PINPOINT TEST B: DTCs C1700, C1703, C1706 AND C1709 - PARKING AID SENSOR CIRCUIT FAILURE OR BLOCKAGE

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

B1 RETRIEVE THE DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND PARKING AID MODULE SELF-TESTS
- Check the parking aid module DTCs from the continuous and on-demand self-tests.
- Are multiple DTCs recorded?
1. YES : Go to B2 .
2. NO : For DTCs C1700, C1703, C1706 or C1709, go to B3 .
  For all other DTCs, REFER to the Parking Aid Module Diagnostic Trouble Code (DTC) Index in this article.
B2 CHECK THE BUMPER WIRING HARNESS
- Inspect the bumper wiring harness for opens, shorts, grounds, or corrosion.
- Is the bumper wiring harness OK?
1. YES : Go to B3.
2. NO : REPAIR or INSTALL a new bumper wiring harness. REPEAT the self-test.

B3 CHECK THE SENSOR CIRCUITRY FOR OPENS

Key in OFF position.
Disconnect: Suspect Parking Aid Sensor C4009, C4010, C4011 or C4012
Disconnect: Parking Aid Module C2023

Measure the resistance between the parking aid module, harness side and the suspect parking aid sensor, harness side as follows:

DTC	Rear Sensor	Parking Aid Module Connector -Pin	Sensor Connector -Pin	Circuit
C1700	LH outer	C2023-9	C4009-1	1439 (BN/PK)
C1700	LH outer	C2023-15	C4009-2	1441 (WH/LG)
C1700	LH outer	C2023-12	C4009-3	1440 (DG/YE)
C1703	RH outer	C2023-9	C4011-1	1439 (BN/PK)
C1703	RH outer	C2023-16	C4011-2	1444 (DB/YE)
C1703	RH outer	C2023-12	C4011-3	1440 (DG/YE)
C1706	LH inner	C2023-9	C4010-1	1439 (BN/PK)
C1706	LH inner	C2023-14	C4010-2	1442 (DG/WH)
C1706	LH inner	C2023-12	C4010-3	1440 (DG/YE)
C1709	RH inner	C2023-9	C4012-1	1439 (BN/PK)
C1709	RH inner	C2023-13	C4012-2	1443 (WH/LB)
C1709	RH inner	C2023-12	C4012-3	1440 (DG/YE)

Are the resistances less than 5 ohms?

YES : Go to B4.
NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

B4 CHECK THE SENSOR CIRCUITRY FOR SHORTS TO GROUND

Measure the resistance between the suspect parking aid sensor harness side and ground as follows:

DTC	Rear Sensor	Connector -Pin	Circuit
C1700	LH outer	C4009-2	1441 (WH/LG)
C1703	RH outer	C4011-2	1444 (DB/YE)
C1706	LH inner	C4010-2	1442 (DG/WH)
C1709	RH inner	C4012-2	1443 (WH/LB)

Is the resistance greater than 10,000 ohms?

YES : If all of the parking aid sensors recorded DTCs, go to B5 .
If one or more parking aid sensor(s) recorded DTCs, INSTALL a new sensor(s) for the one in question. REFER to Parking Aid Sensor in this article. TEST the system for normal operation.
NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

B5 CHECK FOR CORRECT PARKING AID MODULE OPERATION
- Disconnect the parking aid module connector.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect the parking aid module connector and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
1. YES : INSTALL a new parking aid module. REFER to Parking Aid Module in this article. CLEAR the DTCs. REPEAT the self-test.
2. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.