Pinpoint Test A : DTC (Diagnostic Trouble Code) B129C:12, DTC (Diagnostic Trouble Code) B129D:12

WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector. Use only Rotunda Flex Probes (NUD105-R025D)

A1 CHECK THE DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE PAM (PARKING ASSIST CONTROL MODULE) SELF-TEST
- Using a diagnostic scan tool, perform the PAM self-test.
- Check the PAM Diagnostic Trouble Codes (DTCs) from the self-test.
Are LH and RH front active park assist sensor Diagnostic Trouble Codes (DTCs) recorded?

Yes GO to A2

No For DTC B129C:12 or DTC B129D:12, GO to A3 For all other PAM Diagnostic Trouble Codes (DTCs), REFER to: Parking Aid .

A2 CHECK THE ENGINE COMPARTMENT WIRING HARNESS
- Inspect the engine compartment wiring harness for opens, shorts, grounds or corrosion.
Is the engine compartment wiring harness OK?

Yes GO to A3

No REPAIR or INSTALL a new engine compartment wiring harness.

A3 CHECK THE SENSOR SIGNAL RETURN CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect suspect active park assist sensor(s) (DTC B129C:12) C1428 or (DTC B129D:12) C1430.

Disconnect BCM C2280F.

Ignition ON.

Measure:

DTC B129C:12

Positive Lead	Measurement / Action	Negative Lead
C1428-2	Courtesy of FORD MOTOR COMPANY	Ground

DTC B129D:12

Positive Lead	Measurement / Action	Negative Lead
C1430-2	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit.

GO to A4

A4 CHECK THE SENSOR VOLTAGE SUPPLY AND SIGNAL RETURN CIRCUITS FOR A SHORT TOGETHER

Ignition OFF.

Measure:

DTC B129C:12

Positive Lead	Measurement / Action	Negative Lead
C1428-2	Courtesy of FORD MOTOR COMPANY	C1428-1

DTC B129D:12

Positive Lead	Measurement / Action	Negative Lead
C1430-2	Courtesy of FORD MOTOR COMPANY	C1430-1

Is the resistance greater than 10, 000 ohms?

Yes

GO to A5

No	REPAIR the affected circuits.

A5 CHECK THE ACTIVE PARK ASSIST SENSOR
- Connect BCM C2280F.
- Ignition ON.
- Using a diagnostic scan tool, clear the PAM Diagnostic Trouble Codes (DTCs) and repeat the self-test.
Is DTC B129C:12 or B129D:12 still present?

Yes GO to A6

No INSTALL a new active park assist sensor for the one in question. REFER to: Front Active Park Assist Sensors .

A6 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all BCM connectors and related in-line 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 and related in-line 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 Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, Refer to BCM GUIDED ROUTINE .

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.