Diagnostic socket

DIAGNOSTIC SOCKET

DESCRIPTION

General

The diagnostic socket is located behind the centre console, and is accessible from the drivers footwell on NAS vehicles, or the passenger footwell on all other vehicle derivatives. The socket is compliant with SAE directive J1962 standard, and allows attachment of TestBook, T4, or any other suitable diagnostic software tool. It allows detailed fault diagnosis checks to be carried out on the vehicle via an ISO 9141 K Line.

OPERATION

General

Feed from the positive battery terminal (C0192) is supplied to fusible link 4 of the engine compartment fuse box (C0632) on an R wire. Fusible link 4 (C0574) is connected to fuse 14 of the passenger compartment fuse box (C0587) by an NW wire. Fuse 14 (C0583) provides a constant battery feed to the diagnostic socket (C0040) on a P wire. The diagnostic socket (C0040) is earthed on a B wire.

The diagnostic socket (C0040) communicates with the following systems and components via the K line on K wires:

The instrument pack (C0230). The Central Control Unit (CCU) (C0429). The ABS ECU (C0500) (01MY vehicles only). The ABS ECU (C0501) (02 MY vehicles only). The SRS DCU (C0256). The cruise control ECU (KV6 ROW vehicles only) (C0239). The Automatic Transmission Control Unit (ATCU) (Td4 and KV6 vehicles only) (C0932). The Engine Control Module (ECM) (KV6 NAS vehicles only) (C0331). The Engine Control Module (ECM) (KV6 ROW vehicles only) (C0371). The ECM (K1.8 vehicles only) (C0913). The ECM (Td4 vehicles only) (C0603). The Fuel Burning Heater (FBH) (Td4 vehicles only) (C0925).

The diagnostic socket (C0040) also communicates with the immobilisation ECU (C0059) via the DS-2 bus on a K wire.