Pinpoint Test D: The Courtesy Lamps Stay On Continuously

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

D1 CHECK THE RECORDED DTCs FROM THE SJB SELF-TEST
- Check the recorded results from the SJB self-test.
- Is DTC B1319 or B1327 present?
1. YES : Go to D2.
2. NO : Go to D5.

D2 CHECK THE AJAR SIGNAL CIRCUIT FOR GROUND

Key in OFF position.
Disconnect: SJB C2280e

Fig 1: Checking Ajar Signal Circuits For Ground

Courtesy of FORD MOTOR CO.

NOTE: Make sure the doors are closed.

Measure the resistance between the SJB, harness side and ground as follows:

DTC	Location	Connector-Pin/ Circuit
B1319	LH door	C2280e-2 1312 (LG/BK)
B1327	RH door	C2280e-6 1314 (YE/LG)

Is the resistance less than 5 ohms?

YES : Go to D9.
NO : Go to D3.

D3 CHECK CIRCUIT 1205 (BK) FOR AN OPEN

Disconnect: Suspect Door Ajar Switch

Fig 2: Checking Circuit 1205 (BK) For Open

Courtesy of FORD MOTOR CO.

Measure the resistance between the suspect door ajar switch, harness side and ground as follows:

DTC	Location	Connector-Pin/ Circuit
B1319	LH door	C526-1 1205 (BK)
B1327	RH door	C602-1 1205 (BK)

Is the resistance less than 5 ohms?

YES : Go to D4.
NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

D4 CHECK THE DOOR AJAR SIGNAL CIRCUIT FOR AN OPEN

Fig 3: Checking The Door Ajar Signal Circuit For An Open

Courtesy of FORD MOTOR CO.

Measure the resistance between the suspect door ajar switch, harness side and the SJB, harness side as follows:

DTC	Location	SJB Connector- Pin/Circuit	Ajar Switch Connector- Pin/Circuit
B1319	LH door	C2280e-2 1312 (LG/BK)	C526-2 1312 (LG/BK)
B1327	RH door	C2280e-6 1314 (YE/LG)	C602-2 1314 (YE/LG)

Is the resistance less than 5 ohms?

YES : INSTALL a new ajar switch in question. CLEAR the DTCs. REPEAT the self-test.
NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

D5 CHECK THE DIMMER SWITCH
- Key in OFF position.
- Disconnect: Dimmer Switch C2298
- Does the dome lamp turn off?
1. YES : INSTALL a new dimmer switch. TEST the system for normal operation.
2. NO : Go to D6.
D6 CHECK CIRCUIT 2085 (VT/YE) FOR A SHORT TO GROUND
- Disconnect: SJB C2280b
- Measure the resistance between the dimmer switch C2298-5, circuit 2085 (VT/YE), harness side and ground.
- Is the resistance greater than 10,000 ohms?
1. YES : Go to D7.
2. NO : REPAIR the circuit. TEST the system for normal operation.
D7 CHECK THE DOME LAMP CONTROL GROUND CIRCUIT FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: SJB C2280f
- Measure the resistance between the SJB C2280f-25, circuit 54 (LG/YE), harness side and ground.
- Is the resistance greater than 10,000 ohms?
1. YES : Go to D9.
2. NO : Go to D8.
D8 CHECK CIRCUIT 54 (LG/YE) FOR A SHORT TO GROUND
- Disconnect: Overhead Console C930
- Disconnect: Overhead Console (With Convertible Top) C9013
- Measure the resistance between the SJB C2280f-25, circuit 54 (LG/YE), harness side and ground.
- Is the resistance greater than 10,000 ohms?
1. YES : INSTALL a new overhead console. TEST the system for normal operation.
2. NO : REPAIR the circuit. TEST the system for normal operation.
D9 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
  - corrosion
  - damaged pins
  - 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 MODULES . 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.