Pinpoint Test D: The Start/Stop Switch Illumination Is Inoperative Or Always On

D1 VERIFY THE HARDWIRED ILLUMINATION
- Ignition ON.
- Turn the parking lamps on.
- While pressing the dimmer switch up and down, monitor the start/stop switch illumination and the steering wheel switch illumination.
- Turn the parking lamps off.
- Ignition OFF.
- Is the steering wheel switch AND the start/stop switch illumination inoperative or always on?
- Yes : GO to PINPOINT TEST A .
- No : If the start/stop switch illumination is inoperative, GO to D2.
  If the start/stop switch illumination is always on, GO to D6.

D2 CHECK THE FOR GROUND AT THE START/STOP SWITCH

Ignition OFF.
Disconnect: Start/Stop Switch.
Using the Terminal Release Kit, release and temporarily remove the start/stop switch connector pin 1, circuit CPL36 (VT/BN).

Fig 1: Identifying Start/Stop Switch Connector Terminals
Courtesy of FORD MOTOR CO.
Connect: Start/Stop Switch.
Ignition ON.
Turn the parking lamps on.
Press the dimmer switch up until the instrument panel illumination reaches full brightness.

Measure the voltage between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
-	Battery positive	C2195-1	CPL36 (VT/BN)

Fig 2: Identifying Start/Stop Switch Connector Terminals

Courtesy of FORD MOTOR CO.

Is the voltage greater than 11 volts?

Yes : INSTALL pin 1 into the start/stop switch connector. INSTALL a new start/stop switch. REFER to STEERING COLUMN SWITCHES .
No : GO to D3.

D3 CHECK THE BCM DTCs
- Using a scan tool, clear the BCM DTCs.
- Wait 10 seconds.
- Perform the BCM self-test.
- Is DTC B1249:12 present?
- Yes : GO to D4.
- No : GO to D5.

D4 CHECK THE START/STOP SWITCH ILLUMINATION CIRCUIT FOR A SHORT TO VOLTAGE AT THE START/STOP SWITCH

Measure the voltage between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C2195-1	CPL36 (VT/BN)	-	Ground

Fig 3: Identifying Start/Stop Switch Connector Terminals

Courtesy of FORD MOTOR CO.

Is any voltage present?

Yes : INSTALL pin 1 into the start/stop switch connector. REPAIR the circuit.
After the repair:

If DTC U1000:00 is present in the BCM, CLEAR the DTCs and REPEAT the self-test (required to enable the illumination output driver when DTC U1000:00 is stored in the BCM).

If DTC U3000:49 is present in the BCM, INSTALL a new BCM after all other DTCs have been addressed. REFER to MULTIFUNCTION ELECTRONIC MODULES .
No : GO to D7.

D5 CHECK THE START/STOP SWITCH ILLUMINATION CIRCUIT FOR AN OPEN BETWEEN THE START/STOP SWITCH AND THE BCM

Ignition OFF.
Disconnect: Start/Stop Switch.
Disconnect: BCM C2280C.

Measure the resistance between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C2195-1	CPL36 (VT/BN)	C2280C-12	CPL36 (VT/BN)

Fig 4: Checking Start/Stop Switch Illumination Circuit For Open Between Start/Stop Switch And BCM

Courtesy of FORD MOTOR CO.

Is the resistance less than 3 ohms?

Yes : INSTALL pin 1 into the start/stop switch connector. GO to D7.
No : INSTALL pin 1 into the start/stop switch connector. REPAIR the circuit.

D6 CHECK THE START/STOP SWITCH ILLUMINATION CIRCUIT FOR A SHORT TO GROUND AT THE START/STOP SWITCH

Ignition OFF.
Disconnect: BCM C2280C.
Disconnect: Start/Stop Switch.

Measure the resistance between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C2195-1	CPL36 (VT/BN)	-	Ground

Is the resistance greater than 10, 000 ohms?

Yes : GO to D7.
No : REPAIR the circuit.

D7 CHECK FOR CORRECT BCM OPERATION
- Disconnect and inspect all BCM connectors.
- Repair:
  - Corrosion (install new connectors or terminals - clean module pins)
  - Damaged or bent pins - install new terminals/pins
  - Pushed-out pins - install new pins as necessary
- Reconnect the BCM connectors and the start/stop switch connector. Make sure all connectors seat and latch correctly.
- Operate the system to determine if the concern is still present.
- Is the concern still present?
- Yes : CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSB addresses this concern, INSTALL a new BCM. REFER to MULTIFUNCTION ELECTRONIC MODULES .
- No : The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.