Pinpoint Test D : DTC P166B

WARNING: This page is about a different variant/trim than selected.

Refer to Shift Interlock for schematic and connector information. Refer to Remote Keyless Entry and Alarm for schematic and connector information.

Normal Operation and Fault Conditions

The GSM uses the drivers door unlock switch input and drivers door status input as checks before it forces the transmission into the park position when the operator is preparing to exit the vehicle.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
GSM P166B:00	Drivers Door Status Correlation: No Sub Type Information	The GSM monitors the voltage signals on the door status and door unlock switch inputs. If these inputs fail a rational test between them, the DTC sets.

Possible Sources

Connectors damaged or pushed-out terminals, circuitry open, shorted to power or shorted to ground
Driver door lock/unlock switch
Driver door ajar switch
GSM

D1 RUN GSM SELF-TEST AND RETRIEVE AND RECORD ALL DTCS

NOTE: If a GSM self-test is performed, the driver door must be closed and locked. A false P166B and/or P081F DTC sets if the driver door is opened or unlocked during the self-test.
- Using the diagnostic scan tool, run the GSM self-test and retrieve all DTCs.
Is DTC P166B present?

Yes GO to D2

No The system is operating correctly at this time.

D2 MONITOR THE DOOR UNLOCK/LOCK PID
- Using the diagnostic scan tool, monitor the GSM PID, DR_UNLCK_HWI while locking and unlocking the driver's door.
Does the PID toggle while locking and unlocking the driver's door?

Yes GO to D5

No GO to D3

D3 CHECK THE DOOR UNLOCK CIRCUIT FOR AN OPEN

Disconnect GSM C3532.

Disconnect Front Door Latch Release Motor LH C525.

Inspect the connectors for damaged or pushed-out terminals.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3532-4	Courtesy of FORD MOTOR COMPANY	C525-4

Is the resistance less than 3 ohms?

Yes

GO to D4

No	REPAIR the circuit.

D4 CHECK THE DOOR UNLOCK CIRCUIT FOR A SHORT TO GROUND

Measure:

Positive Lead	Measurement / Action	Negative Lead
C525-4	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to D5

No	REPAIR the circuit.

D5 CHECK THE DOOR STATUS CIRCUIT FOR AN OPEN

Disconnect GSM C3532.

Disconnect BCM C2280D.

Disconnect Front Door Latch Release Motor LH C525.

Inspect the connectors for damaged or pushed-out terminals.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3532-15	Courtesy of FORD MOTOR COMPANY	C525-3

Is the resistance less than 3 ohms?

Yes

GO to D6

No	REPAIR the circuit.

D6 CHECK THE DOOR STATUS CIRCUIT FOR A SHORT TO GROUND

Measure:

Positive Lead	Measurement / Action	Negative Lead
C525-3	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to D7

No	REPAIR the circuit.

D7 CHECK THE DOOR UNLOCK CIRCUIT AND DOOR STATUS CIRCUITS FOR A SHORT TO POWER

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C525-3	Courtesy of FORD MOTOR COMPANY	Ground
C525-4	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit.

GO to D8

D8 VERIFY THE GSM FAULT

NOTE: If a GSM self-test is performed, the driver door must be closed and locked. A false P166B and/or P081F DTC sets if the driver door is opened or unlocked during the self-test.
- Connect BCM C2280D.
- Connect Front Door Latch Release Motor LH C525.
- Connect GSM C3532.
- Using the diagnostic scan tool, run the GSM self-test and retrieve all DTCs.
Is the condition still present?

Yes INSTALL a new GSM. REFER to: Gear Shift Module (GSM) .

No The system is operating correctly at this time.