Acura RL. Manual - part 397

Extensive driving on a rough road or the ignition switch is turned ON (ID/OFF.

DTC 102: ACC indicator does not come on, CMBS indicator comes on 

Parking brake not fully released, or driving with the parking brake stuck. 

HOW TO RETRIEVE DTCS 

1. With the ignition switch OFF, connect the HDS to the data link connector (DLC) (A) under the left 

side of the dashboard. 

Fig. 4: Identifying HDS To Data Link Connector (DLC) 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

2. Turn the ignition switch ON (II).  

3. Make sure the HDS communicates with the vehicle and the ACC unit. If it does not communicate, 

troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ).  

4. Follow the prompts on the HDS to display the DTC(s) on the screen. After determining the DTC, 

refer to the DTC TROUBLESHOOTING. 

HOW TO CLEAR DTCS 

1. With the ignition switch OFF, connect the HDS to the data link connector (DLC) (A) under the left 

side of the dashboard. 

NOTE:

See the HDS Help menu for specific instructions.

NOTE:

You cannot clear the DTCs manually.

 

2007 Acura RL 

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

  

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Fig. 5: Identifying HDS To Data Link Connector (DLC) 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

2. Turn the ignition switch ON (II).  

3. Make sure the HDS communicates with the vehicle and the ACC unit. If it does not communicate, 

troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ).  

4. Clear the DTC(s) by following the screen prompts on the HDS. 

DTC TROUBLESHOOTING INDEX 

DTC TROUBLESHOOTING INDEX 

NOTE:



See the HDS Help menu for specific instructions.  



Some DTCs cannot be cleared until the radar aiming is complete. 

DTC

Detection Item

Adaptive Cruise 

Control (ACC) 

Indicator

CMBS Indicator

11 

Left rear wheel sensor 
problem

o

o

12 

Right rear wheel sensor 
problem

o

o

13 

Left front wheel sensor 
problem

o

o

14 

Right front wheel sensor 
problem

o

o

20

Steering angle sensor 
malfunction

-

o

21 

Yaw rate-
lateral/longitudinal 
acceleration sensor 
malfunction

o

o

22 

Yaw rate-
lateral/longitudinal 
acceleration sensor center 
position revision value 

o

o

 

2007 Acura RL 

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

  

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Friday, June 05, 2009 2:59:19 PM

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© 2005 Mitchell Repair Information Company, LLC. 

error

23 

Yaw rate-
lateral/longitudinal 
acceleration sensor gain 
error

o

o

25 

Yaw rate-
lateral/longitudinal 
acceleration sensor 
stabilizing malfunction

o

o

30 

Adaptive cruise control 
(ACC) relay circuit 
malfunction

o

o

34

Master cylinder brake 
fluid pressure sensor 
circuit open/short

-

o

35

Master cylinder brake 
fluid pressure sensor 
center position error

-

o

36

Master cylinder brake 
fluid pressure sensor shift 
error

-

o

60 

Communication line error

o

o

61 

Millimeter wave radar 
unit communication error

o

o

62 

Millimeter wave radar 
sensor error

o

o

63 

Millimeter wave radar 
unit aiming error

o

o

64

CMBS operation error 
(excessive operation)

-

o

88

Millimeter wave radar out 
of detection area

-

o

90 

A/T system and/or PGM-
FI system malfunction

-

o

95

Power supply voltage too 
high

-

o

96

Power supply voltage too 
low

-

o

97

CMBS offset cancel 
timeout

-

o

100

CMBS initial check 
incomplete

o

o

102

CMBS parking brake 
incomplete releasing

-

o

103

CMBS brake control 
prohibition

-

o

105 

Dust or dirt on the 
millimeter wave radar unit

-

o

 

2007 Acura RL 

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

  

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© 2005 Mitchell Repair Information Company, LLC. 

SYMPTOM TROUBLESHOOTING INDEX 

TROUBLESHOOTING CHART 

107 

Millimeter wave radar 
unit aiming incomplete

o

o

110 

Lost communication with 
the PCM (PGM-FI 
system)

-

o

111 

Lost communication with 
the PCM (A/T system)

-

o

112 

Lost communication with 
the VSA modulator-
control unit

-

o

113 

Lost communication with 
the gauge control module

-

o

115 

Lost communication with 
the SH-AWD control unit

-

o

NOTE:

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

Symptom

Diagnostic procedure

Also check for

CMBS OFF switch does not 
turn on/turn off (CMBS 
indicator does not change)

1. Adaptive cruise control 

(ACC) system 
troubleshooting (No DTC 
Indication) (see ADAPTIVE 
CRUISE CONTROL (ACC) 
SYSTEM 
TROUBLESHOOTING 
(NO DTC INDICATION) ). 

2. Test the CMBS OFF switch 

(see CMBS OFF SWITCH 
TEST/REPLACEMENT ).  

3. Do the gauge control module 

self-diagnostic function (see 
SELF-DIAGNOSTIC 
FUNCTION ).  



An open in the wire  



A short in the wire  

The MID does not indicate 
when the CMBS OFF switch is 
operated

1. Adaptive cruise control 

(ACC) system 
troubleshooting (No DTC 
Indication) (see ADAPTIVE 
CRUISE CONTROL (ACC) 
SYSTEM 
TROUBLESHOOTING 
(NO DTC INDICATION) ). 

2. Test the CMBS OFF switch 

(see CMBS OFF SWITCH 



An open in the wire  



A short in the wire  

 

2007 Acura RL 

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

  

me 

 

Friday, June 05, 2009 2:59:19 PM

Page 8 

© 2005 Mitchell Repair Information Company, LLC.