Centre Differential Controller (CDC)
Introduction
The CDC is designed to replace the standard Drivers Control Centre Differential System in a
Subaru Impreza Group N rally car. It is connected to the ABS unit, Steering unit and ECU
on the car. It provides RS232 communications with a PC for setup and data download. It
provides all of the I/O requirements to run the centre differential together with the driver’s
controls and displays.
The CDC has 1MB of logging memory.
Installation
When installing the CDC:
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select a position where the CDC will not be in constant contact with water,
fuel or oil;
make sure that the CDC will not be affected by heat soak;
make sure that air can flow over the CDC to keep it below 85°C;
try not to place the CDC near sources of electrical interference i.e. ignition
coils, plug leads, alternators and telemetry antennas.
WARNING. The engine should always be switched off with the Ignition Switch.
If the engine is stopped using the Master Switch instead of the Ignition Switch,
the 12V supply line to the primary side of the coils and the alternator would be
disconnected from the battery but still be connected to the CDC 12V supply line
via the Ignition Switch, which can damage the CDC. The Master Switch should
always be wired with a shunt resistor.
If a Master Switch is fitted to the car refer to the Master Switch Connection diagram on
page 4.
Product Information 29E-071595-2E
1
Dimensions
105.00 (4.13”)
109.00 (4.29”)
115.00 (4.52”)
Comms connector
32.00
(1.25”)
121.00 (4.76”)
Connector
B
Connector
A
Dimensions in millimetres and (inches)
Specifications
Description
Supply voltage
Supply current
Temperature range
Application Software
Environmental
Ordering information
Value
+11.0V to +26.0V
0.6A
0°C to +85°C
DESCPRO,
ECU Offload Tool and
Pi Toolbox
IP67
Product
Part number
Centre Differential Controller (CDC) 01E-500380
Connector information
Comms connector
Connector
Lemo EEA-1B-307-CLV
Mating connector
Lemo PFA-1B-307
Comms connector pinout details
Pin
1
2
3
4
2
Product Information 29E-071595-2E
Function
Ground
12V
CAN High
CAN Low
Pin
5
6
7
Function
RX232
TX232
Ground
Main connector information
1
9
1
9
10
18 10
18
19
24 19
24
Connector B
Connector A
Main connector viewed from the front of the box
Connector B
Pin
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
B13
B14
B15
B16
B17
B18
B19
B20
B21
B22
B23
B24
Description
Centre Diff Motor To ECU PWM (RLA9)
Switched Power for Diff Motor
Switched Power for Diff Motor
Supply V12
Supply V12
Centre Diff Lamp Full Open (RLA1)
Centre Diff Lamp 1 (RLA2)
Centre Diff Lamp 2 (RLA3)
Centre Diff Lamp 3 (RLA4)
No connection
Supply V12 Monitor
Ground
Auto / Manual SW Ground
Ground for Thumb wheel
Centre Diff Lamp 4 (RLA5)
Centre Diff Lamp Full Lock (RLA6)
Centre Diff Lamp Auto Mode (RLA7)
Power signal for Centre Diff relay (RLA8)
Switched Power for Diff Motor
Ground
Ground
No connection
No connection
No connection
Connector A
Pin
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
A24
Description
RS232 RX
RS232 TX
No connection
RPM (SW3)
Handbrake SW (SW1)
Foot Brake SW (SW4)
Thumb Wheel SW (AN1)
TPS (AN4)
ACC signal (AN5)
CAN High
No connection
No connection
Spare (SW5)
Rear Diff temp (AN2)
Auto / Manual SW (SW2)
No connection
Yaw Ground
Yaw Signal (AN6)
CAN Low
5V for Thumb wheel
Yaw 12V
Spare (RLA0)
Ground
Yaw 2.5V (AN0)
Product Information 29E-071595-2E
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Engine
Ground
Engine
Ground
Chassis
Ground
ECU
Battery
Alternator
Shunt Resistor
3 ohms, 11 Watt
Chassis
Ground
Starter Motor
Master
Switch
To Main Power Relay
To Pins B4 and B5
Engine
Ground
Cut the wire between the main power relay and
Pins B4 and B5 on the Subaru standard loom and use the
Master Switch as shown to kill the engine.
Master Switch Connection
4
Product Information 29E-071595-2E