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Pinpoint Test N: The Defrost System Will Not Shut Off Automatically

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. N1 CHECK THE REM DTCS 
    • Retrieve the recorded results from the REM self-test.
    • Are any REM DTCs recorded? 
    1. Yes  : REFER to the REM DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
    2. No  : GO to N2.
  2. N2 CHECK FOR A STICKING HEATED REAR WINDOW RELAY 
    • Key in OFF position.
    • Disconnect: Heated Rear Window Relay C443.
    • Key in ON position.
    • Is the heated rear window off? 
    1. Yes  : GO to N3.
    2. No  : GO to  N5.
  3. N3 CHECK THE HEATED REAR WINDOW RELAY 
    • Key in OFF position.
    • Check the heated rear window relay.

      Refer to COMPONENT TESTING .

    • Did the heated rear window relay pass the component test? 
    1. Yes  : GO to N4.
    2. No  : INSTALL a new heated rear window relay. TEST the system for normal operation.
  4. N4 CHECK CIRCUIT 91S-HB23 (BN/WH) FOR A SHORT TO GROUND 
    • Disconnect: REM C420b.
    • Measure the resistance between the REM C420b-7, circuit 91S-HB23 (BN/WH), harness side and ground.
      Fig 1: Measuring Resistance Between REM C420B-7, Circuit 91S-HB23 (BN/WH), Harness Side And Ground
      G03203495Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes  : INSTALL a new REM. REFER to MODULE COMMUNICATIONS NETWORK - LS for the removal and installation procedure. TEST the system for normal operation.
    2. No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  5. N5 CHECK CIRCUITS 15S-DC1 (GN/YE), 29S-HB1 (OG/YE) FOR A SHORT TO POWER 
    • Key in OFF position.
    • Disconnect: BJB Fuse 9 (5A).
    • Key in ON position.
    • Measure the voltage between the BJB fuse 9 (5A) input cavity, circuit 15S-DC1 (GN/YE) and ground; and between the BJB fuse 9 (5A) output cavity, circuit 29S-HB1 (OG/YE) and ground.
      Fig 2: Measuring Voltage Between BJB Fuse 9 (5A) Input Cavity, Circuit 15S-DC1 (GN/YE) And Ground
      G03203496Courtesy of FORD MOTOR CO.
    • Does circuit 15S-DC1 (GN/YE) have greater than 10 volts? 
    1. Yes  : REPAIR the circuit. TEST the system for normal operation.
    2. No  : REPAIR circuit 29S-HB1 (OG/YE). TEST the system for normal operation.
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