC.

 

2007 Acura RL 

2005-08 BRAKES Collision Mitigation Brake System (CMBS) - RL

  

me 

 

Friday, June 05, 2009 2:59:19 PM

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© 2005 Mitchell Repair Information Company, LLC.