Acura RL. Manual - part 396

2005-08 BRAKES

Collision Mitigation Brake System (CMBS) - RL

COMPONENT LOCATION INDEX

Fig. 1: Identifying Collision Mitigation Brake System Component Location (1 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

2007 Acura RL

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

2007 Acura RL

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

Friday, June 05, 2009 2:59:19 PM

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Friday, June 05, 2009 2:59:23 PM

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Fig. 2: Identifying Collision Mitigation Brake System Component Location (2 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

GENERAL TROUBLESHOOTING INFORMATION

CMBS INDICATOR

If the system is OK, the CMBS indicator goes off 2 seconds after turning the ignition switch ON (II). The
CMBS indicator comes on when the adaptive cruise control (ACC) unit detects a problem in the system.

NOTE:



The ACC indicator indicates problems related with the ACC system and
the CMBS.

2007 Acura RL

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

Friday, June 05, 2009 2:59:19 PM

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When a problem is detected by the self-diagnostic function, the CMBS stops operating, turns on the CMBS
indicator, indicates the problem on the MID, and stores the DTC.

CMBS OFF SWITCH

Press and hold the CMBS OFF switch for at least a second to turn the CMBS off and on.

CMBS INDICATION



If the system is OK, the CMBS indicator comes on for 5 seconds after turning the ignition switch ON
(II) with the CMBS OFF switch on.



When the system is activated, the word "BRAKE" is indicated on the MID and the warning buzzer
sounds.



First stage, BRAKE indicator and buzzer



Second stage, BRAKE indicator, buzzer, light braking, and light seat belt tension



Third stage, BRAKE indicator, buzzer, strong braking, and strong seat belt tension



If the system stops operating because of a problem, the MID indicates the problem.

ADAPTIVE CRUISE CONTROL (ACC) UNIT

The ACC unit controls the brake and warning when the system recognizes the danger of a collision. The
ACC unit has a self-diagnostic function. If the system detects a problem, it stops the CMBS, and turns on
the CMBS indicator.

CMBS INITIAL CHECK

The ACC unit turns on the CMBS indicator if the CMBS initial check is not completed.



The CMBS indicator only indicates its system problems.



The CMBS works with related systems such as the VSA system. If these
related systems have a problem, the CMBS does not operate. In this
case, the CMBS indicator and the related system indicator come on.

Fig. 3: Identifying CMBS Indicator And MID
Courtesy of AMERICAN HONDA MOTOR CO., INC.

2007 Acura RL

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

Friday, June 05, 2009 2:59:19 PM

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MILLIMETER WAVE RADAR UNIT

The millimeter wave radar unit recognizes the position of the vehicle running ahead and detects the two
vehicles speed differential.

The ACC unit receives this information from the millimeter wave radar unit.

The millimeter wave radar unit also has an error detect function, and sends a signal to the ACC unit if an
error is detected.

HOW TO TROUBLESHOOT DTCS

Check and clear the DTCs with the HDS.

Before troubleshooting, check and note these items:



Ask the client about the conditions when the problem occurred, and try to reproduce the same
conditions for troubleshooting.



If the symptom does not appear and the CMBS indicator does not come on during the test-drive, but
troubleshooting is done based on the DTC, check for poor connections or loose terminals at all
connectors related to the circuit that you are troubleshooting.



After the troubleshooting or repairs are done, clear the DTCs, and test-drive the vehicle under the
same conditions as when the DTC was originally.



The ACC system and the CMBS may sometimes stop working because of the environment (weather,
road conditions, driving conditions, etc.). A DTC may be stored in these cases.

DTCs that may be stored even when the system is normal:

DTC 88: ACC indicator does not come on, CMBS indicator comes on

The millimeter wave radar unit overheats, the power supply voltage for the millimeter wave radar unit is
low, or there is a communication error between the ACC unit and the millimeter wave radar unit.

DTC 95: ACC indicator does not come on, CMBS indicator comes on

Battery voltage is too high.

DTC 96: ACC indicator does not come on, CMBS indicator comes on

Battery voltage is too low.

DTC 97: ACC indicator does not come on, CMBS indicator comes on

NOTE:

For proper CMBS operation, if the ACC unit or the VSA modulator-control
unit is replaced, do the CMBS initial check incomplete troubleshooting (DTC
100) (see DTC 100: CMBS INITIAL CHECK INCOMPLETE ).

NOTE:

When both the ACC and CMBS indicators come on, do the ACC system
troubleshooting first (except DTC 100).

2007 Acura RL

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

Friday, June 05, 2009 2:59:19 PM

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