Warning Devices: Overview Mercury Milan I

The warning chime sounds to remind the driver

1. to turn the headlamps off when exiting the vehicle.
2. to remove the ignition key when exiting the vehicle.
3. to close the doors after starting the vehicle.
4. to fasten the safety belt after starting the vehicle.
5. to turn off the turn signal.
6. to disengage the parking brake.
7. that a fault is present in the airbag warning indicator circuit.

The instrument cluster controls the warning chime function using various inputs to determine when to sound the warning chime. The warning chime sounds if

1. the headlamps are on with the key removed from the ignition lock cylinder and the driver door ajar.
2. the key is in the ignition lock cylinder in the OFF or ACC position and the driver door ajar.
3. a door is ajar and the ignition key is in the ON position.
4. the safety belts are not fastened and the ignition key is in the ON position.
5. the turn signal is on for more than 3.2 km (2.0 miles).
6. the parking brake is engaged and the vehicle is moving at a speed higher than 5 km/h (3 mph).
7. the ignition switch is in the ON position, the air bag warning indicator is faulted, and an air bag warning chime request is received from the restraints control module (RCM).

Audible signals are also provided to confirm operation of the following vehicle systems

1. Turn signal
2. Hazard signal

Special Tools Illustration Tool Name Tool Number 73III Automotive Meter 105-R0057 or equivalent Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool Flex Probe Kit 105-R025C or equivalent

Scheme 1

Scheme 2

Principles of Operation

The instrument cluster uses different types of sounds to alert the driver of various vehicle conditions as follows

1. Safety belt warning (repetitive chime)
2. Safety belt minder warning (repetitive chime after a delay and after the safety belt chime is completed)
3. Key-in-ignition warning (repetitive chime)
4. Headlamps on warning (repetitive chime)
5. Door ajar warning (single tone chime)
6. Turn signal on warning (repetitive chime after 3.2 km [2.0 miles])
7. Turn signal tone (tic-tock chime)
8. Parking brake warning (repetitive chime)
9. Air bag secondary warning chime (repetitive chime)

Normal Operation

When the key is inserted into the ignition cylinder, the key-in-ignition warning switch (part of the ignition switch) closes circuit CDC30 (BU/GY) to the instrument cluster, providing a voltage signal. The voltage input signals the instrument cluster that the key is inserted. Door ajar status is communicated to the instrument cluster from the smart junction box (SJB) through the controller area network (CAN). If the instrument cluster detects that the ignition lock cylinder is in the OFF or ACC position, the key is inserted in the ignition cylinder, and the SJB communicates to the instrument cluster that the driver door is ajar, the key-in-ignition warning chime sounds.

DTC B1352 - is a continuous DTC that sets if the instrument cluster does not sense voltage applied on circuit CDC30 (BU/GY) with voltage applied to circuit CBP23 (BN/YE) or CBP20 (YE/VT).

Possible Causes

1. Circuit CDC30 (BU/GY) open or short to ground
2. Key-in-ignition warning switch (part of the ignition switch)
3. Instrument cluster

The headlamps on warning chime sounds when the driver door is opened with the ignition lock cylinder in the OFF position, the key not in the ignition lock cylinder, and the headlamp switch in the PARK or HEADLAMP positions. The smart junction box (SJB) communicates to the instrument cluster when the exterior lamps are on and the driver door is opened. The autolamps feature must not be selected for the headlamps on warning chime to operate.

Possible Causes

1. Instrument cluster

The turn signal on warning chime sounds when the vehicle travels more than 3.2 km (2.0 miles) with the turn signal on. The smart junction box (SJB) communicates the turn signal switch status to the instrument cluster over the controller area network (CAN). The powertrain control module (PCM) communicates the odometer count data to the instrument cluster over the CAN.

Possible Causes

1. Instrument cluster

When the key is inserted into the ignition lock cylinder, the key-in-ignition warning switch (part of the ignition switch) closes circuit CDC30 (BU/GY) to the instrument cluster, providing a voltage signal. The voltage input signals the instrument cluster that the key is inserted. Door ajar status is communicated to the instrument cluster from the smart junction box (SJB) through the controller area network (CAN). If the instrument cluster detects that the ignition lock cylinder is in the OFF or ACC position, the key is inserted in the ignition lock cylinder, and the SJB communicates to the instrument cluster that the driver door is ajar, the key-in-ignition warning chime sounds. The SJB communicates to the instrument cluster that the exterior lamps are on and the driver door is opened. The headlamps on warning chime sounds when the driver door is opened with the ignition lock cylinder in the OFF position, the key not in the ignition lock cylinder, and the multifunction switch in the PARKING LAMP or HEADLAMP positions.

Possible Causes

1. Circuit CDC30 (BU/GY) short to voltage
2. Key-in-ignition warning switch (part of the ignition switch)
3. Instrument cluster