Acura RL. Manual - part 750

Fig. 25: Identifying SH-AWD Control Unit Connector Terminals 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

CONNECTOR TERMINALS REFERENCE CHART 

Terminal 

number

Wire 
color

Signal

Description

Measuring Conditions/Terminal 

Voltage

A1

RED

PLSH

Drives shift solenoid 
(positive)

With solenoid off: about 0 V 
With solenoid on: battery voltage

A2

WHT

NHP

Detects hypoid speed sensor 
signal

With ignition switch ON (II): about 0 V or 
about 5.0 V

A3

ORN

FSR Drives SH-AWD relay

With ignition switch ON (II): about 0 V or 
battery voltage

A4

GRN

LFH

Detects left search coil 
signal (positive)

With ignition switch ON (II): about 2.5 V

A5

BRN

SG

Hypoid gear sensor ground

With ignition switch ON (II): about 0 V

A6

YEL

RFH

Detects right search coil 
signal (positive)

With ignition switch ON (II): about 2.5 V

A8

BLU

STGZ

Detects steering angle sensor 
signal (positive)

With ignition switch ON (II), turn steering 
wheel very slowly: about 0.5 V to 4.5 V

A9

WHT

TOH

Power supply for differential 
fluid temperature sensor

With ignition switch ON (II): about 4.7 V 
to 5.0 V

A10

BLK CANL CAN communication signal

With ignition switch ON (II): about 2.5 V 
or 3.5 V

All

WHT CANH CAN communication signal

With ignition switch ON (II): about 2.5 V 
or 3.5 V

A12

BLK

LG1 Ground

With ignition switch ON (II): about 0 V

A13

BLU

IG1

Power supply for activating 
the system

With ignition switch ON (II): battery 
voltage

A15

LT 

BLU

K-

LINE

Communication line SH-
AWD control unit-to-DLC

With ignition switch ON (II): about 0 V or 
battery voltage

A17

RED

LFL

Detects left search coil 
signal (negative)

With ignition switch ON (II): about 0 V

A18

PNK

SVCC

Power supply for hypoid 
gear sensors

With ignition switch ON (II): about 5.0 V

A19

RED

RFL

Detects right search coil 
signal (negative)

With ignition switch ON (II): about 0 V

A21

PUR

STGB Detects steering angle sensor With ignition switch ON (II), turn steering 

 

2007 Acura RL 

2005-08 DRIVELINE/AXLES Rear Differential - RL

  

me 

 

Friday, June 05, 2009 3:02:18 PM

Page 27 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 26: Identifying SH-AWD Control Unit Connector Terminals 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

CONNECTOR TERMINALS REFERENCE CHART 

CIRCUIT DIAGRAM 

signal

wheel very slowly: about 1.0 V to 4.0 V

A22

GRN STGA

Detects steering angle sensor 
signal

With ignition switch ON (II), turn steering 
wheel very slowly: about 1.0 V to 4.0 V

A23

BLK

TOL

Detects differential fluid 
temperature sensor 
(negative)

With ignition switch ON (II): about 0.2 V 
to 4.7 V (Depending on ATF temperature)

Terminal 

number

Wire 
color

Signal

Description

Measuring Conditions/Terminal 

Voltage

B1

BLU

PWR

Power supply for SH-AWD 
control unit

With ignition switch ON (II): battery 
voltage

B2

BLK

PG Ground

With ignition switch ON (II): about 0 
V

B3

BLK

LG2 Ground

With ignition switch ON (II): about 0 
V

B4

BLU

LCH

Drives left clutch 
electromagnetic coil (negative)

With clutch off: about 0 V With clutch 
on: battery voltage

B5

WHT

LCL

Drives left clutch 
electromagnetic coil (positive)

With ignition switch ON (II): about 0 
V

B6

BLU

RCH

Drives right clutch 
electromagnetic coil (negative)

With clutch off: about 0 V With clutch 
on: battery voltage

B7

RED

RCL

Drives left clutch 
electromagnetic coil (positive)

With ignition switch ON (II): about 0 
V

B8

BRN

PLSL Drives shift solenoid (negative)

With ignition switch ON (II): about 0 
V

 

2007 Acura RL 

2005-08 DRIVELINE/AXLES Rear Differential - RL

  

me 

 

Friday, June 05, 2009 3:02:18 PM

Page 28 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 27: SH-AWD Control Unit - Circuit Diagram (1 Of 2) 
Courtesy of AMERICAN HONDA MOTOR CO., INC.

 

2007 Acura RL 

2005-08 DRIVELINE/AXLES Rear Differential - RL

  

me 

 

Friday, June 05, 2009 3:02:18 PM

Page 29 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 28: SH-AWD Control Unit - Circuit Diagram (2 Of 2) 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

DTC TROUBLESHOOTING 

DTC 12-1,12-2,12-3: LATERAL/LONGITUDINAL ACCELERATION SENSOR MALFUNCTION 

1. Turn the ignition switch ON (II).  

2. Make sure the HDS communicates with the vehicle and the SH-AWD control unit. If it doesn't, 

troubleshoot the DLC circuit; '05-07 models (see '05-07 MODELS ), '08 model (see '08 MODEL ). 

NOTE:

Before you troubleshoot, review the general troubleshooting information 
(see GENERAL TROUBLESHOOTING INFORMATION ).

 

2007 Acura RL 

2005-08 DRIVELINE/AXLES Rear Differential - RL

  

me 

 

Friday, June 05, 2009 3:02:18 PM

Page 30 

© 2005 Mitchell Repair Information Company, LLC.