WARNING/INDICATION/ALARM [ELECTRONICALLY CONTROLLED BRAKE SYSTEM (E)]

id0420000033x4


Brake System/ABS Warning Light


Purpose/function

•  The brake system warning light turns on to alert the driver if the brake system has a malfunction.
•  The ABS warning light turns on to alert the driver if the ABS has a malfunction.


Construction

•  The brake system warning light and ABS warning light are built into the instrument cluster.
am3zzn00009273


Operation

Note
•  If the electronically controlled brake system and CAN lines are normal, the brake system warning light and ABS warning light turn on when the ignition 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:
―  ABS control disabled
ABS warning light and brake system warning light turned on:
―  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.
Brake system warning light
•  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).

am3zzn00009153
ABS warning light
•  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).
am3zzn00009154

Autohold Active Indicator Light


Purpose/function

•  The AUTOHOLD active indicator light, built into the instrument cluster, notify the driver that the AUTOHOLD is operating.
am3zzn00009155


Construction/operation

•  The AUTOHOLD active indicator light is built into the instrument cluster.
•  When the electronically controlled brake unit operates the AUTOHOLD, it sends the AUTOHOLD active indicator light request signal. When the instrument cluster receives the AUTOHOLD active indicator light request signal from the electronically controlled brake unit, the microcomputer turns the transistor on and a ground circuit with the AUTOHOLD active indicator light is established. Therefore, the AUTOHOLD active indicator light illuminates.
am3zzn00009156


TCS/DSC Indicator Light


Purpose/function

•  The TCS/DSC indicator light, built into the instrument cluster, informs the driver of the following vehicle conditions.
―  TCS is operating. (Drive wheel is slipping.)
―  DSC is operating. (Vehicle side-slip condition.)
―  Electronically controlled brake system malfunction.
ac5uun00002893


Operation

1.  The instrument cluster receives (1) the system condition display 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 condition display request signal.

•  When the electronically controlled brake system and CAN lines are normal, the TCS/DSC indicator light illuminates for approx. 3.0 s when the ignition is switched to ON to check the light function. When the system is malfunctioning, the TCS/DSC indicator light remains illuminated.
•  When the TCS, DSC or are non-operational, operational and malfunctioning, the TCS/DSC indicator light operates according to the following table.

TCS/DSC indicator light operation

Item

TCS/DSC indicator light
TCS and DSC not operating
Not illuminated
TCS operating
Flashes (0.5 s intervals)
DSC operating
Electronically controlled brake system malfunction
Illuminated

am3zzn00009157

DSC OFF Switch, DSC OFF Indicator Light


Purpose

•  The DSC OFF switch allows for optionally enabling/disabling the TCS/DSC control at the driver's discretion.
•  The DSC OFF indicator light notifies the driver that TCS/DSC control has been disabled by operation of the DSC OFF switch.


Function

•  The DSC OFF switch sends a switch operation signal to the instrument cluster.
•  The instrument cluster turns on the DSC OFF indicator light based on the system condition display request signal sent via CAN communication from the electronically controlled brake unit.
•  When the electronically controlled brake system and CAN lines are functioning normally, the DSC OFF indicator light turns on for approx. 3 s when the ignition is switched ON.
•  When the DSC OFF switch is pressed to disable the TCS/DSC control, the DSC OFF indicator light turns on.
•  The DSC OFF indicator light illumination and TCS/DSC control conditions while operating the DSC OFF switch are as indicated in the table.

Mode

DSC OFF indicator light illumination conditions

TCS control conditions

DSC control conditions

Brake control

Engine control

Brake control

Engine control
TCS/DSC ON
Not illuminated
Permitted
Permitted
Permitted
Permitted
TCS/DSC OFF
Illuminated
Inhibited*1*2/permitted*3
Inhibited
Inhibited
Inhibited

*1  :No difference in wheel speed on front left/right wheels
*2  :Difference in wheel speed on front left/right wheels (vehicle speed 35 km/h {22 mph} or more)
*3  :Difference in wheel speed on front left/right wheels (vehicle speed less than 35 km/h {22 mph})


Construction

•  The DSC OFF switch is located on the dashboard (cluster switch).
•  The DSC OFF indicator light is built into the instrument cluster.
am3zzn00009158


Operation

DSC OFF switch
1.  When the DSC OFF switch is operated, a switch operation signal is sent (1) to the instrument cluster.
2.  Based on the switch operation signal (LIN), the instrument cluster sends (2) the DSC OFF switch operation signal to the electronically controlled brake unit via CAN communication.
3.  The electronically controlled brake unit switches (3) the TCS/DSC ON/OFF when it receives the DSC OFF switch operation signal from the instrument cluster.
am3zzn00009159
DSC OFF indicator
1.  The instrument cluster receives (1) the system conditions display request signal from the electronically controlled brake unit via CAN communication.
2.  The instrument cluster turns the transistor on (2) based on the system condition display request signal.
3.  When the transistor turns on, the DSC OFF indicator light turns on (3).
am3zzn00009160


Autohold Warning Beep


Purpose/function

•  Notifies the driver that the brake pedal is not depressed to prevent a mis-operation or accident.


Construction/operation

•  If there is a problem with the AUTOHOLD function and the electric parking brake while AUTOHOLD is operating without depressing brake pedal, the AUTOHOLD warning beep sounds.
•  The AUTOHOLD warning beep is activated using the buzzer built into the BCM.
•  The BCM receives (1) the AUTOHOLD warning beep request signal from the electronically controlled brake unit.
•  The BCM turns the transistor on (2) based on the AUTOHOLD warning beep request signal.
•  When the transistor turns on, a ground circuit with the buzzer built into the BCM is established and the warning beep sounds (3).
•  When the driver operates the brake pedal and the brake fluid pressure is the specification or more, the AUTOHOLD warning beep stops.
am3zzn00009161