General
The diagnostic socket is located below the fascia on the drivers side. The connector is constructed to ISO standard and allows the attachment of TestBook/T4 or any other ISO standard scantool.
The diagnostic socket allows diagnostic information stored in any of the ECU's listed below Id be retrieved. It also allows engine tuning and fault diagnosis to be carried out.
Diagnostic Socket Circuit Supply
A feed from the battery positive terminal is connected by an R wire to the engine compartment fusebox, where it passes through fusible link 3.
The feed from fusible link 3 is connected by an NR wire to the passenger compartment fusebox where it passes through fuse 20.
The feed from fuse 20 is connected to the diagnostic socket, via header C0294 by a P wire.
Diagnostic socket earth connection - LHD vehicles
The diagnostic socket is connected to two earth headers C0551 and C0017 by B wires.
Diagnostic socket earth connection - RHD vehicles
The diagnostic socket is connected to earth header C0551 by a B wire. The diagnostic socket is also connected with a B wire through header C0291 to earth header C0017.
Engine Control Module (ECM)
The ECM for V8 and Td5 variants is connected to header C0286 on a K wire. The connection continues from the header C0286 to the diagnostic socket on a K wire.
Body Control Unit (BCU)
The BCU is connected to header C0286 on a K wire. The connection continues from header C0286 to the diagnostic socket on a K wire.
Electronic Automatic Transmission (EAT) ECU
The EAT ECU is connected to header C0286 on a K wire. The connection continues from the header C0286 to the diagnostic socket on a K wire.