Pinpoint Test Q: The Parking Aid Switch Function Led (Light Emitting Diode) Is Inoperative Or Always On

Refer to Wiring Diagrams PARKING AID for schematic and connector information.

Normal Operation and Fault Conditions

The PAM supplies voltage to the parking aid disable switch LED when the parking aid system has been disabled using the switch.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PAM B1B54:11	Function LED - Park Aid: Circuit Short To Ground	A continuous and on-demand DTC that sets when the parking aid disable status LED circuit is shorted to ground.
PAM B1B54:15	Function LED - Park Aid: Circuit Short To Battery Or Open	A continuous and on-demand DTC that sets when the parking aid disable status LED circuit is shorted battery voltage or open.

Possible Sources

Wiring, terminals or connectors
Parking aid disable switch
PAM

Q1 RETRIEVE THE DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE PAM (PARKING ASSIST CONTROL MODULE) SELF-TEST
- Ignition ON.
- Using a diagnostic scan tool, perform the PAM self-test.
Is DTC B1B54:11 present?

Yes GO to Q4

No If the LED is inoperative, GO to Q3 If the LED is always on, GO to Q2

Q2 CHECK THE LED (LIGHT EMITTING DIODE) CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect PAM C9071A.
- Ignition ON.
Does the LED continue to illuminate?

Yes REPAIR the circuit.

No GO to Q7

Q3 CHECK THE LED (LIGHT EMITTING DIODE) CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect PAM C9071A.

Disconnect driver multifunction switch C2035.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2035-11	Courtesy of FORD MOTOR COMPANY	C9071A-4

Is the resistance less than 3 ohms?

Yes

GO to Q5

No	REPAIR the circuit.

Q4 CHECK THE LED (LIGHT EMITTING DIODE) CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

Disconnect PAM C9071A.

Disconnect driver multifunction switch C2035.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2035-11	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to Q5

No	REPAIR the circuit.

Q5 CHECK THE LED (LIGHT EMITTING DIODE) WITH THE PAM (PARKING ASSIST CONTROL MODULE) BYPASSED

Connect driver multifunction switch C2035.

Connect a fused jumper wire:

Positive Lead	Measurement / Action	Negative Lead
C9071A-4	Courtesy of FORD MOTOR COMPANY	Battery positive

Does the LED illuminate?

Yes	REMOVE the fused jumper wire. GO to Q7

GO to Q6

Q6 CHECK THE AUTO-START-STOP-DEACTIVATION SWITCH GROUND

Disconnect driver multifunction switch C2035.

Measure

Positive Lead	Measurement / Action	Negative Lead
C2035-12	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes	INSTALL a new auto-start-stop-deactivation switch.

No	REPAIR the circuit.

Q7 CHECK FOR CORRECT PAM (PARKING ASSIST CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all PAM 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 PAM 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 service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new PAM. INSTALL a new PAM

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.