Pinpoint Test Q: The Door Ajar Warning Indicator Is Inoperative

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

Q1 CHECK THE INTERIOR LAMPS FOR CORRECT OPERATION
- Open and close each door while monitoring the interior lamps.
- Do the interior lamps operate correctly?
1. Yes : GO to Q2.
2. No : REFER to INTERIOR LIGHTING to continue diagnosis on the interior lamps.
Q2 CARRY OUT THE INSTRUMENT CLUSTER WARNING LAMPS AND CHIME ACTIVE COMMAND
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command.
- Select the instrument cluster warning lamps and chime active command. Trigger the all lamps active command ON and OFF. Observe the door ajar warning indicator.
- Does the door ajar warning indicator illuminate when triggered ON, and turn off when triggered OFF?
1. Yes : GO to Q3.
2. No : GO to Q7.
Q3 CHECK THE DOOR AJAR SWITCHES FOR INPUT
- Key in OFF position.
- Disconnect: SJB C2280c.
- Disconnect: SJB C2280d.
- Key in ON position.
- Measure the voltage between the SJB C2280c pin 2, circuit 1312 (LG/BK), harness side and ground.
  
  Fig 1: Checking Door Ajar Switches For Input (1 Of 2)
  Courtesy of FORD MOTOR CO.
- Measure the voltage between the SJB C2280d pin 4, circuit 1314 (YE/LG), harness side and ground.
  
  Fig 2: Checking Door Ajar Switches For Input (2 Of 2)
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 8.3 volts?
1. Yes : GO to Q6.
2. No : If the driver circuit is suspected, GO to Q4.
  If the passenger circuit is suspected, GO to Q5.
Q4 CHECK CIRCUIT 1312 (LG/BK) FOR AN OPEN
- Key in OFF position.
- Disconnect: Instrument Cluster C220a.
- Measure the resistance between the instrument cluster C220a pin 2, circuit 1312 (LG/BK), harness side and the SJB C2280c pin 2, circuit 1312 (LG/BK), harness side.
  
  Fig 3: Checking Circuit 1312 (LG/BK) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
1. Yes : GO to Q7.
2. No : REPAIR the circuit. TEST the system for normal operation.
Q5 CHECK CIRCUIT 1314 (YE/LG) FOR AN OPEN
- Key in OFF position.
- Disconnect: SJB C2280d.
- Measure the resistance between the instrument cluster C220a pin 3, circuit 1314 (YE/LG), harness side and the SJB C2280d pin 4, circuit 1314 (YE/LG) harness side.
  
  Fig 4: Checking Circuit 1314 (YE/LG) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
1. Yes : GO to Q7.
2. No : REPAIR the circuit. TEST the system for normal operation.
Q6 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?
1. Yes : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC CONTROL MODULES . CLEAR the DTCs. REPEAT the self-test.
2. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
Q7 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect all the instrument cluster connectors.
- Check for:
- Corrosion
- Pushed-out pins
- Connect all the instrument cluster 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 instrument cluster. REFER to INSTRUMENT CLUSTER . CLEAR the DTCs. REPEAT the instrument cluster self-test.
2. No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.