Pinpoint Test C: DTC P254F:00

Anti-Theft

Pinpoint Test C: DTC P254F:00

Refer to Wiring Diagram Set 117, Remote Keyless Entry and Alarm for schematic and connector information. Diagrams By Number

When the alarm system is armed, the Body Control Module (BCM) monitors the hood ajar switch. If the hood is opened while the alarm is armed, the hood ajar switch removes ground from the signal circuit. This signals the BCM that an unauthorized intrusion to the engine compartment has occurred and the perimeter alarm is activated.

- DTC P254F:00 (Engine Hood Switch Circuit / Open: No Sub Type Information) - an on-demand DTC that sets when the BCM detects an open in the hood switch circuit during the self-test. This DTC sets if the hood is open during a self-test

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Hood switch
- BCM

PINPOINT TEST C: DTC P254F:00

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

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C1 CHECK THE HOOD SWITCH

- Disconnect: Hood Switch C127.
- Connect a fused jumper wire between the hood switch C127-2, circuit CPL25 (BU/OG), harness side and the hood switch C127-1, circuit GD187 (BK/GN), harness side.




- Clear the BCM DTCs.
- Repeat the BCM self-test.
- Is the BCM DTC P254F:00 retrieved?

Yes
REMOVE the jumper wire. GO to C2.

No
REMOVE the jumper wire. INSTALL a new hood latch. REFER to Handles, Locks, Latches and Entry Systems Hood Latch. TEST the system for normal operation.

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C2 CHECK THE HOOD SWITCH GROUND CIRCUIT

- Connect a fused jumper wire between the hood switch C127-2, circuit CPL25 (BU/OG), harness side and ground.




- Clear the BCM DTCs.
- Repeat the BCM self-test.
- Is the BCM DTC P254F:00 retrieved?

Yes
GO to C3.

No
REPAIR circuit GD187 (BK/GN) for an open. TEST the system for normal operation.

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C3 CHECK THE HOOD SWITCH SIGNAL CIRCUIT FOR AN OPEN

- Ignition OFF.
- Disconnect: BCM C2280D.
- Measure the resistance between the hood switch C127-2, circuit CPL25 (BU/OG), harness side and the BCM C2280D-12, circuit CPL25 (BU/OG), harness side.




- Is the resistance less than 5 ohms?

Yes
GO to C4.

No
REPAIR circuit CPL25 (BU/OG) for an open. CLEAR the DTCs. REPEAT the self-test.

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C4 CHECK FOR CORRECT BCM OPERATION

- Disconnect all the BCM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the BCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new BCM. REFER to Multifunction Electronic Modules Body Control Module (BCM). TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

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