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

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

G1 CHECK THE REAR WINDOW DEFROST GRID WITH THE RELAY REMOVED
- Key in OFF position.
- Disconnect: Rear Window Defrost Relay C1099.
- Key in ON position.
- Check the rear window defrost grid with the relay removed.
- Is the rear window defrost still ON?
Yes : GO to G5.

No : GO to G2.
G2 CHECK THE REAR WINDOW DEFROST RELAY
- Carry out the Rear Window Defrost Relay component test. Refer to COMPONENT TESTING -- ESCAPE & MARINER or COMPONENT TESTING -- ESCAPE HYBRID & MARINER HYBRID .
- Did the rear window defrost relay pass the component test?
Yes : GO to G3.

No : INSTALL a new rear window defrost relay. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
G3 CHECK CIRCUIT 1010 (DB/OG) FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: Rear Window Defrost Switch C241.
- Measure the resistance between rear window defrost switch C241-2, circuit 1010 (DB/OG), harness side and ground.
  
  Fig 1: Checking Circuit 1010 (DB/OG) For A Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
Yes : INSTALL a new rear window defrost switch. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.

No : GO to G4.
G4 CHECK THE SJB FOR AN INTERNAL SHORT
- Disconnect: SJB C2280e.
- Measure the resistance between rear window defrost switch C241-2, circuit 1010 (DB/OG), harness side and ground.
  
  Fig 2: Checking SJB For An Internal Short
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
Yes : GO to G7.

No : REPAIR the circuit. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
G5 CHECK CIRCUIT 186 (BN/LB) FOR A SHORT TO VOLTAGE
- Key in OFF position.
- Disconnect: Rear Window Defrost Grid C402a.
- Disconnect: SJB C2280c.
- Key in ON position.
- Measure the voltage between rear window defrost grid C402a-2, circuit 186 (BK), harness side and ground.
  
  Fig 3: Checking Circuit 186 (BN/LB) For A Short To Voltage
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
Yes : REPAIR the circuit. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.

No : GO to G6.
G6 CHECK CIRCUIT 59 (DG/VT) FOR A SHORT TO VOLTAGE
- Measure the voltage between SJB C2280c-21, circuit 59 (DG/VT), harness side and ground.
  
  Fig 4: Checking Circuit 59 (DG/VT) For A Short To Voltage
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
Yes : REPAIR the circuit. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.

No : GO to G7.
G7 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
  - corrosion.
  - pushed-out pins.
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.

No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.