Possible Causes

WARNING: This page is about a different car, the 2020 Ford EcoSport and 2019 Ford EcoSport. However, it is still accessible from the selected car via links, so may be relevant.

Wiring, terminals or connectors
Network communication concern
Door ajar switch

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

Fig 1: Antilock Braking System (ABS) Module Connector - C135

Courtesy of FORD MOTOR COMPANY

Harness Side

Circuit

CJ1: RECHECK THE ABS MODULE DTCS

Ignition ON, engine OFF.
Carry out the ABS self-test.
Retrieve and record all ABS module DTCs.
Is DTC P166B:62 currently present and active in the ABS module?

Yes	No
Go to CJ2.	The condition causing the concern is not present at this time. RETURN to the ABS module DTC chart and DIAGNOSE all other ABS module DTCs.

CJ2: CHECK FOR DTCS IN THE BCM

Carry out the BdyCM self-test.

Retrieve and record all BCM DTCs.
Are there any DTCs currently present and active in the BCM?

Yes	No
DIAGNOSE all BCM DTCs before diagnosing ABS module DTC P166B:62. REFER to the Multifunction Electronic Modules article.	Go to CJ3.

CJ3: CHECK THE DOOR LOCK STATUS CIRCUIT FOR AN OPEN

Ignition OFF.
ABS Module connector disconnected. (C135)
Front Door Latch LH connector disconnected.

Measure the resistance between:

(+) ABS Module (C135) Connector, Harness Side	(-) Front Door Latch LH Connector, Harness Side
D_DOOR	D_DOOR

Is the resistance less than 3 ohms?

Yes	No
Go to CJ4.	REPAIR the circuit.

CJ4: CHECK THE DOOR LOCK STATUS CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between:

(+) Front Door Latch LH Connector, Harness Side	(-)
D_DOOR	Ground

Is the resistance greater than 10, 000 ohms?

Yes	No
INSTALL a new front door latch assembly. REFER to the Handles, Locks, Latches and Entry Systems article.	REPAIR the circuit.