Module Communications Network: Diagnosis Jaguar XKR II рестайлинг 2

Diagnostic Socket

The diagnostic socket allows the transfer of information between the vehicle electronic control modules and a Jaguar approved diagnostic system. The diagnostic socket is connected directly to both the medium speed controller area network (CAN) bus and the high speed controller area network (CAN) bus and is located below the driver side of the instrument panel.

Ring Break Diagnostics

Incorporated into the auxiliary junction box (AJB) is a RBD (ring break diagnostics) link. The RBD link houses a copper link which when removed initiates the ring break diagnostics mode. The ring break diagnostics mode allows the technician to locate an optical fiber break in the MOST ring. To initiate the ring break diagnostics mode, carry out the following process

1. Connect the Jaguar approved diagnostic system.
2. Ensure the vehicle is in power mode 4 or greater.
3. Remove the RBD link for the length of time specified by the Jaguar approved diagnostic system.
4. Replace the RBD link.

After approximately 30 seconds a diagnostic trouble code (DTC) will be logged in the Information and Entertainment Control Module, identifying the location of the fault. The diagnostic trouble code (DTC) can be read and interrogated using a Jaguar approved diagnostic system.

INSPECTION AND VERIFICATION

1. Verify the customer concern.
2. Visually inspect for obvious signs of electrical damage and system integrity. Electrical Fuses (refer to electrical guide) Wiring harness Correct engagement of electrical connectors Loose or corroded connections 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)
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the cause is not visually evident check for diagnostic trouble codes (DTCs) and refer to the DTC Index.

DTC INDEX

Note. If the control module is suspect and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures manual (section B1.2), or determine if any prior approval program is in operation, prior to the installation of a new module.

Note. Generic scan tools may not read the codes listed, or may read only five digit codes. Match the five digits from the scan tool to the first five digits of the seven digit code listed to identify the fault (the last two digits give additional information read by the manufacturer approved diagnostic system).

Note. When performing electrical voltage or resistance tests, always use a digital multimeter (DMM) accurate to three decimal places, and with an up-to-date calibration certificate. When testing resistance, always take the resistance of the DMM leads into account.

Note. Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

Note. Inspect connectors for signs of water ingress, and pins for damage and/or corrosion.

Note. If DTCs are recorded and, after performing the pinpoint tests, a fault is not present, an intermittent concern may be the cause. Always check for loose connections and corroded terminals.

SYMPTOM CHART

Scheme 13

Note. Items 1, 6, 7, 8 and 9 will always be present. The remaining items are optional and/or market specific.

Overview

The basic guidelines are covered in the description and operation section, such as not attempting to repair fibre optic cables, but additional precautions include

1. Do not touch the exposed ends of the optical fibres (grease from skin can contaminate the fibre)
2. Whenever the fibre optic cable is disconnected, cover the connectors to prevent dust contamination
3. Do not expose the fibre optic cable to heat
4. Do not bend the fibre optic cable through less than a 25 mm (one inch) radius
5. Do not use laser pens to test the fibre optic cable's ability to pass light

MOST Diagnostic Tools

There are two dedicated tools for testing the MOST system

Scheme 14

MOST tester. The MOST tester is connected to the MOST network in place of a control module. It will confirm receipt of any existing MOST signal and transmit it to the next control module on the network. Perform the following tests to validate the operation of the MOST tester. GO to Pinpoint Test A .

Scheme 15

MOST prism. The MOST prism is connected in the same way as the MOST tester but will simply reflect any existing signal onward to the next control module. Using the MOST prism before or after a long run of harness may cause a ring break as a good signal may be too weak after travelling the extended distance. Also, the MOST prism will pass light in either direction so will not detect reversed MOST terminals elsewhere in the network. For these reasons, the MOST tester is the preferred tool and should be used unless limited access does not permit it

MOST Ring Break Indication

A ring break in the MOST network is indicated by a blank touch screen display if the break is before the touch screen display or a flashing logo of the break is after the touch screen display. Possible causes of ring breaks are listed in the symptom chart

PINPOINT TEST A: MOST TESTER TESTS

PINPOINT TEST B: MOST NETWORK INITIAL TESTS

Note. When connecting the MOST tester, use the 2+0 or 2+4 socket as appropriate and set the connector selector switch to match the socket in use

PINPOINT TEST C : MOST NETWORK UPSTREAM TESTS

PINPOINT TEST D : CONTROL MODULE TESTS

Note. When connecting the MOST tester, use the 2+0 or 2+4 socket as appropriate and set the connector selector switch to match the socket in use

Note. The MOST tester may continue to emit a tone or illuminate the LED after the test switch is released. This does not indicate a fault.

PINPOINT TEST E : MOST NETWORK FINAL DOWNSTREAM TEST

PINPOINT TEST F: MOST NETWORK FINAL UPSTREAM TESTS

1. F1: MOST NETWORK FINAL UPSTREAM TEST 1 NOTE: The MOST tester may continue to emit a tone or illuminate the LED after the test switch is released. This does not indicate a fault. Disconnect the MOST harness connector from the touch screen display Connect the MOST tester to the touch screen display using the adapter harness Operate the test switch and check the MOST tester beep/LED Did the MOST tester emit a tone or illuminate the LED? YES: The fault is in the MOST harness between the touch screen display and the succeeding control module. Install a new MOST harness as necessary NO: GO to F 2 .
2. F2: MOST NETWORK FINAL UPSTREAM TEST 2 Reconnect the MOST harness to the touch screen display Check the touch screen display for indication of a MOST network fault Has the MOST network been restored? YES: Tests inconclusive. Repeat the tests from beginning. GO to Pinpoint Test «B»(ref-574781-S36311749862013091700000) . NO: Install a new touch screen display

PINPOINT TEST G: BLANK SCREEN TESTS

PINPOINT TEST H: INFORMATION AND ENTERTAINMENT CONTROL MODULE TESTS

PINPOINT TEST I: TOUCH SCREEN DISPLAY TESTS

Note. If the control module is suspect and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures manual (section B1.2), or determine if any prior approval program is in operation, prior to the installation of a new module.

Note. Generic scan tools may not read the codes listed, or may read only five digit codes. Match the five digits from the scan tool to the first five digits of the seven digit code listed to identify the fault (the last two digits give additional information read by the manufacturer approved diagnostic system).

Note. When performing electrical voltage or resistance tests, always use a digital multimeter (DMM) accurate to three decimal places, and with an up-to-date calibration certificate. When testing resistance, always take the resistance of the DMM leads into account.

Note. Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

Note. Inspect connectors for signs of water ingress, and pins for damage and/or corrosion.

Note. If DTCs are recorded and, after performing the pinpoint tests, a fault is not present, an intermittent concern may be the cause. Always check for loose connections and corroded terminals.