Acura RL. Manual - part 399

Fig. 7: CMBS Activation Diagram 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

GAUGE CONTROL MODULE 

When a problem or malfunction is detected, the CMBS indicator comes on. With some problems or 
malfunctions, the condition is displayed on the MID. 

When the CMBS is turned off by the CMBS OFF switch, the CMBS indicator comes on, and the MID 
indicates that the CMBS is off. 

 

2007 Acura RL 

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

  

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© 2005 Mitchell Repair Information Company, LLC. 

Fig. 8: Identifying Gauge Control Module 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

CMBS OFF SWITCH 

The CMBS can be turned off by the CMBS OFF switch on the left side of the dashboard next to the gauge 
control module. (Press and hold the switch for more than a second.) 

Fig. 9: Identifying CMBS OFF Switch 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

ADAPTIVE CRUISE CONTROL (ACC) SYSTEM INPUTS AND OUTPUTS 

 

2007 Acura RL 

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

  

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© 2005 Mitchell Repair Information Company, LLC. 

Fig. 10: Identifying ACC Unit 20P Connector 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

TERMINAL DESCRIPTION CHART 

Terminal 

number

Wire color

Terminal sign Terminal name

Description

Signal

1

RED

BRK DIAG

Brake diagnosis Detects ACC 

relay

ACC system 
brake operated 
or brake pedal 
pressed: battery 
voltage

2

BLU

IG1

Ignition signal

Detects ignition 
signal

Ignition switch 
ON (II): battery 
voltage 
Ignition switch 
OFF: about 0 V

3

GRN

SG

Sensor ground

Sensor ground

-

5

RED

VCC

Voltage 
constant current

Provides sensor 
voltage

Ignition switch 
ON (II): about 5 
V 
Ignition switch 
OFF: about 0 V

6

BLU

PRESS FR

Pressure front 
right

Detects the brake 
fluid pressure 
signal of the right 
front brake 
caliper

Ignition switch 
ON (II): about 
0.5 - 4.5 V 
Ignition switch 
OFF: about 0 V

8

BLU

K-LINE

Data link

Sends and 
receives scan tool 
signal

-

9

BLK

PG

Power ground

Ground circuit 
for the ACC 
system

-

10

WHT

CANH

CAN High line F-CAN 

communication 
(high) circuit

-

11

BLK

LG1

Logic ground 1 Ground circuit 

for the ACC 

-

 

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. 

CIRCUIT DIAGRAM 

system

12

BLK

LG2

Logic ground 2 Ground circuit 

for the ACC 
system

-

13

WHT

VBU

Back-up voltage Provides DTC 

memory voltage

Battery voltage

14

PNK

PRESS FL

Pressure front 
left

Detects the brake 
fluid pressure 
signal of the left 
front brake 
caliper

Ignition switch 
ON (II): about 
0.5 - 4.5 V 
Ignition switch 
OFF: about 0 V

16

BLU

BRK LAMP

Brake light

Drives the ACC 
relay

Ignition switch 
ON (II): battery 
voltage 
Ignition switch 
OFF: about 0 V

17

WHT

IWR TRX

Millimeter wave 
radar data link

Communicates 
with the 
millimeter wave 
radar unit

Ignition switch 
ON (II): battery 
voltage 
Ignition switch 
OFF: about 0 V

20

BLK

CANL

CAN Low line

F-CAN 
communication 
(low) circuit

-

 

2007 Acura RL 

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

  

me 

 

Friday, June 05, 2009 2:59:19 PM

Page 16 

© 2005 Mitchell Repair Information Company, LLC.