General Info; Pin-Out Details; Main Connector; Rf Connector - Bosch CU-304-0503 User Manual

CCU | User Manual

Figure 3 Wiring in iTraMS

5

General Info

• Sensor signal wires should be separated from both actuator signals and ignition switching signals.
• Correct fuse rating as per the system load to be calculated by the OEM and used on Battery positive supply.
• Calculation for their ratings will be responsibility of the customer.
• Twisted pair wires should be used for CAN signals (Figure 3).
• For CCU power ground, multi-point grounding on chassis is recommended.
• Before fixing the ground wires to the chassis of vehicle, paint or any insulating material should be removed and the
surface should be cleaned to ensure proper ground connection.
• Fasteners with serrated washers to be used for fixing the ground cables to chassis.
Wiring
If necessary, wires of type FLR (R = reduced thickness of insulation) must be used.

It is recommended to use constantly insulator copper strands as per DIN 72551 or the newer

automotive norms LV112.
Mechanically unloaded cables can also be connected as wires with reduced thickness of insulation

(FLX or FLKr wiring).
As per DIN 40621, the cables should be laid in a cable protection sleeve.

Wiring harness layout in the vehicle - Sharp edges in the wiring layout should be avoided. The wiring

and primarily the plug connections must be protected against direct water or spray mist.
6

Pin-Out details

The different connectors and their pin-out details are discussed in the below sections

6.1 Main Connector

Pin Number Pin Description
H4 CAN0_Low
H3 CAN0_High
M3 HS Digital-Output 3
L1 Battery Plus
L4 Battery Ground
G4 CAN1_Low
G3 CAN1_High
M1 KL15 (Ignition)

6.2 RF Connector

PIN NO SIGNAL NAME
1 GNSS Antenna Port
2 LTE Main Antenna Port
3 LTE Diversity Antenna Port
Robert Bosch Engineering and Business Solutions Private Limited | September 19, 2020
CCU Pin Label
B_D_CAN0L CAN0 : Low
B_D_CAN0H CAN0 : High
O_S_OUT3 Digital : Output - High Side
V_V_BAT Battery : Positive
G_G_BAT1 Battery : Negative
B_D_CAN1L CAN1 : Low
B_D_CAN1H CAN1 : High
I_S_T15 T15
Remarks
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