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Pinpoint Test F: The Anti-Theft Indicator Is Always/Never On

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Passive Anti-Theft System for schematic and connector information.

Normal Operation 

The passive anti-theft system (PATS) uses a visual anti-theft indicator located in the light sensor. This indicator proves out for 3 seconds when the key is turned to the ON or START position under normal operation. If there is a PATS concern, this indicator either flashes rapidly or glows steadily (for more than 3 seconds) when the key is turned to the ON or the START position. PATS also flashes the anti-theft indicator every 2 seconds at key off to act as a visual theft deterrent. The anti-theft indicator is controlled by the PCM.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST F: THE ANTI-THEFT INDICATOR IS ALWAYS/NEVER ON 

  1. F1 CHECK THE ANTI-THEFT INDICATOR FOR CORRECT OPERATION 
    • Key in OFF position.
    • Disconnect: PCM C175t
      • Fig 1: Checking Circuit For Voltage
      GF0047696Courtesy of FORD MOTOR CO.
    • Connect, then disconnect a fused jumper wire between the PCM C175t-32, circuit 1269 (OG/RD), harness side and ground.
    • Does the anti-theft indicator illuminate, then turn off? 
    1. YES  : Go to  F5.
    2. NO  : Go to  F2.
  2. F2 CHECK THE VOLTAGE TO THE ANTI-THEFT INDICATOR 
    • Disconnect: Light Sensor C287
      • Fig 2: Checking Circuit For Voltage
      GF0014690Courtesy of FORD MOTOR CO.
    • Measure the voltage between the light sensor C287-3, circuit 1524 (DB), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  F3.
    2. NO  : VERIFY the central junction box (CJB) fuse 19 (7.5A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  3. F3 CHECK CIRCUIT 1269 (OG/RD) FOR A SHORT TO GROUND 
      Fig 3: Checking Circuit For Short To Ground
      GF0004732Courtesy of FORD MOTOR CO.
    • Measure the resistance between the light sensor C287-4, circuit 1269 (OG/RD), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  F4.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. F4 CHECK CIRCUIT 1269 (OG/RD) FOR AN OPEN 
      Fig 4: Measuring Resistance
      GF0047697Courtesy of FORD MOTOR CO.
    • Measure the resistance between the light sensor C287-4, circuit 1269 (OG/RD), harness side, and the PCM C175t-32, circuit 1269 (OG/RD), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new light sensor. REFER to EXTERIOR LIGHTING article. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
  5. F5 CHECK FOR CORRECT PCM OPERATION 
    NOTE: When a new PCM is installed, the PATS keys must be programmed into the PCM.
    • Disconnect the PCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the PCM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS article. PROGRAM the PATS keys into the PCM. REFER to Key Programming Using Diagnostic Equipment . TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.
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