RING BREAK DIAGNOSTICS
Incorporated into the Auxiliary Junction Box (AJB) is a Ring Break Diagnostics (RBD) 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
- Connect the Land Rover approved diagnostic system.
- Ensure the vehicle is in power mode 4 or greater.
- Remove the RBD link for the length of time specified by the Land Rover approved diagnostic system.
- Replace the RBD link.
After approximately 30 seconds a Diagnostic Trouble Code (DTC) will be logged in the Integrated Control Module, identifying the location of the fault. The DTC can be read and interrogated using the Land Rover approved diagnostic system.
Scheme 1
Scheme 1: CONTROL DIAGRAM - LIN BUS (SHEET 1 OF 2)
| Item Number | Description |
|---|
| 1 | Driver door module |
| 2 | Driver door switch pack |
| 3 | Rear door module (driver side) |
| 4 | Start control module |
| 5 | Electronic steering column lock |
| 6 | Rear door module (passenger side) |
| 7 | Passenger door module |
| 8 | Rain sensor |
| 9 | Battery backed sounder |
| 10 | Intrusion detection module |
| 11 | CJB |
| 12 | Steering wheel module |
| 13 | Light switch module |
| 14 | Radio Frequency (RF) receiver |
Scheme 2
Scheme 2: CONTROL DIAGRAM - LIN BUS (SHEET 2 OF 2)
| Item Number | Description |
|---|
| 1 | Headlamp leveling control module |
| 2 | Generator control module |
| 3 | Selector lever module |
| 4 | Transmission Control Module (TCM) |
| 5 | Cabin humidity sensor |
| 6 | Air intake stepper motor |
| 7 | Windshield distribution (defrost) stepper motor |
| 8 | Right Hand (RH) temperature blend stepper motor |
| 9 | RH seat heat module |
| 10 | Automatic Temperature Control (ATC) module |
| 11 | Left Hand (LH) seat heat module |
| 12 | LH temperature blend stepper motor |
| 13 | Face/feet stepper distribution motor |
| 14 | RH headlamp control module |
| 15 | LH headlamp control module |
| 16 | Engine Control Module (ECM) |
Scheme 3
Scheme 3: CONTROL DIAGRAM - MEDIUM SPEED CAN BUS
| Item Number | Description |
|---|
| 1 | CJB |
| 2 | ATC module |
| 3 | Instrument cluster (Intelligent Drivers Module) |
| 4 | Trailer module |
| 5 | Driver door module |
| 6 | Fuel fired booster heater |
| 7 | Passenger door module |
| 8 | Seat memory module |
| 9 | Integrated head unit/Integrated control module - Low line audio |
| 10 | Integrated control module - High line audio |
| 11 | Parking aid module |
| 12 | Diagnostic socket |
Note. N = Medium speed CAN bus
Scheme 4
Scheme 4: CONTROL DIAGRAM - HIGH SPEED CAN BUS
| Item Number | Description |
|---|
| 1 | CJB |
| 2 | Diagnostic socket |
| 3 | Restraints Control Module (RCM) |
| 4 | Steering wheel angle sensor |
| 5 | Occupant classification sensor - North American Specification (NAS) vehicles only |
| 6 | Electronic rear differential control module |
| 7 | TCM |
| 8 | Headlamp leveling control module |
| 9 | Terrain Response control module |
| 10 | Anti-lock Brake System (ABS) module |
| 11 | ECM - TD4 |
| 12 | ECM - i6 |
Note. D = High speed CAN bus
Scheme 5
Scheme 5: CONTROL DIAGRAM - MOST
| Item Number | Description |
|---|
| 1 | Integrated control module |
| 2 | Integrated head unit |
| 3 | High Definition (HD) radio module (NAS only from 2009MY) |
| 4 | Digital Audio Broadcast (DAB) receiver / Satellite Digital Audio Radio System (SDARS) (NAS only from 2009MY) receiver |
| 5 | Bluetooth telephone module |
| 6 | Amplifier |
| 7 | Satellite navigation computer |
| 8 | Touch Screen Display (TSD) |
INSPECTION AND VERIFICATION
| CAUTION | Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does not guarantee confirmation of a fault, and may also cause additional faults in the vehicle being tested and/or the donor vehicle. |
- Verify the customer concern.
- Visually inspect for obvious signs of mechanical or electrical damage and system integrity. VISUAL INSPECTION Mechanical Electrical Stuck switch(s) Electric Steering Column Lock (ESCL) Transponder Key Fuse(s) (refer to electrical guide) Relay(s) Wiring harness(es) Correct engagement of electrical connectors Loose or corroded connections Backed out connector pins Local Interconnect Network (LIN) bus Controller Area Network (CAN) bus Correct placement of optical connectors (ring order) Correct assembly of optical connectors (backout, etc) Correct engagement of optical connectors Damage to fibre optical cable(chafing, abrasion, kinking, cuts, etc)
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step
- If the cause is not visually evident, check for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index.
SYMPTOM CHART
| Symptom | Possible Causes | Action |
|---|
| MOST network fault - Touch screen display displaying flashing logo | MOST ring broken after the touch screen display Control module on MOST network power or ground circuit open circuit, high resistance Control module on MOST network internal failure | GO to Pinpoint Test B. |
| MOST network fault - Touch screen display blank | MOST ring broken between the information and entertainment control module and the touch screen display Information and entertainment control module or touch screen display power or ground circuit open circuit, high resistance Wake up signal not received by the information and entertainment control module Information and entertainment control module or touch screen display internal failure | GO to Pinpoint Test. |
PINPOINT TEST A: MOST TESTER TESTS
| Test Conditions | DETAILS/RESULTS/ACTIONS |
|---|
| A1: MOST TESTER BATTERY TEST |
| 1. Set the MOST tester power switch to 'on' |
| Is the power LED illuminated? Yes Test passed. GO to A2. No Test failed. Install a new battery into the MOST tester. GO to A1. |
| A2: MOST TESTER BATTERY TEST |
| NOTE: '2+0' indicates that the loop harness connector consists of 2 fibre optic terminals and 0 electrical terminals. |
| 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. |
| 1. Set the MOST tester power switch to 'on' |
| 2. Set the connector selector switch to '2+0' |
| 3. Set the indication switch to 'beep' or 'LED' |
| 4. Remove the covers from the MOST tester 2+0 connector and the 2+0 loop harness connector |
| 5. Connect the 2+0 loop harness to the MOST tester 2+0 connector |
| 6. Operate the test switch and check the MOST tester beep/LED |
| Did the MOST tester emit a tone or illuminate the LED? Yes Test passed. GO to A3. No Test failed. MOST tester or 2+0 harness faultTest failed. Install a new battery into the MOST tester. GO to A1. |
| A3: 2+4 INPUT/OUTPUT TEST |
| NOTE: '2+4' indicates that the loop harness connector consists of 2 fibre optic terminals and 4 electrical terminals. |
| 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. |
| 1. Set the MOST tester power switch to 'on' |
| 2. Set the connector selector switch to '2+4' |
| 3. Set the indication switch to 'beep' or 'LED' |
| 4. Remove the covers from the MOST tester 2+4 connector and the 2+4 loop harness connector |
| 5. Connect the 2+4 loop harness to the MOST tester 2+4 connector |
| 6. Operate the test switch and check the MOST tester beep/LED |
| Did the MOST tester emit a tone or illuminate the LED? Yes Test passed. GO to A4. No Test failed. MOST tester or 2+4 harness fault |
| A4: ADAPTER HARNESS AND PRISM TEST |
| 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. |
| 1. Set the MOST tester power switch to 'on' |
| 2. Set the connector selector switch to '2+0' |
| 3. Set the indication switch to 'beep' or 'LED' |
| 4. Remove the covers from the MOST tester 2+0 connector, the prism, and the adapter harness connectors |
| 5. Connect the adapter harness to the MOST tester 2+0 connector |
| 6. Connect the prism to the adapter harness |
| 7. Operate the test switch and check the MOST tester beep/LED |
| Did the MOST tester emit a tone or illuminate the LED? Yes Test passed. No Test failed. MOST tester, adapter harness or prism fault |
| NOTE |
|---|
| '2+0' indicates that the loop harness connector consists of 2 fibre optic terminals and 0 electrical terminals. |
| 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. |
| NOTE |
|---|
| '2+4' indicates that the loop harness connector consists of 2 fibre optic terminals and 4 electrical terminals. |
| 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. |
| 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 B: MOST NETWORK INITIAL TESTS
| TEST CONDITIONS | DETAILS/RESULTS/ACTIONS |
|---|
| B1: MOST NETWORK INITIAL TEST 1 |
| 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 |
| 1. Switch on the audio/video system |
| 2. Disconnect the MOST harness connector from the power amplifier |
| 3. Set the MOST tester power switch to 'on' |
| 4. Connect the MOST harness connector to the MOST tester |
| 5. Check the touch screen display for indication of a MOST network fault |
| Has the MOST network been restored? Yes The disconnected control module is causing the MOST network fault. GO to PINPOINT TEST E : CONTROL MODULE TESTS . No The disconnected control module is not causing MOST network fault. GO to B2. |
| B2: MOST NETWORK INITIAL TEST 2 |
| 1. Check the MOST tester beep/LED |
| Did the MOST tester emit a tone or illuminate the LED? Yes MOST signal received. The MOST network fault is located downstream of the MOST tester. GO to PINPOINT TEST C : MOST NETWORK DOWNSTREAM TESTS . No MOST signal not received. The MOST network fault is located upstream of the MOST tester. Disconnect the MOST harness connector from the MOST tester and reconnect it to the control module. GO to PINPOINT TEST D : MOST NETWORK UPSTREAM 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 DOWNSTREAM TESTS
| Test Conditions | DETAILS/RESULTS/ACTIONS |
|---|
| C1: MOST NETWORK DOWNSTREAM TEST 1 |
| 1. Refer to the electrical circuit diagrams and identify the succeeding control module on the MOST network |
| Is this control module the information and entertainment control module? Yes GO to PINPOINT TEST F : MOST NETWORK FINAL DOWNSTREAM TEST . No GO to C2. |
| C2: MOST NETWORK DOWNSTREAM TEST 2 |
| 1. Disconnect the MOST harness connector |
| 2. Direct the MOST harness connector at a suitable surface and check for the presence of red light |
| Is red light present? Yes Disconnect the MOST harness connector from the MOST tester and reconnect it to the control module. GO to C3. No The fault is in the MOST harness between the MOST tester and the disconnected MOST harness connector. Install a new MOST harness as necessary |
| C3: MOST NETWORK DOWNSTREAM TEST 3 |
| 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 '2+4' indicates that the loop harness connector consists of 2 fibre optic terminals and 4 electrical terminals. |
| 1. Connect the succeeding MOST harness connector to the MOST tester |
| 2. Check the touch screen display for indication of a MOST network fault |
| Has the MOST network been restored? Yes The disconnected control module is causing the MOST network fault. GO to PINPOINT TEST E : CONTROL MODULE TESTS . No The disconnected control module is not causing the MOST network fault. GO to C1. |
| 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 '2+4' indicates that the loop harness connector consists of 2 fibre optic terminals and 4 electrical terminals. |
PINPOINT TEST D: MOST NETWORK UPSTREAM TESTS
| Test Conditions | DETAILS/RESULTS/ACTIONS |
|---|
| D1: MOST NETWORK UPSTREAM TEST 1 |
| 1. Refer to the electrical circuit diagrams and identify the preceding control module on the MOST network |
| Is this control module the touch screen display? Yes GO to PINPOINT TEST G : MOST NETWORK FINAL UPSTREAM TESTS . No GO to D2. |
| D2: MOST NETWORK UPSTREAM TEST 2 |
| 1. Disconnect the MOST harness connector from the control module |
| 2. Direct the MOST harness connector at a suitable surface and check for the presence of red light |
| Is red light present? Yes The MOST network fault is in the control module or the MOST harness to the succeeding control module. GO to D3. No The MOST network fault is located upstream of the disconnected control module. Reconnect the MOST harness connector to the control module. GO to D1. |
| D3: MOST NETWORK UPSTREAM TEST 3 |
| 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 |
| 1. Connect the MOST harness connector to the MOST tester |
| 2. Check the touch screen display for indication of a MOST network fault |
| Has the MOST network been restored? Yes The disconnected control module is causing the MOST network fault. GO to PINPOINT TEST E : CONTROL MODULE TESTS . No The fault is in the MOST harness between the MOST tester and the succeeding control module. Install a new MOST harness as necessary |
| 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 E: CONTROL MODULE TESTS
| Test Conditions | DETAILS/RESULTS/ACTIONS |
|---|
| E1: CONTROL MODULE TEST 1 |
| 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. |
| 1. Connect the MOST tester to the relevant control module using the adapter harness |
| 2. Operate the test switch and check the MOST tester beep/LED |
| Did the MOST tester emit a tone or illuminate the LED? Yes MOST signal received. Tests inconclusive. Reconnect the MOST harness connector to the control module and confirm that the MOST network fault is still present. Repeat the tests from the beginning. GO to PINPOINT TEST B : MOST NETWORK INITIAL TESTS . No GO to E2. |
| E2: CONTROL MODULE TEST 2 |
| 1. Refer to the electrical circuit diagrams and test the relevant control module power and ground circuits for open circuit, high resistance |
| Are the power and ground circuits within specification? Yes GO to E3. No Repair the power and/or ground circuit |
| E3: CONTROL MODULE TEST 3 |
| 1. Reconnect the MOST harness to the control module |
| 2. 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 the beginning. GO to PINPOINT TEST B : MOST NETWORK INITIAL TESTS . No Install a new control module |
| 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 F: MOST NETWORK FINAL DOWNSTREAM TEST
| Test Conditions | DETAILS/RESULTS/ACTIONS |
|---|
| F1: MOST NETWORK FINAL DOWNSTREAM TEST 11 |
| 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. |
| 1. Disconnect the MOST harness connector from the MOST tester |
| 2. Reconnect the MOST harness connector to the control module |
| 3. Disconnect the MOST harness connector from the information and entertainment control module |
| 4. Connect the MOST harness connector to the MOST tester |
| 5. Operate the test switch and check the MOST tester beep/LED |
| Did the MOST tester emit a tone or illuminate the LED? Yes GO to F2. No The fault is in the harness between the information and entertainment control module and the preceding control module. Install a new MOST harness as necessary |
| F2: MOST NETWORK FINAL DOWNSTREAM TEST 2 |
| 1. Disconnect the MOST harness connector from the MOST tester |
| 2. Reconnect the MOST harness connector to the information and entertainment control module |
| 3. 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 the beginning. GO to PINPOINT TEST B : MOST NETWORK INITIAL TESTS . No Install a new information and entertainment control module |
| 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 G: MOST NETWORK FINAL UPSTREAM TESTS
| Test Conditions | DETAILS/RESULTS/ACTIONS |
|---|
| G1: 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. |
| 1. Disconnect the MOST harness connector from the touch screen display |
| 2. Connect the MOST tester to the touch screen display using the adapter harness |
| 3. 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 G2. |
| G2: MOST NETWORK FINAL UPSTREAM TEST 2 |
| 1. Reconnect the MOST harness to the touch screen display |
| 2. 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 the beginning. GO to PINPOINT TEST B : MOST NETWORK INITIAL TESTS . No Install a new touch screen display |
| 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 H: BLANK SCREEN TESTS
| Test Conditions | DETAILS/RESULTS/ACTIONS |
|---|
| H1: BLANK SCREEN TEST 1 |
| 1. Disconnect the MOST harness connector from the touch screen display |
| 2. Direct the MOST harness connector at a suitable surface and check for the presence of red light |
| Is red light present? Yes GO to PINPOINT TEST J : TOUCH SCREEN DISPLAY TESTS . No GO to H2. |
| H2: BLANK SCREEN TEST 2 |
| 1. Disconnect the MOST harness connector from the information and entertainment control module |
| 2. Direct the information and entertainment control module at a suitable surface and check for the presence of red light |
| Is red light present? Yes Install a new MOST harness between the information and entertainment control module and the touch screen display No GO to PINPOINT TEST I : INFORMATION AND ENTERTAINMENT CONTROL MODULE TESTS . |
PINPOINT TEST I: INFORMATION AND ENTERTAINMENT CONTROL MODULE TESTS
| Test Conditions | DETAILS/RESULTS/ACTIONS |
|---|
| I1: INFORMATION AND ENTERTAINMENT CONTROL MODULE TEST 1 |
| 1. Using the manufacturer approved diagnostic system, check the information and entertainment control module for related DTCs |
| Is communication possible between the manufacturer approved diagnostic system and the information and entertainment control module? Yes Refer to the relevant DTC index No GO to I2. |
| I2: INFORMATION AND ENTERTAINMENT CONTROL MODULE TEST 2 |
| 1. Refer to the electrical circuit diagrams and test the information and entertainment control module power and ground circuits for open circuit, high resistance |
| Are the power and ground circuits within specification? Yes GO to I3. No Repair the power and/or ground circuit |
| I3: INFORMATION AND ENTERTAINMENT CONTROL MODULE TEST 3 |
| 1. Using the manufacturer approved diagnostic system, perform a CAN network integrity test. Refer to the electrical circuit diagrams and test the medium speed CAN bus circuit for short circuit to ground, short circuit to power, open circuit, high resistance |
| Is the medium speed CAN bus within specification? Yes Install a new information and entertainment control module No Repair the medium speed CAN bus circuit |
PINPOINT TEST J: TOUCH SCREEN DISPLAY TESTS
| Test Conditions | DETAILS/RESULTS/ACTIONS |
|---|
| J1: TOUCH SCREEN DISPLAY TEST 1 |
| 1. Refer to the electrical circuit diagrams and test the touch screen display power and ground circuits for open circuit, high resistance |
| Are the power and ground circuits within specification? Yes GO to J2. No Repair the power and/or ground circuit |
| J2: TOUCH SCREEN DISPLAY TEST 2 |
| 1. Reconnect the MOST harness to the touch screen display |
| 2. 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 : MOST NETWORK INITIAL TESTS . No Install a new touch screen display |
DTC Index
For a complete list of all Diagnostic Trouble Codes (DTCs) that could be logged on this vehicle, please refer to Diagnostic Trouble Code (DTC) Index - DTC: Body Control Module (BCM) .
Scheme 6
Scheme 7
Scheme 8
- If renewing the CJB, use Land Rover approved diagnostic equipment to interrogate the module and upload the stored data, prior to removal of the CJB.
- Disconnect the battery ground cable. Refer to «Specifications»(ref-531959-S27829531522013022000000) .
- Remove the glove compartment. Refer to «Glove Compartment»(ref-531962-S10250369972013022000000) .
- See figure.
- See figure.
- See figure.
