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Home >> Ford >> 2005 >> Escape Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1091 (Exterior Lighting System) >> Diagnostic Tests >> Trailer Lamps >> Pinpoint Tests >> Pinpoint Test Z: The Trailer Lamps Are Inoperative - Trailer Parking Lamps >> Pinpoint Test Z: The Trailer Lamps Are Inoperative - Trailer Parking Lamps

Pinpoint Test Z: The Trailer Lamps Are Inoperative - Trailer Parking Lamps

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The battery ground cable must be disconnected for accurate test results when checking ground circuits for continuity to ground.
  1. Z1 CHECK CIRCUIT CAT11 (BN) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Trailer Tow C439
    • Place the headlamp switch in the PARKING LAMPS ON position.
    • Measure the voltage between the trailer tow C439-3, circuit CAT11 (BN), harness side and ground.
      • Fig 1: Checking Circuit For Voltage
      GF0011098Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
    2. NO  : Go to  Z2.
  2. Z2 CHECK THE TRAILER TOW PARKING LAMP RELAY 
    • Place the headlamp switch in the OFF position.
    • Disconnect: Trailer Tow Parking Lamp Relay
    • Carry out the trailer tow parking lamp relay component test. Refer to appropriate COMPONENT TESTING article.
    • Is the trailer tow parking lamp relay OK? 
    1. YES  : Go to  Z3.
    2. NO  : INSTALL a new trailer tow parking lamp relay. TEST the system for normal operation.
  3. Z3 CHECK CIRCUIT CLS30 (VT/WH) FOR AN OPEN 
    • Place the headlamp switch in the PARKING LAMPS ON position.
    • Measure the voltage between the trailer tow parking lamp relay pin 2, circuit CLS30 (VT/WH), harness side and ground.
      • Fig 2: Measuring Voltage
      GF0042716Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  Z4.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. Z4 CHECK THE SBB08 (VT/RD) FOR AN OPEN 
    • Place the headlamp switch in the OFF position.
    • Measure the voltage between the trailer tow parking lamp relay pin 3, circuit SBB08 (VT/RD), harness side and ground.
      • Fig 3: Measuring Voltage
      GF0042717Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  Z5.
    2. NO  : VERIFY the BJB fuse 8 (20A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  5. Z5 CHECK CIRCUIT GD120 (BK/GN) FOR AN OPEN 
    • Measure the resistance between the trailer tow parking lamp relay pin 1, circuit GD120 (BK/GN), harness side and ground.
      • Fig 4: Measuring Resistance
      GF0042718Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : REPAIR circuit CAT11 (BN) for an open. TEST the system for normal operation.
    2. NO  : REPAIR circuit GD120 (BK/GN) for an open. TEST the system for normal operation.
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