Pinpoint Test N : B1B44:12, B1B46:12, B1B48:12, B1B50:12

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

N1 RETRIEVE THE DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE PAM (PARKING ASSIST CONTROL MODULE) SELF-TEST

Ignition ON.

Using a diagnostic scan tool, perform the PAM self-test.

Check the PAM Diagnostic Trouble Codes (DTCs) from the self-test.

Are multiple rear parking aid sensor Diagnostic Trouble Codes (DTCs) recorded?

Yes

GO to N2

No	For Diagnostic Trouble Codes (DTCs) B1B44:12, B1B46:12, B1B48:12 or B1B50:12, GO to N3 For all other Diagnostic Trouble Codes (DTCs), REFER to DTC Chart: Parking Aid Module (PAM) .

N2 CHECK THE REAR BUMPER WIRING HARNESS
- Ignition OFF.
- Inspect the rear bumper wiring harness for opens, shorts, grounds, or corrosion.
Is the rear bumper wiring harness OK?

Yes GO to N3

No REPAIR or INSTALL a new rear bumper wiring harness.

N3 CHECK THE REAR PARKING AID SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect: Suspect Parking Aid Sensor(s).

Disconnect: BCM C2280D

Ignition ON.

For DTC B1B44:12, measure:

Positive Lead	Measurement / Action	Negative Lead
C4011-2	Courtesy of FORD MOTOR COMPANY	Ground

For DTC B1B46:12, measure:

Positive Lead	Measurement / Action	Negative Lead
C4012-2	Courtesy of FORD MOTOR COMPANY	Ground

For DTC B1B48:12, measure:

Positive Lead	Measurement / Action	Negative Lead
C4009-2	Courtesy of FORD MOTOR COMPANY	Ground

For DTC B1B50:12, measure:

Positive Lead	Measurement / Action	Negative Lead
C4010-2	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit.

GO to N4

N4 CHECK THE REAR PARKING AID SENSOR SIGNAL AND VREF CIRCUITS FOR A SHORT TOGETHER

Ignition OFF.

For DTC B1B44:12, measure:

Positive Lead	Measurement / Action	Negative Lead
C4011-2	Courtesy of FORD MOTOR COMPANY	C4011-1

For DTC B1B46:12, measure:

Positive Lead	Measurement / Action	Negative Lead
C4012-2	Courtesy of FORD MOTOR COMPANY	C4012-1

For DTC B1B48:12, measure:

Positive Lead	Measurement / Action	Negative Lead
C4009-2	Courtesy of FORD MOTOR COMPANY	C4009-1

For DTC B1B50:12, measure:

Positive Lead	Measurement / Action	Negative Lead
C4010-2	Courtesy of FORD MOTOR COMPANY	C4010-1

Is the resistance greater than 10, 000 ohms?

Yes	If all the sensor Diagnostic Trouble Codes (DTCs) are set, GO to N5If one or more (but not all) parking aid sensor(s) recorded Diagnostic Trouble Codes (DTCs), INSTALL a new sensor(s) for the one in question. REFER to: Rear Parking Aid Sensor .

No	REPAIR the circuit.

N5 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all BCM connectors.

Repair:
- corrosion (install new connector 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. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, BCM guided routine is not applicable for this vehicle and market. Replace the component that was faulted through service information diagnosis.

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.