Pinpoint Test M: B1B48:08, B1B48:31 And B1B48:1F

M1 CHECK 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 Diagnostic Trouble Codes (DTCs) for multiple front parking aid sensors recorded?

Yes

GO to M2

No	* For Diagnostic Trouble Codes (DTCs) B1B48:08, B1B48:31, or B1B48:1F GO to M3 * For all other PAM Diagnostic Trouble Codes (DTCs), Refer to the DTC Chart: Parking Aid Module (PAM) .

M2 CHECK THE REAR BUMPER WIRING HARNESS
- Inspect the front bumper wiring harness for opens, shorts, grounds or corrosion.
Is the rear bumper wiring harness OK?

Yes GO to M3

No REPAIR or INSTALL a new rear bumper wiring harness.

M3 CHECK FOR VOLTAGE TO THE SENSOR

Ignition OFF.

Disconnect left rear outer parking aid sensor C4544.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4544-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 9.5 volts?

Yes

GO to M4

No	REPAIR the circuit.

M4 CHECK FOR GROUND AT THE SENSOR

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4544-1	Courtesy of FORD MOTOR COMPANY	C4544-3

Is the voltage greater than 9.5 volts?

Yes

GO to M5

No	REPAIR the circuit.

M5 CHECK THE SENSOR FOR A SHORT TO GROUND

Ignition OFF.

Disconnect left rear outer parking aid sensor C4544.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4544-2	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to M6

No	REPAIR the circuit.

M6 CHECK THE SENSOR FOR A SHORT TO POWER

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4544-2	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the affected circuits.

GO to M7

M7 CHECK THE SENSOR FOR A SHORT TO VREF OR SIGNAL RETURN CIRCUITS

Ignition OFF.

Disconnect PAM C4226A.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4544-2	Courtesy of FORD MOTOR COMPANY	C4544-1
C4544-2	Courtesy of FORD MOTOR COMPANY	C4544-3

Are the resistances greater than 10, 000 ohms?

Yes

GO to M8

No	REPAIR the affected circuits.

M8 CHECK THE SENSOR CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect left rear outer parking aid sensor C4544.

Disconnect PAM C4226A.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4544-1	Courtesy of FORD MOTOR COMPANY	C4226A-3
C4544-2	Courtesy of FORD MOTOR COMPANY	C4226A-16
C4544-3	Courtesy of FORD MOTOR COMPANY	C4226A-10

Are the resistances less than 3 ohms?

Yes

GO to M9

No	REPAIR the affected circuit.

M9 INSTALL A KNOWN GOOD SENSOR

Connect PAM C4226A.

Install a known good sensor for the left rear outer parking aid sensor. Refer to: Rear Parking Aid Sensor .

Ignition ON.

Using a diagnostic scan tool, clear the PAM Diagnostic Trouble Codes (DTCs) and repeat the self-test.

Is DTC B1B48:08, B1B48:31B or B1B48:1F still present?

Yes

GO to M10

No	INSTALL a new left rear outer parking aid sensor. Refer to: Rear Parking Aid Sensor .

M10 CHECK FOR CORRECT PAM (PARKING ASSIST CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all PAM 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 PAM 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, INSTALL a new PAM. Refer to: Parking Assist Control Module (PAM) .

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.