Pinpoint Test N: The Doors Do Not Lock Or Unlock Using The Keyless Entry Keypad

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 REMOTE KEYLESS ENTRY AND ALARM for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Handles, Locks, Latches and Entry Systems - System Operation and Component Description .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
BCM B121B:01	Keypad Input Switch: General Electrical Failure	Sets when the BCM detects an internal failure with the driver side keypad.

Possible Sources

Wiring, terminals or connectors
Keyless entry keypad
BCM

Visual Inspection and Pre-checks

Inspect the front door window moulding for damage.

N1 CHECK POWER LOCK OPERATION FROM THE DOOR LOCK CONTROL SWITCH
- Press the lock and unlock button on the door lock control switch.
Do the doors lock and unlock?

Yes GO to N2

No REFER to the Symptom Chart: Handles, Locks, Latches and Entry Systems - Electrical .

N2 CHECK FOR BCM (BODY CONTROL MODULE) DTC (DIAGNOSTIC TROUBLE CODE) B121B:01
- Ignition ON.
- Using a diagnostic scan tool, carry out the BCM self-test.
Is DTC B121B:01 present?

Yes GO to N3

No GO to N5

N3 ISOLATE THE KEYLESS ENTRY KEYPAD
- Ignition OFF.
- Disconnect Keyless Entry Keypad C500.
- Ignition ON.
- Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs) and repeat the BCM self-test.
Is DTC B121B:01 still present?

Yes GO to N4

No INSTALL a new keyless entry keypad. REFER to: Keyless Entry Keypad .

N4 CHECK THE KEYLESS ENTRY KEYPAD INPUT CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Disconnect BCM C2280E.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C500-1	Courtesy of FORD MOTOR COMPANY	Ground
C500-3	Courtesy of FORD MOTOR COMPANY	Ground
C500-5	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes

GO to N11

No	REPAIR the circuit in question.

N5 CHECK THE BCM (BODY CONTROL MODULE) KEYPAD CODE
- Using a diagnostic scan tool, view the factory keyless entry code.
- Enter the 5-digit factory set entry code on the keyless entry keypad, then touch the 3/4 button.
- Simultaneously touch the 7/8 and 9/0 buttons for 3 seconds.
Do the doors unlock when the factory code is entered and lock when the 7/8 and 9/0 buttons are pressed?

Yes The system is operating as designed. INFORM the customer of the correct system operation.

No GO to N6

N6 CHECK THE BCM (BODY CONTROL MODULE) KEYPAD PARAMETER IDENTIFICATIONS (PIDS)
- Using a diagnostic scan tool, view the BCM Parameter Identifications (PIDs).
- Press each keyless entry keypad button while observing the following BCM Parameter Identifications (PIDs):
  - Access the BCM and monitor the KYPD_BTN_1/2PID
  - Access the BCM and monitor the KYPD_BTN_3/4PID
  - Access the BCM and monitor the KYPD_BTN_5/6PID
  - Access the BCM and monitor the KYPD_BTN_7/8PID
  - Access the BCM and monitor the KYPD_BTN_9/0PID
Do all of the Parameter Identifications (PIDs) indicate the buttons operate correctly?

Yes GO to N11

No GO to N7

N7 CHECK THE KEYLESS ENTRY KEYPAD GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect Keyless Entry Keypad C500.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C500-6	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to N8

No	REPAIR the circuit.

N8 BYPASS THE KEYLESS ENTRY KEYPAD

Ignition ON.

Using a diagnostic scan tool, monitor the following BCM Parameter Identifications (PIDs):
- Access the BCM and monitor the KYPD_BTN_1/2PID
- Access the BCM and monitor the KYPD_BTN_7/8PID
- Access the BCM and monitor the KYPD_BTN_9/0PID

Connect:

Keypad Button 1/2

Lead 1	Measurement / Action	Lead 2
C500-1	Courtesy of FORD MOTOR COMPANY	C500-6

Remove the fused jumper wire.

Connect:

Keypad Button 7/8

Lead 1	Measurement / Action	Lead 2
C500-3	Courtesy of FORD MOTOR COMPANY	C500-6

Remove the fused jumper wire.

Connect:

Keypad Button 9/0

Lead 1	Measurement / Action	Lead 2
C500-5	Courtesy of FORD MOTOR COMPANY	C500-6

Remove the fused jumper wire.

Do the Parameter Identifications (PIDs) indicate correctly when the jumper wire is connected?

Yes	INSTALL a new keyless entry keypad. REFER to: Keyless Entry Keypad .

GO to N9

N9 CHECK THE KEYLESS ENTRY KEYPAD INPUT CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect BCM C2280E.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C500-1	Courtesy of FORD MOTOR COMPANY	C2280E-28
C500-3	Courtesy of FORD MOTOR COMPANY	C2280E-2
C500-5	Courtesy of FORD MOTOR COMPANY	C2280E-15

Are the resistances less than 3 ohms?

Yes

GO to N10

No	REPAIR the circuit in question.

N10 CHECK THE KEYLESS ENTRY KEYPAD INPUT CIRCUITS FOR A SHORT TO EACH OTHER

Measure:

Positive Lead	Measurement / Action	Negative Lead
C500-1	Courtesy of FORD MOTOR COMPANY	C500-3
C500-1	Courtesy of FORD MOTOR COMPANY	C500-5
C500-3	Courtesy of FORD MOTOR COMPANY	C500-5

Are the resistances greater than 10, 000 ohms?

Yes

GO to N11

No	REPAIR the circuits in question.

N11 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

Disconnect and inspect all the BCM connectors.

Repair:
- corrosion (install new connectors or terminals - clean module pins)
- damaged or bent pins - install new terminals pins
- pushed-out pins - install new pins as necessary

Reconnect the BCM connectors and 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 BCM. REFER to: Body Control Module (BCM) .

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.