Technical Service Bulletins

Headrest deployed without crash

Order Reprints
Headrest deployed without crash

Some 2010-2011 model year Lexus GS 350/450h/460 vehicles may exhibit a condition where the active headrest activates without a collision event, causing a poor appearance. This condition may be present on both front seats. A revised Active Headrest Lower Unit has been developed to address this condition.

This TSB applies to vehicles produced before the production change effective VINs shown here:

MODEL        DRIVETRAIN                    PRODUCTION CHANGE EFFECTIVE VIN

GS 350……….2WD……………………….JTHBE1KS#B0053790

GS 350……….AWD………………………JTHCE1KS#B0030410

GS 450h………2WD………………………JTHBC1KS#B5024523

GS 460……….2WD……………………….JTHBL1KS#B5004424

PARTS INFORMATION

PREV. P/N          CURRENT P/N                         PART                                             QTY

71644-30020……..71644-30021……….Unit, active headrest, lower……….......…….....1

72380-30020…………same ………..…Cable assembly, seat adjuster control No. 2…..1

71910-30D##-##……..same ………..…Headrest assembly, front seat…………….....…1

NOTE: If the active headrest is deployed, the front seat headrest assembly, No. 2 seat adjuster control cable assembly and the active headrest lower unit must be replaced.

NOTE: The Plastic Pry Tool Set SST p/n 00002-06000-01 is required. This SST is available by calling (800) 933-8335.

REPAIR PROCEDURE

  1. Visually confirm the condition by examining the front seat headrests. If a headrest is extended or deployed (not caused by a collision), this TSB may apply. If not, follow the repair manual and/or collision repair manual for additional diagnostics.
  2. Remove the front seat headrest assembly, No. 2 seat adjuster control cable assembly and active headrest lower unit. Refer to the repair manual.
  3. Replace the front seat headrest assembly, No. 2 seat adjuster control cable assembly and NEW active headrest lower unit.

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