Question about Lincoln Navigator

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2006 Lincoln Navigator. My driver side heated seat is flaking out. I turn it on after starting the vehicle and it comes on for about 20 seconds and then shuts off. If i push the button a second time it flashes and turns off. If i push it a third time nothing happens. It is the same with the A/C seat control. The passenger side seems to operate properly. How do I repair this issue. WInter is coming to Edmonton soon..... Thanks, Colin

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Electronics involved !
The climate control seat system is able to heat and cool the front seats. Each climate controlled seat is operated by push-buttons on the dual automatic temperature controller (EATC) located on the instrument panel. Each front seat temperature is then monitored and controlled by the dual climate control seat module (dual CCSM) located underneath the passenger front seat cushion.

Both the driver and front passenger climate controlled seats are independently controlled electronically by the dual climate controlled seat module (CCSM) mounted to the bottom of the passenger seat cushion. The climate controlled seat system only operates with the engine running, however, if using a diagnostic tool to command the dual CCSM, diagnostic testing can be carried out with the ignition switch key ON engine OFF (KOEO). The system receives power from central junction box (CJB) fuse 118 (30A) through circuit 1153 (RD/BK) feeding battery voltage into dual CCSM C3265b pins 1 and 24. If power is disconnected from either pin 1 or 24 of dual CCSM C3265b, only 1 seat will be disabled (pin 1 for driver seat, pin 24 for passenger seat), the other will remain operational. Since both climate controlled seats operate independently, if a fault occurs setting a DTC specific to either climate controlled seat, only the affected seat will be disabled by the module and the other will remain operational.

Sorry , but it would be best for you to take it to the dealer or someother qualified repair shop.

Posted on Jun 29, 2017

  • Jeff Armer Jun 29, 2017

    DTC Description Retrieved Action
    B1111 Driver Thermal Electric Device Control Over-temperature Fault Continuous If DTC B2729, B272A, B272B or B2930 is also present, Go To Pinpoint Test S and diagnose that concern first. Otherwise, Go To Pinpoint Test T .
    B1112 Driver Thermal Electric Device Control Shorted Fault Continuous If DTC B2729, B272A, B272B or B2930 is also present, Go To Pinpoint Test S and diagnose that concern first. Otherwise, Go To Pinpoint Test T .

  • Jeff Armer Jun 29, 2017

    Pinpoint Test S: DTC B2729/B272A — Cushion Over-Temp Detected (Driver/Passenger); DTC B2730/B272B — Back Over-Temp Detected (Driver/Passenger); DTC B272C/B272D — Differential Temperature Fault (Driver/Passenger)

    Normal Operation
    Each thermo-electric device (TED) contains an internal temperature sensor (thermistor) that is used by the dual climate controlled seat module (dual CCSM) to monitor the temperature of each TED. Based on the temperature of a TED, the internal sensor resistance will vary the voltage on circuit 1548 (DG/LG) (seat cushion TED) and circuit 1549 (DB/OG) (backrest TED).

    Possible Causes
    An over-temp or differential temperature fault can be caused by:

    wiring, terminals or connectors.
    damaged, restricted or disconnected air ducts.
    worn, damaged or incorrectly installed foam wedge, cushion foam or seat cushion trim cover.
    airflow leaks.
    collapsed airflow channels in the seat cushion foam.
    incorrect installation of a TED.
    dual CCSM.

    NOTE: The presence of over-temperature faults (DTCs B2729, B272A, B272B and B2730) can be induced by incorrect operation of the climate controlled seat system after an initial HEAT setting has been attained. If a HEAT setting is repeatedly turned OFF and ON in an attempt to increase the seat temperature, an over-temperature condition can result and the DTC(s) will be set.



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