Pinpoint Test N : B1B50:08, B1B50:31 And B1B50:1F

N1 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 N2

No	* For Diagnostic Trouble Codes (DTCs) B1B50:08, B1B50:31, or B1B50:1F GO to N3 * For all other PAM Diagnostic Trouble Codes (DTCs), REFER to DTC Chart: Parking Aid Module (PAM) in this information.

N2 CHECK THE REAR BUMPER WIRING HARNESS
- 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 FOR VOLTAGE TO THE SENSOR

Ignition OFF.

Disconnect left rear inner parking aid sensor C4545.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Refer to C4545-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 9.5 volts?

Yes

GO to N4

No	REPAIR the circuit.

N4 CHECK FOR GROUND AT THE SENSOR

Measure:

Positive Lead	Measurement / Action	Negative Lead
Refer to C4545-1	Courtesy of FORD MOTOR COMPANY	Refer to C4545-3

Is the voltage greater than 9.5 volts?

Yes

GO to N5

No	REPAIR the circuit.

N5 CHECK THE SENSOR FOR A SHORT TO GROUND

Ignition OFF.

Disconnect left rear inner parking aid sensor C4545.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Refer to C4545-2	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to N6

No	REPAIR the circuit.

N6 CHECK THE SENSOR FOR A SHORT TO POWER

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Refer to C4545-2	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the affected circuits.

GO to N7

N7 CHECK THE SENSOR FOR A SHORT TO VREF OR SIGNAL RETURN CIRCUITS

Ignition OFF.

Disconnect PAM C4226A.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Refer to C4545-2	Courtesy of FORD MOTOR COMPANY	Refer to C4545-1
Refer to C4545-2	Courtesy of FORD MOTOR COMPANY	Refer to C4545-3

Are the resistances greater than 10, 000 ohms?

Yes

GO to N8

No	REPAIR the affected circuits.

N8 CHECK THE SENSOR CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect left rear inner parking aid sensor C4545.

Disconnect PAM C4226A.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Refer to C4545-1	Courtesy of FORD MOTOR COMPANY	Refer to C4226A-3
Refer to C4545-2	Courtesy of FORD MOTOR COMPANY	Refer to C4226A-6
Refer to C4545-3	Courtesy of FORD MOTOR COMPANY	Refer to C4226A-10

Are the resistances less than 3 ohms?

Yes

GO to N9

No	REPAIR the affected circuit.

N9 INSTALL A KNOWN GOOD SENSOR
- Connect PAM C4226A.
- Install a known good sensor for the left rear inner parking aid sensor. REFER to: Front Active Park Assist Sensors .
- Ignition ON.
- Using a diagnostic scan tool, clear the PAM Diagnostic Trouble Codes (DTCs) and repeat the self-test.
Is DTC B1B50:08, B1B50:31B or B1B50:1F still present?

Yes GO to N10

No INSTALL a new left rear inner parking aid sensor. REFER to: Front Active Park Assist Sensors .

N10 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.