Part 2
Instrumentation, Message Center and Warning Chimes
Principles of Operation
Door Ajar Warning Chime
The door ajar warning chime warns that a door is ajar. The door ajar warning chime is a single chime with a 1 second duration. The door ajar chime sounds when the driver or passenger door, liftgate or liftgate glass becomes ajar while the ignition switch is in the RUN position.
The door ajar warning chime inputs are the:
- Ignition state
- Door ajar, hood or luggage compartment lid message from the SJB (Smart Junction Box)
Forward Collision Warning Chime
The forward collision warning chime warns that a forward collision potential has been detected or if the Head Up Display (HUD) module detects a forward collision warning system concern. Once the forward collision system detects a possible forward collision, the HUD (Head Up Display) module flashes, the forward collision warning chime sounds and the audio system is muted.
The forward collision warning system also provides a confirmation chime to inform the driver that the forward collision system configuration (chime or system on/off) has been changed.
The forward collision warning system and chime can be configured off using the message center switch. Refer to Collision Avoidance for additional information. When a MyKey(R) key is in use, the driver cannot configure the forward collision warning system or chime off. Refer to Antitheft and Alarm Systems for more information on the MyKey(R) feature.
The forward collision warning chime inputs are:
- Ignition state.
- Forward collision warning alert chime command communicated by the HUD (Head Up Display) module through the HS-CAN (High Speed Controller Area Network).
- Forward collision warning confirmation chime command communicated by the HUD (Head Up Display) module through the HS-CAN (High Speed Controller Area Network).
Headlamps On Warning Chime
The headlamps on warning chime warns that the headlamps are on when the driver door is ajar and the key is removed from the ignition lock cylinder. The headlamps on warning chime sounds if the driver door is ajar and the headlamp switch is in the PARKING LAMP or HEADLAMP position with the ignition is in the OFF mode and the key out (non-Intelligent Access (IA) vehicles only).
The headlamps on warning chime stops sounding when any one of the above conditions are removed.
The headlamps on warning chime inputs are:
- Ignition state to the SJB (Smart Junction Box).
- Key-in-ignition switch position to the SJB (Smart Junction Box).
- Door ajar input from the driver door ajar switch to the SJB (Smart Junction Box).
- Headlamp switch input to the SJB (Smart Junction Box).
- Headlamps on chime request communicated by the SJB (Smart Junction Box) to the IPC (Instrument Panel Cluster) through the MS-CAN (Medium Speed Controller Area Network).
Key-In-Ignition Warning Chime (Non-IA (Intelligent Access) Equipped Vehicles)
The key-in-ignition warning chime warns that the key is still in the ignition lock cylinder when the driver door is ajar. The key-in-ignition warning chime sounds when the driver door is ajar, the key is in the ignition lock cylinder and in the OFF/LOCK or ACC position.
The key-in-ignition warning chime stops sounding when the driver door is closed, the key is removed from the ignition lock cylinder, or if the ignition switch is turned to the ON position.
The key-in-ignition warning chime inputs are:
- Ignition state.
- Key-in-ignition switch position to the SJB (Smart Junction Box).
- Door ajar input from the driver door ajar switch to the SJB (Smart Junction Box).
- Key-in-ignition chime request communicated by the SJB (Smart Junction Box) to the IPC (Instrument Panel Cluster) through the MS-CAN (Medium Speed Controller Area Network).
Key-In-Ignition Warning Chime (IA (Intelligent Access) Equipped Vehicles)
The key-in-ignition warning chime warns that the ignition is in the ACC mode and the driver door is ajar. The Remote Function Actuator (RFA) module monitors the ignition mode and door ajar status then provides an implied key-in-ignition state to the SJB (Smart Junction Box). The SJB (Smart Junction Box) then sends a key-in-ignition chime request to the IPC (Instrument Panel Cluster) over the MS-CAN (Medium Speed Controller Area Network).
The key-in-ignition warning chime inputs are:
- Ignition state.
- Implied key-in-ignition signal to the SJB (Smart Junction Box) from the RFA (Remote Function Actuator) module.
- Key-in-ignition chime request communicated by the SJB (Smart Junction Box) to the IPC (Instrument Panel Cluster) through the MS-CAN (Medium Speed Controller Area Network).
The RFA (Remote Function Actuator) module uses a Field-Effect Transistor (FET) protective circuit strategy for the key-in-ignition output to the SJB (Smart Junction Box). An FET (Field-Effect Transistor) is a type of transistor that when used with module software can be used to monitor and control current flow on module outputs. The FET (Field-Effect Transistor) protection strategy is used to prevent module damage in the event of excessive current flow.
Output loads (current level) are monitored for excessive current (typically short circuits) and are shut down (turns off the voltage or ground provided by the module) when a fault event is detected. A continuous DTC is stored at the fault event and a cumulative counter is started.
When the demand for the output is no longer present, the module resets the FET (Field-Effect Transistor) circuit protection to allow the circuit to function. The next time the driver requests a circuit to activate that has been shut down by a previous short (FET (Field-Effect Transistor) protection) and the circuit remains shorted, the FET (Field-Effect Transistor) protection shuts off the circuit again and the cumulative counter advances.
When the excessive circuit load occurs often enough, the module shuts down the output until a repair procedure is carried out. Each FET (Field-Effect Transistor) protected circuit has 3 predefined levels of short circuit tolerance based on the harmful effect of each circuit fault on the FET (Field-Effect Transistor) and the ability of the FET (Field-Effect Transistor) to withstand it. A module lifetime level of fault events is established based upon the durability of the FET (Field-Effect Transistor). If the total tolerance level is determined to be 600 fault events, the 3 predefined levels would be 200, 400 and 600 fault events.
When each tolerance level is reached, the continuous DTC that was stored on the first failure cannot be cleared by a command to clear the continuous DTCs. The module does not allow this code to be cleared or the circuit restored to normal operation until a successful self-test proves that the fault has been repaired. After the self-test has successfully completed (no on-demand DTCs present), DTC U1000:00 and the associated continuous DTC (the DTC related to the shorted circuit) automatically clears and the circuit function returns.
When the first or second level is reached, the continuous DTC (associated with the short circuit) sets along with DTC U1000:00. These DTCs can be cleared using the module on-demand self-test, then the Clear DTC operation on the scan tool (if the on-demand test shows the fault corrected). The module never resets the fault event counter to zero and continues to advance the fault event counter as short circuit fault events occur.
If the number of short circuit fault events reach the third level, then DTC U1000:00 sets along with the associated continuous DTC. This DTC cannot be cleared and the module must be replaced.
Memory Feedback Feature Chime
The purpose of the memory feedback feature chime is to inform the driver that their preferences have been successfully programmed through the memory set procedure.
The memory feedback chime inputs are:
- Ignition state.
- Memory feedback chime request communicated by the Driver Seat Module (DSM) to the IPC (Instrument Panel Cluster) over the MS-CAN (Medium Speed Controller Area Network).
Message Center Warning Chime
The message center warning chime feature is to draw the driver's attention to the message center display to view a new warning message. The IPC (Instrument Panel Cluster) provides a single 1-second tone whenever a new warning message is displayed in the message center. If multiple warning messages are present, the IPC (Instrument Panel Cluster) sounds a chime for each of the warning messages that are present as they cycle through the message center display.
Parking Brake Warning Chime
The parking brake warning chime warns that the parking brake is engaged when the vehicle is in motion. The parking brake warning chime sounds if the ignition is in RUN mode, the parking brake is engaged, and the vehicle speed is greater than 4.8 km/h (3 mph).
The parking brake warning chime stops sounding if the parking brake is released, the ignition is not in the RUN mode, if the vehicle speed is less than 4.8 km/h (3 mph), or after 90 seconds from the time the chime is activated.
The parking brake warning chime inputs are:
- Ignition state.
- Parking brake switch status communicated by the SJB (Smart Junction Box) to the IPC (Instrument Panel Cluster) through the MS-CAN (Medium Speed Controller Area Network).
- Vehicle speed data communicated by the PCM to the SJB (Smart Junction Box) through the MS-CAN (Medium Speed Controller Area Network).
- Parking brake warning chime request communicated by the SJB (Smart Junction Box) to the IPC (Instrument Panel Cluster).
Perimeter Alarm Warning Chime
The perimeter alarm warning chime is used to alert the driver that the perimeter alarm is armed when the driver door is unlocked with a key. The warning chime is only functional when a key is used to unlock the driver door. If the key fob or keypad (if equipped) is used to unlock the door, the perimeter alarm is disarmed and the warning chime does not sound. The warning chime sounds for 12 seconds when the driver door is opened and turns off when the perimeter alarm is disarmed (either by using the key fob, keypad or turning the key to the ON position). After the 12-second warning chime duration, the warning chime stops sounding and the perimeter alarm activates, sounding the horn and flashing the turn signal lights.
NOTE: The perimeter alarm takes approximately 25 seconds to fully arm once the driver has locked the doors using the key fob or keypad.
The perimeter alarm warning chime inputs are:
- Ignition state.
- Perimeter alarm warning chime request communicated by the Driver Seat Module (DSM) to the IPC (Instrument Panel Cluster) through the MS-CAN (Medium Speed Controller Area Network).
Safety Belt Warning Chime
The safety belt warning chime warns that the safety belt is not fastened. The safety belt warning chime sounds when the driver safety belt is not fastened and the ignition is changed from the OFF or ACC to the RUN or START mode.
The safety belt warning chime stops sounding when the safety belt is fastened, when the ignition is switched from the ON or START mode to the OFF or ACC mode, or when the chime has sounded for approximately 6 seconds.
The safety belt warning chime inputs are:
- Ignition state.
- Driver safety belt warning chime request communicated by the RCM (Restraints Control Module) to the IPC (Instrument Panel Cluster) through the HS-CAN (High Speed Controller Area Network).
Service AdvanceTrac(R) Warning Chime
The service AdvanceTrac(R)warning chime warns that the ABS module has detected a fault condition in the AdvanceTrac(R) system. The SERVICE ADVANCETRAC message is also displayed along with the chime.
The service AdvanceTrac(R) chime sounds for approximately 2 seconds after an initial delay of 8 seconds following key ON. The AdvanceTrac(R) chime stops sounding when the ignition switch is turned from the RUN/START position to the OFF/LOCK or ACC position or when the fault condition is repaired.
The service AdvanceTrac(R) warning chime inputs are:
- Ignition state.
- Service AdvanceTrac(R) warning chime request communicated by the ABS to the IPC (Instrument Panel Cluster) through the HS-CAN (High Speed Controller Area Network).
Turn Signal Left On Warning Chime
The turn signal left on warning chime warns that the turn signal has not been cancelled. The turn signal left on warning chime sounds if the left or right turn signal is on and the vehicle has traveled more than 3.2 km (2.0 miles).
The turn signal left on warning chime stops sounding if the turn signal is turned off or if the ignition is switched to the OFF or ACC mode.
The turn signal left on warning chime inputs are:
- Ignition state to the IPC (Instrument Panel Cluster) and SJB (Smart Junction Box).
- Turn signal on data communicated by the SJB (Smart Junction Box) to the IPC (Instrument Panel Cluster) through the MS-CAN (Medium Speed Controller Area Network) communication.
- Odometer count data communicated by the PCM to the IPC (Instrument Panel Cluster) through the HS-CAN (High Speed Controller Area Network).
Turn/Hazard On Tone
Since the turn/hazard flasher is an electronic function of the SJB (Smart Junction Box), the on/off sound that used to be present with standard bi-metal flashers is no longer present. To provide an audible sound and indicate that the RH/LH turn or hazard indicators are on, the IPC (Instrument Panel Cluster) provides a tick-tock tone along with the visual turn signal indicators.
The turn/hazard on tone inputs are:
- Left turn indicator signal from the SJB (Smart Junction Box) to the IPC (Instrument Panel Cluster) through the MS-CAN (Medium Speed Controller Area Network).
- Right turn indicator signal from the SJB (Smart Junction Box) to the IPC (Instrument Panel Cluster) through the MS-CAN (Medium Speed Controller Area Network).