Pinpoint Tests AP: The Headlamps On Warning Chime Is Inoperative

Instrumentation, Message Center and Warning Chimes


Pinpoint Tests


Pinpoint Test AP: The Headlamps On Warning Chime Is Inoperative

Normal Operation

The Smart Junction Box (SJB) receives the headlamp switch status from the headlamp switch. The SJB receives the LH front door ajar status from the LH front door ajar switch through hardwired circuitry.

The headlamps on warning chime sounds when the LH front door is opened with the ignition switch in the OFF position, no key-in-ignition input, and the headlamp switch is in the PARK or HEADLAMP ON position. The SJB communicates the headlamp on chime request to the Instrument Panel Cluster (IPC) over the Medium Speed Controller Area Network (MS-CAN) communication bus. The autolamps feature must not be selected for the headlamps on warning chime to operate.

This pinpoint test is intended to diagnose the following:

- SJB
- IPC



PINPOINT TEST AP: THE HEADLAMPS ON WARNING CHIME IS INOPERATIVE

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AP1 CARRY OUT THE CHIME FUNCTION ACTIVE COMMAND


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC DataLogger.
- Select the IPC chime command (SOUNDER_OUT).
- Scroll through the chimes to select the Lights On chime.
- Does the chime operate?

Yes
GO to AP2.

No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC). TEST the system for normal operation.

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AP2 CHECK THE SAFETY BELT WARNING CHIME OPERATION


- Ignition OFF.
- Ignition ON.
- Monitor the safety belt warning chime when the ignition switch is transitioned from OFF to RUN for 6 seconds.
- Does the safety belt warning chime operate for approximately 6 seconds?

Yes
GO to AP3.

No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC). TEST the system for normal operation.

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AP3 CHECK THE EXTERIOR LAMPS OPERATION


- Ignition OFF.
- Place the headlamp switch in the PARK position.
- Do the parking lamps operate?

Yes
GO to AP4.

No
REFER to Lighting and Horns. Lighting and Horns

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AP4 CHECK THE COURTESY LAMPS OPERATION


- Ignition ON.
- Open then close the LH front door while observing the courtesy lamps.
- Do the courtesy lamps operate correctly?

Yes
INSTALL a new SJB. TEST the system for normal operation.

No
REFER to Courtesy Lamp. TEST the system for normal operation. Testing and Inspection

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