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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1394 (Seat System - Seating) >> Diagnostic Tests >> Seats >> Pinpoint Tests >> Pinpoint Test Q: The Heated Seat is Inoperative - Driver Seat Does Heat But the Heated Seat Indicator Does Not Illuminate When Pressed >> Pinpoint Test Q: The Heated Seat Is Inoperative - Driver Seat Does Heat But The Heated Seat Indicator Does Not Illuminate When Pressed

Pinpoint Test Q: 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 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The air bag warning indicator illuminates when the correct restraints control module (RCM) fuse is removed and the ignition switch is ON.
NOTE: The supplemental restraint system (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
  1. Q1 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 article.
    • Disconnect the driver seat side air bag module C327.
    • Disconnect the passenger seat side air bag module C313.
    • Disconnect: HVAC Module C2356b (MKZ) or C228b (Fusion and Milan)
    • Disconnect: Heated Seat Module C3304
      • 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. Refer to BATTERY, MOUNTING AND CABLES article.
      • Fig 1: Measuring Resistance
      GF0016408Courtesy of FORD MOTOR CO.
    • For MKZ, measure the resistance between HVAC module C2356b-7, circuit CHS04 (YE/GY), harness side and ground; and between HVAC module C2356b-8, circuit CHS13 (VT/BN), harness side and ground.
      • Fig 2: Measuring Resistance
      GF0028292Courtesy of FORD MOTOR CO.
    • For Fusion and Milan, measure the resistance between HVAC module C228b-11, circuit CHS04 (YE/GY), harness side and ground; and between HVAC module C228b-9, circuit CHS13 (VT/BN), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  Q2.
    2. NO  : REPAIR the affected circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  2. Q2 CHECK CIRCUITS CHS04 (YE/GY) AND CHS13 (VT/BN) FOR AN OPEN 
    • Key in ON position.
      • Fig 3: Measuring Resistance
      GF0028293Courtesy of FORD MOTOR CO.
    • For MKZ, measure the resistance between HVAC module C2356b-7, circuit CHS04 (YE/GY), harness side and heated seat module C3304-5, circuit CHS04 (YE/GY), harness side; and between HVAC module C2356b-8, circuit CHS13 (VT/BN), harness side and heated seat module C3304-4, circuit CHS13 (VT/BN), harness side.
      • Fig 4: Measuring Resistance
      GF0028294Courtesy of FORD MOTOR CO.
    • For Fusion and Milan, measure the resistance between HVAC module C228b-11, circuit CHS04 (YE/GY), harness side and heated seat module C3304-5, circuit CHS04 (YE/GY), harness side; and between HVAC module C228b-9, circuit CHS13 (VT/BN), harness side and heated seat module C3304-4, circuit CHS13 (VT/BN), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  Q3.
    2. NO  : REPAIR the affected circuit. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  3. Q3 CHECK THE HEATED SEAT MODULE HI INDICATOR ON THE HVAC MODULE 
    • Connect: HVAC Module C2356b (MKZ) or C228b (Fusion and Milan)
    • Key in ON position.
      • Fig 5: Checking Heated Seat Module HI Indicator On EATC Module
      GF0028295Courtesy of FORD MOTOR CO.
    • Connect a fused jumper lead between heated seat module C3304-4, circuit CHS13 (VT/BN), harness side and C3304-1, circuit SBB11 (BU/RD), harness side.
    • Do both driver heated seat indicator LEDs illuminate on the HVAC module? 
    1. YES  : Go to  Q4.
    2. NO  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL article. TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

  4. Q4 CHECK THE HEATED SEAT MODULE LOW INDICATOR ON THE HVAC MODULE 
      Fig 6: Checking Heated Seat Module Low Indicator On EATC Module
      GF0028296Courtesy of FORD MOTOR CO.
    • Connect a fused jumper lead between heated seat module C3304-5, circuit CHS04 (YE/GY), harness side and C3304-1, circuit SBB11 (BU/RD), harness side.
    • Does only the left driver heated seat indicator LED illuminate on the HVAC module? 
    1. YES  : INSTALL a new heated seat module. REFER to Heated Seat Module . TEST the system for normal operation.

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

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

      DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C327. CONNECT passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

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