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WARNING LAMPS ILLUMINATED Investigation of ABS, Traction Control (TC) or Hill Descent Control (HDC) warning lamp illumination using T4 may reveal fault code “11,4: Shuttle Valve Switch (SVS) electrical failure.” Because the cause of an SVS electrical failure does not necessarily lie within the Modulator, additional diagnostic routines may be required to define the problem further and ensure that the correct action is taken. RESOLUTION: PERFORM SPECIFIED TROUBLESHOOTING STEPS NOTE: A number of ABS modulators have been returned to Land Rover with “no fault found” when subjected to testing. This bulletin must be used as a guide to correctly diagnose a concern before replacing an ABS modulator. Should a customer complain about the illumination of the warning lamps and T4 investigate reveals fault code “11,4 SVS electrical fault,” use the information in this bulletin to correctly diagnose the customer’s concern.
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