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Home >> Ford >> 2009 >> Explorer 4.6 8, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 161 (Instrument Cluster Illumination & Instrument Panel Illumination) >> Diagnostic Tests >> Instrument Cluster & Panel Illumination >> Pinpoint Tests >> Pinpoint Test C: The Climate Control Illumination Is Inoperative

Pinpoint Test C: The Climate Control Illumination Is Inoperative

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Cluster and Panel Illumination for schematic and connector information.

Normal Operation 

With the parking lamps on, the lighting control module (LCM) supplies a variable pulse width modulated (PWM) voltage to the heating ventilation air conditioning (HVAC) module (if equipped) or to the climate control assembly (manual temperature control) on circuit 484 (OG/BK). The HVAC module and the climate control assembly (manual temperature control) illumination is grounded through circuit 57 (BK). The driver door module (DDM) also generates a secondary variable voltage which is distributed to the HVAC module on circuit 19 (LB/RD).

This pinpoint test is intended to diagnose the following:

PINPOINT TEST C: THE CLIMATE CONTROL ILLUMINATION IS INOPERATIVE 

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. C1 CHECK CIRCUIT 484 (OG/BK) FOR AN OPEN 
    • Disconnect: HVAC Module C228b
    • Disconnect: Climate Control Assembly (Manual Temperature Control) C294d
    • With the parking lamps on, rotate the instrument panel dimmer switch to the maximum brightness position.
      • Fig 1: Checking Circuit For Open
      GF0014430Courtesy of FORD MOTOR CO.
    • Measure the voltage between the HVAC module C228b-14, circuit 484 (OG/BK), harness side and ground; or between the climate control assembly (manual temperature control) C294d-1, circuit 484 (OG/BK), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : If equipped with the automatic temperature control, go to  C2.

      If equipped with climate control assembly (manual temperature control), go to  C3.

    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  2. C2 CHECK CIRCUIT 19 (LB/RD) FOR VOLTAGE 
      Fig 2: Checking Circuit For Voltage
      GF0014431Courtesy of FORD MOTOR CO.
    • Measure the voltage between the HVAC module C228a-19, circuit 19 (LB/RD), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL article. TEST the system for normal operation.
    2. NO  : Go to  C4.
  3. C3 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
      Fig 3: Checking Circuit For Open
      GF0014432Courtesy of FORD MOTOR CO.
    • Measure the resistance between the climate control assembly (manual temperature control) C294d-2, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : VERIFY the climate control assembly (manual temperature control) bulb is OK. If OK, INSTALL a new climate control assembly (manual temperature control) module. REFER to CLIMATE CONTROL article. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. C4 CHECK CIRCUIT 19 (LB/RD) FOR AN OPEN OR SHORT TO GROUND 
    • Key in OFF position.
    • Place the headlamp switch in the OFF position.
    • Disconnect: Driver Door Module C501b
    • Disconnect: Overhead Console (With Moonroof) C9013b
      • Fig 4: Checking Circuit For Open Or Short To Ground
      GF0014433Courtesy of FORD MOTOR CO.
    • Measure the resistance between the HVAC module C228a-19, circuit 19 (LB/RD), harness side and the driver door module C501b-14, circuit 19 (LB/RD), harness side; and between the HVAC module C228a-19, circuit 19 (LB/RD), harness side and ground.
    • Is the resistance less than 5 ohms between the HVAC module and the driver door module, and greater than 10,000 between the HVAC module and ground? 
    1. YES  : Go to  C5.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. C5 CHECK FOR CORRECT DDM OPERATION 
    • Key in OFF position.
    • Disconnect all the DDM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the DDM 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 DDM. REFER to MULTIFUNCTION ELECTRONIC MODULES article. 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.
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