Pinpoint Test C: DTC B129C:12 Or DTC B129D:12

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. 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 damage the connector.

C1 RETRIEVE THE DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND PAM SELF-TESTS
- Check for PAM DTCs from the continuous and on-demand self-tests.
- Are multiple DTCs recorded?
- Yes: GO to C2 .
- No: For DTC B129C:12 or DTC B129D:12, GO to C3.
  For all other DTCs, REFER to DTC CHARTS .
C2 CHECK THE BUMPER WIRING HARNESS
- Inspect the front 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. CLEAR the DTCs. TEST the system for normal operation.

C3 CHECK THE ACTIVE PARK ASSIST SENSOR CIRCUITRY FOR SHORTS TO VOLTAGE

Ignition OFF.
Disconnect: Suspect Active Park Assist Sensor C1607 (Left) and/or C1608 (Right).
Disconnect: PAM C4014.
Ignition ON.

Measure the voltage between the suspect active park assist sensor, harness side and ground as follows:

CONNECTOR-PIN REFERENCE CHART

DTC	Active Park Assist Sensor	Connector-Pin	Circuit
B129C:14	Left	C1607-1	LMP07 (BU/WH)
B129C:14	Left	C1607-2	VMP20 (GY/OG)
B129D:14	Right	C1608-1	LMP07 (BU/WH)
B129D:14	Right	C1608-2	VMP21 (WH/BN)

Fig 1: Measuring Voltage Between Suspect Active Park Assist Sensor, Harness Side And Ground

Courtesy of FORD MOTOR CO.

Is any voltage present?

Yes: REPAIR the circuit in question. CLEAR the DTCs. TEST the system for normal operation.
No: GO to C4 .

C4 CHECK THE ACTIVE PARK ASSIST SENSOR CIRCUITRY FOR A SHORT TOGETHER

Measure the resistance between the suspect active park assist sensor, harness side and the suspect active park assist sensor, harness side as follows:

CONNECTOR-PIN REFERENCE CHART

DTC	Active Park Assist Sensor	Connector-Pin/Circuit	Connector-Pin/Circuit
B129C:14	Left	C1607-2 VMP20 (GY/OG)	C1607-1 LMP07 (BU/WH)
B129D:14	Right	C1608-2 VMP21 (WH/BN)	C1608-1 LMP07 (BU/WH)

Fig 2: Measuring Resistance Between Suspect Active Park Assist Sensor And Suspect Active Park Assist Sensor, Harness Side

Courtesy of FORD MOTOR CO.

Is the resistance greater than 10,000 ohms?

Yes: If both sensor DTCs are set, GO to C6.
Otherwise, GO to C5 .
No: REPAIR the circuits in question. CLEAR the DTCs. TEST the system for normal operation.

C5 CHECK THE ACTIVE PARK ASSIST SENSORS
- Install a known good active park assist sensor for the suspect active park assist sensor.
- Clear the DTCs. Repeat the self-test.
- Test the system for normal operation.
- Is the concern still present?
- Yes: GO to C6 .
- No: INSTALL a new active park assist sensor (s) for the one in question. REFER to ACTIVE PARK ASSIST SENSOR . CLEAR the DTCs. TEST the system for normal operation.
C6 CHECK FOR CORRECT PAM OPERATION
- Disconnect the PAM connector.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect the PAM connector and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
- Yes: INSTALL a new PAM . REFER to PARKING AID MODULE (PAM) . TEST the system for normal operation.
- No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.