Jaguar XJ (X350). Service manual — part 1336

9

—

Compact disc changer

10

—

High intensity discharge headlamp module (HID)

Diagnosis and testing

Communications Network

Principles of Operation

There are three module communication networks connected to the data link connector (DLC),

controller area network, (CAN), standard corporate protocol (SCP), and international standards

organisation (ISO). CAN and SCP are unshielded twisted pair cable; data bus + and data bus -, while

ISO is a single wire system. The networks can be connected to the Jaguar approved diagnostic system

or scan tool by the DLC.

The SCP communication network remains operational even with the severing of one of the bus wires.

Communications will also continue if one of the bus wires is shorted to ground or battery positive

voltage (B+), or if some, but not all, termination resistors are lost.

The ISO network, however, will not function if the circuit is damaged.

The fourth module communication network is domestic data bus (D2B), which is a fibre optic

system.

The D2B network is diagnosed from the ICE head unit via the SCP network for DTCs, and by the use of

the optical bus tester for diagnosis of the optical ring.

Modules may log DTCs if power supply or ground is interrupted. Supply and ground tests are in this

section under the DTC number flagged, or by module name in the power supply and ground table.

The instrument cluster (also known as an instrument cluster module or ICM) is connected to the CAN

and SCP communication networks, and forms a "gateway" between the networks. The networks

share information, allowing sensors to serve more than one network.

Inspection and Verification

1 . Verify the customer concern.

2 . Confirm which, if any, warning lights and/or messages were displayed on the instrument cluster.

NOTE:

If any warning lights and/or messages were displayed when the fault occurred, refer to the

driver information table for DTCs associated with the display, then to the DTC index table for

possible sources and actions. Some warnings will appear to clear when the ignition is cycled. This

is often because the warning has flagged as a result of one of the vehicle's on-board diagnostic

routines having run to detect the fault. If the same routine is not run when the ignition is

switched ON, the warning will not reflag until the routine does run. See the DTC summaries for

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drive cycle routines.

3 . Visually inspect for obvious signs of mechanical or electrical damage.

Electrical

General

•

Fuses (see table)

•

Wiring harness

•

Correct engagement of electrical connectors

•

Loose or corroded connections

Controller area network (CAN)

•

Instrument cluster (IC)

•

J-Gate module (JGM)

•

Air conditioning control module (A/CCM)

•

Dynamic stability control control module (DSCCM)

•

Engine control module (ECM)

•

Transmission control module (TCM)

•

Adaptive speed control control module (ASCCM)

•

Yaw rate sensor

•

Rear climate control panel (RCCP)

•

Air suspension control module (ASU)

Standard corporate protocol (SCP)

•

Instrument cluster (IC)

•

ICE head unit (HU)

•

Rear electronic module (REM)

•

Front electronic module (FEM)

•

Rear memory module (RMM)

•

Navigation module (NAV)

•

Steering column lock module (SCLM)

•

Electronic park brake module (EPB)

•

Driver door control module (DDCM)

•

Driver seat control module (DSCM)

International standards organisation (ISO)

•

Engine control module (ECM)

•

Parking aid control module (PACM)

•

Intrusion sensor

•

Restraints control module (RCM)

•

Left-hand high intensity discharge headlamp assembly (HID)

•

Right-hand high intensity discharge headlamp assembly (HID)

Domestic data bus (D2B)

•

Routing of fibre optic harnesses

•

Correct engagement of optical connectors

•

Correct placement of optical connectors (ring order)

•

Correct assembly of optical connectors (backout, etc)

•

Damage to fibre (chafing, abrasion, kinking, cuts, etc)

•

ICE head unit (HU)

•

Compact disc changer (CD)

•

Cellular phone module (CPM)

•

Voice module (VACM)

•

Rear entertainment system

•

Navigation system module (NSM)

•

Amplifier (AMP)

Fuse Rating

Circuit

Location

43

5 Amp

Diagnostic connector (battery)

Primary junction

box

16

5 Amp

Diagnostic connector (ignition)

Primary junction

box

11

5 Amp

ICE head unit

Primary junction

box

34

5 Amp

Navigation

Primary junction

box

08

5 Amp

Instrument cluster

Primary junction

box

20

5 Amp

Cellular phone module, voice, VICS (Japan), rear entertainment

system

Primary junction

box

15

5 Amp

Front electronic module, engine control module, instrument

cluster

Primary junction

box

29

10

Amp

Restraints control module

Primary junction

box

02

5 Amp

Adaptive speed control control module

Primary junction

box

08

10

Air conditioning control module

Primary junction

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