Pinpoint Test C: B1A01:01, B1A01:11

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 WARNING DEVICES for schematic and connector information.

Normal Operation and Fault Conditions

The PACM controls the front sounder output on hardwired circuitry and sets Diagnostic Trouble Codes (DTCs) when a circuit or sounder fault is detected.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PACM B1A01:01	Speaker #1: General Electrical Failure	An on-demand DTC that sets when the PACM detects the front sounder signal and return circuits are shorted together.
PACM B1A01:11	Speaker #1: Circuit Short To Ground	An on-demand DTC that sets when the PACM detects the front sounder signal or return circuit is shorted to ground.

Possible Sources

Wiring, terminals or connectors
Front sounder
PACM

Visual Inspection and Pre-checks

Inspect the sounder connector for corrosion (install new connector or terminals - clean module pins)
Inspect the sounder connector for damaged or bent pins - install new terminals/pins
Inspect the sounder connector for pushed-out pins - install new pins as necessary

C1 PERFORM THE PACM (PEDESTRIAN ALERT CONTROL MODULE) MODULE SELF-TEST
- Ignition ON.
- Using a diagnostic scan tool, perform the PACM module self-test.
- Check for recorded Diagnostic Trouble Codes (DTCs) from the PACM module self-test.
Is DTC B1A01:01 recorded?

Yes GO to C2

No GO to C4

C2 CHECK THE SOUNDER FOR AN INTERNAL SHORT
- Ignition OFF.
- Disconnect Sounder C1945.
- Ignition ON.
- Using a diagnostic scan tool, perform the PACM module self-test.
- NOTE: DTC B1A01:01 can also be present when carrying out this step and should be disregarded at this time.
  
  Check for recorded Diagnostic Trouble Codes (DTCs) from the PACM module self-test.
Is DTC B1A01:13 recorded?

Yes INSTALL a new sounder. REFER to: Pedestrian Alert System Speaker . .

No GO to C3

C3 CHECK THE SOUNDER SIGNAL AND RETURN CIRCUIT FOR A SHORT TOGETHER

Ignition OFF.

Disconnect PACM C2828.

Measure:

Lead 1	Measurement / Action	Lead 2
C2828-9	Courtesy of FORD MOTOR COMPANY	C2828-8

Is the resistance greater than 10, 000 ohms?

Yes

GO to C6

No	REPAIR the circuits.

C4 CHECK THE SOUNDER SIGNAL CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

Disconnect PACM C2828.

Disconnect Sounder C1945 (DTC B1A01:11).

Measure:

Lead 1	Measurement / Action	Lead 2
C2828-9	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to C5

No	REPAIR the circuit.

C5 CHECK THE SOUNDER RETURN CIRCUIT FOR A SHORT TO GROUND

Measure:

Lead 1	Measurement / Action	Lead 2
C2828-8	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to C6

No	REPAIR the circuit.

C6 CHECK FOR CORRECT PACM (PEDESTRIAN ALERT CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect the PACM and connector.

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 PACM connector. Make sure it seats and latches 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 PACM. REFER to: Pedestrian Alert Control Module (PACM) .

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.