Air Bag System - SRS Overlay Harness Availability: Overview
No.: LA501-020Issue: 1
Date: June 12, 2006
SECTION: 501-20B
Supplemental Restraint System Overlay Harnesses
AFFECTED VEHICLE RANGE:
Land Rover LR3 (LA) VIN: 5A000360 onwards
CONDITION SUMMARY:
OVERLAY HARNESS REPAIRS TO SUPPLEMENTAL RESTRAINT SYSTEM (SRS) WIRING
NOTE:
Service repair harnesses are now available to repair sections of the fascia/body SRS wiring harness without replacement of the complete harness.
The Worldwide Diagnostic System (WDS) may display Diagnostic Trouble Codes (DTC) from the Restraints Control Module (RCM) indicating an SRS wiring fault for one or more of the following reasons:
^ SRS wiring harness open circuit
^ SRS wiring harness short circuit
^ Air bag deployment during a vehicle collision which causes heat damage to an air bag connector.
Cause:
SRS wiring harness damage or open circuit/short circuit condition.
Action:
In the event a DTC from the RCM indicates an SRS wiring fault, refer to the Workshop Manual Service Procedure detailed in this bulletin to identify and replace the problem harness section with the appropriate overlay repair harness.
CAUTION:
The firing circuit wiring between the air bags and RCM must not be repaired under any circumstances and must be replaced using the overlay harnesses described below.
If an air bag has been deployed, the wiring harness that connects directly to the air bag MUST be replaced at the same time as the deployed air bag.
If a seat belt pretensioner has been deployed, replace this component only.
In case of the driver's air bag deployment, the "clock-spring" spiral connector MUST be replaced at the same time as the deployed air bag, but it is not necessary to replace the harness from the clock-spring to the fascia/body harness connector.
CAUTION:
Where an air bag has deployed, the SRS overlay harness sections associated to the deployed air bag MUST be installed.
PARTS
TOOLS
WARRANTY
SERVICE INFORMATION
NOTE:
^ Any harness replacement following accident related damage IS NOT claimable under warranty.
^ Refer to the relevant electrical circuit diagrams and electrical library to determine the harness section to be ordered to complete the repair.
^ Installation of driver and passenger overlays will require removal of the fascia. For further information refer to the relevant section in Global Technical Reference (GTR).
^ Replacement of all other overlays may require removal of some interior trim for access. For further information refer to the relevant section in Global Technical Reference (GTR).
^ The routing of the overlay harness MUST follow the routing of the original harness exactly while being secured by proper electrical tape or cable ties at regular intervals.
^ Always start securing the overlay harness from the point closest to the air bag and route towards the Restraints Control Module (RCM). In some cases the wiring will be longer than required as the overlay harnesses are designed to be used on left-hand and right-hand drive vehicles. Any surplus MUST be coiled and secured to the harness in the vicinity of the RCM or the body-to-fascia harness connector.
^ All DTCs should be cleared after repair using WDS.
NOTE:
GTR Workshop Manual does not yet contain overlay harness installation instructions.
1. Refer to the Workshop Manual extracts shown in this bulletin for guidance with specific overlay harness installation until GTR is updated.
2. When harness repairs are completed initiate a diagnostic session and clear all DTC's using WDS.
Disclaimer