Pinpoint Test D: C1006:11, C1006:12, C1006:13, C1006:19

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Refer to POWER TAILGATE/RETRACTABLE RUNNING BOARDS for schematic and connector information.

Normal Operation and Fault Conditions

The DSM determines the need to move the LHPRB and applies voltage and ground on only 2 circuits to the PRB motor in order to stow (retract) or deploy (extend) the PRB. To stow the PRB, the DSM applies voltage on the LEFT RB STOW circuit and ground on the LEFT RB DEPLOY circuit. To deploy the PRB switches the voltage and ground so the voltage is applied to the LEFT RB DEPLOY circuit and ground to the LEFT RB STOW circuit. The DSM monitors the PRB motor current draw while it is operating. These Diagnostic Trouble Codes (DTCS) will set if the circuits are interrupted or if the PRB motor current is above 45 Amps.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
DSM C1006:11	Left Power Running Board Motor: Circuit Short To Ground	This DTC sets if the LHPRB motor stow or deploy circuit is shorted to ground when a movement is requested.
DSM C1006:12	Left Power Running Board Motor: Circuit Short To Battery	This DTC sets if the LHPRB motor stow or deploy circuit is shorted to voltage when a movement is requested.
DSM C1006:13	Left Power Running Board Motor: Circuit Open	This DTC sets if the LHPRB motor stow or deploy circuit is open when a movement is requested.
DSM C1006:19	Left Power Running Board Motor: Circuit Current Above Threshold	This DTC sets if the LHPRB motor current draw is above excessive.

Possible Sources

Wiring, terminals or connectors
LHPRB motor
DSM

Visual Inspection and Pre-checks

LHPRB motor harness connections and wiring.

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

D1 CHECK THE LH (LEFT-HAND) PRB (POWER RUNNING BOARD) MOTOR CONTROL CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect Left PRB motor C3185A.

Ignition ON.

Wait 10 seconds so any PRB movement commands are complete.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3185A-1	Courtesy of FORD MOTOR COMPANY	Ground
C3185A-3	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit.

GO to D2

D2 CHECK THE LH (LEFT-HAND) PRB (POWER RUNNING BOARD) MOTOR CONTROL CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3185A-1	Courtesy of FORD MOTOR COMPANY	Ground
C3185A-3	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 Ohms?

Yes

GO to D3

No	REPAIR the circuit.

D3 CHECK THE LH (LEFT-HAND) PRB (POWER RUNNING BOARD) MOTOR CONTROL CIRCUITS FOR AN OPEN

Disconnect DSM C341D.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3185A-1	Courtesy of FORD MOTOR COMPANY	C341D-14
C3185A-3	Courtesy of FORD MOTOR COMPANY	C341D-13

Are the resistances less than 3 Ohms?

Yes

GO to D4

No	REPAIR the circuit.

D4 CHECK THE LH (LEFT-HAND) PRB (POWER RUNNING BOARD) MOTOR CIRCUITS FOR A SHORT TOGETHER

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3185A-1	Courtesy of FORD MOTOR COMPANY	C3185A-3
C3185A-1	Courtesy of FORD MOTOR COMPANY	C3185A-5
C3185A-1	Courtesy of FORD MOTOR COMPANY	C3185A-6
C3185A-1	Courtesy of FORD MOTOR COMPANY	C3185A-4
C3185A-3	Courtesy of FORD MOTOR COMPANY	C3185A-5
C3185A-3	Courtesy of FORD MOTOR COMPANY	C3185A-6
C3185A-3	Courtesy of FORD MOTOR COMPANY	C3185A-4
C3185A-5	Courtesy of FORD MOTOR COMPANY	C3185A-6
C3185A-5	Courtesy of FORD MOTOR COMPANY	C3185A-4
C3185A-6	Courtesy of FORD MOTOR COMPANY	C3185A-4

Are the resistances greater than 10, 000 ohms?

Yes

GO to D5

No	REPAIR the circuit.

D5 CHECK FOR CORRECT DSM (DRIVER FRONT SEAT MODULE) OUTPUT

NOTE: Use a meter with a min-max feature or recording capabilities to obtain accurate measurements. The DSM disables the voltage output immediately if the PRB motor is not present

Connect DSM C341D.

Ignition ON.

Make sure the PRB is set to AUTO in the vehicle message center.

Close all vehicle doors.

Connect the meter to the LHPRB motor electrical connector, harness side.

Set the meter to measure DC (direct current) voltage.

Set the meter range to greater than 15 volts.

Enable the min-max or recording feature on the meter.

NOTE: Make sure all test connections are made at the PRB motor before the LH door is opened.

Open any LH side door.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3185A-3	Courtesy of FORD MOTOR COMPANY	C3185A-1

Is the voltage greater than 10 volts?

Yes	REPLACE the PRB motor. REFER to: Power Running Board (PRB) Motor .

GO to D6

D6 CHECK FOR CORRECT RBM (RUNNING BOARD CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect All PRB system and related in-line connectors.

Check for:
- corrosion - install new connector or terminals and clean module pins
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all PRB system and related in-line connectors and make sure they seat correctly.

Operate the system and verify 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 TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new DSM. REFER to: Driver Front Seat Module (DSM) .

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.