Pinpoint Test D : B1A01:12, B1A01:13, B1A02:12, B1A02:13

Refer to Vehicle Emergency Messaging System for schematic and connector information.

Normal Operation and Fault Conditions

The PACM controls the front and rear 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 B1A01:12	Speaker #1: Circuit Short To Battery	An on-demand DTC that sets when the PACM detects the front sounder signal or return circuits are shorted to voltage.
PACM B1A01:13	Speaker #1: Circuit Open	An on-demand DTC that sets when the PACM detects the front sounder signal or return circuit is open.
PACM B1A02:12	Speaker #2: Circuit Short To Battery	An on-demand DTC that sets when the PACM detects the rear sounder signal or return circuits are shorted to voltage.
PACM B1A02:13	Speaker #2: Circuit Open	An on-demand DTC that sets when the PACM detects the rear sounder signal or return circuit is open.

Possible Sources

Wiring, terminals or connectors
Front sounder
Rear 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

D1 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 B1A01:12 or B1A02:12 recorded?

Yes GO to D2

No GO to D4

D2 CHECK FOR A SHORT TO VOLTAGE AT THE SOUNDER

Ignition OFF.

Disconnect PACM C4525.

Ignition ON.

Measure:

Front Sounder (DTC B1A01:12)

Lead 1	Measurement / Action	Lead 2
C4525-9	Courtesy of FORD MOTOR COMPANY	Ground

Rear Sounder (DTC B1A02:12)

Lead 1	Measurement / Action	Lead 2
C4525-11	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes

GO to D3

GO to D7

D3 CHECK FOR A SHORT TO VOLTAGE WITH THE SOUNDER DISCONNECTED

Ignition OFF.

Disconnect Front Sounder C1945 (DTC B1A01:12).

Disconnect Rear Sounder C4526 (DTC B1A02:12).

Measure:

Front Sounder (DTC B1A01:12)

Lead 1	Measurement / Action	Lead 2
C4525-9	Courtesy of FORD MOTOR COMPANY	Ground

Rear Sounder (DTC B1A02:12)

Lead 1	Measurement / Action	Lead 2
C4525-11	Courtesy of FORD MOTOR COMPANY	Ground

Ignition ON.

Is any voltage present?

Yes	REPAIR the signal circuit.

No	REPAIR the return circuit.

D4 CHECK THE SOUNDER FOR AN OPEN

Ignition OFF.

Disconnect Front Sounder C1945 (DTC B1A01:13).

Disconnect Rear Sounder C4526 (DTC B1A02:13).

Connect a fused jumper wire:

Front Sounder (DTC B1A01:13)

Lead 1	Measurement / Action	Lead 2
C1945-1	Courtesy of FORD MOTOR COMPANY	C1945-2

Rear Sounder (DTC B1A02:13)

Lead 1	Measurement / Action	Lead 2
C4526-1	Courtesy of FORD MOTOR COMPANY	C4526-2

Ignition ON.

Using a diagnostic scan tool, perform the PACM module self-test.

NOTE: DTC B1A01:13 or B1A02:13 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 B1A01:11 or B1A02:11 recorded?

Yes	REMOVE the fused jumper wire. REFER to: Pedestrian Alert System Speaker .

No	REMOVE the fused jumper wire. GO to D5

D5 CHECK THE SOUNDER SIGNAL CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect PACM C4525.

Measure:

Front Sounder (DTC B1A01:13)

Lead 1	Measurement / Action	Lead 2
C4525-9	Courtesy of FORD MOTOR COMPANY	C1945-1

Rear Sounder (DTC B1A02:13)

Lead 1	Measurement / Action	Lead 2
C4525-11	Courtesy of FORD MOTOR COMPANY	C4526-1

Is the resistance less than 3 ohms?

Yes

GO to D6

No	REPAIR the circuit in question.

D6 CHECK THE SOUNDER RETURN CIRCUIT FOR AN OPEN

Measure:

Front Sounder (DTC B1A01:13)

Lead 1	Measurement / Action	Lead 2
C4525-8	Courtesy of FORD MOTOR COMPANY	C1945-2

Rear Sounder (DTC B1A02:13)

Lead 1	Measurement / Action	Lead 2
C4525-10	Courtesy of FORD MOTOR COMPANY	C4526-2

Is the resistance less than 3 ohms?

Yes

GO to D7

No	REPAIR the circuit in question.

D7 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.