WARNING/INDICATION/ALARM [(E)]
id0419007026x2
Brake System Warning light/ABS Warning Light
Purpose, Function
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• The brake warning light is built into the instrument cluster, and if a malfunction occurs in the system, the light turns on to warn the driver of the malfunction.
• The ABS warning light turns on to alert the driver if the ABS has a malfunction.
Construction
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• The brake system warning light and ABS warning light are built into the instrument cluster.
Operation
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Note
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• If the electronically controlled brake system and CAN lines are normal, the brake system warning light/ABS warning light turns on when the main power is switched ON, and turns off after approx. 3 s to check for bulb burn-out. At this time, the brake system warning light remains turned on while the parking brake is applied. However, the light turns off when the parking brake is released.
• The electronically controlled brake unit disables the following controls if there is a system malfunction and the brake system warning light and ABS warning light turn on.
ABS warning light turned on:
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― ABS control disabled
ABS warning light and brake warning light turned on:
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― ABS control and EBD control disabled
• A warning message is indicated on the center display when the ABS warning light is turned on. For the message content and verification method, refer to the [CENTER DISPLAY] in the workshop manual.
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Brake system warning light
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• The instrument cluster receives (1) a system malfunction indication request signal from the electronically controlled brake unit via CAN communication.
• The instrument cluster turns the transistor on (2) based on the system malfunction indication request signal.
• When the transistor turns on, the brake system warning light turns on (3).
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ABS warning light
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• The instrument cluster receives (1) a system malfunction indication request signal from the electronically controlled brake unit via CAN communication.
• The instrument cluster turns the transistor on (2) based on the system malfunction indication request signal.
• When the transistor turns on, the ABS warning light turns on (3).
AUTOHOLD Operation Indicator Light
Purpose, function
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• The AUTOHOLD operation indicator light notifies the driver that the AUTOHOLD is operating.
Construction, Operation
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• The AUTOHOLD operation indicator light is built into the instrument cluster.
• When the AUTOHOLD turns on, the electronically controlled brake unit sends an AUTOHOLD operation indicator light on request signal to the instrument cluster. When the instrument cluster receives the AUTOHOLD on request signal, the microcomputer in the instrument cluster turns the transistor on and the AUTOHOLD operation indicator light turns on.
TCS/DSC Operation Indicator Light
Purpose, Function
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• The TCS/DSC operation indicator light is built into the instrument cluster and notifies the driver that the vehicle is under the following conditions.
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― TCS is operating. (Drive wheel is spinning)
― DSC is operating. (Vehicle is skidding)
― Electronically controlled brake system is malfunctioning.
Operation
1. The instrument cluster receives (1) a system status indication request signal from the electronically controlled brake unit via CAN communication.
2. The instrument cluster turns the transistor on, or turns it on intermittently (2) based on the system status indication request signal.
3. When the transistor turns on, the brake system warning light/ABS warning light turns on or flashes (3).
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• If the electronically controlled brake system and CAN lines are normal, the TCS/DSC operation indicator light turns on when the main power is switched ON, and turns off after approx. 3 s to check for open circuits in the lights. When the system is malfunctioning, the TCS/DSC operation indicator light remains turned on.
• When the TCS/DSC function is operating, malfunctioning, or not operating, the TCS/DSC operation indicator light operates as follows.
TCS/DSC operation indicator light operation table
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Item
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TCS/DSC operation indicator light
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TCS, DSC not operating
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OFF
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TCS is operating
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Flash (0.5 s intervals)
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DSC is operating
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Electronically controlled brake system is malfunctioning
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ON
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TCS OFF Switch, TCS OFF Indicator Light
Purpose
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• The TCS OFF switch allows for optionally enabling/disabling the DSC/TCS control at the driver's discretion.
• The TCS OFF indicator light notifies the driver that TCS control has been disabled by operation of the TCS OFF switch.
Function
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• The TCS OFF switch sends a switch operation signal to the instrument cluster.
• The instrument cluster turns on the TCS OFF indicator light based on the system status indication request signal sent from the electronically controlled brake unit via CAN communication.
• The TCS OFF indicator light illumination and TCS/DSC control conditions while operating the TCS OFF switch are as indicated in the table.
• If the electronically controlled brake system and CAN lines are normal, the TCS/OFF indicator light turns on when the main power is switched ON, and turns off after approx. 3 s.
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Note
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• When the TCS OFF switch is pressed to disable the DSC/TCS control, the TCS OFF indicator light turns on.
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• The TCS OFF indicator light illumination and TCS/DSC control conditions while operating the TCS OFF switch are as indicated in the table.
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Status
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TCS OFF indicator light illumination status
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TCS control conditions
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DSC control conditions
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Brake control
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Electric motor control
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TCS/DSC on
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OFF
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Permit
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Permit
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Permit
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TCS/DSC off
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ON
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Permit
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Inhibit
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Inhibit
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Construction
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• The TCS OFF switch is located on the dashboard (cluster switch).
• The TCS OFF indicator light is built into the instrument cluster.
Operation
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TCS OFF switch
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1. When the TCS OFF switch is operated, a switch operation signal is sent (1) to the instrument cluster via LIN communication.
2. Based on the switch operation signal, the instrument cluster sends (2) a TCS OFF switch operation signal to the electronically controlled brake unit via CAN communication.
3. When the electronically controlled brake unit receives the TCS OFF switch operation signal from the instrument cluster, it switches (3) the TCS on/off.
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TCS OFF indicator light
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1. The instrument cluster receives (1) a system status indication request signal from the electronically controlled brake unit via CAN communication.
2. The instrument cluster turns the transistor on (2) based on the system status indication request signal.
3. When the transistor turns on, the TCS OFF indicator light turns on (3).
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Note
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• If the electronically controlled brake system and CAN lines are normal, the TCS/OFF indicator light turns on when the main power is switched ON, and turns off after approx. 3 s.
• When the TCS OFF switch is pressed to disable the TCS control, the TCS OFF indicator light turns on.
Autohold Warning Beep
Purpose, function
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• When there is a malfunction in the vehicle and the AUTOHOLD is disabled, a sound is activated to promote the driver to depress the brake pedal.
Construction, Operation
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• When the AUTOHOLD is operating or there is a malfunction in the electric parking brake, the AUTOHOLD warning beep is activated.
• The AUTOHOLD warning beep is activated by the notification and warning speaker.
• The electronically controlled brake unit sends (1) an AUTOHOLD warning beep request signal to the BCM via CAN communication.
• When the BCM receives the AUTOHOLD warning beep request signal, the AUTOHOLD warning beep is activated (2) from the notification and warning speaker.
• When the driver depresses the brake pedal and the brake fluid pressure is the specification or more, the AUTOHOLD warning beep turns off.
