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Home >> Lincoln >> 2009 >> MKX FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1111 (Seat System) >> Diagnostic Tests >> Seats >> Pinpoint Tests >> Pinpoint Test W: The Heated Seat is Inoperative - Driver Seat Does Heat But the Heated Seat Indicator Does Not Illuminate When Pressed >> Pinpoint Test W: The Heated Seat Is Inoperative - Driver Seat Does Heat But The Heated Seat Indicator Does Not Illuminate When Pressed

Pinpoint Test W: The Heated Seat Is Inoperative - Driver Seat Does Heat But The Heated Seat Indicator Does Not Illuminate When Pressed

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The air bag warning indicator illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  1. W1 CHECK CIRCUITS CHS04 (YE/GY) AND CHS13 (VT/BN) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of SUPPLEMENTAL RESTRAINT SYSTEM .
    • Disconnect: Passenger seat side air bag C327
    • Disconnect: Passenger seat safety belt buckle pretensioner C3202
    • Disconnect: EATC Module C228b
    • Disconnect: Heated Seat Module C329
      • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.
    • Connect the battery ground cable.
      • Fig 1: Measuring Resistance Between EATC Module C228b-7 & C228b-8, Circuit CHS04 (YE/GY) & CHS13 (VT/BN)
      GF0016408Courtesy of FORD MOTOR CO.
    • Measure the resistance between EATC module C228b-7, circuit CHS04 (YE/GY), harness side and ground; and between EATC module C228b-8, circuit CHS13 (VT/BN), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  W2.
    2. NO  : REPAIR the affected circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  2. W2 CHECK CIRCUITS CHS04 (YE/GY) AND CHS13 (VT/BN) FOR AN OPEN 
      Fig 2: Measuring Resistance Between EATC Module C228b-7 & C228b-8, Circuit CHS04 (YE/GY) & CHS13 (VT/BN)
      GF0028293Courtesy of FORD MOTOR CO.
    • Measure the resistance between EATC module C228b-7, circuit CHS04 (YE/GY), harness side and heated seat module C329-5, circuit CHS04 (YE/GY), harness side; and between EATC module C228b-8, circuit CHS13 (VT/BN), harness side and heated seat module C329-4, circuit CHS13 (VT/BN), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  W3.
    2. NO  : REPAIR the affected circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  3. W3 CHECK THE HEATED SEAT MODULE HI INDICATOR ON THE EATC MODULE 
    • Connect: EATC Module C228b
    • Key in ON position.
      • Fig 3: Connecting Fused Jumper Lead Between Heated Seat Module C329-4 & C329-1, Circuit CHS13 (VT/BN) & SBB16 (VT/RD)
      GF0028295Courtesy of FORD MOTOR CO.
    • Connect a fused jumper lead between heated seat module C329-4, circuit CHS13 (VT/BN), harness side and C329-1, circuit SBB16 (VT/RD), harness side.
    • Do both driver heated seat indicator LEDs illuminate on the EATC module? 
    1. YES  : Go to  W4.
    2. NO  : INSTALL a new EATC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  4. W4 CHECK THE HEATED SEAT MODULE LOW INDICATOR ON THE EATC MODULE 
      Fig 4: Connecting Fused Jumper Lead Between Heated Seat Module C329-5 & C329-1, Circuit CHS04 (YE/GY) & SBB16 (VT/RD)
      GF0028296Courtesy of FORD MOTOR CO.
    • Connect a fused jumper lead between heated seat module C329-5, circuit CHS04 (YE/GY), harness side and C329-1, circuit SBB16 (VT/RD), harness side.
    • Does only the left driver heated seat indicator LED illuminate on the EATC module? 
    1. YES  : INSTALL a new heated seat module. REFER to Heated Seat Module - Front . TEST the system for normal operation.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    2. NO  : INSTALL a new EATC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.

      DISCONNECT the battery ground cable.

      CONNECT passenger safety belt buckle pretensioner C3202. CONNECT passenger seat side air bag module C327.

      REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

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