Pinpoint Test C: DTC B1B44:12, B1B46:12, B1B48:12 Or B1B50:12

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

C1 RETRIEVE THE DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND PAM SELF-TESTS
- Using a scan tool, perform the PAM self-tests.
Are multiple DTCs recorded?
- Yes : GO to C2 .
- No : GO to C3.
C2 CHECK THE BUMPER WIRING HARNESS
- Inspect the bumper wiring harness for opens, shorts, grounds, or corrosion.
Is the bumper wiring harness OK?
- Yes : GO to C3 .
- No : REPAIR or INSTALL a new bumper wiring harness.

C3 CHECK THE REAR SENSOR CIRCUITRY FOR SHORTS TO VOLTAGE

Ignition OFF.
Disconnect: Suspect Parking Aid Sensor C4009 , C4010 , C4011 and/or C4012 .
Disconnect: PAM C4014 .
Ignition ON.

Measure the voltage between:

Positive	Lead	Negative	Lead
Pin	Circuit	Pin	Circuit
DTC B1B44:12
C4011-2	VMP17 (YE/OG)	-	Ground
DTC B1B46:12
C4012-2	VMP16 (YE/GY)	-	Ground
DTC B1B48:12
C4009-2	VMP15 (YE/GN)	-	Ground
DTC B1B50:12
C4010-2	VMP14 (WH/OG)	-	Ground

Fig 1: Checking Rear Sensor Circuit

Courtesy of FORD MOTOR CO.

Is any voltage present?

Yes : REPAIR the circuit in question.
No : If all sensor DTCs are set, GO to C5.
Otherwise, GO to C4 .

C4 CHECK THE PARKING AID SENSORS
- Install a known good parking aid sensor(s) for each of the suspect parking aid sensor(s).
- Using a scan tool, clear the DTCs. Repeat the self-test.
- Test the system for normal operation.
Is the concern still present?
- Yes : GO to C5 .
- No : If one or more parking aid sensor(s) recorded DTCs, INSTALL a new sensor(s) for the one in question. REFER to PARKING AID SENSOR .
C5 CHECK FOR CORRECT PAM OPERATION
- Disconnect and inspect the PAM connector.
- Repair:
  - corrosion (install new connector or terminals - clean module pins)
  - damaged pins - install new terminals/pins
  - pushed-out pins - install new pins as necessary
- Reconnect the PAM connector. Make sure it seats and latches correctly.
- Operate the system and 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 TSB instructions. If no TSBs address this concern, INSTALL a new PAM . REFER to PARKING AID MODULE (PAM) .
- 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.