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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 R: The Heated Seat is Inoperative - Passenger Seat Does Heat But the Heated Seat Indicator Does Not Illuminate When Pressed >> Pinpoint Test R: The Heated Seat Is Inoperative - Passenger Seat Does Heat But The Heated Seat Indicator Does Not Illuminate When Pressed

Pinpoint Test R: The Heated Seat Is Inoperative - Passenger 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. R1 CHECK CIRCUITS CHS09 (GY) AND CHS14 (GN) 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 passenger seat side air bag 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
      GF0016412Courtesy of FORD MOTOR CO.
    • For MKZ, measure the resistance between HVAC module C2356b-20, circuit CHS09 (GY), harness side and ground; and between HVAC module C2356b-21, circuit CHS14 (GN), harness side and ground.
      • Fig 2: Measuring Resistance
      GF0028297Courtesy of FORD MOTOR CO.
    • For Fusion and Milan, measure the resistance between HVAC module C228b-5, circuit CHS09 (GY), harness side and ground; and between HVAC module C228b-16, circuit CHS14 (GN), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  R2.
    2. NO  : REPAIR the affected circuit. TEST the system for normal operation.

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

  2. R2 CHECK CIRCUITS CHS09 (GY) AND CHS14 (GN) FOR AN OPEN 
    • Key in ON position.
      • Fig 3: Checking Circuits CHS09 (GY) And CHS14 (GN) For Open (1 Of 2)
      GF0028298Courtesy of FORD MOTOR CO.
    • Measure the resistance between HVAC module C2356b-20, circuit CHS09 (GY), harness side and heated seat module C3304-3, circuit CHS09 (GY), harness side; and between HVAC module C2356b-21, circuit CHS14 (GN), harness side and heated seat module C3304-6, circuit CHS14 (GN), harness side.
      • Fig 4: Checking Circuits CHS09 (GY) And CHS14 (GN) For Open (2 Of 2)
      GF0028299Courtesy of FORD MOTOR CO.
    • Measure the resistance between HVAC module C228b-5, circuit CHS09 (GY), harness side and heated seat module C3304-3, circuit CHS09 (GY), harness side; and between HVAC module C228b-16, circuit CHS14 (GN), harness side and heated seat module C3304-6, circuit CHS14 (GN), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  R3.
    2. NO  : REPAIR the affected circuit. TEST the system for normal operation.

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

  3. R3 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
      GF0028300Courtesy of FORD MOTOR CO.
    • Connect a fused jumper lead between heated seat module C3304-6, circuit CHS14 (GN), harness side and C3304-1, circuit SBB11 (BU/RD), harness side.
    • Do both passenger heated seat indicator LEDs illuminate on the HVAC module? 
    1. YES  : Go to  R4.
    2. NO  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL article. TEST the system for normal operation.

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

  4. R4 CHECK THE HEATED SEAT MODULE LOW INDICATOR ON THE HVAC MODULE 
      Fig 6: Checking Heated Seat Module Low Indicator On EATC Module
      GF0028301Courtesy of FORD MOTOR CO.
    • Connect a fused jumper lead between passenger heated seat module C3304-3, circuit CHS09 (GY), harness side and C3304-1, circuit SBB11 (BU/RD), harness side.
    • Does only the left passenger 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 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 passenger seat side air bag module C313. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.

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