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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 AB: The Heated Seat is Inoperative - Left Rear Seat Does Heat But the Heated Seat Indicator Does Not Illuminate When Pressed >> Pinpoint Test Ab: The Heated Seat Is Inoperative - Left Rear Seat Does Heat But The Heated Seat Indicator Does Not Illuminate When Pressed

Pinpoint Test Ab: The Heated Seat Is Inoperative - Left Rear 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.
  1. AB1 CHECK CIRCUITS CHS49 (VT) AND CHS48 (YE) FOR A SHORT TO GROUND 
    • Disconnect: Left Rear Heated Seat Switch C722
    • Disconnect: Heated Seat Module C3162
      • Fig 1: Measuring Resistance Between Heated Seat Module C3162-5 & C3162-4, Circuit CHS49 (VT) & CHS48 (YE)
      GF0030824Courtesy of FORD MOTOR CO.
    • Measure the resistance between heated seat module C3162-5, circuit CHS49 (VT), harness side and ground; and between heated seat module C3162-4, circuit CHS48 (YE), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  AB2.
    2. NO  : REPAIR the affected circuit. TEST the system for normal operation.
  2. AB2 CHECK CIRCUITS CHS49 (VT) AND CHS48 (YE) FOR AN OPEN 
      Fig 2: Measuring Resistance Between Left Rear Heated Seat Switch C722-3 & C722-4, Circuit CHS49 (VT) & CHS48 (YE)
      GF0030825Courtesy of FORD MOTOR CO.
    • Measure the resistance between left rear heated seat switch C722-3, circuit CHS49 (VT), harness side and heated seat module C3162-5, circuit CHS49 (VT), harness side; and between left rear heated seat switch C722-4, circuit CHS48 (YE), harness side and heated seat module C3162-4, circuit CHS48 (YE), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  AB3.
    2. NO  : REPAIR the affected circuit. TEST the system for normal operation.
  3. AB3 CHECK THE HEATED SEAT HI INDICATOR 
    • Connect: Left Rear Heated Seat Switch C722
    • Key in ON position.
      • Fig 3: Connecting Fused Jumper Lead Between Heated Seat Module C3162-4 & C3162-1, Circuit CHS48 (YE) & SBB07 (WH/RD)
      GF0028295Courtesy of FORD MOTOR CO.
    • Connect a fused jumper lead between heated seat module C3162-4, circuit CHS48 (YE), harness side and C3162-1, circuit SBB07 (WH/RD), harness side.
    • Does the hi indicator LED illuminate on the left rear heated seat switch? 
    1. YES  : Go to  AB4.
    2. NO  : INSTALL a new rear heated seat switch. REFER to Heated Seat Switch - Rear Seat . TEST the system for normal operation.
  4. AB4 CHECK THE HEATED SEAT LOW INDICATOR 
      Fig 4: Connecting Fused Jumper Lead Between Heated Seat Module C3162-5 & C3162-1, Circuit CHS49 (VT) & SBB07 (WH/RD)
      GF0028296Courtesy of FORD MOTOR CO.
    • Connect a fused jumper lead between heated seat module C3162-5, circuit CHS49 (VT), harness side and C3162-1, circuit SBB07 (WH/RD), harness side.
    • Does the low indicator LED illuminate on the left rear heated seat switch? 
    1. YES  : INSTALL a new heated seat module. REFER to Heated Seat Module - Rear Seat . TEST the system for normal operation.
    2. NO  : INSTALL a new rear heated seat switch. REFER to Heated Seat Switch - Rear Seat . TEST the system for normal operation.
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