Diagnostic Socket - Defender 2002MY

The diagnostic socket is located below the centre of the fascia. It allows communication to and from off board diagnostic tools, enabling detailed fault diagnosis checks to be carried out. The socket is compliant with SAE directive J1962 standard, and allows attachment of TestBook, T4 or any other diagnostic software and tools.

Operation

Power Distribution

Feed from the positive battery terminal (C0192) is supplied to fusible link 1 of the under seat fuse box (C0632) on an N wire. Fusible link 1 is connected in series with fusible link 2, which is also located in the under seat fuse box. Fusible link 2 (C0570) is connected to fuse 30 of the passenger compartment fuse box (C0595) by an NK wire. Fuse 30 (C0595) provides a constant battery feed to the diagnostic socket (C0040) on a P wire. The diagnostic socket (C0040) is earthed on a pair of B wires.

Diagnostic Socket

The diagnostic socket (C0040) communicates with the following systems:

• The anti-theft alarm ECU (C1979 on LHD, C0061 on RHD) on an LG wire
• The Anti-Lock Braking System (ABS) ECU (C0504) on a K wire (Td5 vehicles only)
• The Engine Control Module (ECM) (C0658) on a K wire (Td5 vehicles only).