Land Rover Defender: Airbag Supplementary Restraint System

DIAGNOSIS AND TESTING

PRINCIPLE OF OPERATION

For a detailed description of the supplemental restraints system and operation, refer to the relevant Description and Operation section in the workshop manual. REFER to: Airbag and Safety Belt Pretensioner Supplemental Restraint System - [+] Vehicles with 2nd / 3rd Row Seats (Supplementary Restraint System, Description and Operation).

SAFETY INFORMATION

WARNINGS:

• TO AVOID ACCIDENTAL DEPLOYMENT AND POSSIBLE PERSONAL INJURY, THE BACKUP POWER SUPPLY MUST BE DEPLETED BEFORE REPAIRING OR REPLACING ANY AIRBAG SUPPLEMENTAL RESTRAINT SYSTEM (SRS) COMPONENTS. TO DEPLETE THE BACKUP POWER SUPPLY ENERGY, DISCONNECT THE BATTERY GROUND CABLE AND WAIT ONE MINUTE. FAILURE TO FOLLOW THIS INSTRUCTION MAY RESULT IN PERSONAL INJURY
• Do not use a multimeter to probe the restraints control module. It is possible for the power from the meter battery to trigger the activation of the airbags. Failure to follow this instruction may result in personal injury

NOTE: It is advisable not to use a mobile phone or to have a mobile phone in close proximity when working on the restraints control module or associated systems

Power Supply Depletion

Before beginning any work on the restraints control module/supplemental restraints system or related components:

1. Remove the ignition key
2. Disconnect the battery leads, ground first
3. Wait 1minute for the power circuit to discharge

There are comprehensive instructions on the correct procedures for supplemental restraints system repairs in the manual. Refer to the relevant section of the workshop manual

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

NOTES:

• If the control module or a component may be at fault 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/component
• Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests

1. Verify the customer concern
   1. Confirm the function of the warning lamp (if the warning lamp is inoperative, system faults will be signaled by an audible chime)
2. Visually inspect for obvious signs of damage and system integrity

Visual Inspection

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step. Faults in supplemental restraint system harnesses would normally mean replacement of the relevant harness. Supplemental restraint system harness repairs are not recommended

Symptom Chart

4. If the cause is not visually evident, verify the symptom and refer to the Symptom Chart, alternatively check for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index
5. Check JLR claims submission system for open campaigns. Refer to the corresponding bulletins and SSMs which may be valid for the specific customer complaint and complete the recommendations as required
6. When installing or checking the supplemental Restraints System (SRS) with AK2 connectors the locking plunger must be engaged

RESTRAINTS CONTROL MODULE FLEXRAY COMMUNICATION TABLE

For DTCs U0001-81, U0001-86 and U0001-87: Using the Jaguar Land Rover approved diagnostic equipment, check the snapshot data (0xD020) to determine the missing message source control module. Check the relevant control module for related DTCs and refer to the relevant DTC index. Using the Jaguar Land Rover approved diagnostic equipment, perform a FlexRay network integrity test. Refer to the electrical circuit diagrams and check the Vehicle communication bus F (FlexRay) between the relevant control module (i.e. as indicated by the snapshot data) and the restraints control module

To decode the Hexadecimal response use the following table

OCCUPANT CLASSIFICATION SENSOR CONTROL MODULE (OCSCM)

NOTE: Occupant classification sensor system for the front passenger seat - North American Specification (NAS) vehicles only

The Occupant Classification Sensor Control Module (OCSCM) serves as a slave module to the Restraints Control Module (RCM). OCSCM DTCs are stored in the RCM. Diagnostic routines are run through the RCM. If OCSCM replacement is necessary, install a new occupant classification sensor service kit (Complete service kit consists of foam, occupant classification sensor bladder mat with attached smart digital pressure sensor as a minimum. Do not attempt to install individual components from the service kit as they are calibrated to function as a single assembly) The OCSCM incorporates 3 load statuses for the seat cushion:

• When the load is less than the lower limit, the seat is classified as unoccupied.
• When the load exceeds the lower limit, but is less than the upper limit, the seat is classified as occupied by a small person or a child restraint is being used.
• When the upper limit is exceeded, the seat is classified as occupied by an adult.

The occupant classification system has four possible states as detailed in the following table:

OCCUPANT CLASSIFICATION SENSOR CONTROL MODULE (OCSCM) EXISTING MODULE PROGRAMMING

NOTE: Do not attempt to install individual components from the Occupant Classification Sensor (OCS) service kit, as they are calibrated to function as a single assembly. The complete service kit consists of foam, occupant classification sensor bladder mat with attached smart digital pressure sensor as a minimum. The CAN type communication and LIN type communication OCS types are NOT interchangeable. Make sure the correct service kit for the vehicle is being used.

1. Check the seat and make sure all electrical connectors are secure. Make sure the seat is correctly mounted and fixings are tightened to the correct torque.

NOTE: Make sure the vehicle is stationary and on a level surface. The seat must be secure and in an upright position before performing the next step. Failure to do this could induce a DTC.

2. Connect the Jaguar Land Rover approved diagnostic equipment
3. Set the ignition to ON and wait 10 seconds. Make sure the SRS warning light is illuminated during the ignition test cycle. The SRS warning light should then extinguish after the 10 seconds to confirm no SRS faults exist

NOTE: All OCS DTCs will be set in the RCM.

4. Wait 5 seconds then set the OCS control module in to security access mode, after going in to an extended diagnostic session
5. Using the Jaguar Land Rover approved diagnostic equipment, refer to datalogger signals ECU calibration Data #1 Number (0xF124), ECU Delivery Assembly Number (0xF113), ECU Core Assembly Number (0xF111), ECU Strategy Number (0xF188). Make a note of the OCS control module part number to make sure it is the correct part number for the vehicle
6. Using the Jaguar Land Rover approved diagnostic equipment, check and update the OCS control module to the latest level software. Make sure the ignition is set to OFF and wait at least 5 seconds
7. Set the ignition to ON and wait at least 125 seconds. This will allow sufficient time for DTCs to log in the RCM if any are present
8. Using the Jaguar Land Rover approved diagnostic equipment, check for OCS and Restraints Control Module (RCM) DTCs stored in the RCM. If no DTCs are found and no SRS warning light is illuminated, no further action is necessary. If any DTCs are found and/or the SRS warning light is illuminated, refer to the relevant section of the workshop manual and perform the relevant repair actions as necessary. Re-perform this procedure to confirm the repair

OCCUPANT CLASSIFICATION SENSOR CONTROL MODULE (OCSCM) NEW MODULE REPLACEMENT AND PROGRAMMING

NOTE: Do not attempt to install individual components from the Occupant Classification Sensor (OCS) service kit, as they are calibrated to function as a single assembly. The complete service kit consists of foam, occupant classification sensor bladder mat with attached smart digital pressure sensor as a minimum. They MUST NOT be installed separately. To make sure the correct function, it is essential to install the complete kit, as it is a safety critical system.

1. Remove the passenger seat from the vehicle.
2. Install a new OCS service kit to the seat.
3. Re-install the seat and make sure all electrical connectors are secure.

NOTE: Make sure the vehicle is stationary and on a level surface. The seat must be secure and in an upright position before performing the next step. Failure to do this could induce a DTC.

4. Connect the Jaguar Land Rover approved diagnostic equipment, set the ignition to ON and wait 5 seconds for the module to wake up
5. Using the Jaguar Land Rover approved diagnostic equipment, refer to datalogger signals ECU calibration Data #1 Number (0xF124), ECU Delivery Assembly Number (0xF113), ECU Core Assembly Number (0xF111), ECU Strategy Number (0xF188). Make a note of the OCS control module part number to make sure it is the correct part number for the vehicle
6. Using the Jaguar Land Rover approved diagnostic equipment, check and update the OCS control module to the latest level software. Make sure the ignition is set to OFF and wait at least 7 seconds
7. Set the OCS control module in to security access mode, after going in to an extended diagnostic session.

   Using the Jaguar Land Rover approved diagnostic equipment, check for any OCS control module or Restraints Control Module (RCM) related DTCs. If any DTCs are found, perform a software update

NOTE: All OCS DTCs will be set in the RCM.

8. Set the ignition to OFF and wait 10 seconds
9. Set ignition to ON and wait 10 seconds
10. Set the OCS control module in to security access mode, after going in to an extended diagnostic session
11. Using the Jaguar Land Rover approved diagnostic equipment, perform routine - Learn Seat Occupant Classification Zero Position (0x5007) This will re-calibrate the new OCS control module
12. Set the ignition to OFF and wait at least 10 seconds
13. Set the ignition to ON and wait 10 seconds. Make sure the SRS warning light is illuminated during the ignition test cycle. The SRS warning light should then extinguish after the 10 seconds to confirm no SRS faults exist
14. If the Learn Seat Occupant Classification Zero Position (0x5007) routine passes (09) and no SRS warning light is illuminated, no further action is necessary. If the Learn Seat Occupant Classification Zero Position (0x5007) routine fails and/or the SRS warning light is illuminated, note which process of the routine failed from the routine parameters described below and proceed to step 15
    1. 02 - Process Failed - Seat Not Calibrated. The Learn Zero position cannot be calibrated if the seat has not been correctly calibrated at the seat manufacturing plant. Install a new service kit as necessary and re perform Learn Seat Occupant Classification Zero Position routine (0x5007)
    2. 03 - Process Failed - Wait 10 Seconds To Re Zero. Wait 10 seconds after ignition ON and re perform Learn Seat Occupant Classification Zero Position routine (0x5007)
    3. 04 - Re Zero Failure - DTCs Set. A fault is preventing the Learn Seat Occupant Classification Zero Position routine (0x5007) from completing correctly. Check for DTCs and repair as necessary, then re perform Learn Seat Occupant Classification Zero Position routine (0x5007)
    4. 06 - Process Failed - OCS Pressure Out Of Range. The seat must be empty to perform the Learn Seat Occupant Classification Zero Position routine (0x5007) correctly. Make sure the seat is empty and re perform Learn Seat Occupant Classification Zero Position routine (0x5007)
    5. 07 - Process Failed - OCS Pressure Fluctuation. Check to make sure the OCS hose is correctly routed and clipped in position, as this could prevent the Learn Seat Occupant Classification Zero Position routine (0x5007) from completing correctly. Any vibrations or variations within the passenger compartment, for example doors opening / closing will prevent the Learn Seat Occupant Classification Zero Position routine (0x5007) from completing correctly. Make sure the passenger compartment environment is stable and re perform Learn Seat Occupant Classification Zero Position routine (0x5007)
    6. 08 - Process Failed - Temperature Out Of Range. Make sure the workshop temperature is within normal acceptable working range and re perform Learn Seat Occupant Classification Zero Position routine (0x5007)
    7. 09 - Process Completed - Re Zero Success. Routine has passed, no further actions necessary
15. Using the Jaguar Land Rover approved diagnostic equipment, check for any OCS control module or RCM related DTCs. If any DTCs are found, refer to the relevant section of the workshop manual and perform the relevant repair actions as necessary. Re-perform this procedure to re-calibrate the OCS control module

SEAT POSITION SENSOR - NOTES ON REMOVAL/REPLACEMENT

NOTE: NAS vehicles have a seat position sensor installed to both the driver and passenger-side seats.

The seat position sensor, a hall-effect sensor, is installed to the underside of both the driver and passenger-side seats on NAS vehicles. It should be noted that these sensors cannot be re-installed when removed. If any work is undertaken that requires removal of the seat position sensor, a NEW sensor MUST be installed. Note that different sensors are installed to left and right seats, so care should be taken to make sure the correct replacement parts are installed

SUPPLEMENTAL RESTRAINTS SYSTEM (SRS) AK2 TYPE CONNECTORS

• Incorrect Position (Disengaged)

• Correct Position (Engaged)

Seatbelt Buckle Pre Tensioner Diagnostics

This procedure should be used to aid diagnosis of the following supplementary restraints system (SRS) - buckle pre tensioner (PBP) fault codes

PINPOINT TEST A : BUCKLE/RETRACTOR PRE TENSIONER DIAGNOSTIC

PINPOINT TEST B : BUCKLE/RETRACTOR PRE TENSIONER DIAGNOSTIC

PINPOINT TEST C : BUCKLE/RETRACTOR PRETENSIONER DIAGNOSTIC

PINPOINT TEST C : BUCKLE/RETRACTOR PRETENSIONER DIAGNOSTIC

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